X0306 4 2021-04-30 0 0001828161 FTC Solar, Inc. FTCI 0001857126 ARC Family Trust 20 MONTCHANIN ROAD, SUITE 100 GREENVILLE DE 19807 0 0 1 0 Common Stock 2021-04-30 4 J 0 563150 12.155 D 21941357 D On April 30, 2021 the Issuer used a portion of the net proceeds from the closing of its initial public offering ("IPO") of Common Stock to purchase Common Stock from certain of the Issuer's pre-IPO equityholders, including the Reporting Person. The ARC Family Trust was established by Ahmad Chatila, a member of the Issuer's board of directors, for the benefit of certain members of his family. Shaker Sadasivam, a member of the Issuer's board of directors, is the trustee of the ARC Family Trust and has sole voting and dispositive power with respect to these securities. Mr. Sadasivam disclaims beneficial ownership of these securities, except to the extent of his pecuniary interest therein, if any, and this report shall not be deemed an admission that he is the beneficial owner of such securities for Section 16 or any other purpose. /s/ Jacob D. Wolf, as Attorney-in-Fact 2021-05-04