Supplement to the

Fidelity^® Mega Cap Stock Fund

Class A, Class M, Class C, Class I, and Class Z

August 29, 2023

Prospectus

The following information replaces similar information found in the “Appendix” section under the “Sales Charge Waiver Policies Applied by Certain Intermediaries” heading.

Merrill Lynch

Purchases or sales of front-end (i.e. Class A) or level-load (i.e., Class C) mutual fund shares through a Merrill platform or account will be eligible only for the following sales load waivers (front-end, contingent deferred, or back-end waivers) and discounts, which differ from those disclosed elsewhere in a fund’s prospectus. Purchasers will have to buy mutual fund shares directly from the mutual fund company or through another intermediary to be eligible for waivers or discounts not listed below.

It is the client’s responsibility to notify Merrill at the time of purchase or sale of any relationship or other facts that qualify the transaction for a waiver or discount. A Merrill representative may ask for reasonable documentation of such facts and Merrill may condition the granting of a waiver or discount on the timely receipt of such documentation.

Additional information on waivers and discounts is available in the Merrill Sales Load Waiver and Discounts Supplement (the “Merrill SLWD Supplement”) and in the Mutual Fund Investing at Merrill pamphlet at ml.com/funds. Clients are encouraged to review these documents and speak with their financial advisor to determine whether a transaction is eligible for a waiver or discount.

Front-end Load Waivers Available at Merrill

• Shares of mutual funds available for purchase by employer-sponsored retirement, deferred compensation, and employee benefit plans (including health savings accounts) and trusts used to fund those plans provided the shares are not held in a commission-based brokerage account and shares are held for the benefit of the plan. For purposes of this provision, employer-sponsored retirement plans do not include SEP IRAs, Simple IRAs, SAR-SEPs or Keogh plans

• Shares purchased through a Merrill investment advisory program

• Brokerage class shares exchanged from advisory class shares due to the holdings moving from a Merrill investment advisory program to a Merrill brokerage account

• Shares purchased through the Merrill Edge Self-Directed platform

• Shares purchased through the systematic reinvestment of capital gains distributions and dividend reinvestment when purchasing shares of the same mutual fund in the same account

• Shares exchanged from level-load shares to front-end load shares of the same mutual fund in accordance with the description in the Merrill SLWD Supplement

• Shares purchased by eligible employees of Merrill or its affiliates and their family members who purchase shares in accounts within the employee’s Merrill Household (as defined in the Merrill SLWD Supplement)

• Shares purchased by eligible persons associated with the fund as defined in this prospectus (e.g. the fund’s officers or trustees)

• Shares purchased from the proceeds of a mutual fund redemption in front-end load shares provided (1) the repurchase is in a mutual fund within the same fund family; (2) the repurchase occurs within 90 calendar days from the redemption trade date, and (3) the redemption and purchase occur in the same account (known as Rights of Reinstatement). Automated transactions (i.e. systematic purchases and withdrawals) and purchases made after shares are automatically sold to pay Merrill’s account maintenance fees are not eligible for Rights of Reinstatement

CDSC Waivers on Front-end, Back-end, and Level Load Shares Available at Merrill

• Shares sold due to the client’s death or disability (as defined by Internal Revenue Code Section 22e(3))

• Shares sold pursuant to a systematic withdrawal program subject to Merrill’s maximum systematic withdrawal limits as described in the Merrill SLWD Supplement

• Shares sold due to return of excess contributions from an IRA account

• Shares sold as part of a required minimum distribution for IRA and retirement accounts due to the investor reaching the qualified age based on applicable IRS regulation

• Front-end or level-load shares held in commission-based, non-taxable retirement brokerage accounts (e.g. traditional, Roth, rollover, SEP IRAs, Simple IRAs, SAR-SEPs or Keogh plans) that are transferred to fee-based accounts or platforms and exchanged for a lower cost share class of the same mutual fund

Front-end Load Discounts Available at Merrill: Breakpoints, Rights of Accumulation & Letters of Intent

• Breakpoint discounts, as described in this prospectus, where the sales load is at or below the maximum sales load that Merrill permits to be assessed to a front-end load purchase, as described in the Merrill SLWD Supplement

• Rights of Accumulation (ROA), as described in the Merrill SLWD Supplement, which entitle clients to breakpoint discounts based on the aggregated holdings of mutual fund family assets held in accounts in their Merrill Household

• Letters of Intent (LOI), which allow for breakpoint discounts on eligible new purchases based on anticipated future eligible purchases within a fund family at Merrill, in accounts within your Merrill Household, as further described in the Merrill SLWD Supplement

Effective March 1, 2024, the fund’s management contract was amended to incorporate administrative services previously covered under separate services agreements. The amended contract incorporates a management fee rate that may vary by class. The Adviser or an affiliate pays certain expenses of managing and operating the fund out of each class’s management fee.

The following information replaces similar information found in the “Fund Summary” section under the “Fee Table” heading.

Annual Operating Expenses

(expenses that you pay each year as a % of the value of your investment)

	Class A	Class M	Class C	Class I	Class Z
Management fee	0.60%A,B	0.60%A,B	0.62%A,B	0.58%A,B	0.46%A,B
Distribution and/or Service (12b-1) fees	0.25%	0.50%	1.00%	None	None
Other expenses	0.02%B	0.02%B	0.02%B	0.02%B	0.02%B
Total annual operating expenses	0.87%	1.12%	1.64%	0.60%	0.48%

^A The management fee covers administrative services previously provided under separate services agreements with the fund, for which 0.20% for Class A, 0.21% for Class M, 0.23% for Class C, 0.18% for Class I, and 0.07% for Class Z was previously charged under the services agreements.

^B Adjusted to reflect current fees.

	Class A		Class M		Class C		Class I		Class Z
	Sell All Shares	Hold Shares	Sell All Shares	Hold Shares	Sell All Shares	Hold Shares	Sell All Shares	Hold Shares	Sell All Shares	Hold Shares
1 year	$ 659	$ 659	$ 460	$ 460	$ 267	$ 167	$ 61	$ 61	$ 49	$ 49
3 years	$ 837	$ 837	$ 694	$ 694	$ 517	$ 517	$ 192	$ 192	$ 154	$ 154
5 years	$ 1,029	$ 1,029	$ 945	$ 945	$ 892	$ 892	$ 335	$ 335	$ 269	$ 269
10 years	$ 1,586	$ 1,586	$ 1,665	$ 1,665	$ 1,738	$ 1,738	$ 750	$ 750	$ 604	$ 604

The following information replaces similar information found in the “Fund Management” section under the “Advisory Fee(s)” heading.

Each class of the fund pays a management fee to the Adviser.

The management fee is calculated and paid to the Adviser every month.

When determining a class’s management fee, a mandate rate is calculated based on the monthly average net assets of a group of funds advised by FMR within a designated asset class. A discount rate is subtracted from the mandate rate once the fund’s monthly average net assets reach a certain level. The mandate rate and discount rate may vary by class.

The annual management fee rate for each class of shares of the fund offered through this prospectus is the lesser of (1) the class’s mandate rate reduced by the class’s discount rate (if applicable) or (2) 0.60% for Class A, 0.60% for Class M, 0.62% for Class C, 0.58% for Class I, and 0.46% for Class Z. One-twelfth of the management fee rate for a class is applied to the average net assets of the class for the month, giving a dollar amount which is the management fee for the class for that month.

A different management fee rate may be applicable to each class of the fund. The difference between classes is the result of separate arrangements for class-level services and/or waivers of certain expenses. It is not the result of any difference in advisory or custodial fees or other expenses related to the management of the fund’s assets, which do not vary by class.

AGII-PSTK-0424-124 1.885801.124 April 1, 2024