Offer to Purchase for Cash
by
EMCORE Corporation
of
Up to $45,000,000 of Shares of Its Common Stock
at a Purchase Price Not Greater than $6.75 per Share
nor Less than $6.25 per Share

EMCORE Corporation, a New Jersey corporation (the "Company," "EMCORE," "we," or "us"), invites its shareholders to tender shares of its common stock, no par value per share (the "Shares"), for purchase by EMCORE at a price not greater than $6.75 per Share nor less than $6.25 per Share, net to the seller in cash, less any applicable withholding taxes and without interest, upon the terms and subject to the conditions described in this offer to purchase (this "Offer to Purchase") and in the related letter of transmittal (the "Letter of Transmittal") (together, this Offer to Purchase and the Letter of Transmittal, as they may be amended or supplemented from time to time, constitute the "Offer").

We are offering to purchase Shares in the Offer up to an aggregate purchase price of $45 million. Upon the terms and subject to the conditions of the Offer, we will determine a single per Share price that we will pay for Shares properly tendered and not properly withdrawn from the Offer, taking into account the total number of Shares properly tendered and the prices specified by tendering shareholders. We will select the lowest purchase price, not greater than $6.75 per Share nor less than $6.25 per Share, that will allow us to purchase Shares having an aggregate purchase price of $45 million, or a lower amount depending on the number of Shares properly tendered and not properly withdrawn (such purchase price, the "Final Purchase Price"). All Shares acquired in the Offer will be acquired at the Final Purchase Price, including those Shares tendered at a price lower than the Final Purchase Price. Only Shares properly tendered at prices at or below the Final Purchase Price, and not properly withdrawn, will be purchased. However, because of the "odd lot" priority, proration and conditional tender provisions described in this Offer to Purchase, we may not purchase all of the Shares tendered at or below the Final Purchase Price if, based on the Final Purchase Price, Shares having an aggregate purchase price in excess of $45 million are properly tendered and not properly withdrawn.

Shares not purchased in the Offer will be returned to the tendering shareholders at our expense promptly after the Expiration Time. We reserve the right, in our sole discretion, to change the per Share purchase price range and to increase or decrease the aggregate purchase price payable for Shares sought in the Offer, subject to applicable law. In accordance with the rules of the Securities and Exchange Commission (the "SEC"), we may increase the aggregate purchase price payable for Shares purchased in the Offer and thereby increase the number of Shares accepted for payment in the Offer

by no more than 2% of the outstanding Shares without amending or extending the Offer. See Section 1.

The Offer is not conditioned on obtaining financing or on any minimum number of Shares being tendered. The Offer is, however, subject to certain other conditions. See Section 7.

The Shares are listed and traded on the NASDAQ Global Market (the "NASDAQ") under the symbol "EMKR." On May 5, 2015, the last full trading day prior to the announcement and commencement of the Offer, the last reported sale price of the Shares was $5.58 per Share. Shareholders are urged to obtain current market quotations for the Shares before deciding whether and at what purchase price or purchase prices to tender their Shares. See Section 8.

Our board of directors (the "Board of Directors") has approved the Offer. However, neither we nor any member of our Board of Directors; B. Riley & Co., LLC, the dealer manager for the Offer (the "Dealer Manager"); MacKenzie Partners, Inc., the information agent for the Offer (the "Information Agent"); or American Stock Transfer & Trust Company, LLC, the depositary for the Offer (the "Depositary") makes any recommendation to you as to whether you should tender or refrain from tendering your Shares or as to the purchase price or purchase prices at which you may choose to tender your Shares. Neither we nor any member of our Board of Directors, the Dealer Manager, the Information Agent or the Depositary has authorized any person to make any recommendation with respect to the Offer. You must make your own decision as to whether to tender your Shares and, if so, how many Shares to tender and the purchase price or purchase prices at which you will tender them. In doing so, you should consult your financial and tax advisors, and read carefully and evaluate the information in this Offer to Purchase and in the Letter of Transmittal, including our reasons for making the Offer. See Section 2.

Our directors and executive officers are entitled to participate in the Offer on the same basis as all other shareholders. Mr. Becker has informed us that Becker Drapkin Management, L.P. intends to tender an amount of Shares during the Offer that will result in its percentage ownership of the Company following the Expiration Date of the Offer remaining substantially equivalent to its percentage ownership of the Company immediately preceding the Offer. Mr. Bogomolny and Mr. Domenik have informed the Company that they each intend to tender a portion of the Shares beneficially owned by them. Our remaining directors and executive officers have advised us that they do not currently intend to tender Shares in the Offer. The equity ownership of our directors, executive officers and affiliates who do not tender their Shares in the Offer will proportionately increase as a percentage of our outstanding common stock following the consummation of the Offer. See Section 11.

Neither the U.S. Securities and Exchange Commission, any state securities commission, nor any other regulatory body has approved or disapproved of this transaction or passed upon the merits or fairness of such transaction or passed upon the adequacy or accuracy of the information contained in this Offer. Any representation to the contrary is a criminal offense.

If you have questions or need assistance, you should contact the Information Agent or the Dealer Manager at their respective addresses and telephone numbers set forth on the back cover of this Offer to Purchase. If you require additional copies of this Offer to Purchase, the Letter of Transmittal or other related materials, you should contact the Information Agent.

If you want to tender all or a portion of your Shares, you must do one of the following before the Offer expires at 5:00 P.M., New York City time, on Monday, June 15, 2015 (unless the Offer is extended):

If you want to tender your Shares but your certificates for the Shares are not immediately available, or cannot be delivered to the Depositary within the required time, or you cannot comply with the procedure for book-entry transfer on a timely basis, or your other required documents cannot be delivered to the Depositary prior to the Expiration Date, you may still tender your Shares if you comply with the guaranteed delivery procedure described in Section 3.

If you wish to maximize the chance that your Shares will be purchased in the Offer, you should check the box in the section of the Letter of Transmittal captioned "Shares Tendered At Price Determined Under The Offer." If you agree to accept the purchase price determined in the Offer, your Shares will be deemed to be tendered at the minimum price of $6.25 per Share. You should understand that this election may lower the Final Purchase Price and could result in your Shares being purchased at the minimum price of $6.25 per Share.

We are not making the Offer to, and will not accept any tendered Shares from, shareholders in any jurisdiction within the United States where it would be illegal to do so. However, we may, at our discretion, take any actions necessary for us to make the Offer to shareholders in any such jurisdiction.

You may contact the Information Agent, the Dealer Manager or your broker, dealer, commercial bank, trust company or other nominee for assistance. The contact information for the Information Agent and the Dealer Manager is set forth on the back cover of this Offer to Purchase.

We have not authorized any person to give any information or to make any representation in connection with the Offer other than those contained in this Offer to Purchase or in the Letter of Transmittal. You should not rely on any recommendation, or any such representation or information, as having been authorized by us, any member of our Board of Directors, the Dealer Manager, the Information Agent or the Depositary.

We are providing this summary for your convenience. It highlights certain material information in this Offer to Purchase, but it does not describe all of the details of the Offer to the same extent described elsewhere in this Offer to Purchase. We urge you to read the entire Offer to Purchase and the Letter of Transmittal because they contain the full details of the Offer. We have included references to the sections of this Offer to Purchase where you will find a more complete discussion.

The issuer of the Shares, EMCORE Corporation, a New Jersey corporation (the "Company," "EMCORE," "we," or "us"), is offering to purchase the Shares. See Section 1.

We are offering to purchase Shares up to an aggregate purchase price of $45 million. See Section 1.

We believe that the Offer is a prudent use of our financial resources, and provides an efficient way of returning capital to shareholders while providing long-term shareholder value. In particular, the Board of Directors has determined that the all-cash Offer is an effective method for the Company to return to our shareholders a significant portion of the proceeds from the recent sale of our Photovoltaics business to SolAero Technologies Corp. (f/k/a Photon Acquisition Corporation), as well as the recent sale of our Digital Products business to NeoPhotonics Corporation.

Our Board of Directors considered various factors and information before approving the Offer, including, without limitation, other possible methods of repurchasing the Shares, including in the open market or through a fixed price tender offer for the Shares, recent trends in the market regarding modified "Dutch auction" tender offers, trends in the equity market generally, shareholder input, and historical trading performance of our Shares, of the stock of comparable public companies and of related market indices.

We believe that the modified "Dutch auction" tender offer set forth in this Offer to Purchase represents a mechanism to provide our shareholders with the opportunity to tender all or a portion of their Shares and thereby receive a return of some or all of their investment if they so elect. We believe that the Offer provides shareholders (particularly those who, because of the size of their shareholdings, might not be able to sell their Shares without potential disruption to the Share price) with an opportunity to obtain liquidity with respect to all or a portion of their Shares without potential disruption to the Share price. In addition, if we complete the Offer, shareholders who do not participate in the Offer will automatically increase their relative percentage ownership interest in the Company and our future operations at no additional cost to them. See Section 2.

The Offer also provides our shareholders with an efficient way to sell their Shares without incurring broker's fees or commissions associated with open market sales. However, shareholders who hold Shares through nominees are urged to consult their nominees to determine whether transaction costs may apply if shareholders tender Shares through the nominees and not directly to the Depositary. Furthermore, "odd lot holders" who hold Shares registered in their names and tender their Shares directly to the Depositary and whose Shares are purchased in the Offer will avoid any applicable odd lot discounts that might otherwise be payable on sales of their Shares. See Section 1 and Section 2.

We will purchase Shares in the Offer up to an aggregate purchase price of $45 million or a lower aggregate purchase price depending on the number of Shares properly tendered and not properly withdrawn.

If, based on the Final Purchase Price, Shares having an aggregate purchase price of more than $45 million are properly tendered and not properly withdrawn, we will purchase all Shares tendered at or below the Final Purchase Price on a pro rata basis, except for "odd lots" (of less than 100 Shares), which we will purchase on a priority basis. We expressly reserve the right to purchase additional Shares in the Offer, subject to applicable law. See Section 1. The Offer is not conditioned on any minimum number of Shares being tendered but is subject to certain other conditions. See Section 7.

In accordance with the rules of the SEC, we may increase the aggregate purchase price payable for Shares purchased in the Offer and thereby increase the number of Shares accepted for payment in the Offer by no more than 2% of the outstanding Shares without amending or extending the Offer. See Section 1.

What will the purchase price for the Shares be and what will be the form of payment?

We are conducting the Offer through a procedure commonly called a modified "Dutch auction," which allows you to select the price (in increments of $0.10), within a price range specified by us, at which you are willing to sell your Shares. The price range for the Offer is $6.25 to $6.75 per Share. We will select the lowest purchase price, not greater than $6.75 per Share nor less than $6.25 per Share, that will allow us to purchase Shares having an aggregate purchase price of $45 million, based on the number of Shares properly tendered, or, if fewer Shares are properly tendered, all Shares that are properly tendered and not properly withdrawn. We will purchase all Shares properly tendered and not properly withdrawn from the Offer at the Final Purchase Price, even if you have selected a purchase price lower than the Final Purchase Price, but we will not purchase any Shares tendered at a price above the Final Purchase Price.

If you wish to maximize the chance that we will purchase your Shares, you should check the box in the section captioned "Shares Tendered At Price Determined Under The Offer" in the section of the Letter of Transmittal captioned "Price (In Dollars) Per Share At Which Shares Are Being Tendered," indicating that you will accept the Final Purchase Price. You should understand that this election may have the effect of lowering the Final Purchase Price and could result in your Shares being purchased at the minimum price of $6.25 per Share.

If we purchase your Shares in the Offer, we will pay you the Final Purchase Price in cash, less any applicable withholding taxes and without interest, promptly after the Expiration Time. Under no circumstances will we pay interest on the Final Purchase Price, even if there is a delay in making payment. See the Introduction, Section 1, Section 3 and Section 5.

The maximum aggregate purchase price of Shares purchased in the Offer will be $45 million. We expect the maximum aggregate cost of this purchase, including all fees and expenses applicable to the Offer, to be approximately $800,000. We will use cash on hand to purchase Shares in the Offer and to pay all related fees and expenses. See Section 9.

You may tender your Shares until the Offer expires. The Offer will expire on Monday, June 15, 2015, at 5:00 P.M. New York City time, unless we extend the Offer. See Section 1. We may choose to extend the Offer at any time and for any reason. We cannot assure you, however, that we will extend the Offer or, if we extend it, for how long. See Section 1 and Section 15. If a broker, dealer, commercial bank, trust company or other nominee holds your Shares, it may have an earlier deadline for accepting the Offer and we urge you to contact your broker, dealer, commercial bank, trust company or other nominee to find out its deadline. See Section 3.

Can the Offer be extended, amended or terminated, and if so, under what circumstances?

Yes. We can extend or amend the Offer in our sole discretion. If we extend the Offer, we may delay the acceptance of any Shares that have been tendered. See Section 15. We can terminate the Offer under certain circumstances. See Section 7.

How will I be notified if EMCORE extends the Offer or amends the terms of the Offer?

If we extend the Offer, we will issue a press release not later than 9:00 a.m., New York City time, on the first business day after the previously scheduled Expiration Time. We will announce any amendment to the Offer by making a public announcement of the amendment. See Section 15.

Yes. Our obligation to accept for payment and pay for your tendered Shares depends upon a number of conditions that must be satisfied or waived on or prior to the Expiration Time, including:

For a more detailed discussion of these and other conditions of the Offer, please see Section 7.

If you want to tender all or a portion of your Shares, you must do one of the following before 5:00 P.M., New York City time, on Monday, June 15, 2015, or any later time and date to which the Offer may be extended:

Once I have tendered Shares in the Offer, may I withdraw my tendered Shares?

Yes. You may withdraw any Shares you have tendered at any time before 5:00 P.M., New York City time, on Monday, June 15, 2015, unless we extend the Offer, in which case you may withdraw your Shares until the Expiration Time, as extended. If we have not accepted for payment the Shares you have tendered to us, you may also withdraw your Shares at any time after 5:00 P.M., New York City time, on Tuesday, July 14, 2015. See Section 4.

To properly withdraw Shares previously tendered, you must deliver on a timely basis a written notice of your withdrawal to the Depositary at one of its addresses appearing on the back cover of this Offer to Purchase. Your notice of withdrawal must specify your name, the number of Shares to be withdrawn and the name of the registered holder of the Shares. Some additional requirements apply if the certificates for Shares to be withdrawn have been delivered to the Depositary or if your Shares have been tendered under the procedure for book-entry transfer set forth in Section 3. See Section 4.

Therefore, it is possible that we will not purchase all of the Shares that you tender even if you tender them at or below the Final Purchase Price. See Section 1.

Our Board of Directors has approved the Offer. However, neither we nor any member of our Board of Directors, the Dealer Manager, the Depositary or the Information Agent makes any recommendation to you as to whether you should tender or refrain from tendering your Shares or as to the purchase price or purchase prices at which you may choose to tender your Shares. You must make your own decision as to whether to tender your Shares and, if so, how many Shares to tender and the purchase price or purchase prices at which you will tender them. In doing so, you should read carefully the information in this Offer to Purchase and in the Letter of Transmittal, including our reasons for making the Offer. See Section 2. You should discuss whether to tender your Shares with your broker or other financial or tax advisors.

Will EMCORE's directors, executive officers and affiliates tender Shares in the Offer?

Shareholders who decide not to tender their Shares will own a greater percentage interest in the outstanding Shares following the consummation of the Offer. See Section 2.

Yes. We believe that the Shares will continue to be authorized for trading on the NASDAQ and that we will continue to be subject to the reporting requirements of the Exchange Act. See Section 2.

We will pay the Final Purchase Price net to the seller, in cash, less applicable withholding taxes and without interest, for the Shares we purchase promptly after the Expiration Time. We will announce the preliminary results of the Offer, including price and preliminary information about any expected proration, on the business day following the Expiration Time. Promptly after determining the final

results of any proration or the Final Purchase Price, we will announce the Final Purchase Price and begin paying for tendered Shares. We will pay for the Shares accepted for purchase by depositing the aggregate purchase price with the Depositary, promptly thereafter. The Depositary will act as your agent and will transmit to you the payment for all of your Shares accepted for payment. See Section 1 and Section 5.

If I am a holder of vested stock options, how do I participate in the Offer?

If you are a holder of vested stock options, you may exercise your vested options and tender any Shares issued upon such exercise. You must exercise your options sufficiently in advance of the Expiration Time in order to have time for such exercise to settle before the Shares received upon exercise of the options may be tendered. An exercise of an option cannot be revoked even if Shares received upon the exercise thereof and tendered in the Offer are not purchased in the Offer for any reason.

Restricted stock awards and restricted stock units cannot be tendered in the Offer. To the extent that your restricted stock awards or units vest and the underlying Shares are issued to you prior to the Expiration Time, you will be entitled to tender those Shares in the Offer, subject to the terms and conditions of the Offer.

Shares that you acquired under our 401(k) Plan, Employee Stock Purchase Plan and Officer and Director Share Purchase Plan may be tendered in the Offer, subject to the terms and conditions of the applicable plan and subject to the terms and conditions of the Offer. See the Introduction and Section 3.

On May 5, 2015, the last full trading day before the announcement and commencement of the Offer, the last reported sale price of the Shares on the NASDAQ was $5.58 per Share. You are urged to obtain current market quotations for the Shares before deciding whether and at what purchase price or purchase prices to tender your Shares. See Section 8.

If you are a registered shareholder and you tender your Shares directly to the Depositary, you will not incur any brokerage commissions. If you hold Shares through a broker, dealer, commercial bank, trust company or other nominee, we urge you to consult your broker, dealer, commercial bank, trust company or other nominee to determine whether any transaction costs will apply. See Section 3 and Section 16.

If you instruct the Depositary in the Letter of Transmittal to make the payment for the Shares to the registered holder, you will not incur any stock transfer tax. See Section 5.

What are the United States federal income tax consequences if I tender my Shares?

Generally, if you are a U.S. Holder (as defined in Section 14), your receipt of cash from us in exchange for the Shares you tender will be a taxable transaction for United States federal income tax purposes. The cash you receive for your tendered Shares will generally be treated for United States federal income tax purposes either as consideration received in respect of a sale or exchange of the Shares purchased by us or as a distribution from us in respect of Shares. Non-U.S. Holders (as defined in Section 14) may be subject to income or withholding taxes upon the disposition of Shares pursuant to the Offer. The Depositary will withhold 30% of the gross proceeds payable to a Non-U.S. Holder

unless the holder provides the Depositary with (i) a properly executed IRS Form W-8BEN (or other applicable Form W-8) certifying that it is entitled to a reduced rate of withholding under an applicable treaty or (ii) a properly executed IRS Form W-8ECI certifying that it is exempt from withholding because the payment is effectively connected with Non-U.S. Holder's conduct of a trade or business in the United States. Non-U.S. Holders may be eligible for a refund of amounts withheld to the extent consideration received is in respect of a sale or exchange of Shares or is otherwise not subject to withholding tax. Please see Section 14 for a more detailed summary on the tax treatment of the Offer to U.S. and Non-U.S. Holders. As described in Section 14, the number of Shares that we will purchase from a shareholder pursuant to the Offer may affect the United States federal income tax consequences to the shareholder of the purchase, and therefore, will be relevant to a shareholder's decision whether to tender Shares. Accordingly, all shareholders are urged to consult their tax advisors regarding the United States federal income tax consequences of participating in the Offer.

The Information Agent and the Dealer Manager can help answer your questions. The Information Agent is MacKenzie Partners, Inc. and the Dealer Manager is B. Riley & Co., LLC. Their contact information is set forth on the back cover of this Offer to Purchase.

This Offer to Purchase contains certain "forward-looking statements" within the meaning of Section 27A of the Securities Act of 1933, as amended (the "Securities Act") and Section 21E of the Securities and Exchange Act of 1934, as amended (the "Exchange Act"). These forward-looking statements are made pursuant to the safe harbor provisions of the Private Securities Litigation Reform Act of 1995. These forward-looking statements are largely based on our current expectations and projections about future events and financial trends affecting the financial condition of our business. Such forward-looking statements include, in particular, projections about our future results included in our Exchange Act reports, statements about our plans, strategies, business prospects, changes and trends in our business and the markets in which we operate. These forward-looking statements may be identified by the use of terms and phrases such as "anticipates," "believes," "can," "could," "estimates," "expects," "forecasts," "intends," "may," "plans," "projects," "should," "targets," "will," "would," and similar expressions or variations of these terms and similar phrases. Additionally, statements concerning future matters such as our expected liquidity, development of new products, enhancements or technologies, sales levels, expense levels, the ability of the Company to commence and complete the tender offer, the price at which the Company purchases common stock pursuant to the tender offer or otherwise, the number of shares it is able to purchase pursuant to the tender offer or otherwise, the ability of the Company to achieve the benefits contemplated by the tender offer and other statements regarding matters that are not historical are forward-looking statements. Management cautions that these forward-looking statements relate to future events or our future financial performance and are subject to business, economic, and other risks and uncertainties, both known and unknown, that may cause actual results, levels of activity, performance, or achievements of our business or our industry to be materially different from those expressed or implied by any forward-looking statements. Factors that could cause or contribute to such differences in results and outcomes include without limitation those discussed under Item 1A—Risk Factors in our Annual Report on Form 10-K for the fiscal year ended September 30, 2014, as updated by our subsequent periodic reports. These cautionary statements apply to all forward-looking statements wherever they appear in this Offer to Purchase.

Forward-looking statements are based on certain assumptions and analysis made in light of our experience and perception of historical trends, current conditions and expected future developments as well as other factors that we believe are appropriate under the circumstances. While these statements represent our judgment on what the future may hold, and we believe these judgments are reasonable, these statements are not guarantees of any events or financial results. All forward-looking statements in this Offer to Purchase are made as of the date hereof, based on information available to us as of the date hereof, and subsequent facts or circumstances may contradict, obviate, undermine, or otherwise fail to support or substantiate such statements. We caution you not to rely on these statements without also considering the risks and uncertainties associated with these statements and our business that are addressed in this Offer to Purchase. Certain information included in this Offer to Purchase may supersede or supplement forward-looking statements in our other reports filed with the Securities and Exchange Commission. We assume no obligation to update any forward-looking statement to conform such statements to actual results or to changes in our expectations, except as required by applicable law or regulation.

We invite our shareholders to tender shares of our common stock, no par value per share, for purchase by us at a price not greater than $6.75 per Share nor less than $6.25 per Share, net to the seller in cash, less any applicable withholding taxes and without interest, upon the terms and subject to the conditions described in this Offer to Purchase and in the related Letter of Transmittal, which together, as they may be amended or supplemented from time to time, constitute the Offer.

The Offer will expire on Monday, June 15, 2015, at 5:00 p.m., New York City time, unless the Offer is extended or withdrawn (such date, as it may be extended, the "Expiration Date.")

We are offering to purchase Shares in the Offer up to an aggregate purchase price of $45 million. Upon the terms and subject to the conditions of the Offer, we will determine a single per Share price that we will pay for Shares properly tendered and not properly withdrawn from the Offer, taking into account the total number of Shares properly tendered and the prices specified by tendering shareholders. We will select the lowest purchase price, not greater than $6.75 per Share nor less than $6.25 per Share, that will allow us to purchase Shares having an aggregate purchase price of $45 million, or a lower aggregate purchase price depending on the number of Shares properly tendered and not properly withdrawn. We refer to the price we will select as the Final Purchase Price. We will acquire all Shares properly tendered and not properly withdrawn from the Offer at the Final Purchase Price, on the terms and subject to the conditions of the Offer, including proration provisions.

We will only purchase Shares properly tendered at prices at or below the Final Purchase Price and not properly withdrawn. However, because of the odd lot priority, proration (if Shares having an aggregate purchase price greater than the aggregate purchase price we seek are properly tendered and not properly withdrawn) and conditional tender provisions described in this Offer to Purchase, we may not purchase all of the Shares tendered at or below the Final Purchase Price. If, based on the Final Purchase Price, Shares having an aggregate purchase price of less than $45 million are properly tendered and not properly withdrawn, we will buy all Shares properly tendered and not properly withdrawn. Shares not purchased in the Offer, including Shares tendered at prices in excess of the Final Purchase Price and Shares not purchased because of proration or conditional tenders, will be returned to the tendering shareholders at our expense promptly after the Expiration Time. See Section 1.

If you are a holder of vested options, you may exercise your vested options and tender any of the Shares issued upon exercise. You must exercise your options sufficiently in advance of the Expiration Time in order to have time for such exercise to settle before the Shares received upon exercise of the options may be tendered. An exercise of an option cannot be revoked even if Shares received upon the exercise thereof and tendered in the Offer are not purchased in the Offer for any reason. See Section 3.

The Offer is not conditioned on any minimum number of Shares being tendered. The Offer is, however, subject to certain other conditions. See Section 7.

The Board of Directors has approved the Offer. However, neither we nor any member of our Board of Directors, the Dealer Manager, the Information Agent or the Depositary makes any recommendation to you as to whether you should tender or refrain from tendering your Shares or as to the purchase price or purchase prices at which you may choose to tender your Shares. Neither we nor any member of our Board of Directors, the Dealer Manager, the Information Agent or the Depositary has authorized any person to make any recommendation with respect to the Offer. You must make your own decision as to whether to tender your Shares and, if so, how many Shares to tender and the purchase price or purchase prices at which you will tender them. In doing so, you should consult your financial and tax advisors, and read carefully and evaluate the information in this Offer to Purchase and in the Letter of Transmittal, including our reasons for making the Offer.

We will pay all fees and expenses incurred in connection with the Offer by the Dealer Manager, the Information Agent and the Depositary. See Section 16.

As of May 1, 2015, we had 32,296,486 issued and outstanding Shares, excluding 39,795 Shares held in treasury. As of that date, there were, in the aggregate, 1,765,982 Shares available for grant or award under our equity compensation plans. We also had 1,066,591 Shares subject to outstanding options and 592,420 restricted stock units ("RSUs") outstanding under the plans.

The Shares are listed and traded on the NASDAQ under the symbol "EMKR." On May 5, 2015, the last full trading day prior to the announcement and commencement of the Offer, the last reported sale price of the Shares was $5.58 per Share. Shareholders are urged to obtain current market quotations for the Shares before deciding whether and at what purchase price or purchase prices to tender their Shares. See Section 8 and Section 11.

Our principal executive offices are located at 2015 W. Chestnut Street, Alhambra California 91803 and our phone number is (626) 293-3400.

Upon the terms and subject to the conditions of the Offer, we will purchase Shares up to an aggregate purchase price of $45 million, or a lower aggregate purchase price depending on the number of Shares properly tendered and not properly withdrawn in accordance with Section 4 before the Expiration Time, at a price not greater than $6.75 per Share nor less than $6.25 per Share, net to the seller in cash, less any applicable withholding taxes and without interest. We refer to such purchase price as the Final Purchase Price. If, based on the Final Purchase Price, Shares having an aggregate purchase price of less than $45 million are properly tendered and not properly withdrawn, we will buy all Shares properly tendered and not properly withdrawn.

The term "Expiration Time" or "Expiration Date" means 5:00 P.M., New York City time, on Monday, June 15, 2015, unless and until we, in our sole discretion, shall have extended the period of time during which the Offer will remain open, in which event the term "Expiration Time" or "Expiration Date" shall refer to the latest time and date at which the Offer, as so extended by us, shall expire. See Section 15 for a description of our right to extend, delay, terminate or amend the Offer.

In accordance with Instruction 5 of the Letter of Transmittal, shareholders desiring to tender Shares must either:

Promptly following the Expiration Time, we will determine the Final Purchase Price that we will pay for Shares properly tendered and not properly withdrawn, taking into account the number of Shares tendered and the prices specified by tendering shareholders. We will select the lowest purchase price, not greater than $6.75 per Share nor less than $6.25 per Share, that will allow us to purchase Shares having an aggregate purchase price of $45 million, or a lower aggregate purchase price depending on the number of Shares properly tendered and not properly withdrawn. All Shares tendered in the Offer and accepted for purchase by us will be purchased at the Final Purchase Price.

If you agree to accept the purchase price determined in the Offer, your Shares will be deemed to be tendered at the minimum price of $6.25 per Share for purposes of determining the Final Purchase Price. You should understand that this election may effectively lower the Final Purchase Price and could result in your Shares being purchased at the minimum price of $6.25 per Share.

We will announce the preliminary results of the Offer, including price and preliminary information about any expected proration, on the business day following the Expiration Time. Promptly after determining the final results of any proration or the Final Purchase Price, we will announce the Final Purchase Price and begin paying for tendered Shares. We will only purchase Shares properly tendered at prices at or below the Final Purchase Price and not properly withdrawn. However, because of the odd lot priority, proration and conditional tender provisions of the Offer, we may not purchase all of the Shares tendered at or below the Final Purchase Price if, based on the Final Purchase Price, Shares having an aggregate purchase price of more than $45 million are properly tendered and not properly withdrawn. We will return all Shares tendered and not purchased pursuant to the Offer, including Shares tendered at prices in excess of the Final Purchase Price and Shares not purchased because of proration or conditional tenders, to the tendering shareholders at our expense, promptly following the Expiration Time.

By following the instructions to the Letter of Transmittal, shareholders can specify different minimum prices for specified portions of their Shares, but a separate Letter of Transmittal must be submitted for Shares tendered at each price. Shareholders can also specify the order in which the specified portions of their Shares will be purchased in the event that, as a result of proration or otherwise, some but not all of the tendered Shares are purchased pursuant to the Offer. In the event a shareholder does not designate such order and fewer than all Shares are purchased due to proration, the Depositary will select the order of Shares purchased.

We expressly reserve the right, in our sole discretion, to change the per Share purchase price range and to increase or decrease the aggregate purchase price payable for Shares sought in the Offer. We may increase the aggregate purchase price of Shares sought in the Offer to an amount greater than $45 million, subject to applicable law. In accordance with the rules of the SEC, we may increase the aggregate purchase price payable for Shares purchased in the Offer and thereby increase the number of Shares accepted for payment in the Offer by no more than 2% of the outstanding Shares without amending or extending the Offer. However, if we purchase an additional number of Shares in excess of 2% of the outstanding Shares, we will amend and extend the Offer in compliance with applicable law. See Section 15.

In the event that the Offer is oversubscribed, as described below, Shares tendered at or below the Final Purchase Price prior to the Expiration Time will be subject to proration, except for odd lots. The withdrawal rights also expire at the Expiration Time.

The Offer is not conditioned on any minimum number of Shares being tendered. The Offer is, however, subject to certain other conditions. See Section 7.

Priority of Purchases. On the terms and subject to the conditions of the Offer, if, based on the Final Purchase Price, Shares having an aggregate purchase price in excess of $45 million (or such greater aggregate purchase price as we may elect, subject to applicable law) have been properly tendered at prices at or below the Final Purchase Price and not properly withdrawn before the Expiration Time, we will purchase properly tendered Shares on the basis set forth below:

As a result of the foregoing priorities applicable to the purchase of Shares tendered, it is possible that fewer than all Shares tendered by a shareholder will be purchased or that, if a tender is

conditioned upon the purchase of a specified number of Shares, none of those Shares will be purchased even though such Shares were tendered at prices at or below the Final Purchase Price.

As we noted above, we may elect to purchase Shares having an aggregate purchase price of more than $45 million in the Offer, subject to applicable law. If we do so, the preceding provisions will apply to the greater amount.

Odd Lots. For purposes of the Offer, the term "odd lots" means all Shares properly tendered at prices at or below the Final Purchase Price held by a shareholder who owns beneficially or of record an aggregate of fewer than 100 Shares, which we refer to as an "odd lot holder," and so certifies in the appropriate place on the Letter of Transmittal, and, if applicable, on the Notice of Guaranteed Delivery. To qualify for this preference, an odd lot holder must tender all Shares owned beneficially or of record by the odd lot holder in accordance with the procedures described in Section 3. As set forth above, odd lots will be accepted for payment before proration, if any, of the purchase of other tendered Shares. This preference is not available to partial tenders or to beneficial or record holders of an aggregate of 100 or more Shares, even if these holders have separate accounts or certificates representing fewer than 100 Shares. By accepting the Offer, an odd lot holder who holds Shares in his or her name and tenders his or her Shares directly to the Depositary would not only avoid the payment of brokerage commissions, but also would avoid any applicable odd lot discounts in a sale of the holder's Shares. Any odd lot holder wishing to tender all of such odd lot holder's Shares pursuant to the Offer should complete the section captioned "Odd Lots" in the Letter of Transmittal, and, if applicable, in the Notice of Guaranteed Delivery.

Proration. If proration of tendered Shares is required, we will determine the proration factor promptly following the Expiration Time. Proration for each shareholder tendering Shares, other than odd lot holders, will be based on the ratio of the number of Shares properly tendered and not properly withdrawn by such shareholder to the total number of Shares properly tendered and not properly withdrawn by all shareholders, other than odd lot holders, at or below the Final Purchase Price (excluding Shares subject to conditional tenders for which the condition was not initially satisfied). The preliminary results of any proration will be announced by press release on the business day following the Expiration Time. After the Expiration Time, shareholders may obtain any preliminary proration information from the Information Agent and also may be able to obtain the information from their brokers.

As described in Section 14, the number of Shares that we will purchase from a shareholder pursuant to the Offer may affect the United States federal income tax consequences to the shareholder of the purchase and, therefore, will be relevant to a shareholder's decision whether to tender Shares. The Letter of Transmittal affords each shareholder who tenders Shares registered in such shareholder's name directly to the Depositary the opportunity to designate the order of priority in which Shares tendered are to be purchased in the event of proration as well as the ability to condition such tender on a minimum number of Shares being purchased.

This Offer to Purchase and the Letter of Transmittal will be mailed to record holders of the Shares and will be furnished to brokers, dealers, commercial banks, trust companies and other nominees and similar persons whose names, or the names of whose nominees, appear on our shareholder list or, if applicable, who are listed as participants in a clearing agency's security position listing for subsequent transmittal to beneficial owners of Shares.

Purpose of the Offer. The Board of Directors believes that the Offer is a prudent use of our financial resources, and provides an efficient way of returning capital to shareholders while providing long-term shareholder value. In particular, the Board of Directors has determined that the all-cash Offer is an effective method for the Company to return to our shareholders a significant portion of the proceeds from the recent sale of our Photovoltaics business to SolAero Technologies Corp. (f/k/a Photon Acquisition Corporation), as well as the recent sale of our Digital Products business to NeoPhotonics Corporation.

In addition, the Board of Directors believes that the modified "Dutch auction" tender offer set forth in this Offer to Purchase represents a mechanism to provide our shareholders with the opportunity to tender all or a portion of their Shares and, thereby, receive a return of some or all of their investment if they so elect. We believe that the Offer provides shareholders (particularly those who, because of the size of their shareholdings, might not be able to sell their Shares without potential disruption to the Share price) with an opportunity to obtain liquidity with respect to all or a portion of their Shares without potential disruption to the Share price. In addition, if we complete the Offer, shareholders who do not participate in the Offer will automatically increase their relative percentage ownership interest in us and our future operations.

The Offer also provides our shareholders with an efficient way to sell their Shares without incurring broker's fees or commissions associated with open market sales. However, shareholders who hold Shares through nominees are urged to consult their nominees to determine whether transaction costs may apply if shareholders tender Shares through the nominees and not directly to the Depositary. Furthermore, odd lot holders who hold Shares registered in their names and tender their Shares directly to the Depositary and whose Shares are purchased in the Offer will avoid any applicable odd lot discounts that might otherwise be payable on sales of their Shares. See Section 1.

In considering the Offer, the Board of Directors took into account the expected financial impact of the Offer, and concluded that the Offer is a prudent use of our financial resources given our business profile, assets and current market price. The Board of Directors considered various additional factors and information before approving the Offer, including, without limitation, other possible methods of repurchasing the Shares, including in the open market or through a fixed price tender offer for the Shares, recent trends in the market regarding modified "Dutch auction" tender offers, trends in the equity market generally, shareholder input, and historical trading performance of our Shares, of the stock of comparable public companies and of related market indices.

Following the completion or termination of the Offer, we may, from time to time, make additional repurchases of Shares, either in the open market, through public or privately negotiated transactions, in additional tender offers, or otherwise, in accordance with applicable law. Exchange Act Rule 13e-4 generally prohibits us and our affiliates from purchasing any Shares, other than in the Offer, until at least ten business days after the Expiration Time, except pursuant to certain limited exceptions provided in Exchange Act Rule 14e-5.

Our directors and executive officers are entitled to participate in the Offer on the same basis as all other shareholders. Mr. Becker has informed us that Becker Drapkin Management, L.P. intends to tender an amount of Shares during the Offer that will result in its percentage ownership of the Company following the Expiration Date of the Offer remaining substantially equivalent to its percentage ownership of the Company immediately preceding the Offer. Mr. Bogomolny and Mr. Domenik have informed the Company that they each intend to tender a portion of Shares beneficially owned by them. Our remaining directors and executive officers have advised us that they do not currently intend to tender Shares in the Offer. The equity ownership of our directors, executive officers and affiliates who do not tender their Shares in the Offer will proportionately increase as a percentage of our outstanding common stock following the consummation of the Offer. See Section 11.

Certain Effects of the Offer. Shareholders who decide not to tender their Shares will own a greater percentage interest in the outstanding Shares following the consummation of the Offer. These shareholders will also continue to bear the risks associated with owning the Shares, including risks resulting from our purchase of Shares in the Offer. Shareholders may be able to sell non-tendered Shares in the future on the NASDAQ or otherwise, at a net price significantly higher or lower than the Final Purchase Price in the Offer. We can give no assurance, however, as to the price at which a shareholder may be able to sell his or her Shares in the future.

We anticipate that there will be a sufficient number of Shares outstanding and publicly traded following completion of the Offer to ensure a continued trading market for the Shares. Based upon the NASDAQ's published guidelines, we do not believe that our purchase of Shares in the Offer will cause our remaining outstanding Shares to be delisted from the NASDAQ. We also believe that our purchase of Shares in the Offer will not result in the Shares becoming eligible for deregistration under the Exchange Act.

Shares we acquire pursuant to the Offer will be held in treasury until otherwise directed by the Board of Directors.

Except as disclosed or incorporated by reference in this Offer to Purchase, we currently have no plans, proposals or negotiations that relate to or would result in:

Although we may not currently have any plans, other than as disclosed or incorporated by reference in this Offer to Purchase, that relate to or would result in any of the events discussed above, we may undertake or plan actions that relate to or could result in one or more of these events.

Proper Tender of Shares. For Shares to be tendered properly pursuant to the Offer, the certificates for such Shares (or confirmation of receipt of such Shares pursuant to the procedure for book-entry transfer set forth below), together with a properly completed and duly executed Letter of Transmittal, including any required signature guarantees, or an "Agent's Message" (as defined below), and any other documents required by the Letter of Transmittal, must be received before 5:00 P.M., New York City time, on Monday, June 15, 2015 by the Depositary at one of its addresses set forth on the back cover of this Offer to Purchase, or the tendering shareholder must, prior to the Expiration date, comply with the guaranteed delivery procedure set forth below.

In accordance with Instruction 5 of the Letter of Transmittal, shareholders desiring to tender Shares under the Offer must complete the section captioned "Price (In Dollars) Per Share At Which Shares Are Being Tendered" by either (1) checking the box in the section entitled "Shares Tendered At Price Determined Under The Offer" or (2) checking one of the boxes in the section captioned "Shares Tendered At Price Determined By Shareholder," indicating the price at which Shares are being tendered.

Shareholders who desire to tender Shares at more than one price must complete a separate Letter of Transmittal for each price at which Shares are tendered, provided that the same Shares cannot be tendered (unless properly withdrawn previously in accordance with Section 4) at more than one price. To tender Shares properly, one and only one box must be checked in the section captioned "Price (In Dollars) Per Share At Which Shares Are Being Tendered" in the Letter of Transmittal.

If tendering shareholders wish to maximize the chance that we will purchase their Shares, they should check the box in the section captioned "Shares Tendered At Price Determined Under The Offer" in the Letter of Transmittal under the section captioned "Price (In Dollars) Per Share At Which Shares Are Being Tendered." Note that this election may have the effect of lowering the Final Purchase Price and could result in the tendered Shares being purchased at the minimum price of $6.25 per Share. If tendering shareholders wish to indicate a specific price (in increments of $0.10) at which their Shares are being tendered, they must check the appropriate box in the section captioned "Shares Tendered At Price Determined By Shareholder" in the section captioned "Price (In Dollars) Per Share At Which Shares Are Being Tendered" in the Letter of Transmittal. Tendering shareholders should be aware that this election could mean that none of their Shares will be purchased if they check a box other than the box representing the price at or below the Final Purchase Price. In addition, odd lot holders who tender all of their Shares must complete the section captioned "Odd Lots" in the Letter of Transmittal, and, if applicable, in the Notice of Guaranteed Delivery, to qualify for the preferential treatment available to odd lot holders as set forth in Section 1.

Shareholders holding their Shares through a broker, dealer, commercial bank, trust company or other nominee must contact the nominee in order to tender their Shares. Shareholders who hold Shares through nominees are urged to consult their nominees to determine whether transaction costs may apply if shareholders tender Shares through the nominees and not directly to the Depositary.

Shareholders may tender Shares subject to the condition that all, or a specified minimum number of Shares, be purchased. Any shareholder desiring to make such a conditional tender should so indicate in the section captioned "Conditional Tender" in the Letter of Transmittal, and, if applicable, in the

Notice of Guaranteed Delivery. It is the tendering shareholder's responsibility to determine the minimum number of Shares to be purchased. Shareholders should consult their financial and tax advisors with respect to the effect of proration of the Offer and the advisability of making a conditional tender. See Section 6 and Section 14.

Signature Guarantees and Method of Delivery. No signature guarantee is required if:

If a certificate for Shares is registered in the name of a person other than the person executing the Letter of Transmittal, or if payment is to be made, or Shares not purchased or tendered are to be issued, to a person other than the registered holder, then the certificate must be endorsed or accompanied by an appropriate stock power, signed in either case exactly as the name of the registered holder appears on the certificate, with the signature guaranteed by an Eligible Institution.

Payment for Shares tendered and accepted for payment pursuant to the Offer will be made only after timely receipt by the Depositary of:

The method of delivery of all documents, including certificates for Shares, the Letter of Transmittal and any other required documents, is at the sole election and risk of the tendering shareholder. If delivery is by mail, then registered mail with return receipt requested, properly insured, is recommended. Shares will be deemed delivered only when actually received by the Depositary (including, in the case of a book-entry transfer, by book-entry confirmation). In all cases, sufficient time should be allowed to ensure timely delivery.

All deliveries in connection with the Offer, including deliveries of a Letter of Transmittal and certificates for Shares, must be made to the Depositary and not to us, the Dealer Manager, the Information Agent or the Book-Entry Transfer Facility. Any documents delivered to us, the Dealer Manager, the Information Agent or the Book-Entry Transfer Facility will not be forwarded to the Depositary and the Shares to which such documents relate will not be deemed to be properly tendered.

Book-Entry Delivery. The Depositary will establish an account with respect to the Shares for purposes of the Offer at the Book-Entry Transfer Facility within two business days after the date of this Offer to Purchase, and any financial institution that is a participant in the Book-Entry Transfer Facility's system may make book-entry delivery of the Shares by means of a book-entry transfer by causing the Book-Entry Transfer Facility to transfer Shares into the Depositary's account in accordance with the Book-Entry Transfer Facility's procedures for transfer. Although delivery of Shares may be effected through a book-entry transfer into the Depositary's account at the Book-Entry Transfer Facility, a properly completed and duly executed Letter of Transmittal, including any required signature guarantees, or an Agent's Message, and any other required documents must, in any case, be transmitted to and received by the Depositary at one of its addresses set forth on the back cover of this Offer to Purchase before the Expiration Time, or the guaranteed delivery procedure described below must be followed if book-entry transfer of the Shares cannot be effected prior to the Expiration Date. Delivery of documents to the Book-Entry Transfer Facility does not constitute delivery to the Depositary.

The term "Agent's Message" means a message transmitted by the Book-Entry Transfer Facility to, and received by, the Depositary, which states that the Book-Entry Transfer Facility has received an express acknowledgment from the participant in the Book-Entry Transfer Facility tendering the Shares that such participant has received and agrees to be bound by the terms of the Letter of Transmittal and that we may enforce such agreement against the participant.

Guaranteed Delivery. If a stockholder desires to tender Shares in the Offer and the stockholder's Share certificates are not immediately available or cannot be delivered to the Depositary prior to the Expiration Date (or the procedures for book-entry transfer cannot be completed on a timely basis), or if time will not permit delivery of all required documents to the Depositary prior to the Expiration Date, the Shares may still be tendered if all of the following conditions are satisfied:

Stockholders may contact the Information Agent, the Dealer Manager or their broker for assistance. The contact information for the Information Agent and Dealer Manager is on the back cover page of this Offer to Purchase.

Procedures for Stock Options. We are not offering, as part of the Offer, to purchase any outstanding stock options, and tenders of stock options will not be accepted. Holders of vested stock options may exercise options and tender the Shares received upon exercise into the Offer. Options must be exercised sufficiently in advance of the Expiration Time in order to have time for such exercise to settle before the Shares received upon exercise of the options may be timely tendered by their holders in the Offer. An exercise of an option cannot be revoked even if Shares received upon the exercise thereof and tendered in the Offer are not purchased in the Offer for any reason.

Restricted Stock and Restricted Stock Units. Restricted stock awards and restricted stock units cannot be tendered in the Offer. To the extent that your restricted stock awards or units vest and the underlying Shares are issued to you prior to the Expiration Time, you will be entitled to tender those Shares in the Offer, subject to the terms and conditions of the Offer.

Shares Acquired under Company Plans. Shares that you acquired under our 401(k) Plan, Employee Stock Purchase Plan and Officer and Director Share Purchase Plan may be tendered in the Offer, subject to the terms and conditions of the applicable plan and subject to the terms and conditions of the Offer.

Return of Unpurchased Shares. If any tendered Shares are not purchased in the Offer or are properly withdrawn before the Expiration Time, or if less than all Shares evidenced by a shareholder's certificate(s) are tendered, we will return certificates for unpurchased Shares promptly after the expiration or termination of the Offer or proper withdrawal of the Shares, as applicable, or, in the case of Shares tendered by book-entry transfer at the Book-Entry Transfer Facility, the Shares will be credited to the appropriate account maintained by the tendering shareholder at the Book-Entry Transfer Facility, in each case without expense to the shareholder.

Determination of Validity. Rejection of Shares; Waiver of Defects; No Obligation to Give Notice of Defects. All questions as to the number of Shares to be accepted, the Final Purchase Price to be paid for Shares to be accepted and the validity, form, eligibility (including time of receipt) and acceptance for payment of any tender of Shares will be determined by us, in our sole discretion, and our determination will be final and binding on all parties. We reserve the absolute right to reject any or all tenders of any Shares that we determine are not in proper form or the acceptance for payment of or payment for which may, in the opinion of our counsel, be unlawful. We also reserve the absolute right to waive any of the conditions of the Offer on or prior to the Expiration Time, or any defect or irregularity in any tender with respect to any particular Shares or any particular shareholder (whether or not we waive similar defects or irregularities in the case of other shareholders), and our interpretation of the terms of the Offer will be final and binding on all parties. In the event a condition is waived with respect to any particular shareholder, the same condition will be waived with respect to all shareholders. No tender of Shares will be deemed to have been properly made until all defects or irregularities have been cured by the tendering shareholder or waived by us. We will not be liable for failure to waive any condition of the Offer, or any defect or irregularity in any tender of Shares. Neither we nor the Dealer Manager, the Depositary, the Information Agent or any other person will be obligated to give notice of any defects or irregularities in tenders, nor will any of the foregoing incur any liability for failure to give any such notification.

Tendering Shareholder's Representation and Warranty. Our Acceptance Constitutes an Agreement. It is a violation of Exchange Act Rule 14e-4 for a person, directly or indirectly, to tender Shares for that person's own account unless, at the time of tender and at the end of the proration period or period during which Shares are accepted by lot (including any extensions of such period), the person so tendering:

A tender of Shares in accordance with any of the procedures described above will constitute the tendering shareholder's acceptance of the terms and conditions of the Offer, as well as the tendering shareholder's representation and warranty to us that:

A tender of Shares made pursuant to any method of delivery set forth herein will also constitute a representation and warranty to us that the tendering shareholder has full power and authority to tender, sell, assign and transfer the Shares tendered, and that, when the same are accepted for purchase by us, we will acquire good, marketable and unencumbered title thereto, free and clear of all security interests, liens, restrictions, claims, encumbrances and other obligations relating to the sale or transfer of the Shares, and the same will not be subject to any adverse claim or right. Any such tendering shareholder will, on request by the Depositary or us, execute and deliver any additional documents deemed by the Depositary or us to be necessary or desirable to complete the sale, assignment and transfer of the Shares tendered, all in accordance with the terms of the Offer.

Our acceptance for payment of Shares tendered pursuant to the Offer will constitute a binding agreement between the tendering shareholder and us on the terms and subject to the conditions of the Offer.

All authority conferred or agreed to be conferred by delivery of the Letter of Transmittal shall be binding on the successors, assigns, heirs, personal representatives, executors, administrators and other legal representatives of the tendering shareholder and shall not be affected by, and shall survive, the death or incapacity of such tendering shareholder.

Lost, Destroyed or Stolen Certificates. Shareholders whose certificates for all or any portion of their Shares have been lost, destroyed or stolen may contact American Stock Transfer & Trust Company, LLC, the Depositary and transfer agent for the Shares, at one of its addresses set forth on the back cover of this Offer to Purchase or at the toll free number (877) 248-6417 for instructions to obtain a replacement certificate. To tender such Shares in the Offer, the replacement certificate will then be required to be submitted together with the Letter of Transmittal in order to receive payment for Shares that are tendered and accepted for payment. A bond may be required to be posted by the shareholder to secure against the risk that the certificates may be subsequently recirculated. The Letter of Transmittal and related documents cannot be processed until the procedures for replacing lost, destroyed or stolen certificates have been followed. Shareholders are requested to contact the Depositary immediately in order to permit timely processing of this documentation. Certificates for Shares, together with a properly completed Letter of Transmittal and any other documents required by the Letter of Transmittal, must be delivered to the Depositary and not to us, the Dealer Manager or the Information Agent. Any certificates delivered to us, the Dealer Manager or the Information Agent will not be forwarded to the Depositary and any Shares to which they relate will not be deemed to be properly tendered.

Backup Withholding. Under the United States federal income tax laws, payments to a tendering shareholder or other payee who is a U.S. Holder (as defined in Section 14) may be subject to "backup withholding" at the applicable statutory rate (currently 28%), unless a tendering shareholder or other payee:

A shareholder that does not provide a correct taxpayer identification number may be subject to penalties imposed by the Internal Revenue Service (the "IRS"). To prevent backup withholding on cash payable under the Offer, each shareholder should provide the Depositary with his or her correct taxpayer identification number and certify that he or she is not subject to backup withholding by completing the IRS Form W-9 included in the Letter of Transmittal. Certain "exempt recipients" (including, among others, all corporations and certain Non-U.S. Holders (as defined in Section 14)) are not subject to U.S. federal backup withholding tax. In order for a Non-U.S. Holder to qualify as an exempt recipient and avoid backup withholding, such Non-U.S. Holders must complete and sign the appropriate IRS Form W-8, a copy of which may be obtained from the Depositary or at www.irs.gov. See Section 14 and Instruction 10 to the Letter of Transmittal.

Backup withholding is not an additional tax. Taxpayers may use amounts withheld as a credit against their United States federal income tax liability or may claim a refund of such amounts if they timely provide certain required information to the IRS.

United States Federal Withholding Tax on Payments to Non-U.S. Holders. Non-U.S. Holders may be subject to a 30% United States federal withholding tax on payments received pursuant to the Offer. As described in Section 14, a sale of Shares pursuant to the Offer may qualify for sale or exchange treatment or may constitute a taxable dividend, depending on a particular shareholder's facts and circumstances. The Depositary generally will treat payments made to Non-U.S. Holders pursuant to the Offer as taxable dividends. Accordingly, in compliance with United States federal income tax laws, the Depositary will withhold 30% of the gross proceeds payable to a Non-U.S. Holder unless the holder provides the Depositary with (i) a properly executed IRS Form W-8BEN (or other applicable Form W-8) certifying that it is entitled to a reduced rate of withholding under an applicable tax treaty or (ii) a properly executed IRS Form W-8ECI certifying that it is exempt from withholding because the payment is effectively connected with the Non-U.S. Holder's conduct of a trade or business in the United States. A Non-U.S. Holder may be eligible to obtain a refund of all or a portion of any tax withheld if its sale of Shares pursuant to the Offer satisfies the requirements for sale or exchange treatment described in Section 14 or the Non-U.S. Holder is otherwise able to establish that no tax or a reduced amount of tax is due.

Non-U.S. Holders are urged to consult their tax advisors regarding the application of United States federal income tax withholding, including eligibility for a withholding tax reduction or exemption, and the refund procedure.

For a more complete discussion of U.S. federal income tax consequences to tendering Shareholders, see "Section 14—Certain United States Federal Income Tax Consequences."

Except as otherwise provided in this Section 4, tenders of Shares pursuant to the Offer are irrevocable. Shares tendered pursuant to the Offer may be withdrawn at any time before the Expiration Time and, unless we have accepted tendered Shares for payment in the Offer, may also be withdrawn at any time after 5:00 P.M., New York City time, on Tuesday, July 14, 2015.

For a withdrawal to be effective, a notice of withdrawal must be in written form and must be received in a timely manner by the Depositary at one of its addresses set forth on the back cover of this Offer to Purchase. Any notice of withdrawal must specify the name of the tendering shareholder, the number of Shares to be withdrawn, and the name of the registered holder of the Shares. If certificates for Shares to be withdrawn have been delivered to the Depositary, then, before the release of the certificates, the tendering shareholder must also submit the serial numbers shown on the

particular certificates for Shares to be withdrawn and the signature(s) on the notice of withdrawal must be guaranteed by an Eligible Institution (except in the case of Shares tendered for the account of an Eligible Institution). If Shares have been tendered pursuant to the procedure for book-entry transfer described in Section 3, the notice of withdrawal also must specify the name and the number of the account at the Book-Entry Transfer Facility to be credited with the withdrawn Shares and must otherwise comply with the Book-Entry Transfer Facility's procedures. If a shareholder has used more than one Letter of Transmittal or has otherwise tendered Shares in more than one group of Shares, the shareholder may withdraw Shares using either separate notices of withdrawal or a combined notice of withdrawal, so long as the information specified above is included.

We will determine all questions as to the form and validity, including the time of receipt, of any notice of withdrawal, in our sole discretion, which determination will be final and binding on all parties. Neither we nor the Dealer Manager, the Depositary, the Information Agent or any other person will be obligated to give notice of any defects or irregularities in any notice of withdrawal, nor will any of the foregoing incur liability for failure to give any such notification. Withdrawals may not be rescinded, and any Shares properly withdrawn will be deemed not properly tendered for purposes of the Offer. However, withdrawn Shares may be re-tendered before the Expiration Time by again following one of the procedures described in Section 3.

If we extend the Offer, are delayed in our purchase of Shares or are unable to purchase Shares pursuant to the Offer for any reason, then, without prejudice to our rights under the Offer, the Depositary may, subject to applicable law, retain tendered Shares on our behalf, and the Shares may not be withdrawn except to the extent tendering shareholders are entitled to withdrawal rights as described in this Section 4. Our reservation of the right to delay payment for Shares that we have accepted for payment is limited by Exchange Act Rule 13e-4(f)(5), which requires that we must pay the consideration offered or return the Shares tendered promptly after termination or withdrawal of the Offer.

On the terms and subject to the conditions of the Offer, promptly following the Expiration Time, we will:

For purposes of the Offer, we will be deemed to have accepted for payment (and therefore purchased), subject to the odd lot priority, proration and conditional tender provisions of the Offer, Shares that are properly tendered at or below the Final Purchase Price and not properly withdrawn only when, as and if we give oral or written notice to the Depositary of our acceptance of the Shares for payment pursuant to the Offer.

On the terms and subject to the conditions of the Offer, promptly after the Expiration Time, we will accept for purchase and pay a single per Share purchase price for all of the Shares accepted for payment in accordance with the Offer. In all cases, payment for Shares tendered and accepted for

payment in accordance with the Offer will be made promptly, subject to possible delay due to proration, but only after timely receipt by the Depositary of:

We will pay for Shares purchased pursuant to the Offer by depositing the aggregate purchase price for the Shares with the Depositary, which will act as agent for tendering shareholders for the purpose of receiving payment from us and transmitting payment to the tendering shareholders. In the event of proration, the Depositary will determine the proration factor and pay for those tendered Shares accepted for payment promptly after the Expiration Time. Certificates for all Shares tendered and not purchased, including all Shares tendered at prices in excess of the Final Purchase Price and Shares not purchased due to proration or conditional tenders, will be returned to the tendering shareholder, or, in the case of Shares tendered by book-entry transfer, will be credited to the account maintained with the Book-Entry Transfer Facility by the participant who delivered the Shares, promptly after the expiration or termination of the Offer at our expense.

Under no circumstances will interest be paid on the Final Purchase Price for the Shares, regardless of any delay in making payment. In addition, if certain events occur, we may not be obligated to purchase Shares pursuant to the Offer. See Section 7.

We will pay all stock transfer taxes, if any, payable on the transfer to us of Shares purchased pursuant to the Offer. If, however, payment of the Final Purchase Price is to be made to, or (in the circumstances permitted by the Offer) if unpurchased Shares are to be registered in the name of, any person other than the registered holder, or if tendered certificates are registered in the name of any person other than the person signing the Letter of Transmittal, the amount of all stock transfer taxes, if any (whether imposed on the registered holder or the other person), payable on account of the transfer to the person will be deducted from the Final Purchase Price unless satisfactory evidence of the payment of the stock transfer taxes, or exemption from payment of the stock transfer taxes, is submitted.

Subject to the exception for odd lot holders, in the event that the Offer is oversubscribed, Shares tendered at or below the Final Purchase Price prior to the Expiration Time will be subject to proration. See Section 1. As discussed in Section 14, the number of Shares to be purchased from a particular shareholder may affect the tax treatment of the purchase to the shareholder and the shareholder's decision whether to tender. Accordingly, a shareholder may tender Shares subject to the condition that a specified minimum number of the shareholder's Shares tendered pursuant to a Letter of Transmittal must be purchased if any Shares tendered are purchased. Any shareholder desiring to make a conditional tender must so indicate in the section captioned "Conditional Tender" in the Letter of Transmittal, and, if applicable, in the Notice of Guaranteed Delivery. We urge each shareholder to consult with his or her financial or tax advisor with respect to the advisability of making a conditional tender.

Any tendering shareholder wishing to make a conditional tender must calculate and appropriately indicate the minimum number of Shares that must be purchased from that shareholder if any are to be purchased. After the Offer expires, if, based on the Final Purchase Price determined in the Offer, Shares having an aggregate purchase price of more than $45 million (or such greater aggregate purchase price as we may elect, subject to applicable law) are properly tendered and not properly

withdrawn, so that we must prorate our acceptance of and payment for tendered Shares, we will calculate a preliminary proration percentage based upon all Shares properly tendered, conditionally or unconditionally. If the effect of this preliminary proration would be to reduce the number of Shares to be purchased from any shareholder below the minimum number specified, the conditional tender will automatically be regarded as withdrawn (except as provided in the next paragraph). All Shares tendered by a shareholder subject to a conditional tender pursuant to the Letter of Transmittal and regarded as withdrawn as a result of proration will be returned to the tendering shareholder at our expense promptly after the Expiration Time. After giving effect to these withdrawals, we will accept the remaining Shares properly tendered, conditionally or unconditionally, on a pro rata basis, if necessary.

If conditional tenders would otherwise be regarded as withdrawn and would cause the total number of Shares to be purchased to fall below an aggregate purchase price of $45 million (or such greater aggregate purchase price as we may elect, subject to applicable law) then, to the extent feasible, we will select enough of the conditional tenders that would otherwise have been deemed withdrawn to permit us to purchase Shares having an aggregate purchase price of $45 million (or such greater aggregate purchase price as we may elect, subject to applicable law). In selecting among the conditional tenders, we will select by random lot, treating all tenders by a particular taxpayer as a single lot, and will limit our purchase in each case to the designated minimum number of Shares to be purchased. To be eligible to have their Shares purchased by random lot, shareholders whose Shares are conditionally tendered must have tendered all of their Shares in the Offer, and so indicated by checking the appropriate box in the Letter of Transmittal.

The Offer is not conditioned on any minimum number of Shares being tendered. Notwithstanding any other provision of the Offer, we will not be required to accept for payment, purchase or pay for any Shares tendered, and may terminate or amend the Offer or may postpone the acceptance for payment of or the payment for Shares tendered, subject to Exchange Act Rule 13e-4(f)(5), which requires that we must pay the consideration offered or return the Shares tendered promptly after termination or withdrawal of the Offer, if any time on or after the commencement of the Offer and prior to the Expiration Time any of the following events have occurred that, in our reasonable judgment and regardless of the circumstances giving rise to the event or events (excluding any action or inaction by us), makes it inadvisable to proceed with the Offer or with acceptance for payment or payment for the Shares in the Offer:

The conditions referred to above are for our sole benefit and may be asserted by us regardless of the circumstances giving rise to any such condition (excluding any action or inaction by us), and may be waived by us, in whole or in part, at any time and from time to time in our discretion. Our failure at any time to exercise any of the foregoing rights will not be deemed a waiver of any right, and each such right will be deemed an ongoing right that may be asserted at any time and from time to time. However, once the Offer has expired, then all of the conditions of the Offer, other than those requiring receipt of necessary governmental approvals, must have been satisfied or waived. In certain circumstances, if we waive any of the conditions described above, we may be required to extend the Expiration Time. Any determination by us concerning the events described above will be final and binding on all parties. See Section 15.

The Shares are listed and traded on the NASDAQ under the trading symbol "EMKR." The following table sets forth, for the fiscal quarters indicated, the high and low sales prices of the Shares on the NASDAQ.



	HIGH		LOW
Fiscal Year Ended September 30, 2013
First Quarter	$	5.71	$	3.91
Second Quarter		6.75		4.36
Third Quarter		5.97		3.32
Fourth Quarter		4.84		3.59
Fiscal Year Ended September 30, 2014
First Quarter	$	5.62	$	4.33
Second Quarter		5.42		4.61
Third Quarter		5.30		3.50
Fourth Quarter		6.03		3.86
Fiscal Year Ended September 30, 2015
First Quarter	$	5.80	$	5.00
Second Quarter		5.60		5.10
Third Quarter (through May 5, 2015)		5.74		5.37

We have never declared or paid any dividends on the Shares. In addition, our credit and security agreement, as amended, with Wells Fargo Bank, National Association, currently prohibits distributions to our shareholders (other than distributions payable solely in our stock) and our board of directors is not currently able to predict the timing, amount or nature of, or the record dates for distributions, if any, to be made to our shareholders.

On May 5, 2015, the last full trading day before the announcement and commencement of the Offer, the last reported sale price of the Shares on the NASDAQ was $5.58 per Share. Shareholders are urged to obtain current market quotations for the Shares.

Assuming that the Offer is fully subscribed, the aggregate purchase price of Shares purchased in the Offer will be $45 million. We expect that the maximum aggregate cost of these purchases, including all fees and expenses applicable to the Offer, will be approximately $800,000. We intend to use cash on hand to purchase Shares in the Offer and to pay all related fees and expenses.

Our Business. EMCORE Corporation and its subsidiaries offers a broad portfolio of compound semiconductor-based products for the fiber optics market. We were established in 1984 as a New Jersey corporation and we have one reporting segment: Fiber Optics. EMCORE's Fiber Optics business provides optical components, subsystems and systems for high-speed telecommunications, Cable Television (CATV), Wireless and Fiber-To-The-Premises (FTTP) networks, as well as products for

satellite communications, video transport and specialty photonics technologies for defense and homeland security applications.

EMCORE's Solar Photovoltaics business, which was sold in December 2014, provided products for space power applications including high-efficiency multi-junction solar cells, Covered Interconnect Cells (CICs) and complete satellite solar panels. We also sold our Digital Products business in January 2015, which included the ITLA, micro-ITLA, T-TOSA and T-XFP product lines within the Company's telecommunications business.

In addition to organic growth and development of our existing Fiber Optics market, we intend to pursue other strategies to enhance shareholder value, which may include issuing dividends, acquisitions, investments in joint ventures, partnerships, and other strategic alternatives, such as dispositions, reorganizations, recapitalizations or other similar transactions. Accordingly, the Strategy and Alternatives Committee of the Board and our management may from time to time be engaged in evaluating potential strategic opportunities and may enter into definitive agreements with respect to, such transactions or other strategic alternatives.

We utilize MOCVD (metal-organic chemical vapor deposition) systems that are capable of processing virtually all compound semiconductor-based materials. Our operations include wafer fabrication, device design and production, fiber optic module, subsystem and system design and manufacture, and solar panel engineering and assembly. Many of our manufacturing operations are computer monitored or controlled to enhance production output and statistical control. We employ a strategy of minimizing ongoing capital investments, while maximizing the variable nature of our cost structure. We maintain supply agreements with key suppliers. Where we can gain cost advantages while maintaining quality and intellectual property control, we outsource the production of certain products, subsystems, components, and subassemblies to contract manufacturers located overseas. Our contract manufacturers maintain comprehensive quality assurance and delivery systems, and we continuously monitor them for compliance.

Our research and development efforts have been focused on maintaining our technological competitive edge by working to improve the quality and features of our product lines. We are also making investments to expand our existing technology and infrastructure in an effort to develop new products and production technology that we can use to expand into new markets. Our industry is characterized by rapid changes in process technologies with increasing levels of functional integration. Our efforts are focused on designing new proprietary processes and products, on improving the performance of our existing materials, components, and subsystems, and on reducing costs in the product manufacturing process.

We sell our products worldwide through our direct sales force, third party sales representatives and distributors, and application engineers. Our sales force communicates with our customers' engineering, manufacturing, and purchasing personnel to determine product design, qualifications, performance, and price. Our strategy is to use our direct sales force to sell to key accounts and to expand our use of third party sales representatives for increased coverage in international markets and certain domestic segments.

Availability of Reports and Other Information. We are subject to the informational filing requirements of the Exchange Act, which obligates us to file reports, statements and other information with the SEC relating to our business, financial condition and other matters. Information, as of particular dates, concerning our directors and officers, their remuneration, options and other equity awards granted to them, the principal holders of our securities and any material interest of these persons in transactions with us is required to be disclosed in proxy statements distributed to our shareholders and filed with the SEC. As required by Exchange Act Rule 13e-4(c)(2), we have also filed with the SEC a Tender Offer Statement on Schedule TO (the "Schedule TO"), which includes additional information relating to the Offer.

These reports, statements and other information can be inspected and copied at the public reference facilities maintained by the SEC at 100 F Street, N.E., Washington, D.C. 20549. Copies of this material may also be obtained by mail, upon payment of the SEC's customary charges, from the Public Reference Section of the SEC at 100 F Street, N.E., Washington, D.C. 20549. The SEC also maintains a website on the Internet at www.sec.gov that contains reports, proxy and information statements and other information regarding registrants that file electronically with the SEC, including the Schedule TO and documents incorporated by reference. You may obtain information about the Public Reference Room by calling the SEC for more information at 1-800-SEC-0330.

Incorporation by Reference. The rules of the SEC allow us to "incorporate by reference" information into this Offer to Purchase, which means that we can disclose important information to you by referring you to another document filed separately with the SEC. We incorporate by reference each of the following documents (other than any portions of the respective filings that were furnished to, rather than filed with, the SEC under applicable SEC rules):




		SEC Filings				Date Filed

		Annual Report on Form 10-K for the fiscal year ended September 30, 2014				December 12, 2014

		Definitive Proxy Statement on Schedule 14A				January 20, 2015

		Quarterly Report on Form 10-Q				May 6, 2015; February 13, 2015

		Current Reports on Form 8-K				May 6, 2015; May 6, 2015; April 21, 2015; March 11, 2015; February 12, 2015; January 8, 2015; January 5, 2015; December 19, 2014; December 16, 2014; December 11, 2014; December 11, 2014; December 10, 2014; December 5, 2014; November 26, 2014; October 24, 2014; October 22, 2014

Any statement contained in any document incorporated by reference into this Offer to Purchase shall be deemed to be modified or superseded to the extent that an inconsistent statement is made in this Offer to Purchase or any subsequently filed document. Any statement so modified or superseded shall not be deemed, except as so modified or superseded, to constitute a part of this Offer to Purchase.

You can obtain any of the documents incorporated by reference in this Offer to Purchase from us or from the SEC's website at the address described above. Documents incorporated by reference, including any exhibits to those documents, are available from us without charge at our principal executive office located at 2015 W. Chestnut Avenue, Alhambra, California 91803. Our main telephone number is (626) 293-3400. Please be sure to include your complete name and address in your request. If you request any incorporated documents, we will promptly mail them to you by first class mail, or another equally prompt means. You may also find additional information by visiting our website at http://www.emcore.com. Our website and the information posted on it or connected to it do not form part of the Offer and are not incorporated by reference in this Offer to Purchase.

11. Interests of Directors and Executive Officers; Transactions and Arrangements Concerning the Shares.

Beneficial Ownership. As of May 1, 2015 we had 32,296,486 issued and outstanding Shares. We are offering to purchase Shares up to an aggregate purchase price of $45 million. At the maximum Final Purchase Price of $6.75 per Share, we could purchase 6,666,666 Shares if the Offer is fully subscribed, which would represent approximately 20.64% of the issued and outstanding Shares as of

May 1, 2015. At the minimum Final Purchase Price of $6.25 per Share, we could purchase 7,200,000 Shares if the Offer is fully subscribed, which would represent approximately 22.29% of the issued and outstanding Shares as of May 1, 2015.

OWNERSHIP OF SECURITIES

SECURITY OWNERSHIP OF
CERTAIN BENEFICIAL OWNERS AND MANAGEMENT

The following table sets forth as of April 1, 2015 certain information regarding the beneficial ownership of Common Stock of the Company by: (i) each Named Executive Officer of the Company, (ii) each director and nominee, (iii) all directors and executive officers as a group (7 persons), and (iv) each person or "group" (as that term is defined in Section 13(d)(3) of the Exchange Act) known by the Company to be the beneficial owner of more than 5% of the Common Stock of the Company. Except as otherwise indicated, the Company believes, based on information furnished by such persons, that each person listed below has the sole voting and investment power over the shares of Common Stock shown as beneficially owned, subject to common property laws, where applicable. Shares beneficially owned include shares of Common Stock and warrants and options to acquire shares of Common Stock that are exercisable within sixty (60) days of April 1, 2015, and phantom share credits representing shares of Common Stock earned by directors for services on the Board that such directors have elected to defer and which will be settled in Common Stock upon a change of control or after such directors' termination of service as a director of the Company. Unless otherwise indicated, the address of each of the beneficial owners is c/o EMCORE Corporation, 2015 W. Chestnut Street, Alhambra, California 91803.

Name

Robert L. Bogomolny	98,019	(2)	*
Steven Becker	3,204,681	(3)(4)	9.93
Gerald J. Fine, Ph.D.	18,939		*
Charles T. Scott	81,193	(5)	*
Stephen L. Domenik	7,576		*
Mark Weinswig	187,394	(6)	*
Jeffrey Rittichier	45,031	(7)	*
All directors and executive officers as a group (7 persons)	3,642,833	(8)	11.27	%
Thomas J. Russell, Ph.D.	1,719,717	(9)	5.33	%
Becker Drapkin Management, L.P.	3,197,105	(3)	9.91	%
Kopp Investment Advisors, LLC	2,073,975	(11)	6.43	%
Nokomis Capital	2,305,869	(10)	7.15	%

(1): As of April 1, 2015, 32,261,813 shares of Common Stock were outstanding.
(2): Includes 15,497 phantom share credits, representing shares of Common Stock earned by Mr. Bogomolny for services rendered as a director, which he elected to defer.
(3): This formation is based on information contained in a Schedule 13 D/A filed with the SEC on December 6, 2013 and in a Form 4 filed on December 10, 2013. According to the Schedule 13D/A and Form 4, Becker Drapkin Partners (QP), L.P. ("Becker Drapkin QP") owns 2,077,849 shares of Common Stock (the "Becker Drapkin QP Shares"), and Becker Drapkin Partners, L.P. ("Becker Drapkin, L.P.") owns 292,742 shares of Common Stock (the "Becker Drapkin, L.P. Shares"). The Becker Drapkin QP Shares and Becker Drapkin, L.P. Shares are collectively referred to herein as the "Becker Drapkin Funds Shares." Becker Drapkin QP has the power to vote or to direct the vote of (and the power to dispose or direct the disposition of) the Becker Drapkin QP Shares. Becker Drapkin QP disclaims beneficial ownership of the Becker Drapkin, L.P. Shares. Becker Drapkin, L.P. has the power to vote or to direct the vote of (and the power to dispose or direct the disposition of) the Becker Drapkin, L.P. Shares. Becker Drapkin, L.P. disclaims beneficial ownership of the Becker Drapkin QP Shares. As general partner of the Becker Drapkin Funds, Becker Drapkin Management, L.P. ("BD Management") may be deemed to have the shared power to vote or direct the vote of (and the shared power to dispose or direct the disposition of) the Becker Drapkin Funds Shares. BD Management in its capacity as investment manager for a separate managed account on behalf of an investment advisory client (the "Managed Account") has the sole power to vote or direct the vote of (and the sole power to dispose or direct the disposition of) 826,514 shares held by the Managed Account (the "Managed Account Shares"). BC Advisors, LLC ("BCA"), as the general partner of BD Management, and Mr. Becker and Matthew A. Drapkin, as the sole members and co-managing members of BCA and limited partners of BD Management, may in each case be deemed to be beneficial owners of the Becker Drapkin Funds Shares and the Managed Account Shares. BD Management disclaims beneficial ownership of the Becker Drapkin Funds Shares. BCA does not own any shares directly and disclaims beneficial ownership of any shares beneficially owned by BD Management. Mr. Becker and Matthew A. Drapkin each disclaim beneficial ownership of any shares beneficially owned by BCA.
(4): Includes 7,576 shares of Common Stock earned by Mr. Becker for services rendered as a director.
(5): Includes 22,265 phantom share credits, representing shares of Common Stock earned by Mr. Scott for services rendered as a director, which he elected to defer, and 34,125 shares of Common Stock owned by Kircal, Ltd.
(6): Includes options to purchase 75,000 shares of Common Stock exercisable within 60 days of April 1, 2015, and 7,826 shares of Common Stock held in the Company's 401(k) Plan as of March 31, 2015.
(7): Includes 69 shares of Common Stock held in the Company's 401(k) Plan as of March 31, 2015.
(8): Includes 75,000 shares of Common Stock exercisable within 60 days of April 1, 2015.
(9): Includes 856,016 shares of Common Stock held by The Morning Star Trust for the benefit of Dr. Russell's daughter.
(10): This information is based solely on information contained in a Schedule 13D filed with the SEC on February 13, 2015, by Nokomis Capital, LLC ("Nokomis") and Mr. Brett Hendrickson, the principal of Nokomis. Nokomis reports beneficially owning a total of 2,305,869 shares of Common Stock including having sole voting power over 0 shares of Common Stock and shared voting and dispositive power over 2,305,869 shares of Common Stock. The address of Nokomis is 2305 Cedar Springs Rd., Suite 420, Dallas, Texas 75201.
(11): This information is based solely on information contained in a Schedule 13D filed with the SEC on October 8, 2010, by Kopp Investment Advisors, LLC ("KIA"), a wholly-owned subsidiary of

Kopp Holding Company, LLC ("KHC"), which is controlled by Mr. LeRoy C. Kopp ("Kopp") (collectively, the "Kopp Parties"). KIA reports beneficially owning a total of 2,073,975 shares of Common Stock including having sole voting power over 0 shares of Common Stock and shared dispositive power over 735,225 shares of Common Stock. KHC reports beneficially owning 2,073,975 shares of Common Stock including having sole voting power over 0 shares of Common Stock and shared dispositive power over 735,225 shares of Common Stock. Kopp reports beneficially owning a total of 2,073,975 shares of Common Stock including having sole voting power over 1,338,750 shares of Common Stock and shared dispositive power over 735,225 shares of Common Stock. All share ownership numbers have been adjusted to account for a reverse stock split effected by the Company at a ratio of 4:1 on February 15, 2012. The address of the Kopp Parties is 8400 Normandale Lake Blvd., Suite 1450, Bloomington, Minnesota 55437.

As of December 31, 2014, there were 1,145,183 shares remaining available for grant under the Equity Plans.

Most of our stock options vest and become exercisable over a four to five year period and have a contractual life of 10 years. Certain stock options awarded are intended to qualify as incentive stock options pursuant to Section 422A of the Internal Revenue Code. As of December 31, 2014, there were 1,336,237 options outstanding under the Equity Plans.

Restricted stock units (RSUs) granted under the 2010 Equity Plan and 2012 Equity Plan typically vest over 3 years and are subject to forfeiture if employment terminates prior to the lapse of the restrictions. RSUs are not considered issued or outstanding common stock until they vest. As of December 31, 2014, there were 522,179 RSUs outstanding under the Equity Plans.

401(k) Plan. We have a savings plan that qualifies as a deferred salary arrangement under Section 401(k) of the Internal Revenue Code. Under this savings plan, participating employees, including the Company's executive officers, may defer a portion of their pretax earnings, up to the Internal Revenue Service annual contribution limit. All employer contributions are made in common stock. For the fiscal year ended September 30, 2014, we contributed approximately $1.0 million in common stock to the savings plan. As of December 31, 2014, approximately 678,391.574 shares were held in accounts under the 401(k) Plan.

Employee Stock Purchase Plan. We offer all eligible employees, including the Company's executive officers, the opportunity to acquire an ownership interest in the Company by purchasing Shares through a tax-qualified employee stock purchase plan ("ESPP"). Under the ESPP, an employee can withhold, through payroll deductions, up to 10% of his/her earnings, up to certain maximums, to be used to purchase Shares at certain plan-defined dates. The option price is set at 85% of the average of the high and low price for Shares on either the first or last day of the offering period, whichever is lower. As of December 31, 2014, the total amount of common stock issued under the ESPP totaled 2,154,791 shares, and the number of shares available for grant was 1,092,983.

Officer and Director Share Purchase Plan. We have an Officer and Director Share Purchase Plan (ODPP), which allows executive officers and directors of the Company to purchase Shares at fair market value in lieu of salary or, in the case of directors, director fees. Eligible individuals may voluntarily participate in the ODPP by authorizing payroll deductions or, in the case of directors, deductions from director fees for the purpose of purchasing Shares. Elections to participate in the ODPP may only be made during open trading windows under the Company's insider trading policy when the participant does not otherwise possess material non-public information concerning the Company. The Board of Directors has authorized 125,000 Shares to be made available for purchase by officers and directors under the ODPP. As of December 31, 2014, 36,259 Shares had been purchased under the ODPP and 88,741 shares remained available for grant.

Director Equity Compensation. Each non-employee director receives an annual award of Shares in an amount equal to $40,000, provided that in the event a person serves as a non-employee director for less than a full plan year, such amount is prorated based on the number of whole calendar months the director served as a non-employee director during the plan year.

Potential Payments upon Termination or Change in Control. Each of our executive officers has entered into employment agreements setting forth, among other things, the acceleration and immediate vesting of all the executive officer's outstanding equity awards that remain subject to vesting (except performance-based awards) if the executive officer's employment is terminated without cause, the executive officer terminates his employment for good reason, or within thirty-six months of a change in control of the Company, the executive officer's employment is terminated without cause or the executive officer terminates his employment for good reason.

The foregoing descriptions of agreements and arrangements involving the Shares are qualified in their entirety by reference to the text of the respective agreements and arrangements, copies of which have been filed with the SEC.

General. Except as otherwise described or incorporated by reference in this Offer to Purchase or the Schedule TO, neither we nor, to the best of our knowledge, any of our affiliates, directors or executive officers, is a party to any contract, agreement, arrangement, understanding or relationship with any other person with respect to any of our securities.

12. Effects of the Offer on the Market for Shares; Registration Under the Exchange Act

The purchase by us of Shares pursuant to the Offer will reduce the number of Shares that might otherwise be traded publicly and is likely to reduce the number of our shareholders and may decrease the liquidity of the market for Shares. As a result, trading of a relatively small volume of the Shares after consummation of the Offer may have a greater impact on trading prices than would be the case prior to consummation of the Offer.

We believe that there will be a sufficient number of Shares outstanding and publicly traded following completion of the Offer to ensure a continued trading market for the Shares. Based upon published guidelines of the NASDAQ, we do not believe that our purchase of Shares under the Offer will cause the remaining outstanding Shares to be delisted from the NASDAQ. The Offer is conditioned upon, among other things, our determination that the consummation of the Offer and the purchase of Shares will not cause the Shares to be delisted from the NASDAQ. See Section 7.

The Shares are registered under the Exchange Act, which requires, among other things, that we furnish certain information to our shareholders and the SEC and comply with the SEC's proxy rules in connection with meetings of our shareholders. We believe that our purchase of Shares under the Offer pursuant to the terms of the Offer will not result in the Shares becoming eligible for deregistration under the Exchange Act.

It is a condition of our obligation to purchase Shares pursuant to the Offer that as a result of the consummation of the Offer, there not be a reasonable likelihood that the Shares will be delisted from the NASDAQ or will be eligible for deregistration under the Exchange Act.

We are not aware of any license or regulatory permit that is reasonably likely to be material to our business that might be adversely affected by our acquisition of Shares as contemplated in the Offer or of any approval or other action by any government or governmental, administrative or regulatory authority or agency, domestic, foreign or supranational, that would be required for our acquisition or ownership of Shares as contemplated by the Offer. Should any approval or other action be required, we presently contemplate that we will seek that approval or other action, but we have no current intention to delay the purchase of Shares tendered pursuant to the Offer pending the outcome of any such matter, subject to our right to decline to purchase Shares if any of the conditions in Section 7 have occurred or have not been waived. We cannot predict whether we would be required to delay the acceptance for payment of or payment for Shares tendered pursuant to the Offer pending the outcome of any such matter. We cannot assure you that any approval or other action, if needed, would be obtained or would be obtained without substantial cost or conditions or that the failure to obtain the approval or other action might not result in adverse consequences to our business and financial condition. If certain types of adverse actions are taken with respect to the matters discussed above, or certain approvals, consents, licenses or permits identified above are not obtained, we can decline to accept for payment or pay for any Shares tendered. See Section 7.

The following summary describes certain material United States federal income tax consequences of the Offer to shareholders whose Shares are properly tendered and accepted for payment pursuant to the Offer. Those shareholders who do not participate in the Offer will not incur any United States federal income tax liability as a result of the Offer. This summary addresses only Shares held as "capital assets" within the meaning of Section 1221 of Code (generally, property held for investment). This summary does not address special situations including, without limitation, those of financial institutions, brokers, dealers or traders in securities or commodities, insurance companies, regulated investment companies, real estate investment trusts, "S" corporations, partnerships or other pass-through entities (including entities treated as such for United States federal income tax purposes), United States expatriates, tax-exempt organizations, tax-qualified retirement plans, persons who are subject to alternative minimum tax, persons who hold Shares as a position in a "straddle" or as part of a "hedging," "conversion" or "integrated" transaction, United States persons that have a functional currency other than the United States dollar, controlled foreign corporations, passive foreign investment companies or persons who acquired Shares through the exercise of employee stock options or otherwise as compensation for services.

This summary does not address all aspects of United States federal income taxation and does not deal with all tax consequences that may be relevant to shareholders in light of their particular circumstances. Furthermore, this summary is based upon the provisions of the Code, the existing and proposed United States Treasury regulations promulgated thereunder and administrative and judicial interpretations thereof, all as of the date hereof, and such authorities may be repealed, revoked, modified or subject to differing interpretations, possibly with retroactive effect, so as to result in United States federal income tax consequences different from those discussed below. This summary does not address any state, local or foreign tax consequences, or any United States federal tax consequences other than United States federal income tax consequences.

If a partnership (including any entity treated as a partnership for United States federal income tax purposes) is a shareholder, the tax treatment of a partner in the partnership will generally depend upon

the status of the partner and the activities of the partnership. A shareholder that is a partnership, and partners in such partnership, should consult their tax advisors regarding the tax consequences of participating in the Offer.

THIS SUMMARY IS FOR GENERAL INFORMATION ONLY AND IS NOT INTENDED TO CONSTITUTE A COMPLETE DESCRIPTION OF ALL TAX CONSEQUENCES RELATING TO THE OFFER. SHAREHOLDERS ARE URGED TO CONSULT THEIR TAX ADVISORS REGARDING THE TAX CONSEQUENCES TO THEM (INCLUDING THE APPLICATION AND EFFECT OF ANY STATE, LOCAL AND FOREIGN INCOME AND OTHER TAX LAWS) OF THE OFFER.

The following is a summary of the United States federal income tax consequences that will apply to a U.S. Holder of Shares exchanged pursuant to the Offer. For purposes of this summary, a "U.S. Holder" is a beneficial owner of Shares that for United States federal income tax purposes is:

An exchange of Shares for cash by a U.S. Holder pursuant to the Offer will be a taxable transaction for U.S. federal income tax purposes. The U.S. federal income tax consequences to a U.S. Holder may vary depending upon the U.S. Holder's particular facts and circumstances. If an exchange of Shares for cash by a U.S. Holder pursuant to the Offer satisfies one of the three tests discussed below (the "Section 302 tests") and is treated as a sale or exchange of such Shares for U.S. federal income tax purposes, the U.S. Holder will generally recognize capital gain or loss in an amount equal to the difference between the amount of cash received and the U.S. Holder's adjusted tax basis in the Shares purchased by us. Such gain or loss will be long-term capital gain or loss if the U.S. Holder's holding period for the Shares at the time of the exchange exceeds one year. Specific limitations may apply to the deductibility of capital losses by a U.S. Holder. A U.S. Holder must calculate gain or loss separately for each block of Shares (generally, Shares acquired at the same cost in a single transaction). A U.S. Holder may be able to designate which blocks of Shares it wishes to tender and the order in which different blocks will be purchased in the event that less than all of its Shares are tendered.

An exchange of Shares for cash by a U.S. Holder pursuant to the Offer will be treated as a sale or exchange for U.S. federal income tax purposes if the (i) receipt of cash is "not essentially equivalent to a dividend" with respect to the U.S. Holder, (ii) exchange results in a "substantially disproportionate" reduction in the U.S. Holder's equity interest in us, or (iii) exchange results in a "complete redemption" of the U.S. Holder's equity interest in us. In determining whether any of these tests has been met, a U.S. Holder generally must take into account not only Shares it actually owns, but also Shares it constructively owns as determined under section 318 of the Code (including Shares that may be acquired through options that it owns or Shares held by certain members of the U.S. Holder's family). The rules of constructive ownership are complex and each U.S. Holder is urged to consult with its tax advisor regarding the application of such rules.

An exchange of Shares for cash by a U.S. Holder pursuant to the Offer will be treated as "not essentially equivalent to a dividend" if it results in a "meaningful reduction" in the U.S. Holder's stock interest in us. Whether such a meaningful reduction of the U.S. Holder's stock interest in us results will depend on the U.S. Holder's particular facts and circumstances. If, as a result of an exchange of Shares for cash pursuant to the Offer, a U.S. Holder whose relative stock interest in us is minimal (for example, less than 1%) and who exercises no control over our corporate affairs suffers any reduction in its proportionate stock interest (including any Shares constructively owned), the U.S. Holder generally should be regarded as having suffered a meaningful reduction in its stock interest in us.

Satisfaction of the "substantially disproportionate" test or "complete redemption" test is dependent upon satisfaction of the respective objective tests set forth in section 302(b)(2) and section 302(b)(3) of the Code. An exchange of Shares for cash by a U.S. Holder pursuant to the Offer will satisfy the "substantially disproportionate" test if (i) the percentage of such holder's outstanding voting stock in us actually and constructively owned immediately following the exchange is less than 80% of the percentage of the outstanding voting stock actually and constructively owned by the U.S. Holder immediately before the exchange, (ii) the percentage of the outstanding Shares actually and constructively owned by the U.S. Holder immediately following the exchange is less than 80% of the percentage of the outstanding Shares actually and constructively owned by the U.S. Holder immediately before the exchange, and (iii) immediately following the exchange, the U.S. Holder actually and constructively owns less than 50% of the total combined voting power in us. An exchange of Shares for cash by a U.S. Holder pursuant to the Offer will result in a "complete redemption" if either (i) all of the Shares actually and constructively owned by the U.S. Holder are exchanged for cash pursuant to the Offer or (ii) all of the Shares actually owned by the U.S. Holder are exchanged for cash pursuant to the Offer and the U.S. Holder timely and properly waives the attribution of Shares constructively owned by the U.S. Holder in accordance with the procedures described in section 302(c)(2) of the Code and the Treasury Regulations promulgated thereunder.

If a U.S. Holder's exchange of Shares for cash pursuant to the Offer does not constitute a sale or exchange for U.S. federal income tax purposes, the receipt of cash by such U.S. Holder pursuant to the Offer will be treated as a distribution, and the U.S. Holder's tax basis in the Shares exchanged generally will be added to any Shares retained by the U.S. Holder. The distribution will be treated as a dividend to the extent of our current and accumulated earnings and profits, as determined under U.S. federal income tax principles. To the extent that the amount of the distribution exceeds our current and accumulated earnings and profits, the excess first will be treated as a return of capital that will reduce the U.S. Holder's adjusted tax basis in its Shares, and any remaining portion will be taxable as capital gain. Any such capital gain will be long-term capital gain if the U.S. Holder's holding period for the Shares at the time of the exchange exceeds one year. Provided that minimum holding period requirements and other requirements are met, dividend income with respect to non-corporate U.S. Holders (including individuals) currently is eligible for a reduced rate of U.S. federal income taxation. If an exchange of Shares for cash pursuant to the Offer by a corporate U.S. Holder is treated as a dividend, the corporate U.S. Holder may be (i) eligible for a dividends received deduction (subject to applicable exceptions and limitations) and (ii) subject to the "extraordinary dividend" provisions of section 1059 of the Code. Corporate U.S. Holders are urged to consult their own tax advisors regarding (i) whether a dividends received deduction will be available to them and (ii) the application of section 1059 of the Code in connection with the Offer.

We cannot predict whether a particular U.S. Holder will be subject to sale or exchange treatment or distribution treatment. If the Offer is over-subscribed, our purchase of Shares properly tendered by a U.S. Holder may be pro-rated. Thus, even if all of the Shares actually and constructively owned by a U.S. Holder are properly tendered, it is possible that not all of the Shares will be purchased by us, which in turn may affect the U.S. Holder's ability to satisfy one of the Section 302 tests described above. Accordingly, a tendering U.S. Holder may choose to submit a "conditional tender" under the procedures described in Section 6, which allows the U.S. Holder to tender Shares subject to the

condition that a specified minimum number of the U.S. Holder's Shares must be purchased by us if any Shares so tendered are purchased.

The following is a summary of the United States federal income tax consequences that will apply to a Non-U.S. Holder of Shares exchanged pursuant to the Offer. A "Non-U.S. Holder" is a beneficial owner of Shares that is not a U.S. Holder.

The United States federal income tax treatment of our purchase of Shares from a Non-U.S. Holder pursuant to the Offer will depend on whether such holder is treated, based on the Non-U.S. Holder's particular circumstances, as having sold the tendered Shares or as having received a distribution in respect of such Non-U.S. Holder's Shares. The appropriate treatment of the purchase of Shares will be determined in the manner described above with respect to the United States federal income tax treatment of a purchase of Shares pursuant to the Offer in the case of U.S. Holders (see "Consequences of the Offer to U.S. Holders").

If a Non-U.S. Holder's sale of Shares pursuant to the Offer qualifies as a sale or exchange under any of the Section 302 tests described above, then any gain or loss recognized on the sale will be capital gain or loss. Any capital gain recognized by a Non-U.S. Holder will not be subject to U.S. federal income tax unless (i) such gain is "effectively connected" with a trade or business carried on in the United States by the Non-U.S. Holder (and if an income tax treaty applies, is attributable to a U.S. permanent establishment of the Non-U.S. Holder within the United States) or (ii) the Non-U.S. Holder is an individual who is physically present in the United States for 183 days or more during the taxable year of the sale and certain other conditions are met.

If a Non-U.S. Holder does not satisfy any of the Section 302 tests described above, amounts received by such Non-U.S. Holder pursuant to the Offer will be treated as a distribution to the Non-U.S. Holder with respect to such Non-U.S. Holder's Shares. In general, any amount that constitutes a dividend for U.S. federal income tax purposes will be subject to U.S. withholding tax at a rate of 30% (or a reduced rate prescribed by an applicable income tax treaty) unless the dividend is effectively connected with a trade or business carried on by the Non-U.S. Holder within the United States (and, if an income tax treaty applies, is attributable to a permanent establishment of the Non-U.S. Holder within the United States), in which case such dividend generally will be subject to U.S. federal income tax on a net income basis, in the same manner as if the Non-U.S. Holder were a resident of the United States. A Non-U.S. Holder that is a corporation may be subject to an additional "branch profits tax" at a rate of 30% (or such lower rate as may be specified by an applicable income tax treaty) with respect to any effectively connected income.

Withholding For Non-U.S. Holders. Because, as described above, we cannot predict whether any particular shareholder will be subject to sale or distribution treatment, the Depositary generally will treat the cash received by a Non-U.S. Holder participating in the Offer as a dividend distribution from us. Accordingly, the Depositary generally will withhold United States federal income taxes equal to 30% of the gross proceeds payable to the Non-U.S. Holder or his or her agent, unless (i) an exemption from, or a reduced rate of, withholding tax is available under a tax treaty or such gross proceeds are effectively connected with the conduct of a trade or business of the Non-U.S. Holder within the United States and (ii) the shareholder so certifies on the appropriate IRS Form W-8 as described below. In order to obtain a reduced rate of withholding under a tax treaty, a Non-U.S. Holder must deliver to the Depositary before the payment a properly completed and executed IRS Form W-8BEN (or suitable successor or substitute form). In order to obtain an exemption from withholding on the grounds that the gross proceeds paid under the Offer are effectively connected with the conduct of a trade or business within the United States, a Non-U.S. Holder must deliver to the Depositary a properly completed and executed IRS Form W-8ECI (or suitable successor or substitute form). If tax is withheld, a Non-U.S. Holder may be eligible to obtain a refund of all or a portion of such tax withheld

if such Non-U.S. Holder satisfies one of the Section 302 tests described above or is otherwise able to establish that no withholding or a reduced amount of withholding is due. Backup withholding generally will not apply to amounts subject to the 30% or treaty-reduced rate of United States federal income tax withholding.

Non-U.S. Holders may be subject to income tax on the sale of Shares pursuant to the Offer, even if such holders would not be subject to tax if those same Shares were sold on the open market. In addition, Non-U.S. Holders may be subject to a 30% withholding tax on the sale of Shares pursuant to the Offer, even if the transaction is not subject to income tax. Non-U.S. Holders are urged to consult their tax advisors regarding the United States federal income tax consequences of participation in the Offer, including the application of United States federal income tax withholding rules, eligibility for a reduction of or an exemption from withholding tax, and the refund procedure.

Payments made to holders in the Offer may be reported to the IRS. In addition, under the United States federal income tax laws, the Depositary will be required to backup withhold at the applicable statutory rate (currently 28%) on the purchase price paid to certain shareholders who are not "exempt recipients" pursuant to the Offer. To avoid such backup withholding, each such U.S. Holder must provide the Depositary with such shareholder's taxpayer identification number and certify that such shareholder is not subject to backup withholding by completing the IRS Form W-9 in the Letter of Transmittal or otherwise establish to the satisfaction of the Depositary that such shareholder is not subject to backup withholding. Certain exempt recipients (including, among others, all corporations and certain Non-U.S. Holders) are not subject to these backup withholding requirements. For a Non-U.S. Holder to qualify for such exemption, such Non-U.S. Holder must submit an IRS Form W-8BEN (or other applicable IRS W-8 Form), signed under penalties of perjury, attesting to such Non-U.S. Holder's exempt status.

Backup withholding is not an additional tax. Any amounts withheld under the backup withholding rules will be refunded or credited against the shareholder's United States federal income tax liability if certain required information is furnished to the IRS. Shareholders should consult their tax advisors regarding application of backup withholding in their particular circumstances and the availability of, and procedure for obtaining, an exemption from backup withholding under current U.S. Treasury Regulations.

We expressly reserve the right, in our sole discretion and subject to applicable law, at any time and from time to time, and regardless of whether any of the events set forth in Section 7 have occurred or shall be deemed by us to have occurred, to extend the period of time the Offer is open and delay acceptance for payment of, and payment for, any Shares by giving oral or written notice of such extension to the Depositary and making a public announcement of such extension. During any such extension, all Shares previously tendered and not properly withdrawn will remain subject to the Offer and to the rights of a tendering shareholder to withdraw such shareholder's Shares.

We also expressly reserve the right, in our sole discretion, not to accept for payment and not to pay for any Shares not previously accepted for payment or paid for, subject to applicable law, to postpone payment for Shares or to terminate the Offer upon the occurrence of any of the conditions specified in Section 7 by giving oral or written notice of the termination or postponement to the Depositary and making a public announcement of the termination or postponement. Our reservation of the right to delay payment for Shares that we have accepted for payment is limited by Exchange Act Rule 13e-4(f)(5), which requires that we must pay the consideration offered or return the Shares tendered promptly after termination or withdrawal of the Offer.

Subject to compliance with applicable law, we further reserve the right, in our reasonable discretion and regardless of whether any of the events set forth in Section 7 have occurred, to amend the Offer in any respect, including, without limitation, by changing the per Share purchase price range or by increasing or decreasing the aggregate purchase price of Shares sought in the Offer. Amendments to the Offer may be made at any time and from time to time by public announcement of the amendment. In the case of an extension, the announcement of the amendment shall be issued no later than 9:00 a.m., New York City time, on the next business day after the last previously scheduled or announced Expiration Time. Any public announcement made pursuant to the Offer will be disseminated promptly to shareholders in a manner reasonably designed to inform shareholders of the change. Without limiting the manner in which we may choose to make a public announcement, except as required by applicable law, we will have no obligation to publish, advertise or otherwise communicate any public announcement other than by issuing a press release to the Dow Jones News Service or comparable service.

If we materially change the terms of the Offer or the information concerning the Offer, or if we waive a material condition of the Offer, we will extend the Offer to the extent required by Exchange Act Rules 13e-4(d)(2), 13e-4(e)(3) and 13e-4(f)(1). These rules and related releases and interpretations of the SEC provide that the minimum period during which an Offer must remain open following material changes in the terms of the Offer or information concerning the Offer (other than a change in price or a change in percentage of securities sought) will depend on the facts and circumstances, including the relative materiality of the terms or information. If:

then in each case the Offer will be extended until the expiration of the period of at least ten business days after such announcement.

If we increase the aggregate purchase price payable for Shares purchased in the Offer such that the additional amount of Shares accepted for payment in the Offer does not exceed 2% of the outstanding Shares, this will not be deemed a material change to the terms of the Offer and we will not be required to amend or extend the Offer. See Section 1.

For purposes of the Offer, a "business day" means any day other than a Saturday, Sunday, or United States Federal holiday, and consists of the time period from 12:01 a.m. through 12:00 Midnight, New York City time.

We have retained B. Riley & Co., LLC to act as the Dealer Manager in connection with the Offer. The Dealer Manager may communicate with brokers, dealers, commercial banks and trust companies with respect to the Offer. The Dealer Manager will receive a reasonable and customary fee for these services. We also have agreed to reimburse the Dealer Manager for reasonable out-of-pocket expenses incurred in connection with the Offer, including reasonable fees and expenses of counsel, and to indemnify the Dealer Manager against liabilities in connection with the Offer.

We have retained MacKenzie Partners, Inc. to act as Information Agent and American Stock Transfer & Trust Company, LLC to act as Depositary in connection with the Offer. The Information Agent may contact holders of Shares by mail, telephone, facsimile and personal interviews and may

request brokers, dealers, commercial banks, trust companies and other nominee shareholders to forward materials relating to the Offer to beneficial owners. The Information Agent and the Depositary will each receive reasonable and customary compensation for their respective services, will be reimbursed by us for reasonable out-of-pocket expenses and will be indemnified against certain liabilities in connection with the Offer.

Certain officers and employees of the Company may render services in connection with the Offer but will not receive any additional compensation for such services.

We will not pay any fees or commissions to brokers, dealers, commercial banks, trust companies or other nominees (other than fees to the Dealer Manager and the Information Agent as described above) for soliciting tenders of Shares pursuant to the Offer. Shareholders holding Shares through brokers, dealers, commercial banks, trust companies or other nominees are urged to consult their brokers, dealers, commercial banks, trust companies or other nominees to determine whether transaction costs may apply if shareholders tender Shares through the brokers, dealers, commercial banks, trust companies or other nominees and not directly to the Depositary. We will, however, upon request, reimburse brokers, dealers, commercial banks, trust companies or other nominees for customary mailing and handling expenses incurred by them in forwarding this Offer to Purchase, the Letter of Transmittal and related materials to the beneficial owners of Shares held by them as a nominee or in a fiduciary capacity. No broker, dealer, commercial bank, trust company or other nominee has been authorized to act as our agent or the agent of the Dealer Manager, the Information Agent or the Depositary for purposes of the Offer. We will pay or cause to be paid all stock transfer taxes, if any, on our purchase of Shares except as otherwise provided in Instruction 7 of the Letter of Transmittal.

We are not aware of any jurisdiction where the making of the Offer is not in compliance with applicable law. If we become aware of any jurisdiction within the United States where the making of the Offer or the acceptance of Shares pursuant to the Offer is not in compliance with any applicable law, we will make a good faith effort to comply with the applicable law. If, after a good faith effort, we cannot comply with the applicable law, the Offer will not be made to, nor will tenders be accepted from or on behalf of, the holders of Shares residing in that jurisdiction. In any jurisdiction where the securities, "blue sky" or other laws require the Offer to be made by a licensed broker or dealer, the Offer will be deemed to be made on our behalf by the Dealer Manager or one or more registered brokers or dealers licensed under the laws of the jurisdiction.

Pursuant to Exchange Act Rule 13e-4, we have filed with the SEC the Schedule TO, which contains additional information relating to the Offer. The Schedule TO, including the exhibits and any amendments thereto, may be examined, and copies may be obtained, at the same places and in the same manner set forth in Section 10 with respect to information concerning the Company.

You should rely only on the information contained in this Offer to Purchase and the Letter of Transmittal or to which we have referred you in this Offer to Purchase. We have not authorized anyone to provide you with information or to make any representation on our behalf in connection with the Offer other than those contained in this Offer to Purchase and the Letter of Transmittal. If given or made, you should not rely on that information or representation as having been authorized by us, any member of the Board of Directors, the Dealer Manager, the Depositary or the Information Agent.

We have not authorized any person to make any recommendation on our behalf as to whether you should tender or not tender your Shares in the Offer. We have not authorized any person to give any information or to make any representation in connection with the Offer other than those contained in this Offer to Purchase or in the Letter of Transmittal. Any recommendation or any such information or representation made by anyone else must not be relied upon as having been authorized by EMCORE, the Dealer Manager, the Depositary or the Information Agent.

The Letter of Transmittal and certificates for Shares, and any other required documents, should be sent or delivered by each shareholder or the shareholder's broker, dealer, commercial bank, trust company or nominee to the Depositary at one of its addresses set forth below. To confirm delivery of Shares, shareholders are directed to contact the Depositary. Shareholders submitting certificates representing Shares to be tendered must deliver such certificates together with the Letter of Transmittal and any other required documents to the Depositary by mail or overnight courier. Facsimile copies of Share certificates will not be accepted.

Any questions or requests for assistance may be directed to the Information Agent or the Dealer Manager at their respective telephone numbers and addresses set forth below. Requests for additional copies of this Offer to Purchase, the Letter of Transmittal or the Notice of Guaranteed Delivery or related documents may be directed to the Information Agent at its telephone numbers or address set forth below. You may also contact your broker, dealer, commercial bank, trust company or other nominee for assistance concerning the Offer.

105 Madison Avenue
New York, New York 10016
(212) 929-5500 (Call Collect)
or
Call Toll-Free (800) 322-2885



*If delivering by mail:*		If delivering by hand, express mail, courier, or other expedited service:
American Stock Transfer & Trust Company, LLC Operations Center Attn. Reorganization Department P.O. Box 2042 New York, New York 10272-2042		American Stock Transfer & Trust Company, LLC Operations Center Attn. Reorganization Department 6201 15^th Avenue Brooklyn, New York 11219
Phone: Toll-free (877) 248-6417 (718) 921-8317 Fax 718 234-5001



SUMMARY TERM SHEET		1
FORWARD-LOOKING STATEMENTS		9
THE OFFER		12
1.	Number of Shares; Proration.	12
2.	Purpose of the Offer; Certain Effects of the Offer.	15
3.	Procedures for Tendering Shares.	17
4.	Withdrawal Rights.	22
5.	Purchase of Shares and Payment of Purchase Price.	23
6.	Conditional Tender of Shares.	24
7.	Conditions of the Offer.	25
8.	Price Range of Shares; Dividends.	28
9.	Source and Amount of Funds.	28
10.	Certain Information Concerning the Company.	28
11.	Interests of Directors and Executive Officers; Transactions and Arrangements Concerning the Shares.	30
12.	Effects of the Offer on the Market for Shares; Registration Under the Exchange Act	34
13.	Certain Legal Matters; Regulatory Approvals.	35
14.	Certain United States Federal Income Tax Consequences.	35
15.	Extension of the Offer; Termination; Amendment.	39
16.	Fees and Expenses.	40
17.	Miscellaneous.	41