X0306 4 2022-02-04 0 0001816613 Markforged Holding Corp MKFG 0001554599 Hartz Kevin C/O MARKFORGED HOLDING CORPORATION 480 PLEASANT STREET WATERTOWN MA 02472 1 0 0 0 Common Stock 2022-02-04 5 J 0 E 148770 0.00 A 148770 I See footnote Common Stock 2022-02-04 5 J 0 E 148770 0.00 A 148770 I See footnote Common Stock 2022-02-04 5 J 0 E 1790460 0.00 A 1790460 I See footnote Warrant to Purchase Common Stock (right to buy) 11.50 2021-08-13 2026-07-14 Common Stock 89775 89775 I See footnote Warrant to Purchase Common Stock (right to buy) 11.50 2021-08-13 2026-07-14 Common Stock 89775 89775 I See footnote Warrant to Purchase Common Stock (right to buy) 11.50 2021-08-13 2026-07-14 Common Stock 1080450 1080450 I See footnote The Class B Ordinary Shares of one, the Issuer's predecessor, automatically converted to Class A Ordinary Shares, which then automatically converted to shares of Common Stock of the Issuer upon the consummation of the merger between the Issuer and one, on July 14, 2021. Of the shares reported herein, 50% are subject to vesting conditions, and will be forfeited if not vested as of July 14, 2026. 25% will vest if the volume-weighted average price of Issuer's common stock is at least $12.50 for any 20 trading days within a 30-trading-day period, and 25% will vest if such price is at least $15.00 for any 20 trading days within a 30-trading-day-period. Such unvested shares are held directly by A-Star LLC ("A-Star"), of which the trusts described below are members. The Reporting Person disclaims beneficial ownership of the securities reported herein, except to the extent of his pecuniary interest therein. Consists of (i) shares and warrants held directly by The Kevin Earnest Hartz 2020 Annuity Trust U/A/D (of which the Reporting Person is trustee), reflecting a pro rata distribution of certain securities held by A-Star to its members prior to the date of this report (the "Distribution"), and (ii) shares held indirectly by such trust, reflecting the proportionate interest of such trust in the shares held by A-Star.. Consists of (i) shares and warrants held directly by The Julia D. Hartz 2020 Annuity Trust U/A/D (of which the spouse of the Reporting Person is trustee), reflecting the Distribution, and (ii) shares held indirectly by such trust, reflecting the proportionate interest of such trust in the shares held by A-Star. Consists of (i) shares and warrants held directly by the Hartz Family Revocable Trust (of which the Reporting Person is co-trustee), reflecting the Distribution, and (ii) shares held indirectly by such trust, reflecting the proportionate interest of such trust in the shares held by A-Star. The warrants are exercisable for shares of common stock of the Issuer. This Report on Form 4 is filed voluntarily to reflect certain changes in the form of the Reporting Person's indirect beneficial ownership in the securities of the Issuer. /s/ Stephen Karp, Attorney-in-Fact 2022-02-25