UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13G

Under the Securities Exchange Act of 1934

(Amendment No. 1)*

EXA CORPORATION

(Name of Issuer)

COMMON STOCK

(Title of Class of Securities)

300614500

(CUSIP Number)

July 21, 2015

(Date of Event which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

¨ Rule 13d-1(b)

¨ Rule 13d-1(c)

x Rule 13d-1(d)

The information required on the remainder of this cover page shall not be deemed to be “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934 (“Act”) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

Page 6 of 9 Pages

Exa Corporation

55 Network Drive

Burlington, MA 01803

This Statement is being filed by and on behalf of each of Boston Capital Ventures IV Limited Partnership (“BCV IV”), Boston Capital Partners IV LLC (“BCP IV”), Johan von der Goltz (“Mr. von der Goltz”), and John J. Shields, III (“Mr. Shields” and, together with BCV IV, BCP IV, and Mr. von der Goltz, the “Reporting Persons”). Mr. von der Goltz and Mr. Shields are the managing members of BCP IV, which is the sole general partner of BCV IV. This amendment is being filed to report the fact that, as of the date of this report, the Reporting Persons have ceased to be the beneficial owner of more than five percent of the class of securities of the Issuer.

Each Reporting Person’s principal business address is 84 State Street, Suite 320, Boston, MA 02109

Common Stock

300614500

Not applicable

Page 7 of 9 Pages

If this statement is being filed to report the fact that as of the date hereof the reporting person has ceased to be the beneficial owner of more than five percent of the class of securities, check the following  x

Not applicable.

Item 7. Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on By the Parent Holding Company.

Not applicable.

Not applicable.

Not applicable.

Not applicable.

Page 8 of 9 Pages

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, the undersigned certifies that the information set forth in this statement is true, complete and correct.

Date: August 28, 2015

Page 9 of 9 Pages

Exhibit Index

Exhibit 24.1

POWER OF ATTORNEY

Know all by these presents, that the undersigned hereby constitutes and appoints Michael J. Anderson, the undersigned’s true and lawful attorney-in-fact to:

The undersigned hereby grants to each such attorney-in-fact full power and authority to do and perform any and every act and thing whatsoever requisite, necessary, or proper to be done in the exercise of any of the rights and powers herein granted, as fully to all intents and purposes as the undersigned might or could do if personally present, with full power of substitution or revocation, hereby ratifying and confirming all that such attorney-in-fact, or such attorney-in-fact’s substitute or substitutes, shall lawfully do or cause to be done by virtue of this power of attorney and the rights and powers herein granted. The undersigned acknowledges that the foregoing attorney-in-fact, in serving in such capacity at the request of the undersigned, is not assuming, nor are BCP IV or BCV IV assuming, any of the undersigned’s responsibilities to comply with Section 16 or Regulation 13D-G of the Securities Exchange Act of 1934.

This Power of Attorney shall remain in full force and effect until the undersigned is no longer required to file SEC Forms with respect to the undersigned’s ownership and/or management relationship with BCP IV and BCV IV, unless earlier revoked by the undersigned in a signed writing delivered to the foregoing attorney-in-fact.

IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be executed as of this 14th day of February 2013.

Exhibit 99.1

EXHIBIT 99.1 - JOINT FILING AGREEMENT

The undersigned hereby agree that they are filing this statement jointly pursuant to Rule 13d-1(k)(1). Each of them is responsible for the timely filing of such Schedule 13G and any amendments thereto, and for the completeness and accuracy of the information concerning such person contained therein; but none of them is responsible for the completeness or accuracy of the information concerning the other persons making the filing, unless such person knows or has reason to believe that such information is inaccurate.

In accordance with Rule 13d-1(k)(1) promulgated under the Securities and Exchange Act of 1934, as amended, the undersigned hereby agree to the joint filing with each other on behalf of each of them to such a statement on Schedule 13G with respect to the common stock of Exa Corporation beneficially owned by each of them. This Joint Filing Agreement shall be included as an exhibit to such Schedule 13G.

Date: August 27, 2015