X0306 4 2018-05-16 false 0001455684 TPI COMPOSITES, INC TPIC 0001241831 DEUTCH PHILIP J 1750 K STREET NW, SUITE 700 WASHINGTON DC 20006 true false false false Common Stock 2018-05-16 4 S false 26620.00 26.39 D 1216390.00 I See Footnote Common Stock 2018-05-17 4 S false 36700.00 26.61 D 1179690.00 I See Footnote Common Stock 2018-05-18 4 S false 195480.00 26.08 D 984210.00 I See Footnote Common Stock 6620.00 D This transaction was executed in multiple trades at prices ranging from $26.27 to $26.61. 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. These securities are held of record by NGP Energy Technology Partners, L.P. ("NGP LP"). NGP ETP, L.L.C. ("NGP ETP") is the general partner of NGP LP and Energy Technology Partners, L.L.C. ("ETP LLC") is the manager of NGP ETP. The Reporting Person is the manager of ETP LLC and may be deemed to share voting and investment power with respect to all shares held by NGP LP. This report on Form 4 is jointly filed by NGP LP, NGP ETP and ETP LLC. Each of the Reporting Persons disclaims beneficial ownership of the securities reported herein for purposes of Rule 16a-1(a) under the Securities Exchange Act of 1934, as amended (the "Exchange Act"), except to the extent of its pecuniary interest therein, if any. This report shall not be deemed an admission that any of the Reporting Persons is a beneficial owner of such securities for the purpose of Section 16 of the Exchange Act, or for any other purpose. This transaction was executed in multiple trades at prices ranging from $26.20 to $27.03. 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. This transaction was executed in multiple trades at prices ranging from $26.00 to $26.99. 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. /s/ Steven G. Fishbach, Attorney-in-Fact 2018-05-18