Jean Francois Formela insider trades: Korro Bio (KRRO) stock buys and sales
Trades on the price chart
Daily close, with an arrow on each day they bought or sold
Companies
Where Jean reports to the SEC
and 6 more companies
Open-market buys and sales
31 trades reported on SEC Form 4, newest first
| Date | Stock | Type | Shares | Price | Value | Holding | Reported |
|---|---|---|---|---|---|---|---|
| Sep 14, 2026 | KRRO | ↓ Sell | 48,690 | $14.09 | $686K | Indirect | Sep 15, 2026 (1d) |
| Aug 26, 2026 | KRRO | ↓ Sell | 300 | $13.96 | $4K | Indirect | Aug 28, 2026 (2d) |
| Aug 19, 2026 | KRRO | ↓ Sell | 28,468 | $14.00 | $399K | Indirect | Aug 21, 2026 (2d) |
| Aug 11, 2026 | KRRO | ↓ Sell | 2,143 | $13.96 | $30K | Indirect | Aug 13, 2026 (2d) |
| Jul 6, 2026 | KRRO | ↓ Sell | 110,023 | $14.02 | $1.5M | Indirect | Jul 7, 2026 (1d) |
| Jun 24, 2026 | KRRO | ↓ Sell | 171,405 | $14.34 | $2.5M | Indirect | Jun 24, 2026 (0d) |
| Dec 14, 2021 | IKNA | ↓ Sell | 26,278 | $14.67 | $386K | Indirect | Dec 14, 2021 (0d) |
| Sep 14, 2021 | TBIO | ↓ Sell | 2,055,063 | $38.00 | $78.1M | Indirect | Sep 14, 2021 (0d) |
| Jun 28, 2021 | NTLA | ↓ Sell | 553,376 | $132.73 | $73.4M | Indirect | Jun 29, 2021 (1d) |
| Jun 14, 2021 | NTLA | ↓ Sell | 201,725 | $87.04 | $17.6M | Indirect | Jun 15, 2021 (1d) |
| Apr 29, 2021 | NTLA | ↓ Sell | 4,513 | $85.43 | $386K | Indirect | Apr 30, 2021 (1d) |
| Apr 28, 2021 | NTLA | ↓ Sell | 342,962 | $85.96 | $29.5M | Indirect | Apr 28, 2021 (0d) |
| Apr 5, 2021 | NTLA | ↓ Sell | 800 | $84.98 | $68K | Indirect | Apr 7, 2021 (2d) |
| Mar 30, 2021 | IKNA | ↑ Buy | 125,000 | $16.00 | $2.0M | Indirect | Dec 14, 2021 (259d) |
| Feb 26, 2021 | NTLA | ↓ Sell | 501,945 | $60.29 | $30.3M | Indirect | Mar 1, 2021 (3d) |
| Dec 22, 2020 | TBIO | ↓ Sell | 139,101 | $25.25 | $3.5M | Indirect | Dec 23, 2020 (1d) |
| Aug 27, 2020 | TBIO | ↓ Sell | 88,888 | $14.83 | $1.3M | Indirect | Aug 27, 2020 (0d) |
| Jul 16, 2018 | NTLA | ↓ Sell10b5-1 | 6,686 | $31.17 | $208K | Indirect | Jul 18, 2018 (2d) |
| Jun 19, 2018 | NTLA | ↓ Sell10b5-1 | 6,686 | $27.96 | $187K | Indirect | Jun 20, 2018 (1d) |
| May 16, 2018 | NTLA | ↓ Sell10b5-1 | 6,686 | $25.04 | $167K | Indirect | May 17, 2018 (1d) |
| Mar 20, 2018 | NTLA | ↓ Sell | 39,245 | $23.87 | $937K | Indirect | Mar 22, 2018 (2d) |
| Nov 6, 2017 | SPRO | ↑ Buy | 428,571 | $14.00 | $6.0M | Indirect | Nov 7, 2017 (1d) |
| Jul 11, 2017 | NTLA | ↓ Sell | 150,000 | $16.24 | $2.4M | Indirect | Jul 11, 2017 (0d) |
| Mar 10, 2017 | NTLA | ↓ Sell | 21,132 | $13.91 | $294K | Indirect | Mar 13, 2017 (3d) |
| Feb 11, 2014 | EGLT | ↑ Buy | 41,667 | $12.00 | $500K | By Atlas Venture Fund | Feb 12, 2014 (1d) |
| Mar 2, 2012 | HZNP | ↑ Buy | 828,443 | $3.62 | $3.0M | Indirect | Mar 6, 2012 (4d) |
| Aug 2, 2011 | HZNP | ↑ Buy | 369,814 | $9.00 | $3.3M | See FN | Aug 4, 2011 (2d) |
| Mar 29, 2010 | ABIO | ↓ Sell | 140,000 | $7.56 | $1.1M | Indirect | Mar 31, 2010 (2d) |
| Feb 1, 2006 | SGXP | ↑ Buy | 416,666 | $6.00 | $2.5M | Indirect | Feb 3, 2006 (2d) |
| Oct 27, 2005 | NXTM | ↑ Buy | 99,923 | $10.00 | $999K | Indirect | Oct 31, 2005 (4d) |
| Sep 7, 2005 | EXEL | ↓ Sell | 275,000 | $7.78 | $2.1M | Partner AVA | Sep 8, 2005 (1d) |
Each row is one filing's trades in one stock, summed. Shares and prices are as filed, before any later stock split.
Other KRRO insiders
Open-market trades in the last 12 months
About Jean Francois Formela's insider trades
Jean Francois Formela is an insider at Korro Bio (KRRO). Since Sep 7, 2005, Jean has reported 7 open-market purchases worth $18.3M and 24 sales worth $247.1M on SEC Form 4. In the last 12 months: 6 sales ($5.1M).
3 sales (0% of the value sold) were made under a Rule 10b5-1 trading plan, which is set up months in advance and runs on a schedule, so they say little about how the insider sees the stock today.
Their filings also include grants and awards (33 filings), conversions (9 filings), other transactions (3 filings), option exercises (2 filings). These aren't open-market trades and aren't counted above.
How to read insider trades
Officers, directors and owners of more than 10% of a company must report trades in its stock on SEC Form 4, usually within two business days. Purchases with their own money are the stronger signal: insiders sell for many reasons (taxes, diversification, a house), but buy for one. See every KRRO insider trade, the latest insider trades across the market, or cluster buys, when several insiders buy the same stock within days.