8-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of

The Securities Exchange Act of 1934

Date of Report (Date of earliest event reported)

June 12, 2006

PHARSIGHT CORPORATION

(Exact name of registrant as specified in its charter)

Delaware	000-31253	77-0401273
(State or other jurisdiction of incorporation)	(Commission File Number)	(IRS Employer Identification No.)

321 E. Evelyn Avenue, 3^rd Floor

Mountain View, CA 94041-1530

(Address of principal executive offices, including zip code)

(650) 314-3800

(Registrant’s telephone number, including area code)

(Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

¨ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

¨ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

¨ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

¨ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Item 1.01 Entry into a Material Definitive Agreement.

On June 12, 2006, Pharsight Corporation (the “Company”) and Silicon Valley Bank (the “Bank”) entered into the Fifth Amendment to the Loan and Security Agreement (the “Loan Amendment”), filed herewith as Exhibit 99.1 and incorporated herein by reference, to the Amended and Restated Loan and Security Agreement effective as of May 24, 2004 by and between Silicon Valley Bank and Pharsight Corporation, as amended (the “Loan and Security Agreement”). The Loan Modification amends in part Section 2.4 of the Loan and Security Agreement to provide that interest due on the Committed Revolving Line is payable on the 25^th day of each month and amends Section 13.1 of the Loan and Security Agreement by changing the “Revolving Maturity Date” to May 26, 2007. In addition, the Loan Amendment amends in part Section 6.7 by replacing the profitability/loss financial covenant with a covenant requiring the Company to maintain a minimum tangible net worth in the amount not less than $3,000,000. Furthermore, the Loan Amendment also provides for additional representations and warranties by the Company to induce the Bank to enter into the Loan Amendment.

Item 9.01 Financial Statements and Exhibits.

(c) Exhibits.

Exhibit No.	Description
99.1	Fifth Amendment to Loan and Security Agreement effective as of June 12, 2006 between Pharsight Corporation and Silicon Valley Bank.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this Report to be signed on its behalf by the undersigned hereunto duly authorized.

PHARSIGHT CORPORATION
By:	/s/ William Frederick
Name:	William Frederick
Title:	Senior Vice President and Chief Financial Officer

Date: June 15, 2006

EX-99.1

Exhibit 99.1

FIFTH AMENDMENT

TO

LOAN AND SECURITY AGREEMENT

THIS FIFTH AMENDMENT to Loan and Security Agreement (this “Amendment”) is entered into this 12th day of June, 2006, by and between Silicon Valley Bank (“Bank”) and Pharsight Corporation, a Delaware corporation (“Borrower”) whose address is 321 East Evelyn Avenue, 3rd Floor, Mountain View, CA 94041.

RECITALS

A. Bank and Borrower have entered into that certain Amended and Restated Loan and Security Agreement dated as of May 27, 2004, as amended by that certain Loan Modification Agreement by and between Bank and Borrower dated as of February 10, 2005, as amended by that certain Loan Modification by and between Bank and Borrower dated as of May 26, 2005, as amended by that certain Loan Modification Agreement by and between Bank and Borrower dated as of June 20, 2005, and as further amended by that certain Fourth Amendment to Loan and Security Agreement by and between Bank and Borrower dated as of July 14, 2005 (as the same may from time to time be further amended, modified, supplemented or restated, the “Loan Agreement”).

B. Bank has extended credit to Borrower for the purposes permitted in the Loan Agreement.

C. Borrower has requested that Bank amend the Loan Agreement to (i) extend the Revolving Maturity Date, and (ii) make certain other revisions to the Loan Agreement as more fully set forth herein.

D. Bank has agreed to so amend certain provisions of the Loan Agreement, but only to the extent, in accordance with the terms, subject to the conditions and in reliance upon the representations and warranties set forth below.

AGREEMENT

NOW, THEREFORE, in consideration of the foregoing recitals and other good and valuable consideration, the receipt and adequacy of which is hereby acknowledged, and intending to be legally bound, the parties hereto agree as follows:

1. Definitions. Capitalized terms used but not defined in this Amendment shall have the meanings given to them in the Loan Agreement.

2. Amendments to Loan Agreement.

2.1 Section 2.4 (Interest Rate, Payments). The first sentence of Section 2.4(a) is amended in its entirety and replaced with the following:

(a) Payments Interest due on the Committed Revolving Line is payable on the 25^th of each month.

2.2 Section 6.7 (Financial Covenants). Sub section (ii) of Section 6.7 is hereby deleted and replaced with the following:

(ii) Tangible Net Worth (tested quarterly). Beginning with quarter ending June 30, 2006, Borrower shall maintain a minimum Tangible Net Worth in the amount not less than $3,000,000.

2.3 Section 13 (Definitions). The following term and its respective definition set forth in Section 13.1 is amended in its entirety and replaced with the following:

“Revolving Maturity Date” is the earliest of (a) May 25, 2007, (b) the occurrence of an Event of Default, or (c) or if there exists any event, condition, or act which with notice or lapse of time or both, could constitute an Event of Default.

3. Limitation of Amendments.

3.1 The amendments set forth in Section 2, above, are effective for the purposes set forth herein and shall be limited precisely as written and shall not be deemed to (a) be a consent to any amendment, waiver or modification of any other term or condition of any Loan Document, or (b) otherwise prejudice any right or remedy which Bank may now have or may have in the future under or in connection with any Loan Document.

3.2 This Amendment shall be construed in connection with and as part of the Loan Documents and all terms, conditions, representations, warranties, covenants and agreements set forth in the Loan Documents, except as herein amended, are hereby ratified and confirmed and shall remain in full force and effect.

4. Representations and Warranties. To induce Bank to enter into this Amendment, Borrower hereby represents and warrants to Bank as follows:

4.1 Immediately after giving effect to this Amendment (a) the representations and warranties contained in the Loan Documents are true, accurate and complete in all material respects as of the date hereof (except to the extent such representations and warranties relate to an earlier date, in which case they are true and correct as of such date), and (b) no Event of Default has occurred and is continuing;

4.2 Borrower has the power and authority to execute and deliver this Amendment and to perform its obligations under the Loan Agreement, as amended by this Amendment;

4.3 The organizational documents of Borrower delivered to Bank on May 27, 2004 remain true, accurate and complete and have not been amended, supplemented or restated and are and continue to be in full force and effect;

4.4 The execution and delivery by Borrower of this Amendment and the performance by Borrower of its obligations under the Loan Agreement, as amended by this Amendment, have been duly authorized;

4.5 The execution and delivery by Borrower of this Amendment and the performance by Borrower of its obligations under the Loan Agreement, as amended by this Amendment, do not and will not contravene (a) any law or regulation binding on or affecting Borrower, (b) any contractual restriction with a Person binding on Borrower, (c) any order, judgment or decree of any court or other governmental or public body or authority, or subdivision thereof, binding on Borrower, or (d) the organizational documents of Borrower;

4.6 The execution and delivery by Borrower of this Amendment and the performance by Borrower of its obligations under the Loan Agreement, as amended by this Amendment, do not require any order, consent, approval, license, authorization or validation of, or filing, recording or registration with, or exemption by any governmental or public body or authority, or subdivision thereof, binding on either Borrower, except as already has been obtained or made; and

4.7 This Amendment has been duly executed and delivered by Borrower and is the binding obligation of Borrower, enforceable against Borrower in accordance with its terms, except as such enforceability may be limited by bankruptcy, insolvency, reorganization, liquidation, moratorium or other similar laws of general application and equitable principles relating to or affecting creditors’ rights.

5. Integration. This Amendment and the Loan Documents represent the entire agreement about this subject matter and supersede prior negotiations or agreements. All prior agreements, understandings, representations, warranties, and negotiations between the parties about the subject matter of this Amendment and the Loan Documents merge into this Amendment and the Loan Documents.

6. Counterparts. This Amendment may be executed in any number of counterparts and all of such counterparts taken together shall be deemed to constitute one and the same instrument.

7. Effectiveness. This Amendment shall be deemed effective as of May 26, 2006 upon (a) the due execution and delivery to Bank of this Amendment by each party hereto, (b) Borrower’s payment of a renewal fee in an amount equal to $10,500.

[Signature page follows.]

IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be duly executed and delivered as of the date first written above.

BANK		BORROWER
Silicon Valley Bank		Pharsight Corporation
By:	/s/ Liam Fairbairn	By:	/s/ William Frederick
Name:	Liam Fairbairn	Name:	William Frederick
Title:	Relationship Manager	Title:	SVP & CFO