Nelson Obus - 02 Feb 2023 Form 4 Insider Report for Williams Industrial Services Group Inc.

Footnote F1

As of the date of this Form 4, Mr. Obus is (i) a principal executive officer of Wynnefield Capital, Inc., which is the sole investment manager of Wynnefield Small Cap Value Offshore Fund, Ltd., which beneficially owns 1,576,936 shares of the issuer's common stock; (ii) a co-managing member of Wynnefield Capital Management, LLC, which is the sole general partner of Wynnefield Partners Small Cap Value, L.P. I, which beneficially owns 2,509,488 shares of the issuer's common stock, and the sole general partner of Wynnefield Partners Small Cap Value, L.P., which beneficially owns 2,119,632 shares of the issuer's common stock; and (iii) a co-trustee of Wynnefield Capital, Inc. Profit Sharing & Money Purchase Plan, which beneficially owns 255,276 shares of the issuer's common stock. Mr. Obus disclaims beneficial ownership of the securities described in this footnote except to the extent of his pecuniary interest.

Footnote F2

Consists of restricted shares granted under the 2015 Equity Incentive Plan, as amended and restated, all of which will vest on February 2, 2024. The vesting of the grant disclosed herein is subject to continued service as a director through the vesting and accelerated vesting upon occurrence of certain events. Any shares that do not vest will be forfeited.