0001562180-21-002316 4 1 20210315 20210317 20210317 Siwek William E 0001645109 4 34 001-37839 21752609 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 2021-03-15 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 2021-03-15 4 M false 11579.00 0.00 A 106412.00 D Common Stock 2021-03-15 4 S false 3480.00 52.30 D 102932.00 D Restricted Stock Units 2021-03-15 4 M false 11579.00 0.00 D Common Stock 11579.00 0.00 D Represents the shares sold in a non-discretionary transaction to cover tax withholding obligations in connection with the vesting of 11,579 restricted stock units ("RSUs"). This transaction was executed in multiple trades at prices ranging from $51.91 to $52.87. 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. 100% of the RSUs vested in full on the third anniversary of the grant date; provided that the Reporting Person continues to provide service 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 2021-03-17