As of the latest Form 4 filed Jul 7, 2026.
What Korro Bio, Inc. insiders — officers, directors and 10% owners — have bought and sold in their own stock, straight from their SEC Form 4 filings. Values are shares × the reported transaction price where both are disclosed.
Buys plotted up, sells down; bar height is the disclosed dollar value (shares × reported price). Our Form 4 history is only complete from mid-2026, so early months are sparse — the series fills in as more filings land. Open-market purchases and sales only.
Newest filing first — the 30 most recent filings for KRRO.
| Filed | Trade date | Insider | Transaction | Shares | Price | Value | 10b5-1 | Filing |
|---|---|---|---|---|---|---|---|---|
| 2026-07-07 | 2026-07-06 | FORMELA JEAN FRANCOIS Director | SSale | −8.51K | $13.96 | $119K | Yes (planned) | Form 4 ↗ |
| 2026-07-07 | 2026-07-06 | FORMELA JEAN FRANCOIS, Director | SSale | −817.00 | $13.96 | $11.4K | Yes (planned) | Form 4 ↗ |
| 2026-07-07 | 2026-07-02 | FORMELA JEAN FRANCOIS, Director | SSale | −14.7K | $14.03 | $207K | Yes (planned) | Form 4 ↗ |
| 2026-07-07 | 2026-07-02 | FORMELA JEAN FRANCOIS, Director | SSale | −86.0K | $14.03 | $1.21M | Yes (planned) | Form 4 ↗ |
| 2026-06-24 | 2026-06-24 | FORMELA JEAN FRANCOIS Director | SSale | −114.00 | $14.98 | $1.71K | Yes (planned) | Form 4 ↗ |
| 2026-06-24 | 2026-06-24 | FORMELA JEAN FRANCOIS, Director | SSale | −6.98K | $14.60 | $102K | Yes (planned) | Form 4 ↗ |
| 2026-06-24 | 2026-06-24 | FORMELA JEAN FRANCOIS, Director | SSale | −666.00 | $14.98 | $9.98K | Yes (planned) | Form 4 ↗ |
| 2026-06-24 | 2026-06-24 | FORMELA JEAN FRANCOIS, Director | SSale | −40.7K | $14.60 | $594K | Yes (planned) | Form 4 ↗ |
| 2026-06-24 | 2026-06-23 | FORMELA JEAN FRANCOIS, Director | SSale | −17.4K | $14.25 | $248K | Yes (planned) | Form 4 ↗ |
| 2026-06-24 | 2026-06-23 | FORMELA JEAN FRANCOIS, Director | SSale | −102K | $14.25 | $1.45M | Yes (planned) | Form 4 ↗ |
| 2026-06-24 | 2026-06-22 | FORMELA JEAN FRANCOIS, Director | SSale | −580.00 | $13.95 | $8.09K | Yes (planned) | Form 4 ↗ |
| 2026-06-24 | 2026-06-22 | FORMELA JEAN FRANCOIS, Director | SSale | −3.38K | $13.95 | $47.2K | Yes (planned) | Form 4 ↗ |
| 2026-06-17 | 2026-06-16 | Chappell Todd Chief Operating Officer | SSale | −3.17K | $10.83 | $34.3K | No | Form 4 ↗ |
| 2026-06-17 | 2026-06-16 | Vincent Loic A Chief Scientific Officer | SSale | −3.42K | $10.83 | $37.0K | No | Form 4 ↗ |
| 2026-06-17 | 2026-06-16 | Cerio Jeffrey General Counsel | SSale | −6.61K | $10.83 | $71.6K | No | Form 4 ↗ |
| 2026-06-17 | 2026-06-16 | Dolan Oliver Senior Vice President, Finance | SSale | −3.38K | $10.83 | $36.6K | No | Form 4 ↗ |
| 2026-06-02 | 2026-05-29 | Aiyar Ram President and CEO | SSale | −15.2K | $12.98 | $197K | No | Form 4 ↗ |
| 2026-06-01 | 2026-05-28 | FORMELA JEAN FRANCOIS Director | SSale | −419.00 | $13.95 | $5.85K | Yes (planned) | Form 4 ↗ |
| 2026-06-01 | 2026-05-28 | FORMELA JEAN FRANCOIS, Director | SSale | −2.44K | $13.95 | $34.1K | Yes (planned) | Form 4 ↗ |
| 2026-05-28 | 2026-05-26 | Aiyar Ram President and CEO | AAward | +50.0K | $12.33 | $617K | No | Form 4 ↗ |
| 2026-03-12 | 2026-03-10 | Yang Rick 10% owner | PPurchase | +207K | $11.11 | $2.30M | No | Form 4 ↗ |
| 2026-03-12 | 2026-03-10 | SANDELL SCOTT D 10% owner | PPurchase | +207K | $11.11 | $2.30M | No | Form 4 ↗ |
| 2026-03-12 | 2026-03-10 | New Enterprise Associates 17, L.P. 10% owner | PPurchase | +207K | $11.11 | $2.30M | No | Form 4 ↗ |
| 2026-03-12 | 2026-03-10 | Behbahani Ali Director | AAward | +207K | $11.11 | $2.30M | No | Form 4 ↗ |
| 2026-03-12 | 2026-03-10 | Chang Carmen 10% owner | PPurchase | +207K | $11.11 | $2.30M | No | Form 4 ↗ |
| 2026-03-12 | 2026-03-10 | BASKETT FOREST 10% owner | PPurchase | +207K | $11.11 | $2.30M | No | Form 4 ↗ |
| 2026-03-12 | 2026-03-10 | Mathers Edward T 10% owner | PPurchase | +207K | $11.11 | $2.30M | No | Form 4 ↗ |
| 2026-03-12 | 2026-03-10 | Walker Paul Edward 10% owner | PPurchase | +207K | $11.11 | $2.30M | No | Form 4 ↗ |
| 2026-03-12 | 2026-03-10 | Makhzoumi Mohamad 10% owner | PPurchase | +207K | $11.11 | $2.30M | No | Form 4 ↗ |
| 2026-03-12 | 2026-03-10 | Florence Anthony A. Jr. 10% owner | PPurchase | +207K | $11.11 | $2.30M | No | Form 4 ↗ |
Insiders — a company’s officers, directors and holders of more than 10% of its stock — must report any trade in that stock to the SEC on a Form 4 within two business days. Each row here is one transaction from those filings.
The transaction code tells you what happened: Purchase (P) and Sale (S) are open-market trades — the ones markets watch most; Award (A) is a granted stock or unit, Option exercise (M) converts options into shares, and Gift (G) is a transfer for no consideration. Awards, exercises and gifts are largely compensation or administrative, not a directional bet.
One caveat on sales: many are made under a Rule 10b5-1 plan scheduled months in advance, so a sale is not automatically a bearish signal. Insider activity is a noisy input — read it alongside the filings, not on its own.
See also KRRO’s full analysis or the market-wide insider trading feed. The tabs above jump to KRRO’s other SEC data.
Source: SEC Form 4 filings for KRRO, parsed from EDGAR. Transaction prices are as reported in the filing — SEC public-domain data, not market quotes. Values are shares × reported price where both are disclosed; grants and gifts often carry no price. A delayed record of what insiders reported, not a live position or a recommendation.
Research and education only — not financial advice. TENKis not a registered investment adviser or broker-dealer and gives no personalized advice. Every call is impersonal — identical for all users, generated on a schedule from SEC filings plus a delayed/third-party price feed — may be wrong or out of date, and is not a recommendation to buy or sell any security. The operator and an affiliated trading operation may hold or trade the securities TENK rates; see Disclosures. Past performance does not guarantee future results. Do your own research.