ETNB insider buying – 89bio, Inc.
22 insider purchases since 2016 worth $233.4M by 11 different insiders. Last 12 months: 0 purchases, $0. Most recent filing: 2025-02-03.
Same time range as the chart above - each mark sits under the week of the trade. Circles = purchases (height = price paid, size = amount), red triangles = open-market sales of $50k+. Prices as reported, not adjusted for later stock splits. 8 older purchases (before the 5-year window) are listed in the table below.
Purchases are open-market buys (SEC Form 4, code "P") - insiders paying with their own money. Sales are open-market sales (code "S") of $50,000 or more; many sales are pre-planned (Rule 10b5-1) or made for taxes and diversification. Each row links to the original filing.
Bought, sold, still holding?
| Insider | Bought | First / last buy | Sold since 2016 | Holds now* | Status |
|---|---|---|---|---|---|
| Kolchinsky Peter Director | $78.3M 3× · 7,339,285 sh | 2020-07-08 2025-01-30 | – | 19,554,319 shares as of 2025-02-03 | Holds - never sold |
| RA CAPITAL MANAGEMENT, L.P. Director | $76.4M 2× · 3,761,538 sh | 2020-09-17 2023-03-24 | – | 11,081,584 shares as of 2023-03-30 | Holds - never sold |
| RA Capital Healthcare Fund LP Director | $28.3M 3× · 1,729,555 sh | 2019-11-11 2021-06-02 | – | 4,965,769 shares as of 2021-06-04 | Holds - never sold |
| RA Capital Nexus Fund, L.P. Director | $19.0M 2× · 3,989,641 sh | 2022-07-01 2022-10-18 | – | 8,955,410 shares as of 2022-10-20 | Holds - never sold |
| OrbiMed Advisors Israel II Ltd Director | $13.4M 1× · 837,500 sh | 2019-11-11 2019-11-11 | 1× · $592,384 last 2022-01-25 | 1,840,175 shares as of 2022-01-27 | Sold part |
| Longitude Venture Partners III, L.P. 10% Owner | $9.2M 1× · 575,000 sh | 2019-11-11 2019-11-11 | – | 891 shares as of 2020-11-18 | Holds - never sold |
| Pontifax Management 4 G.P. (2015) Ltd. Director | $4.0M 1× · 250,000 sh | 2019-11-11 2019-11-11 | – | 250,000 shares as of 2019-11-13 | Holds - never sold |
| Grunberg Gregory Director | $3.0M 1× · 109,090 sh | 2020-07-10 2020-07-10 | – | 1,750,877 shares as of 2021-04-23 | Holds - never sold |
| Hayden Michael R Director | $1.4M 2× · 106,538 sh | 2019-11-11 2022-03-30 | – | 0 shares as of 2025-10-30 | Sold everything |
| PALEKAR ROHAN CEO | $293,650 4× · 29,500 sh | 2021-07-07 2024-12-06 | 4× · $1.7M last 2024-04-01 | 934,273 shares as of 2025-10-30 | Holds (sold earlier) |
| McWherter Charles Director | $179,850 2× · 25,000 sh | 2024-12-05 2025-01-21 | – | 0 shares as of 2025-10-30 | Sold everything |
* Shares held after the insider's most recent SEC filing for this company (all share classes, direct and indirect). If an insider stops filing, later changes are not known.
Insider buying and selling by year
| Year | Purchases | Bought | Buyers | Sales | Sold |
|---|---|---|---|---|---|
| 2025 | 2 | $50.1M | 2 | 3 | $277,638 |
| 2024 | 4 | $20.9M | 3 | 3 | $1.4M |
| 2023 | 2 | $41.1M | 2 | 9 | $1.6M |
| 2022 | 3 | $19.0M | 2 | 1 | $592,384 |
| 2021 | 3 | $4.4M | 2 | 13 | $1.9M |
| 2020 | 3 | $47.0M | 3 | 4 | $8.2M |
| 2019 | 5 | $50.9M | 5 | – | – |
Insider purchases
| Filed | Insider | Role | Shares | Avg price | Value | Holdings | Filing |
|---|---|---|---|---|---|---|---|
| 2025-02-03 | Kolchinsky Peter | Director | 5,714,285 | $8.75 | $50.0M | +41.3% | SEC |
| 2025-01-23 | McWherter Charles | Director | 15,000 | $6.66 | $99,850 | +150.0% | SEC |
| 2024-12-10 | PALEKAR ROHAN | CEO | 5,000 | $7.89 | $39,450 | +1.1% | SEC |
| 2024-12-09 | McWherter Charles | Director | 10,000 | $8.00 | $80,000 | SEC | |
| 2024-11-25 | PALEKAR ROHAN | CEO | 10,000 | $8.35 | $83,500 | +2.2% | SEC |
| 2024-03-06 | Kolchinsky Peter | Director | 1,350,000 | $15.35 | $20.7M | +12.2% | SEC |
| 2023-03-30 | RA CAPITAL MANAGEMENT, L.P. | Director | 2,461,538 | $16.25 | $40.0M | +28.6% | SEC |
| 2023-03-30 | Hayden Michael R | Director | 87,788 | $12.28 | $1.1M | +542.2% | SEC |
| 2022-10-20 | RA Capital Nexus Fund, L.P. | Director | 1,172,741 | $7.65 | $9.0M | +15.1% | SEC |
| 2022-07-06 | RA Capital Nexus Fund, L.P. | Director | 2,816,900 | $3.55 | $10.0M | +56.7% | SEC |
| 2022-01-31 | PALEKAR ROHAN | CEO | 7,500 | $7.05 | $52,850 | +19.6% | SEC |
| 2021-07-08 | PALEKAR ROHAN | CEO | 7,000 | $16.84 | $117,850 | +23.3% | SEC |
| 2021-06-04 | RA Capital Healthcare Fund LP | Director | 22,138 | $18.77 | $415,530 | +0.4% | SEC |
| 2021-05-28 | RA Capital Healthcare Fund LP | Director | 207,417 | $18.60 | $3.9M | +4.4% | SEC |
| 2020-09-21 | RA CAPITAL MANAGEMENT, L.P. | Director | 1,300,000 | $28.00 | $36.4M | +37.8% | SEC |
| 2020-07-14 | Grunberg Gregory | Director | 109,090 | $27.50 | $3.0M | +4.4% | SEC |
| 2020-07-10 | Kolchinsky Peter | Director | 275,000 | $27.50 | $7.6M | +8.7% | SEC |
| 2019-11-13 | RA Capital Healthcare Fund LP | Director | 1,500,000 | $16.00 | $24.0M | SEC | |
| 2019-11-13 | Pontifax Management 4 G.P. (2015) Ltd. | Director | 250,000 | $16.00 | $4.0M | SEC | |
| 2019-11-13 | OrbiMed Advisors Israel II Ltd | Director | 837,500 | $16.00 | $13.4M | SEC | |
| 2019-11-13 | Longitude Venture Partners III, L.P. | 10% Owner | 575,000 | $16.00 | $9.2M | SEC | |
| 2019-11-13 | Hayden Michael R | Director | 18,750 | $16.00 | $300,000 | SEC |
Insider sales
| Filed | Insider | Role | Shares | Avg price | Value | Type | Filing |
|---|---|---|---|---|---|---|---|
| 2025-07-17 | Le-Nguyen Quoc | Officer | 10,461 | $11.02 | $115,280 | Sale | SEC |
| 2025-04-17 | Le-Nguyen Quoc | Officer | 15,329 | $5.95 | $91,208 | Sale | SEC |
| 2025-01-17 | Le-Nguyen Quoc | Officer | 10,963 | $6.49 | $71,150 | Sale | SEC |
| 2024-11-01 | Le-Nguyen Quoc | Officer | 27,955 | $8.12 | $226,995 | Sale | SEC |
| 2024-04-03 | PALEKAR ROHAN | CEO | 52,718 | $10.91 | $575,153 | Sale | SEC |
| 2024-01-03 | PALEKAR ROHAN | CEO | 50,000 | $11.20 | $560,000 | Sale | SEC |
| 2023-07-18 | LAPORTE KATHLEEN | Director | 12,500 | $18.80 | $235,000 | Sale | SEC |
| 2023-06-07 | PALEKAR ROHAN | CEO | 15,000 | $20.00 | $300,000 | Sale | SEC |
| 2023-06-05 | Atkinson Edward Morrow III | Director | 6,250 | $17.91 | $111,938 | Sale | SEC |
| 2023-05-11 | Le-Nguyen Quoc | Officer | 13,683 | $18.11 | $247,799 | Sale | SEC |
| 2023-04-06 | Martins Ryan | CFO | 8,721 | $14.95 | $130,379 | Sale | SEC |
| 2023-03-27 | PALEKAR ROHAN | CEO | 15,000 | $16.00 | $240,000 | Sale | SEC |
| 2023-03-27 | Martins Ryan | CFO | 5,000 | $16.11 | $80,550 | Sale | SEC |
| 2023-03-03 | Atkinson Edward Morrow III | Director | 10,000 | $13.60 | $136,000 | Sale | SEC |
| 2023-01-05 | Martins Ryan | CFO | 5,947 | $12.51 | $74,397 | Sale | SEC |
Showing the latest 15 of 33 sales of $50,000+ since 2016.
Compiled automatically from public SEC filings. Not investment advice. Get every new insider purchase in the daily report.
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