HBIO
insider transactionsHARVARD BIOSCIENCE INC — buys & sells by directors, officers and 10% owners A shareholder owning more than 10% of the company. Must report trades, but usually a weaker signal than an officer or director. (SEC Form 4).
Cluster buy signal: Multiple insiders at the same company buying around the same time — often a stronger signal than a single buy. 4 different insiders made open-market purchases in the last 365 days, totalling $202.4K.
Net shares · 365d
+33.2K
41.0K buy · 7.8K sell
Net value · 365d
$161.7K
$202.4K in · $40.7K out
Sentiment · 365d
Net buying
83% buying · 17% selling
Open-market trades · 365d
6
41.0K buy · 7.8K sell
Net buy / sell volume
Not enough data to chart yet.
Tap or hover the chart for daily net volume. Green = net buying, red = net selling.
All transactions
-
Grant·A
Director
$0
16.6K sh
Own +52%
-
Grant·A
Director
$0
16.6K sh
Own +151%
-
Grant·A
Director
$0
16.6K sh
Own +79%
-
Grant·A
Director
$0
16.6K sh
Own +151%
-
Grant·A
Director
$0
16.6K sh
Own +39%
-
Sell·S
Robert E. Gagnon KEY
Chief Financial Officer
$40.7K
7.8K sh · $5.18
Own -1%
-
Grant·A
Mark T Frost KEY
Chief Financial Officer
$0
30.0K sh
Own +171%
-
Grant·A
John D Duke KEY
Chief Executive Officer
$0
75.0K sh
Own +71%
-
Buy·P
Director
$41.1K
8.5K sh · $4.85
Own +36%
-
Buy·P
Director
$48.7K
10.0K sh · $4.87
Own +91%
-
Buy·P
Mark T Frost KEY
Chief Financial Officer
$25.0K
5.0K sh · $5.00
Own +40%
-
Buy·P
John D Duke KEY
Chief Executive Officer
$25.1K
5.0K sh · $5.01
Own +5%
-
Buy·P
Director
$62.5K
12.5K sh · $4.99
Own +114%
-
Grant·A
Robert E. Gagnon KEY
Chief Financial Officer
$0
400.0K sh
Own +200%
| Date▾ | Insider | Type | Shares | Value |
|---|---|---|---|---|
| Jun 9, 2026 | William Snider | Grant A | 16.6K | $0 |
| Jun 9, 2026 | Robert E. Gagnon | Grant A | 16.6K | $0 |
| Jun 9, 2026 | Stephen J Denelsky | Grant A | 16.6K | $0 |
| Jun 9, 2026 | Seth Benjamin Benson | Grant A | 16.6K | $0 |
| Jun 9, 2026 | Katherine A. Eade | Grant A | 16.6K | $0 |
| Apr 23, 2026 | Robert E. Gagnon KEY | Sell S | 7.8K | $40.7K |
| Mar 20, 2026 | Mark T Frost KEY | Grant A | 30.0K | $0 |
| Mar 20, 2026 | John D Duke KEY | Grant A | 75.0K | $0 |
| Mar 17, 2026 | William Snider | Buy P | 8.5K | $41.1K |
| Mar 17, 2026 | Stephen J Denelsky | Buy P | 10.0K | $48.7K |
| Mar 16, 2026 | Mark T Frost KEY | Buy P | 5.0K | $25.0K |
| Mar 16, 2026 | John D Duke KEY | Buy P | 5.0K | $25.1K |
| Mar 16, 2026 | William Snider | Buy P | 12.5K | $62.5K |
| Jan 22, 2026 | Robert E. Gagnon KEY | Grant A | 400.0K | $0 |
About HBIO insider trading
This page tracks insider transactions for HARVARD BIOSCIENCE INC (HBIO) reported to the U.S. Securities and Exchange Commission on Form 4. Corporate insiders — directors, executive officers and beneficial owners of more than 10% of the stock — must disclose their trades within two business days. Open-market purchases (code P) and sales (code S) made at the insider's discretion are the most-watched opportunistic signals, while awards (A), option exercises (M) and tax-withholding (F) reflect compensation rather than conviction. Trades marked 10b5-1 were made under a pre-arranged plan and are considered routine. A cluster buy — several insiders buying within a short window — is historically a stronger bullish indicator than any single trade.