Korro Bio KRRO Insider Ownership

NASDAQ KRRO

$14.41 -1.32 (-8.39%)

At close: Nov 11, 2026 · 4:00 PM EST

Insider Holdings by Owner

15.14Mn Shares

Capital Management Lp Lynx11.62Mn10.7%

Scott D Sandell1.30Mn8.6%

Forest Baskett1.30Mn8.6%

Edward T Mathers1.30Mn8.6%

Rick Yang1.30Mn8.6%

Other insiders (21)8.32Mn55.0%

Insider Ownership Statistics

as of 30 Sep, 2026

Insider Ownership

18.02%

▼-0.093% pp QoQ

Shares Held by Insiders

3.18Mn

filed for Sep 2026

▼-0.51% QoQ

Shares Outstanding

17.62Mn

17,618,441 shares

Direct Holdings

178.04K

Indirect: 3.00Mn

Net Open-Market Trades

-196.10K

net sold · -$2.75Mn in Sep 2026

Insiders Holding Shares

with Form 4 holdings on file

Shares Owned by Insiders

Shares held % of outstanding

Latest —

Average ownership —

Peak ownership —

Open-Market Insider Trades

Bought Sold

Latest quarter —

Net over range —

Net-buying quarters —

Insider Ownership Summary

Updated Oct 27, 2026

Across the past 12 months, open-market trades by Korro Bio insiders totaled $3.27 million in purchases (294.11K shares) and $5.7 million in sales (408.78K shares).

By number of insiders, Korro Bio saw 2 insiders buy and 6 insiders sell on the open market over the past 12 months.
Among Korro Bio insiders, Anthony A. Florence Jr. (10% owner) led open-market buying over the past 12 months with $2.3 million of purchases (207.1K shares); the latest was on March 10, 2026.
Conversely, Jean Francois Formela (Director) was KRRO's largest open-market seller in the past 12 months, with $5.16 million of sales (363.89K shares); the latest was on September 14, 2026.
Korro Bio's latest insider trade on the open market was a purchase of 25.12K shares for $295,091 by Lynx1 Capital Management LP (10% owner) on October 26, 2026.
Outside the open market, Korro Bio insiders received 421.83K shares in stock awards over the past 12 months.
Per Business Quant, KRRO insiders together hold 3.25Mn shares based on their latest Form 4 filings, up 1.99% from 3.19Mn shares at the end of Q2 2026.
Direct holdings account for 178.04K shares (5.47%) of KRRO's insider total, and indirect holdings through trusts, partnerships and family members for 3.08Mn shares (94.53%).
KRRO's insider total is spread across 10 insiders who have filed a Form 4 in the past two years.
KRRO's three largest insider shareholders, per their latest Form 4 filings, are Lynx1 Capital Management LP (10% owner, 1.62Mn shares), Scott D. Sandell (10% owner, 1.3Mn shares) and Jean Francois Formela (Director, 132.65K shares).
The largest insider, Lynx1 Capital Management LP, holds 49.92% of KRRO's insider total.
Institutional investors held 79.58% of Korro Bio stock at the end of Q2 2026, while the latest Form 4 filings of its insiders account for about 18.47%; other investors, including the public, hold roughly 1.95%.
In the last 12 months, 48 Form 4 filings with transactions in KRRO stock came from 21 insiders.
The insider data for KRRO reflects Form 4 filings through October 26, 2026.

Form 4 Holdings

Insiders Holding KRRO

Insiders 26

Shares held 15.14Mn

Of outstanding 85.92%

#	Insider	Position	Direct	Indirect	Total	Share of Insiders	Last Filed
1	Capital Management Lp Lynx1	TenPercentOwner	0	1,624,789	1,624,789	10.7%	26 Oct, 2026
2	Scott D Sandell	TenPercentOwner	0	1,297,893	1,297,893	8.6%	12 Mar, 2026
3	Forest Baskett	TenPercentOwner	0	1,297,893	1,297,893	8.6%	12 Mar, 2026
4	Edward T Mathers	TenPercentOwner	0	1,297,893	1,297,893	8.6%	12 Mar, 2026
5	Rick Yang	TenPercentOwner	0	1,297,893	1,297,893	8.6%	12 Mar, 2026
6	Ali Behbahani	Director, TenPercentOwner	0	1,297,893	1,297,893	8.6%	12 Mar, 2026
7	Mohamad Makhzoumi	TenPercentOwner	0	1,297,893	1,297,893	8.6%	12 Mar, 2026
8	Carmen Chang	TenPercentOwner	0	1,297,893	1,297,893	8.6%	12 Mar, 2026
9	Enterprise Associates 17, L.P. New	TenPercentOwner	1,297,893	0	1,297,893	8.6%	12 Mar, 2026
10	Paul Edward Walker	TenPercentOwner	0	1,297,893	1,297,893	8.6%	12 Mar, 2026
11	Anthony A. Jr. Florence	TenPercentOwner	0	1,297,893	1,297,893	8.6%	12 Mar, 2026
12	Venture Opportunity Fund Ii, L.P. Atlas	TenPercentOwner	195,074	0	195,074	1.3%	23 Apr, 2024
13	Jean Francois Formela	Director	0	132,650	132,650	0.9%	15 Sep, 2026
14	Ram Aiyar	President And Ceo	69,046	0	69,046	0.5%	05 Aug, 2026
15	Jeffrey Cerio	General Counsel	41,793	0	41,793	0.3%	17 Jul, 2026
16	Loic A Vincent	Chief Scientific Officer	25,797	0	25,797	0.2%	17 Jul, 2026
17	Todd Chappell	Chief Operating Officer	24,464	0	24,464	0.2%	17 Jul, 2026
18	David L. Lucchino	President And Ceo	22,150	0	22,150	0.1%	27 Nov, 2023
19	Oliver Dolan	Senior Vice President, Finance	16,241	0	16,241	0.1%	14 Sep, 2026
20	Christopher R. Loose	Chief Scientific Officer	3,673	0	3,673	0.0%	31 Jul, 2023
21	Richard J. Mitrano	Vp Finance Operations	969	0	969	0.0%	22 Aug, 2023
22	Quentin Mccubbin	Chief Manufacturing Officer	767	0	767	0.0%	07 Jul, 2022
23	Nessan Bermingham	Director	702	0	702	0.0%	07 Nov, 2023
24	Carl Lebel	Chief Development Officer	527	0	527	0.0%	07 Jul, 2022
25	Wendy S Arnold	Chief People Officer	424	0	424	0.0%	07 Jul, 2022
26	Peter P. Pfreundschuh	Chief Financial Officer	179	0	179	0.0%	23 Feb, 2022

Each row is that insider’s most recently reported position, from Form 4 filings over the last 60 months — which is why this total does not tie to the quarterly series above, where a quarter counts only the insiders who filed in it. Shares held through a fund or institutional portfolio are counted on the institutional ownership page instead.

Form 4 Filings

671 Insider Transactions

Source SEC Form 4

Latest quarter Sep 2026

Date	Insider	Position	Transaction	Shares	Price	Value	Shares Held After	Ownership
22 Oct, 2026	Capital Management Lp Lynx1	TenPercentOwner	Acquired P	12,175	$9.68	$117.81K	1,557,155	Indirect
22 Oct, 2026	Capital Management Lp Lynx1	TenPercentOwner	Acquired P	40,000	$11.04	$441.46K	1,597,155	Indirect
23 Oct, 2026	Capital Management Lp Lynx1	TenPercentOwner	Acquired P	2,510	$12.11	$30.39K	1,599,665	Indirect
26 Oct, 2026	Capital Management Lp Lynx1	TenPercentOwner	Acquired P	25,124	$11.75	$295.09K	1,624,789	Indirect
11 Sep, 2026	Jean Francois Formela	Director	Disposed S	8,450	$13.99	$118.22K	672,498	Indirect
11 Sep, 2026	Jean Francois Formela	Director	Disposed S	1,750	$13.99	$24.48K	139,252	Indirect
14 Sep, 2026	Jean Francois Formela	Director	Disposed S	31,888	$14.12	$450.26K	640,610	Indirect
14 Sep, 2026	Jean Francois Formela	Director	Disposed S	6,602	$14.12	$93.22K	132,650	Indirect
11 Sep, 2026	Oliver Dolan	Senior Vice President, Finance	Disposed S	5	$13.72	$69	16,241	Direct
08 Sep, 2026	Oliver Dolan	Senior Vice President, Finance	Disposed S	7,347	$13.51	$99.29K	16,252	Direct
09 Sep, 2026	Oliver Dolan	Senior Vice President, Finance	Disposed S	6	$13.60	$82	16,246	Direct
26 Aug, 2026	Jean Francois Formela	Director	Disposed S	249	$13.96	$3.48K	680,948	Indirect
26 Aug, 2026	Jean Francois Formela	Director	Disposed S	51	$13.96	$712	141,002	Indirect
19 Aug, 2026	Jean Francois Formela	Director	Disposed S	23,584	$14.00	$330.18K	681,197	Indirect
19 Aug, 2026	Jean Francois Formela	Director	Disposed S	4,884	$14.00	$68.38K	141,053	Indirect
11 Aug, 2026	Jean Francois Formela	Director	Disposed S	1,775	$13.96	$24.78K	704,781	Indirect
06 Aug, 2026	Capital Management Lp Lynx1	TenPercentOwner	Acquired P	5,222	$11.40	$59.53K	1,543,518	Indirect
11 Aug, 2026	Jean Francois Formela	Director	Disposed S	368	$13.96	$5.14K	145,937	Indirect
10 Aug, 2026	Capital Management Lp Lynx1	TenPercentOwner	Acquired P	1,462	$13.19	$19.28K	1,544,980	Indirect
04 Aug, 2026	Ram Aiyar	President And Ceo	Disposed S	5,802	$10.84	$62.92K	69,046	Direct

Showing 1 to 20 of 671 transactions