0000899243-17-018895 4 1 20170722 20170725 20170725 Siwek William E 0001645109 4 34 001-37839 17980910 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 doc4.xml FORM 4 SUBMISSION X0306 4 2017-07-22 0 0001455684 TPI COMPOSITES, INC TPIC 0001645109 Siwek William E 8501 NORTH SCOTTSDALE ROAD, GAINEY CENTER II, SUITE 100 SCOTTSDALE AZ 85253 0 1 0 0 CFO Common Stock 2017-07-22 4 M 0 26400 0.00 A 35491 D Common Stock 2017-07-24 4 F 0 7934 18.37 D 27557 D Restricted Stock Units 2017-07-22 4 M 0 26400 0.00 D Common Stock 26400 52800 D Represents the shares required to satisfy tax withholding obligations in connection with the vesting of 26,400 restricted stock units. One-third of the restricted stock units vest on each of the first, second and third anniversaries of the effective date of the initial public offering of the Issuer; provided, that the Reporting Person continues to provide service to the Issuer through each applicable vesting date. The restricted stock units do not have an expiration date. Each restricted stock unit represents a contingent right to receive one share of the common stock. All unvested restricted stock units will automatically expire upon Reporting Person's termination of service from Issuer. /s/ Steven G. Fishbach, Attorney-in-Fact 2017-07-25