Security	Date	Code	Shares	Price	A/D	D/I	Nature of ownership
Common Stock^F7,F1,F2	Jun 1, 2016	D	1,056,671	—	D	D
Common Stock^F7,F2,F3	Jun 1, 2016	D	901,758	—	D	I	By James Douglas and Jean Douglas Irrevocable Descendants' Trust
Common Stock^F7,F2,F4	Jun 1, 2016	D	449,088	—	D	I	By Douglas Family Trust
Common Stock^F7,F2,F5	Jun 1, 2016	D	264,167	—	D	I	By James E. Douglas III

Table II — derivative securities

No Table II lines on this filing.

Explanation of responses

F1These shares are held directly and jointly by Kevin Douglas and Michelle Douglas.
F2Each of the reporting persons hereunder (individually, a "Reporting Person" and collectively the "Reporting Persons") may be deemed a member of a "group" within the meaning of Section 13(d)(3) of the Securities and Exchange Act of 1934, as amended (the "Exchange Act") or Rule 13d-5 promulgated under the Exchange Act, with one or more of the other Reporting Persons. Although the Reporting Persons are reporting such securities as if they were members of a "group", the filing of this Form 4 shall not be deemed an admission by any Reporting Person that such Reporting Person is a beneficial owner of any securities other than those directly held by such Reporting Person.
F3These shares are held directly by the James Douglas and Jean Douglas Irrevocable Descendants' Trust and indirectly by Kevin Douglas and Michelle Douglas. Kevin Douglas and Michelle Douglas, husband and wife, are each a co-trustee of the James Douglas and Jean Douglas Irrevocable Descendants' Trust.
F4These shares are held directly by the Douglas Family Trust and indirectly by Kevin Douglas. James E. Douglas, Jr. and Jean A. Douglas, husband and wife, are each a co-trustee of the Douglas Family Trust.
F5These shares are held directly by James E. Douglas III and indirectly by Kevin Douglas.
F6On June 1, 2016, Westport Innovations Inc. ("Westport") acquired Fuel Systems Solutions, Inc. (the "Company") pursuant to the Agreement and Plan of Merger by and among Westport, Whitehorse Merger Sub Inc. ("Merger Sub") and the Company, dated as of September 1, 2015, as amended by Amendment No. 1 thereto, dated as of March 6, 2016 (the "Merger Agreement"). In accordance with the Merger Agreement, Merger Sub merged with and into the Company (the "Merger"), with the Company surviving the Merger as a wholly owned subsidiary of Westport.
F7At the effective time of the Merger, each outstanding share of the Company's common stock was converted into the right to receive 2.4755 common shares of Westport based on the exchange ratio provided for in the Merger Agreement.