John D. Duke - 20 Mar 2026 Form 4 Insider Report for HARVARD BIOSCIENCE INC (HBIO)

Reporting relationship: Chief Executive Officer, Director
Issuer ticker: HBIO
Reported as of: 20 Mar 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 23 Mar 2026, 09:48:04 UTC
Prior SEC filing: 17 Mar 2026
Source filing: View source filing
Reporting owner signature: /s/ John D Duke

Key filing fact

John D. Duke filed Form 4 for HARVARD BIOSCIENCE INC (HBIO) on 23 Mar 2026.

Key facts

This page summarizes John D. Duke's Form 4 filing for HARVARD BIOSCIENCE INC (HBIO).
1 reported transaction and 0 derivative rows are listed below.
Accepted by SEC: 23 Mar 2026, 09:48.

Change

Previous filing in this sequence was filed on 17 Mar 2026.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0002071593 Primary reporting owner

Duke John D

Relationship: Chief Executive Officer, Director
Address: C/O HARVARD BIOSCIENCE, INC., 84 OCTOBER HILL ROAD, HOLLISTON
Signature: /s/ John D Duke
Signature date: 23 Mar 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

HBIO transaction

Common Stock

Award

Transaction value
Shares: +75,000
Change %: +71%
Price: $0.000000^*
Shares after: 180,000
Date: 20 Mar 2026
Ownership: Direct
Footnotes: F1

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 1 footnote

Footnote F1

See remarks

SEC remarks

Includes (a) an award granting 75,000 restricted stock units (RSUs) that will vest in three equal installments on March 20, 2027, 2028, and 2029, subject to the terms set forth in an award agreement between the Issuer and the Reporting Person, (b) 5,000 shares of common stock purchased on March 16, 2026, (c) an award of 50,000 RSUs that will vest in three equal installments on August 8, 2026, 2027 and 2028, subject to the terms set forth in an award agreement between the Issuer and the Reporting Person and (d) an award of 50,000 RSUs with performance based vesting conditions. These RSUs will vest upon the achievement of a relative total shareholder return of the Issuer's common stock during the period from August 8, 2025 to the earlier of (i) July 30, 2028, and (ii) the date of a change of control, measured relative to the Russell2000 index, subject to the terms set forth in an award agreement between the Issuer and the Reporting Person. The target number of these RSUs that may be earned is reported above; the maximum amount is 150% of the number reported.