About this data
What it is
When a company's officers, directors or owners of more than 10% buy or sell its stock, they must report the trade to the SEC on Form 4. This feed shows purchases and sales on the open market; stock grants, option exercises and shares withheld for tax are left out.
Who files it
The insider, usually through the company, within two business days of the trade.
How current
We collect new filings throughout the day on SEC business days.
Worth knowing
Sales are often routine: insiders sell to diversify, to pay taxes, or under a 10b5-1 plan set up months in advance. A purchase with their own money is less common, which is why many investors pay closer attention to it.

All of this comes from public filings.

Open-market trades per day, last 30 days

05001,000Oct 17 · Purchases: 0Oct 17 · Sales: 0Oct 17Oct 18 · Purchases: 0Oct 18 · Sales: 0Oct 19 · Purchases: 29Oct 19 · Sales: 159Oct 20 · Purchases: 45Oct 20 · Sales: 209Oct 21 · Purchases: 38Oct 21 · Sales: 183Oct 21Oct 22 · Purchases: 50Oct 22 · Sales: 130Oct 23 · Purchases: 77Oct 23 · Sales: 126Oct 24 · Purchases: 1Oct 24 · Sales: 0Oct 25 · Purchases: 0Oct 25 · Sales: 0Oct 25Oct 26 · Purchases: 60Oct 26 · Sales: 171Oct 27 · Purchases: 27Oct 27 · Sales: 217Oct 28 · Purchases: 44Oct 28 · Sales: 135Oct 29 · Purchases: 35Oct 29 · Sales: 199Oct 29Oct 30 · Purchases: 68Oct 30 · Sales: 270Oct 31 · Purchases: 3Oct 31 · Sales: 0Nov 1 · Purchases: 2Nov 1 · Sales: 0Nov 2 · Purchases: 79Nov 2 · Sales: 826Nov 2Nov 3 · Purchases: 66Nov 3 · Sales: 337Nov 4 · Purchases: 67Nov 4 · Sales: 535Nov 5 · Purchases: 108Nov 5 · Sales: 458Nov 6 · Purchases: 137Nov 6 · Sales: 390Nov 6Nov 7 · Purchases: 0Nov 7 · Sales: 0Nov 8 · Purchases: 0Nov 8 · Sales: 0Nov 9 · Purchases: 110Nov 9 · Sales: 457Nov 10 · Purchases: 97Nov 10 · Sales: 406Nov 10Nov 11 · Purchases: 98Nov 11 · Sales: 330Nov 12 · Purchases: 54Nov 12 · Sales: 167Nov 13 · Purchases: 23Nov 13 · Sales: 28Nov 14 · Purchases: 0Nov 14 · Sales: 0Nov 14Nov 15 · Purchases: 0Nov 15 · Sales: 0
05001,000Oct 17 · Purchases: 0Oct 17 · Sales: 0Oct 17Oct 18 · Purchases: 0Oct 18 · Sales: 0Oct 19 · Purchases: 29Oct 19 · Sales: 159Oct 20 · Purchases: 45Oct 20 · Sales: 209Oct 21 · Purchases: 38Oct 21 · Sales: 183Oct 21Oct 22 · Purchases: 50Oct 22 · Sales: 130Oct 23 · Purchases: 77Oct 23 · Sales: 126Oct 24 · Purchases: 1Oct 24 · Sales: 0Oct 25 · Purchases: 0Oct 25 · Sales: 0Oct 25Oct 26 · Purchases: 60Oct 26 · Sales: 171Oct 27 · Purchases: 27Oct 27 · Sales: 217Oct 28 · Purchases: 44Oct 28 · Sales: 135Oct 29 · Purchases: 35Oct 29 · Sales: 199Oct 29Oct 30 · Purchases: 68Oct 30 · Sales: 270Oct 31 · Purchases: 3Oct 31 · Sales: 0Nov 1 · Purchases: 2Nov 1 · Sales: 0Nov 2 · Purchases: 79Nov 2 · Sales: 826Nov 2Nov 3 · Purchases: 66Nov 3 · Sales: 337Nov 4 · Purchases: 67Nov 4 · Sales: 535Nov 5 · Purchases: 108Nov 5 · Sales: 458Nov 6 · Purchases: 137Nov 6 · Sales: 390Nov 6Nov 7 · Purchases: 0Nov 7 · Sales: 0Nov 8 · Purchases: 0Nov 8 · Sales: 0Nov 9 · Purchases: 110Nov 9 · Sales: 457Nov 10 · Purchases: 97Nov 10 · Sales: 406Nov 10Nov 11 · Purchases: 98Nov 11 · Sales: 330Nov 12 · Purchases: 54Nov 12 · Sales: 167Nov 13 · Purchases: 23Nov 13 · Sales: 28Nov 14 · Purchases: 0Nov 14 · Sales: 0Nov 14Nov 15 · Purchases: 0Nov 15 · Sales: 0

Purchases Sales

By trade date. Insiders have two business days to file, so the most recent days fill in later.

Latest open-market insider trades

Reset

Showing: ticker KRRO

Latest open-market insider trades
TradedInsiderCompanyTypeSharesPriceValueFiling
Nov 12, 2026Jean Francois Formela
Director
KRRO
Korro Bio, Inc.
Sale6,870$14.30$98.2K SaleForm 4 ↗
Nov 12, 2026Jean Francois Formela
Director
KRRO
Korro Bio, Inc.
Sale33,175$14.30$474.4K SaleForm 4 ↗
Nov 11, 2026Jean Francois Formela
Director
KRRO
Korro Bio, Inc.
Sale617$15.60$9,625 SaleForm 4 ↗
Nov 11, 2026Jean Francois Formela
Director
KRRO
Korro Bio, Inc.
Sale3,944$15.00$59.2K SaleForm 4 ↗
Nov 11, 2026Jean Francois Formela
Director
KRRO
Korro Bio, Inc.
Sale2,984$15.60$46.6K SaleForm 4 ↗
Nov 11, 2026Jean Francois Formela
Director
KRRO
Korro Bio, Inc.
Sale19,042$15.00$285.6K SaleForm 4 ↗
Oct 26, 2026Lynx1 Capital Management LP
10% owner
KRRO
Korro Bio, Inc.
Buy25,124$11.75$295.1K BuyForm 4 ↗
Oct 23, 2026Lynx1 Capital Management LP
10% owner
KRRO
Korro Bio, Inc.
Buy2,510$12.11$30.4K BuyForm 4 ↗
Oct 22, 2026Lynx1 Capital Management LP
10% owner
KRRO
Korro Bio, Inc.
Buy40,000$11.04$441.5K BuyForm 4 ↗
Oct 22, 2026Lynx1 Capital Management LP
10% owner
KRRO
Korro Bio, Inc.
Buy12,175$9.68$117.8K BuyForm 4 ↗
Sep 14, 2026Jean Francois Formela
Director
KRRO
Korro Bio, Inc.
Sale6,602$14.12$93.2K SaleForm 4 ↗
Sep 14, 2026Jean Francois Formela
Director
KRRO
Korro Bio, Inc.
Sale31,888$14.12$450.3K SaleForm 4 ↗
Sep 11, 2026Oliver Dolan
Senior Vice President, Finance
KRRO
Korro Bio, Inc.
Sale5$13.72$68.6 SaleForm 4 ↗
Sep 11, 2026Jean Francois Formela
Director
KRRO
Korro Bio, Inc.
Sale1,750$13.99$24.5K SaleForm 4 ↗
Sep 11, 2026Jean Francois Formela
Director
KRRO
Korro Bio, Inc.
Sale8,450$13.99$118.2K SaleForm 4 ↗
Sep 9, 2026Oliver Dolan
Senior Vice President, Finance
KRRO
Korro Bio, Inc.
Sale6$13.60$81.6 SaleForm 4 ↗
Sep 8, 2026Oliver Dolan
Senior Vice President, Finance
KRRO
Korro Bio, Inc.
Sale7,347$13.51$99.3K SaleForm 4 ↗
Aug 26, 2026Jean Francois Formela
Director
KRRO
Korro Bio, Inc.
Sale51$13.96$712 SaleForm 4 ↗
Aug 26, 2026Jean Francois Formela
Director
KRRO
Korro Bio, Inc.
Sale249$13.96$3,476 SaleForm 4 ↗
Aug 19, 2026Jean Francois Formela
Director
KRRO
Korro Bio, Inc.
Sale4,884$14.00$68.4K SaleForm 4 ↗
Aug 19, 2026Jean Francois Formela
Director
KRRO
Korro Bio, Inc.
Sale23,584$14.00$330.2K SaleForm 4 ↗
Aug 11, 2026Jean Francois Formela
Director
KRRO
Korro Bio, Inc.
Sale368$13.96$5,137 SaleForm 4 ↗
Aug 11, 2026Jean Francois Formela
Director
KRRO
Korro Bio, Inc.
Sale1,775$13.96$24.8K SaleForm 4 ↗
Aug 10, 2026Lynx1 Capital Management LP
10% owner
KRRO
Korro Bio, Inc.
Buy1,462$13.19$19.3K BuyForm 4 ↗
Aug 6, 2026Lynx1 Capital Management LP
10% owner
KRRO
Korro Bio, Inc.
Buy5,222$11.40$59.5K BuyForm 4 ↗
Aug 4, 2026Ram Aiyar
President and CEO, Director
KRRO
Korro Bio, Inc.
Sale5,802$10.84$62.9K SaleForm 4 ↗
Jul 6, 2026Jean Francois Formela
Director
KRRO
Korro Bio, Inc.
Sale8,506$13.96$118.7K SaleForm 4 ↗
Jul 6, 2026Jean Francois Formela
Director
KRRO
Korro Bio, Inc.
Sale817$13.96$11.4K SaleForm 4 ↗
Jul 2, 2026Jean Francois Formela
Director
KRRO
Korro Bio, Inc.
Sale14,745$14.03$206.9K SaleForm 4 ↗
Jul 2, 2026Jean Francois Formela
Director
KRRO
Korro Bio, Inc.
Sale85,955$14.03$1.2M SaleForm 4 ↗
Jun 24, 2026Jean Francois Formela
Director
KRRO
Korro Bio, Inc.
Sale114$14.98$1,708 SaleForm 4 ↗
Jun 24, 2026Jean Francois Formela
Director
KRRO
Korro Bio, Inc.
Sale6,979$14.60$101.9K SaleForm 4 ↗
Jun 24, 2026Jean Francois Formela
Director
KRRO
Korro Bio, Inc.
Sale666$14.98$9,977 SaleForm 4 ↗
Jun 24, 2026Jean Francois Formela
Director
KRRO
Korro Bio, Inc.
Sale40,679$14.60$593.9K SaleForm 4 ↗
Jun 23, 2026Jean Francois Formela
Director
KRRO
Korro Bio, Inc.
Sale17,426$14.25$248.3K SaleForm 4 ↗
Jun 23, 2026Jean Francois Formela
Director
KRRO
Korro Bio, Inc.
Sale101,579$14.25$1.4M SaleForm 4 ↗
Jun 22, 2026Jean Francois Formela
Director
KRRO
Korro Bio, Inc.
Sale580$13.95$8,091 SaleForm 4 ↗
Jun 22, 2026Jean Francois Formela
Director
KRRO
Korro Bio, Inc.
Sale3,382$13.95$47.2K SaleForm 4 ↗
Jun 16, 2026Todd Chappell
Chief Operating Officer
KRRO
Korro Bio, Inc.
Sale3,168$10.83$34.3K SaleForm 4 ↗
Jun 16, 2026Loic A. Vincent
Chief Scientific Officer
KRRO
Korro Bio, Inc.
Sale3,418$10.83$37.0K SaleForm 4 ↗
Jun 16, 2026Jeffrey Cerio
General Counsel
KRRO
Korro Bio, Inc.
Sale6,609$10.83$71.6K SaleForm 4 ↗
Jun 16, 2026Oliver Dolan
Senior Vice President, Finance
KRRO
Korro Bio, Inc.
Sale3,383$10.83$36.6K SaleForm 4 ↗
May 29, 2026Ram Aiyar
President and CEO, Director
KRRO
Korro Bio, Inc.
Sale15,152$12.98$196.7K SaleForm 4 ↗
May 28, 2026Jean Francois Formela
Director
KRRO
Korro Bio, Inc.
Sale419$13.95$5,845 SaleForm 4 ↗
May 28, 2026Jean Francois Formela
Director
KRRO
Korro Bio, Inc.
Sale2,441$13.95$34.1K SaleForm 4 ↗
Mar 31, 2026Weston Nichols
10% owner
KRRO
Korro Bio, Inc.
Buy520$10.60$5,512 BuyForm 4 ↗
Mar 10, 2026Rick Yang
10% owner
KRRO
Korro Bio, Inc.
Buy207,100$11.11$2.3M BuyForm 4 ↗
Mar 10, 2026Scott D. Sandell
10% owner
KRRO
Korro Bio, Inc.
Buy207,100$11.11$2.3M BuyForm 4 ↗
Mar 10, 2026New Enterprise Associates 17, L.P.
10% owner
KRRO
Korro Bio, Inc.
Buy207,100$11.11$2.3M BuyForm 4 ↗
Mar 10, 2026Carmen Chang
10% owner
KRRO
Korro Bio, Inc.
Buy207,100$11.11$2.3M BuyForm 4 ↗

The newest 50 items, most recent first. Every row links to its original filing. Updated Nov 15, 2026, 5:54 PM EST.

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