← United States · Coverage record
US · SEC FORM 4
89bio, Inc.
ETNB · — · CIK 0001785173 · Healthcare
INSIDER SIGNAL
0 qualifying P purchase groups
in the current 180-day scoring window
0 Form 4 transaction lines observed in the same window
0 sales · 0 option, withholding, award, gift or other lines
WHY NO ACTIVE SIGNAL?
Score anatomy
No score is calculated because there is no qualifying purchase in the active window. Unavailable inputs are not treated as zero or as a bearish signal.
Why is there no score?
- No qualifying open-market purchase supplies cluster, size, role, recency or conviction inputs.
- Sales and other Form 4 activity remain visible as context and do not create a negative score.
Sales and other Form 4 activity are shown separately and do not create a negative buy signal. Absence of buying is not scored as bearish.
Insider activity timeline
No Form 4 transaction event is present in the current 180-day window.
Purchase breadth, concentration & cluster buying
These modules activate when qualifying purchases enter the 180-day research window.
SIGNAL HISTORY
Scores are archived only when the company qualifies for a published US buy-signal snapshot. Last qualifying purchase: 2025-01-30 · Kolchinsky Peter; RA CAPITAL MANAGEMENT, L.P.; RA Capital Healthcare Fund LP; RA Capital Nexus Fund, L.P.; Shah Rajeev M..
Recent Form 4 activity
P is an open-market or private purchase. S is a sale. M, F, A and G usually describe exercises, tax withholding, awards and gifts. These categories remain visually separate.
Market context
Market context has not been captured for this ticker yet. The daily market-context job processes the US universe in rotating batches.
Short interest
The FINRA report lists no short interest for this ticker.
FINRA settlement date: 2026-09-30 · Captured 2026-10-12 · FINRA equity short interest ↗. A share count, published about a week after each of two settlement dates a month; not a percentage of shares outstanding.
Historical equity purchases
Qualifying code P transactions in the local Form 4 history, including purchases outside the current signal window.
| Transaction date | Reporting owner | Type | Security | Shares | Avg. price | Approx. value | Source |
|---|---|---|---|---|---|---|---|
| 2025-01-30 | Kolchinsky Peter; RA CAPITAL MANAGEMENT, L.P.; RA Capital Healthcare Fund LP; RA Capital Nexus Fund, L.P.; Shah Rajeev M. | Purchase (P) | Common Stock | 5,714,285 | USD 8.75 | USD 49,999,994 | SEC filing ↗ |
| 2025-01-22 | McWherter Charles | Purchase (P) | Common Stock | 10,000 | USD 6.71 | USD 67,100 | SEC filing ↗ |
| 2025-01-21 | McWherter Charles | Purchase (P) | Common Stock | 5,000 | USD 6.55 | USD 32,750 | SEC filing ↗ |
| 2024-12-06 | PALEKAR ROHAN | Purchase (P) | Common Stock | 5,000 | USD 7.89 | USD 39,450 | SEC filing ↗ |
| 2024-12-05 | McWherter Charles | Purchase (P) | Common Stock | 10,000 | USD 8.00 | USD 80,000 | SEC filing ↗ |
| 2024-11-22 | PALEKAR ROHAN | Purchase (P) | Common Stock | 10,000 | USD 8.35 | USD 83,500 | SEC filing ↗ |
| 2024-03-04 | Kolchinsky Peter; RA CAPITAL MANAGEMENT, L.P.; RA Capital Healthcare Fund LP; RA Capital Nexus Fund, L.P.; Shah Rajeev M. | Purchase (P) | Common Stock | 1,350,000 | USD 15.35 | USD 20,722,500 | SEC filing ↗ |
| 2023-03-28 | Hayden Michael R | Purchase (P) | Common Stock | 61,538 | USD 16.15 | USD 993,839 | SEC filing ↗ |
| 2023-03-24 | Kolchinsky Peter; RA CAPITAL MANAGEMENT, L.P.; RA Capital Healthcare Fund LP; RA Capital Nexus Fund, L.P.; Shah Rajeev M. | Purchase (P) | Common Stock | 2,461,538 | USD 16.25 | USD 39,999,992 | SEC filing ↗ |
| 2022-10-18 | Kolchinsky Peter; RA CAPITAL MANAGEMENT, L.P.; RA Capital Healthcare Fund LP; RA Capital Nexus Fund, L.P.; Shah Rajeev M. | Purchase (P) | Common Stock | 1,172,741 | USD 7.65 | USD 8,971,469 | SEC filing ↗ |
| 2022-07-01 | Kolchinsky Peter; RA CAPITAL MANAGEMENT, L.P.; RA Capital Healthcare Fund LP; RA Capital Nexus Fund, L.P.; Shah Rajeev M. | Purchase (P) | Common Stock | 2,816,900 | USD 3.55 | USD 9,999,995 | SEC filing ↗ |
| 2022-04-25 | Hayden Michael R | Purchase (P) | Common Stock | 10,000 | USD 2.67 | USD 26,700 | SEC filing ↗ |
| 2022-04-07 | Hayden Michael R | Purchase (P) | Common Stock | 10,000 | USD 3.48 | USD 34,800 | SEC filing ↗ |
| 2022-03-30 | Hayden Michael R | Purchase (P) | Common Stock | 6,250 | USD 3.62 | USD 22,625 | SEC filing ↗ |
| 2022-01-28 | PALEKAR ROHAN | Purchase (P) | Common Stock | 2,500 | USD 6.14 | USD 15,350 | SEC filing ↗ |
Form 4 evidence
18 transaction lines in the latest 365-day window; 272 in local history.
| Date | Owner | Type | Security | Shares | Avg. price | Approx. value | Source |
|---|---|---|---|---|---|---|---|
| 2025-10-30 | Kolchinsky Peter; RA CAPITAL MANAGEMENT, L.P.; RA Capital Healthcare Fund LP; RA Capital Nexus Fund, L.P.; Shah Rajeev M. | D (D) | Common Stock | 19,889,683 | USD — | USD — | SEC filing ↗ |
| 2025-10-30 | Sarena Francis Willard | U (U) | Common Stock | 75,310 | USD — | USD — | SEC filing ↗ |
| 2025-10-30 | PALEKAR ROHAN | U (U) | Common Stock | 934,273 | USD — | USD — | SEC filing ↗ |
Show recent Form 4 evidence (13 grouped rows)
| Date | Owner | Type | Security | Shares | Avg. price | Approx. value | Source |
|---|---|---|---|---|---|---|---|
| 2025-10-30 | Kolchinsky Peter; RA CAPITAL MANAGEMENT, L.P.; RA Capital Healthcare Fund LP; RA Capital Nexus Fund, L.P.; Shah Rajeev M. | D (D) | Common Stock | 19,889,683 | USD — | USD — | SEC filing ↗ |
| 2025-10-30 | Sarena Francis Willard | U (U) | Common Stock | 75,310 | USD — | USD — | SEC filing ↗ |
| 2025-10-30 | PALEKAR ROHAN | U (U) | Common Stock | 934,273 | USD — | USD — | SEC filing ↗ |
| 2025-10-30 | PALEKAR ROHAN | Award / grant (A) | Common Stock | 125,000 | USD 0.00 | USD 0 | SEC filing ↗ |
| 2025-10-30 | McWherter Charles | U (U) | Common Stock | 25,000 | USD — | USD — | SEC filing ↗ |
| 2025-10-30 | Martins Ryan | U (U) | Common Stock | 374,295 | USD — | USD — | SEC filing ↗ |
| 2025-10-30 | Martins Ryan | Award / grant (A) | Common Stock | 35,000 | USD 0.00 | USD 0 | SEC filing ↗ |
| 2025-10-30 | Mansbach Harry H | U (U) | Common Stock | 352,656 | USD — | USD — | SEC filing ↗ |
| 2025-10-30 | Mansbach Harry H | Award / grant (A) | Common Stock | 50,000 | USD 0.00 | USD 0 | SEC filing ↗ |
| 2025-10-30 | Le-Nguyen Quoc | U (U) | Common Stock | 365,378 | USD — | USD — | SEC filing ↗ |
| 2025-10-30 | Le-Nguyen Quoc | Award / grant (A) | Common Stock | 50,000 | USD 0.00 | USD 0 | SEC filing ↗ |
| 2025-10-30 | Hayden Michael R | U (U) | Common Stock | 246,420 | USD — | USD — | SEC filing ↗ |
| 2025-10-22 | Martins Ryan | Option exercise / conversion (M) | Common Stock | 80,799 | USD 3.17 | USD 256,469 | SEC filing ↗ |
Multiple price lines in one filing are grouped and share-weighted. Price and value are blank when a grouped filing line lacks price evidence.
Snapshot & identity
| Snapshot date | 2026-10-18 |
|---|---|
| Ranking version | US-v1.2 |
| Data quality | PASS ELIGIBLE · — |
| Ticker | ETNB |
| CIK | 0001785173 |
| Sector | Healthcare |
| Industry | — Yahoo Finance |
| SEC SIC | 2834 Pharmaceutical Preparations |
| Exchange | — |
Data coverage
| Local Form 4 history | 272 transaction lines from 2020-07-08 to 2025-10-30 26 P purchase lines · 44 S sale lines · 202 other lines |
|---|---|
| SEC company submissions | Open SEC filings ↗ |
Local ledger as of 2026-10-18. Mapping status is an audit field and does not erase SEC filing evidence.