X0306 4 2017-07-19 0 0001370416 WESTPORT FUEL SYSTEMS INC. WPRT 0001132859 DOUGLAS KEVIN 125 E. SIR FRANCIS DRAKE BLVD., STE 400 LARKSPUR CA 94939 0 0 1 1 13(d)(3) group 0001268474 DOUGLAS FAMILY TRUST 125 E. SIR FRANCIS DRAKE BLVD., STE 400 LARKSPUR CA 94939 0 0 1 1 13(d)(3) group 0001268475 JAMES & JEAN DOUGLAS IRREVOCABLE DESCENDANTS TRUST 125 E. SIR FRANCIS DRAKE BLVD., STE 400 LARKSPUR CA 94939 0 0 1 1 13(d)(3) group 0001268476 DOUGLAS JAMES E III 125 E. SIR FRANCIS DRAKE BLVD., STE 400 LARKSPUR CA 94939 0 0 1 1 13(d)(3) group Common Stock 2017-07-19 4 A 0 600000 1.50 A 6829808 D Common Stock 2017-07-19 4 A 0 600000 1.50 A 6360206 I By James Douglas and Jean Douglas Irrevocable Descendants' Trust Common Stock 2953602 I By Douglas Family Trust Common Stock 2017-07-19 4 A 0 200000 1.50 A 1915790 I By James E. Douglas III Common Stock 52902 I By KGD 2012 Trust Common Stock 52902 I By MMD 2012 Trust Common Stock 2017-07-19 4 A 0 150000 1.50 A 150000 I By Alex Douglas 2K3 Trust Common Stock 2017-07-19 4 A 0 150000 1.50 A 150000 I By Jake Douglas 2K3 Trust Common Stock 2017-07-19 4 A 0 150000 1.50 A 150000 I By Amanda Douglas 2K3 Trust These shares are held directly and jointly by Kevin Douglas and his wife, Michelle Douglas. Each 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. These shares are held directly by the James Douglas and Jean Douglas Irrevocable Descendants' Trust and indirectly by Kevin Douglas. Kevin Douglas and Michelle Douglas, husband and wife, are each a co-trustee of the James Douglas and Jean Douglas Irrevocable Descendants' Trust. These 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. These shares are held directly by James E. Douglas III and indirectly by Kevin Douglas. These shares are held by the KGD 2012 Trust, of which Kevin Douglas is the settlor and has the right to substitute property of equivalent value in return for the shares held by the KGD 2012 Trust, and indirectly by Kevin Douglas. These shares are held by the MMD 2012 Trust, of which Michelle Douglas is the settlor and has the right to substitute property of equivalent value in return for the shares held by the MMD 2012 Trust, and indirectly by Michelle Douglas and Kevin Douglas. These shares are held by the Alex Douglas 2K3 Trust and indirectly by Michelle Douglas and Kevin Douglas. These shares are held by the Jake Douglas 2K3 Trust and indirectly by Michelle Douglas and Kevin Douglas. These shares are held by the Amanda Douglas 2K3 Trust and indirectly by Michelle Douglas and Kevin Douglas. /s/ Eileen Wheatman, attorney in fact for Kevin Douglas 2017-07-21 /s/ Eileen Wheatman, attorney in fact for Douglas Family Trust 2017-07-21 /s/ Eileen Wheatman, attorney in fact for James Douglas and Jean Douglas Irrevocable Descendants' Trust 2017-07-21 /s/ Eileen Wheatman, attorney in fact for James E. Douglas III 2017-07-21