Company profile
Korro Bio, Inc. Insider Trading
KRROEvery SEC Form 4 insider trading filing for Korro Bio, Inc. (KRRO) since April 2023 — open-market buys and sells by directors and officers, option exercises, and cluster activity, updated as each filing is reported to the SEC. Why 2023?
- Exchange
- Nasdaq
- Sector
- Pharmaceutical Preparations
- CIK
- 0001703647
- Filings
- 144
- Insiders
- 34
- Last filing
- 2026-09-14
Activity summary
No discretionary insider buying or selling in the last 30 days. The 9 transactions filed were made under a 10b5-1 plan, scheduled in advance rather than decided on the day.
Three year balance
Buy and sell value by quarter, Q4 23 to Q3 26. Korro Bio, Inc. insiders are net buyers across the period shown.
Bars below the rule are sales, above are purchases. Largest quarter on the chart is $50.0M.
90 day insight
Over the last 90 days, Korro Bio, Inc. insiders bought $79K (6 transactions) and sold $63K (1 transaction).
- Most active insider: Jean Francois Formela with 18 transactions totaling $3.4M.
- Largest single sale: $1.2M by Jean Francois Formela on Jul 2, 2026.
- 95% of recent sales were pre-scheduled 10b5-1 trades — typically less informative than open-market activity.
Activity skews bullish — buys outpace sales.
Insider Transactions
Sourced from SEC EDGAR Form 4 filings. Updated hourly.
| Date | Insider | Company | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Sep 14, 2026 | Jean Francois Formela | KRRO | Sale10b5 | 31,888 | $14.12 | $450K |
| Sep 14, 2026 | Jean Francois Formela | KRRO | Sale10b5 | 6,602 | $14.12 | $93K |
| Sep 11, 2026 | Oliver Dolan | KRRO | Sale10b5 | 5 | $13.72 | $69 |
| Sep 11, 2026 | Jean Francois Formela | KRRO | Sale10b5 | 8,450 | $13.99 | $118K |
| Sep 11, 2026 | Jean Francois Formela | KRRO | Sale10b5 | 1,750 | $13.99 | $24K |
45 more transactions hidden
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By total value filed.
Institutional Ownership
Top 13F-HR holders of Korro Bio, Inc. as of 2026-06-30
Data source: quarterly 13F-HR filings — institutional holders report positions within 45 days of quarter end. Joined with insider activity above — see who's loading up institutionally while insiders are trading. Full 13F-HR API →