HARVARD BIOSCIENCE INC — Director's Dealing 2008

May 20, 2008

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: HARVARD BIOSCIENCE INC (HBIO)
CIK: 0001123494
Period of Report: 2008-05-16

Reporting Person: HSO LIMITED PARTNERSHIP (10% Owner)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2008-05-16	Common Stock	S	733300	$5.0	Disposed	2757257	Direct

Footnotes

F1: The Reporting Person's sale of HBIO common stock reported herein was matchable under Section 16(b) of the Securities Exchange
Act of 1934, as amended, to the extent of 10,660 shares, with the Reporting Person's purchases of 5.043 shares and 5,617
shares of HBIO common stock on November 19, 2007 and November 20, 2007, respectively (the "Purchases"). The investment
member of the general partner of the Reporting Person has agreed to pay to HBIO the full amount of the profit realized in
connection with the short-swing transactions, less transaction costs, and less amounts previously paid to HBIO on behalf of
the Reporting Person in connection with a previously disclosed transaction matchable against the Purchase on November 19,
2007.