X0306 4 2019-05-23 0 0001123494 HARVARD BIOSCIENCE INC HBIO 0001197452 LOY BERTRAND C/O HARVARD BIOSCIENCE, INC. 84 OCTOBER HILL RD. HOLLISTON MA 01746 1 0 0 0 Common Stock 2019-05-23 4 A 0 35100 0.00 A 184950 D Represents a deferred stock award of 35,100 restricted stock units which fully vest on the earlier to occur of (i) the date of the Issuer's next Annual Meeting of Stockholders after May 16, 2019, immediately prior to the commencement of such meeting, and (ii) May 23, 2020. Includes (a) deferred stock award of 35,100 restricted stock units which fully vest on the earlier of (i) the date of the Issuer's next Annual Meeting of Stockholders after May 16, 2019, immediately prior to the commencement of such meeting, and (ii) May 23, 2020; (b) a deferred stock award of 10,500 restricted stock units which vest quarterly in equal installments on June 30, 2019, September 30, 2019 and December 31, 2019; and (c) 139,350 shares of common stock held by the Reporting Person. This form has been signed under power of attorney. /s/ Chad Porter, by power of attorney 2019-05-24