Nasdaq · CIK 0001123494
HBIO HARVARD BIOSCIENCE INC
Insider trading from SEC Form 4. Last filing Jun 12, 2026. Close $8.24 on Oct 9, 2026, +117% from the 52-week low and -4% from the high.
HARVARD BIOSCIENCE INC (HBIO) has 24 SEC Form 4 filings on file from 9 insiders, the latest filed on Jun 12, 2026. No insider bought or sold on the open market in the last 90 days; rows filed in that time are grants, exercises, tax withholding and other transactions that carry no view on the price.
4 open-market trades have been scored at HBIO. The newest: Mark T Frost (Chief Financial Officer) bought $25k of stock on Mar 16, 2026, filed Apr 1, 2026, scored 56 (moderate). The largest of the 4 shown: William Snider (director) bought $104k on Mar 16, 2026, scored 58 (moderate). 4 insiders bought within 14 days of each other around Mar 16, 2026.
HBIO closed at $8.24 on Oct 9, 2026, 117% above its 52-week low and 4% below its 52-week high.
Last 90 days
Price and insider trades, last year
Daily candles, adjusted for splits and dividends. Green arrows are insider buys, red are sells, sized by value. Click a marked bar to open the signal.Charts by TradingView Lightweight Charts™
Signals
Open-market buys and sells at HARVARD BIOSCIENCE INC, scored.
| Score | Insider | Value | Holdings | Price context | Filed |
|---|---|---|---|---|---|
| 56Moderate | Mark T Frost Chief Financial Officer buy | $25k 5,000 shares | +40% | +79% from low-37% from high | |
| 55Moderate | Stephen J Denelsky director buy | $49k 10,000 shares | +91% | +74% from low-38% from high | |
| 58Moderate | William Snider director buy | $104k 21,000 shares | +191% | +79% from low-37% from high | |
| 56Moderate | John D Duke Chief Executive Officer buy | $25k 5,000 shares | +5% | +79% from low-37% from high |
Transactions
Every row filed, 33 in all.
| Date | Insider | Transaction | Shares | Price | Value | Holdings after | Filed |
|---|---|---|---|---|---|---|---|
| Jun 9, 2026 | Katherine A. Eade director | AGrant or award Common Stock | +16,556 | $0.00 | $0 | 58,669 | Jun 12, 2026 |
| Jun 9, 2026 | Stephen J Denelsky director | AGrant or award Common Stock | +16,556 | $0.00 | $0 | 37,556 | Jun 11, 2026 |
| Jun 9, 2026 | Seth Benjamin Benson director | AGrant or award Common Stock | +16,556 | $0.00 | $0 | 27,556 | Jun 11, 2026 |
| Jun 9, 2026 | William Snider director | AGrant or award Common Stock | +16,556 | $0.00 | $0 | 48,556 | Jun 11, 2026 |
| Jun 9, 2026 | Robert E. Gagnon director | AGrant or award Common Stock | +16,556 | $0.00 | $0 | 27,556 | Jun 11, 2026 |
| Mar 20, 2026 | Mark T Frost Chief Financial Officer | AGrant or award Common Stock | +30,000 | $0.00 | $0 | 47,500 | Apr 1, 2026 |
| Mar 16, 2026 | Mark T Frost Chief Financial Officer | POpen-market purchase Common Stock | +5,000 | $5.00 | $25k | 17,500 | Apr 1, 2026 |
| Mar 20, 2026 | John D Duke Chief Executive Officer | AGrant or award Common Stock | +75,000 | $0.00 | $0 | 180,000 | Mar 23, 2026 |
| Mar 17, 2026 | Stephen J Denelsky director | POpen-market purchase Common Stock | +10,000 | $4.87 | $49k | 21,000 | Mar 18, 2026 |
| Mar 16, 2026 | William Snider director | POpen-market purchase Common Stock | +12,525 | $4.99 | $62k | 23,525 | Mar 18, 2026 |
| Mar 17, 2026 | William Snider director | POpen-market purchase Common Stock | +8,475 | $4.85 | $41k | 32,000 | Mar 18, 2026 |
| Mar 16, 2026 | John D Duke Chief Executive Officer | POpen-market purchase Common Stock | +5,000 | $5.01 | $25k | 105,000 | Mar 17, 2026 |
| Dec 17, 2025 | William Snider director | AGrant or award Common Stock | +110,000 | $0.00 | $0 | 110,000 | Dec 30, 2025 |
| Sep 5, 2025 | Stephen J Denelsky director | AGrant or award Common Stock | +110,000 | $0.00 | $0 | 110,000 | Oct 7, 2025 |
| Aug 15, 2025 | James W Green Chief Executive Officer | DDisposition to issuer Common Stock | -49,048 | $0.00 | $0 | 2,796,040 | Aug 19, 2025 |
| Aug 15, 2025 | James W Green Chief Executive Officer | FTax withholding Common Stock | -33,200 | $0.53 | $18k | 2,762,840 | Aug 19, 2025 |
| Aug 15, 2025 | James W Green Chief Executive Officer | DDisposition to issuer Common Stock | -119,332 | $0.00 | $0 | 2,643,508 | Aug 19, 2025 |
| Aug 15, 2025 | James W Green Chief Executive Officer | FTax withholding Common Stock | -11,540 | $0.53 | $6,105 | 2,631,968 | Aug 19, 2025 |
| Aug 15, 2025 | James W Green Chief Executive Officer | DDisposition to issuer Common Stock | -66,036 | $0.00 | $0 | 2,565,905 | Aug 19, 2025 |
| Aug 15, 2025 | James W Green Chief Executive Officer | DDisposition to issuer Common Stock | -113,366 | $0.00 | $0 | 2,452,566 | Aug 19, 2025 |
| Aug 8, 2025 | John D Duke Chief Executive Officer | AGrant or award Common Stock | +500,000 | $0.00 | $0 | 500,000 | Aug 11, 2025 |
| Aug 8, 2025 | John D Duke Chief Executive Officer | AGrant or award Common Stock | +500,000 | $0.00 | $0 | 1,000,000 | Aug 11, 2025 |
| Jul 16, 2025 | Seth Benjamin Benson director | AGrant or award Common Stock | +110,000 | $0.00 | $0 | 110,000 | Jul 25, 2025 |
| Jul 16, 2025 | Katherine A. Eade director | AGrant or award Common Stock | +110,000 | $0.00 | $0 | 421,126 | Jul 18, 2025 |
| Jul 16, 2025 | Robert E. Gagnon director | AGrant or award Common Stock | +110,000 | $0.00 | $0 | 110,000 | Jul 18, 2025 |
| May 12, 2025 | Mark T Frost Interim CFO | AGrant or award Common Stock | +100,000 | $0.00 | $0 | 125,000 | May 14, 2025 |
| Mar 19, 2025 | Jennifer Cote Chief Financial Officer | FTax withholding Common Stock | -5,687 | $0.69 | $3,916 | 159,019 | Mar 21, 2025 |
| Mar 19, 2025 | James W Green Chief Executive Officer | FTax withholding Common Stock | -38,413 | $0.69 | $26k | 2,845,088 | Mar 21, 2025 |
| Dec 31, 2024 | James W Green Chief Executive Officer | DDisposition to issuer Common Stock | -145,365 | $0.00 | $0 | 2,883,501 | Jan 3, 2025 |
| Dec 29, 2024 | Jennifer Cote Chief Financial Officer | FTax withholding Common Stock | -4,731 | $1.98 | $9,367 | 164,007 | Dec 31, 2024 |
| Dec 29, 2024 | James W Green Chief Executive Officer | FTax withholding Common Stock | -56,915 | $1.98 | $113k | 3,054,176 | Dec 31, 2024 |
| Dec 29, 2024 | Jennifer Cote Chief Financial Officer | FTax withholding Common Stock | -3,797 | $1.98 | $7,518 | 160,210 | Dec 31, 2024 |
| Dec 29, 2024 | James W Green Chief Executive Officer | FTax withholding Common Stock | -25,310 | $1.98 | $50k | 3,028,866 | Dec 31, 2024 |
Insiders
Everyone who has filed a Form 4 here.
- Seth Benjamin Bensondirector
- Jennifer CoteChief Financial Officer
- Stephen J Denelskydirector
- John D DukeChief Executive Officer
- Katherine A. Eadedirector
- Mark T FrostChief Financial Officer
- Robert E. Gagnondirector, cfo, officer
- James W GreenChief Executive Officer
- William Sniderdirector
Questions about HBIO
Answered from the filings on this page, as of the latest one.
Are insiders buying HBIO?
No. In the last 90 days no insider at HARVARD BIOSCIENCE INC bought or sold shares on the open market according to SEC Form 4 filings. The rows on file from that period are grants, exercises, tax withholding or other transactions, which carry no view on the price.
Who was the last insider to trade HBIO on the open market?
Mark T Frost (Chief Financial Officer) bought $25k of HBIO on Mar 16, 2026 and filed the Form 4 on Apr 1, 2026. InsiderTell scored 56 (moderate), with 4 insiders on the same side within 14 days.
How many insiders file Form 4 at HARVARD BIOSCIENCE INC?
9 people have filed a Form 4 at HARVARD BIOSCIENCE INC, among them Seth Benjamin Benson (director), Jennifer Cote (Chief Financial Officer), Stephen J Denelsky (director). Officers, directors and holders of more than 10% of a share class must report their trades within two business days.
Not investment advice. Scores and forward returns are decision support built from public SEC filings and past prices; they describe what happened after comparable filings, not what will happen after this one. Do your own research and size your risk.