0001562180-21-003582 4 1 20210514 20210518 20210518 Siwek William E 0001645109 4 34 001-37839 21937960 C/O TPI COMPISITES, INC. 8501 N. SCOTTSDALE RD, SUITE 280 SCOTTSDALE AZ 85253 TPI COMPOSITES, INC 0001455684 3510 201590775 8501 N SCOTTSDALE ROAD GAINEY CENTER II, SUITE 100 SCOTTSDALE AZ 85253 480-305-8910 8501 N SCOTTSDALE ROAD GAINEY CENTER II, SUITE 100 SCOTTSDALE AZ 85253 TPI COMPOSITES INC 20090206 4 1 primarydocument.xml PRIMARY DOCUMENT X0306 4 2021-05-14 false 0001455684 TPI COMPOSITES, INC TPIC 0001645109 Siwek William E 8501 NORTH SCOTTSDALE ROAD, GAINEY CENTER II, SUITE 100 SCOTTSDALE AZ 85253 false true false false President and CEO Common Stock 2021-05-14 4 M false 4544.00 0.00 A 107476.00 D Common Stock 2021-05-18 4 S false 2130.00 44.4147 D 105346.00 D Restricted Stock Units 2021-05-14 4 M false 4544.00 0.00 D Common Stock 4544.00 4543.00 D Represents the shares sold in a non-discretionary transaction to cover tax withholding obligations in connection with the vesting of 4,544 restricted stock units ("RSUs"). This transaction was executed in multiple trades at prices ranging from $44.36 to $44.51. The price reported above reflects the weighted-average price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer or a security holder of the Issuer full information regarding the number of shares and prices at which the transaction was effected. The RSUs award will vest in three equal installments on the first, second and third anniversary of the date of the grant provided, that the Reporting Person continues to provide services to the Issuer through the vesting date. The RSUs do not have an expiration date. Each RSU represents a contingent right to receive one share of the common stock. All unvested RSUs will automatically expire upon Reporting Person's termination of service from Issuer. /s/ Steven G. Fishbach, Attorney-in-Fact 2021-05-18