United States Biotechnology & Medical Research

Korro Bio Inc (KRRO)

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Over the past 90 days, Korro Bio Inc. has seen significant insider selling, with a net value of approximately $410,522. Transactions were dominated by planned and proposed sales from Jean-Francois Formela and associated Atlas Venture funds. These divestments occurred amid a 14% decline in stock price, following the company's May 2026 earnings report.
Ticker: KRRO Exchange: NAS
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• Purchase • Sale • Planned purchase • Planned sale Net purchase Net sale Buy signal Sell signal Earnings
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Trades
FORMELA JEAN FRANCOIS
2 sales — total 200,000 USD
Planned sale 6 Jul 2026
Value US$66,009.72 | Price 290.67 | Shares 77,335
Planned sale 6 Jul 2026
Value US$1,740,430.23 | Price 99.13 | Shares 58,277
Proposed sale 6 Jul 2026
Value US$4,533,613.20 | Price 121.78 | Shares 56,650
Proposed sale 6 Jul 2026
Value US$100,000.00 | Price 14.00 | Shares 1,000
Planned sale 2 Jul 2026
Value US$100,000.00 | Price 14.03 | Shares 1,000
Planned sale 2 Jul 2026
Value US$100,000.00 | Price 14.03 | Shares 1,000
Proposed sale 2 Jul 2026
Value US$201,269.25 | Price 13.65 | Shares 14,745
Proposed sale 2 Jul 2026
Value US$1,173,285.75 | Price 13.65 | Shares 85,955
Planned sale 24 Jun 2026
Value US$1,707.72 | Price 14.98 | Shares 114
Planned sale 24 Jun 2026
Value US$101,893.40 | Price 14.60 | Shares 6,979
Planned sale 24 Jun 2026
Value US$9,976.68 | Price 14.98 | Shares 666
Planned sale 24 Jun 2026
Value US$593,913.40 | Price 14.60 | Shares 40,679
Proposed sale 24 Jun 2026
Value US$566,839.95 | Price 13.71 | Shares 41,345
Proposed sale 24 Jun 2026
Value US$97,245.03 | Price 13.71 | Shares 7,093
Planned sale 23 Jun 2026
Value US$248,320.50 | Price 14.25 | Shares 17,426
Planned sale 23 Jun 2026
Value US$1,447,500.75 | Price 14.25 | Shares 101,579
Proposed sale 23 Jun 2026
Value US$242,221.40 | Price 13.90 | Shares 17,426
Proposed sale 23 Jun 2026
Value US$1,411,948.10 | Price 13.90 | Shares 101,579
Planned sale 22 Jun 2026
Value US$8,091.00 | Price 13.95 | Shares 580
Planned sale 22 Jun 2026
Value US$47,178.90 | Price 13.95 | Shares 3,382
Proposed sale 22 Jun 2026
Value US$47,556.39 | Price 12.99 | Shares 3,661
Proposed sale 22 Jun 2026
Value US$47,556.39 | Price 12.99 | Shares 3,661
Proposed sale 22 Jun 2026
Value US$277,193.61 | Price 12.99 | Shares 21,339
Sale 16 Jun 2026
Value US$34,309.44 | Price 10.83 | Shares 3,168
Sale 16 Jun 2026
Value US$34,309.44 | Price 10.83 | Shares 3,168
Proposed sale 16 Jun 2026
Value US$34,309.76 | Price 10.83 | Shares 3,168
Sale 16 Jun 2026
Value US$37,016.94 | Price 10.83 | Shares 3,418
Proposed sale 16 Jun 2026
Value US$37,017.28 | Price 10.83 | Shares 3,418
Sale 16 Jun 2026
Value US$71,575.47 | Price 10.83 | Shares 6,609
Proposed sale 16 Jun 2026
Value US$71,576.13 | Price 10.83 | Shares 6,609
Sale 16 Jun 2026
Value US$36,637.89 | Price 10.83 | Shares 3,383
Proposed sale 16 Jun 2026
Value US$36,638.23 | Price 10.83 | Shares 3,383
Sale 29 May 2026
Value US$196,672.96 | Price 12.98 | Shares 15,152
Proposed sale 29 May 2026
Value US$196,675.99 | Price 12.98 | Shares 15,152
Planned sale 28 May 2026
Value US$5,845.05 | Price 13.95 | Shares 419
Planned sale 28 May 2026
Value US$34,051.95 | Price 13.95 | Shares 2,441
Buy 31 Mar 2026
Value US$5,512.00 | Price 10.60 | Shares 520
Buy 10 Mar 2026
Value US$2,300,881.00 | Price 11.11 | Shares 207,100
Buy 10 Mar 2026
Value US$2,300,881.00 | Price 11.11 | Shares 207,100
Buy 10 Mar 2026
Value US$2,300,881.00 | Price 11.11 | Shares 207,100
Buy 10 Mar 2026
Value US$2,300,881.00 | Price 11.11 | Shares 207,100
Buy 10 Mar 2026
Value US$2,300,881.00 | Price 11.11 | Shares 207,100
Buy 10 Mar 2026
Value US$2,300,881.00 | Price 11.11 | Shares 207,100
Buy 10 Mar 2026
Value US$2,300,881.00 | Price 11.11 | Shares 207,100
Buy 10 Mar 2026
Value US$2,300,881.00 | Price 11.11 | Shares 207,100
Buy 10 Mar 2026
Value US$2,300,881.00 | Price 11.11 | Shares 207,100
Proposed sale 11 Nov 2024
Value US$56,000.00 | Price 70.00 | Shares 800
Planned sale 11 Nov 2024
Value US$56,000.00 | Price 70.00 | Shares 800
Planned sale 17 Oct 2024
Value US$2,072.25 | Price 82.89 | Shares 25
Planned sale 17 Oct 2024
Value US$25,829.16 | Price 81.48 | Shares 317
Planned sale 17 Oct 2024
Value US$399,373.89 | Price 80.50 | Shares 4,961
Planned sale 17 Oct 2024
Value US$144,820.85 | Price 79.79 | Shares 1,815
Planned sale 17 Oct 2024
Value US$35,913.66 | Price 78.59 | Shares 457
Planned sale 17 Oct 2024
Value US$20,164.25 | Price 77.55 | Shares 260
Planned sale 17 Oct 2024
Value US$1,771.00 | Price 77.00 | Shares 23
Planned sale 17 Oct 2024
Value US$4,256.00 | Price 76.00 | Shares 56
Planned sale 17 Oct 2024
Value US$8,574.50 | Price 74.56 | Shares 115
Planned sale 17 Oct 2024
Value US$12,088.70 | Price 73.71 | Shares 164
Planned sale 17 Oct 2024
Value US$144,662.71 | Price 71.51 | Shares 2,023
Proposed sale 17 Oct 2024
Value US$799,526.85 | Price 78.26 | Shares 10,216
Proposed sale 16 Oct 2024
Value US$1,225,450.12 | Price 88.67 | Shares 13,821
Proposed sale 30 Aug 2024
Value US$507,325.52 | Price 49.24 | Shares 10,303
Buy 22 Apr 2024
Value US$999,992.00 | Price 56.00 | Shares 17,857
Buy 22 Apr 2024
Value US$999,992.00 | Price 56.00 | Shares 17,857
Buy 22 Apr 2024
Value US$999,992.00 | Price 56.00 | Shares 17,857
Buy 22 Apr 2024
Value US$999,992.00 | Price 56.00 | Shares 17,857
Buy 22 Apr 2024
Value US$999,992.00 | Price 56.00 | Shares 17,857
Buy 22 Apr 2024
Value US$999,992.00 | Price 56.00 | Shares 17,857
Buy 22 Apr 2024
Value US$999,992.00 | Price 56.00 | Shares 17,857
Buy 22 Apr 2024
Value US$999,992.00 | Price 56.00 | Shares 17,857
Buy 22 Apr 2024
Value US$999,992.00 | Price 56.00 | Shares 17,857
Buy 22 Apr 2024
Value US$999,992.00 | Price 56.00 | Shares 17,857
Sale 22 Nov 2023
Value US$7,841.54 | Price 38.82 | Shares 202
Sale 22 Nov 2023
Value US$23,322.42 | Price 37.98 | Shares 614
Sale 22 Nov 2023
Value US$8,449.99 | Price 36.74 | Shares 230
Abbreviations B: Buy, S: Sell, PP: Planned purchase, PlS: Planned sale, PrS: Proposed sale, O: Option / Other
Notification date Transaction date B/S Transaction type Insider and/or position Nb. shares
Price
Value 		Number of shares Price Value Details
2026-07-07 2026-07-06 PlS Planned sale
1.5
FORMELA JEAN FRANCOIS
Non-Executive Director
77,335 -27.0%
290.67
US$66,010 		77,335 -27.0% 290.67 US$66,010
2026-07-07 2026-07-06 PlS Planned sale
1.5
FORMELA JEAN FRANCOIS
Non-Executive Director
58,277 -37.7%
99.13
US$1,740,430 		58,277 -37.7% 99.13 US$1,740,430
2026-07-06 2026-07-06 PrS Proposed sale
3.4
Atlas Venture Opportunity Fund II, L.P.

Shareholder
56,650
121.78
US$4,533,613 		56,650 121.78 US$4,533,613
2026-07-06 2026-07-06 PrS Proposed sale
2.0
Atlas Venture Fund XI, L.P.

Shareholder
1,000
14.00
US$100,000 		1,000 14.00 US$100,000
2026-07-07 2026-07-02 PlS Planned sale
1.5
FORMELA JEAN FRANCOIS
Non-Executive Director
1,000 -8.7%
14.03
US$100,000 		1,000 -8.7% 14.03 US$100,000
2026-07-07 2026-07-02 PlS Planned sale
1.5
FORMELA JEAN FRANCOIS
Non-Executive Director
1,000 -10.8%
14.03
US$100,000 		1,000 -10.8% 14.03 US$100,000
2026-07-02 2026-07-02 PrS Proposed sale
3.4
Atlas Venture Opportunity Fund II, L.P.

Shareholder
14,745
13.65
US$201,269 		14,745 13.65 US$201,269
2026-07-02 2026-07-02 PrS Proposed sale
2.0
Atlas Venture Fund XI, L.P.

Shareholder
85,955
13.65
US$1,173,286 		85,955 13.65 US$1,173,286
2026-06-24 2026-06-24 PlS Planned sale
1.5
FORMELA JEAN FRANCOIS
Non-Executive Director
114 -0.1%
14.98
US$1,708 		114 -0.1% 14.98 US$1,708
2026-06-24 2026-06-24 PlS Planned sale
1.5
FORMELA JEAN FRANCOIS
Non-Executive Director
6,979 -4.0%
14.60
US$101,893 		6,979 -4.0% 14.60 US$101,893
2026-06-24 2026-06-24 PlS Planned sale
1.5
FORMELA JEAN FRANCOIS
Non-Executive Director
666 -0.1%
14.98
US$9,977 		666 -0.1% 14.98 US$9,977
2026-06-24 2026-06-24 PlS Planned sale
1.5
FORMELA JEAN FRANCOIS
Non-Executive Director
40,679 -4.9%
14.60
US$593,913 		40,679 -4.9% 14.60 US$593,913
2026-06-24 2026-06-24 PrS Proposed sale
2.0
Atlas Venture Fund XI, L.P.

Shareholder
41,345
13.71
US$566,840 		41,345 13.71 US$566,840
2026-06-24 2026-06-24 PrS Proposed sale
3.4
Atlas Venture Opportunity Fund II, L.P.

Shareholder
7,093
13.71
US$97,245 		7,093 13.71 US$97,245
2026-06-24 2026-06-23 PlS Planned sale
1.5
FORMELA JEAN FRANCOIS
Non-Executive Director
17,426 -9.0%
14.25
US$248,320 		17,426 -9.0% 14.25 US$248,320
2026-06-24 2026-06-23 PlS Planned sale
1.5
FORMELA JEAN FRANCOIS
Non-Executive Director
101,579 -10.8%
14.25
US$1,447,501 		101,579 -10.8% 14.25 US$1,447,501
2026-06-23 2026-06-23 PrS Proposed sale
3.4
Atlas Venture Opportunity Fund II, L.P.

Shareholder
17,426
13.90
US$242,221 		17,426 13.90 US$242,221
2026-06-23 2026-06-23 PrS Proposed sale
2.0
Atlas Venture Fund XI, L.P.

Shareholder
101,579
13.90
US$1,411,948 		101,579 13.90 US$1,411,948
2026-06-24 2026-06-22 PlS Planned sale
1.5
FORMELA JEAN FRANCOIS
Non-Executive Director
580 -0.3%
13.95
US$8,091 		580 -0.3% 13.95 US$8,091
2026-06-24 2026-06-22 PlS Planned sale
1.5
FORMELA JEAN FRANCOIS
Non-Executive Director
3,382 -0.4%
13.95
US$47,179 		3,382 -0.4% 13.95 US$47,179
2026-06-22 2026-06-22 PrS Proposed sale
3.4
Atlas Venture Opportunity Fund II, L.P.

Shareholder
3,661
12.99
US$47,556 		3,661 12.99 US$47,556
2026-06-22 2026-06-22 PrS Proposed sale
3.4
Atlas Venture Opportunity Fund II, L.P.

Shareholder
3,661
12.99
US$47,556 		3,661 12.99 US$47,556
2026-06-22 2026-06-22 PrS Proposed sale
2.0
Atlas Venture Fund XI, L.P.

Shareholder
21,339
12.99
US$277,194 		21,339 12.99 US$277,194
2026-06-17 2026-06-16 S Sale
Chappell Todd

Chief Operating Officer

Officer
3,168 -15.7%
10.83
US$34,309 		3,168 -15.7% 10.83 US$34,309
2026-06-17 2026-06-16 S Sale
Chappell Todd

Chief Operating Officer

Officer
3,168 -15.7%
10.83
US$34,309 		3,168 -15.7% 10.83 US$34,309
2026-06-17 2026-06-16 S Sale
Vincent Loic A

Chief Scientific Officer

Officer
3,418 -15.7%
10.83
US$37,017 		3,418 -15.7% 10.83 US$37,017
2026-06-17 2026-06-16 S Sale
Cerio Jeffrey

General Counsel

Officer
6,609 -15.8%
10.83
US$71,575 		6,609 -15.8% 10.83 US$71,575
2026-06-17 2026-06-16 S Sale
Dolan Oliver

Senior Vice President, Finance

Officer
3,383 -15.7%
10.83
US$36,638 		3,383 -15.7% 10.83 US$36,638
2026-06-16 2026-06-16 PrS Proposed sale
Vincent Loic A

Officer

Officer
3,418
10.83
US$37,017 		3,418 10.83 US$37,017
2026-06-16 2026-06-16 PrS Proposed sale
Dolan Oliver

Officer

Officer
3,383
10.83
US$36,638 		3,383 10.83 US$36,638
2026-06-16 2026-06-16 PrS Proposed sale
Cerio Jeffrey

Officer

Officer
6,609
10.83
US$71,576 		6,609 10.83 US$71,576
2026-06-16 2026-06-16 PrS Proposed sale
Chappell Todd

Officer

Officer
3,168
10.83
US$34,310 		3,168 10.83 US$34,310
2026-06-02 2026-05-29 S Sale
Aiyar Ram

President and CEO

Executive Director
15,152 -16.8%
12.98
US$196,673 		15,152 -16.8% 12.98 US$196,673
2026-05-29 2026-05-29 PrS Proposed sale
Aiyar Ram

Officer

Officer
15,152
12.98
US$196,676 		15,152 12.98 US$196,676
2026-06-01 2026-05-28 PlS Planned sale
1.5
FORMELA JEAN FRANCOIS
Non-Executive Director
419 -0.2%
13.95
US$5,845 		419 -0.2% 13.95 US$5,845
2026-06-01 2026-05-28 PlS Planned sale
1.5
FORMELA JEAN FRANCOIS
Non-Executive Director
2,441 -0.3%
13.95
US$34,052 		2,441 -0.3% 13.95 US$34,052
2026-04-02 2026-03-31 B Purchase
4.1
Lynx1 Capital Management LP
Large shareholder
520 +0.0%
10.60
US$5,512 		520 +0.0% 10.60 US$5,512
2026-03-12 2026-03-10 B Purchase
2.9
Makhzoumi Mohamad
Large shareholder
207,100 +19.0%
11.11
US$2,300,881 		207,100 +19.0% 11.11 US$2,300,881
2026-03-12 2026-03-10 B Purchase
3.3
Mathers Edward T
Large shareholder
207,100 +19.0%
11.11
US$2,300,881 		207,100 +19.0% 11.11 US$2,300,881
2026-03-12 2026-03-10 B Purchase
3.3
Yang Rick
Large shareholder
207,100 +19.0%
11.11
US$2,300,881 		207,100 +19.0% 11.11 US$2,300,881
2026-03-12 2026-03-10 B Purchase
2.7
Florence Anthony A. Jr.
Large shareholder
207,100 +19.0%
11.11
US$2,300,881 		207,100 +19.0% 11.11 US$2,300,881
2026-03-12 2026-03-10 B Purchase
2.5
New Enterprise Associates 17, L.P.
Large shareholder
207,100 +19.0%
11.11
US$2,300,881 		207,100 +19.0% 11.11 US$2,300,881
2026-03-12 2026-03-10 B Purchase
3.6
Chang Carmen
Large shareholder
207,100 +19.0%
11.11
US$2,300,881 		207,100 +19.0% 11.11 US$2,300,881
2026-03-12 2026-03-10 B Purchase
2.5
BASKETT FOREST
Large shareholder
207,100 +19.0%
11.11
US$2,300,881 		207,100 +19.0% 11.11 US$2,300,881
2026-03-12 2026-03-10 B Purchase
3.9
Walker Paul Edward
Large shareholder
207,100 +19.0%
11.11
US$2,300,881 		207,100 +19.0% 11.11 US$2,300,881
2026-03-12 2026-03-10 B Purchase
2.4
SANDELL SCOTT D
Large shareholder
207,100 +19.0%
11.11
US$2,300,881 		207,100 +19.0% 11.11 US$2,300,881
2024-11-12 2024-11-11 PrS Proposed sale
Agarwal Vineet

Officer

Officer
800
70.00
US$56,000 		800 70.00 US$56,000
2024-11-12 2024-11-11 PlS Planned sale
Agarwal Vineet

Chief Financial Officer

Officer
800 -100.0%
70.00
US$56,000 		800 -100.0% 70.00 US$56,000
2024-10-18 2024-10-17 PlS Planned sale
Agarwal Vineet

Chief Financial Officer

Officer
25 -100.0%
82.89
US$2,072 		25 -100.0% 82.89 US$2,072
2024-10-18 2024-10-17 PlS Planned sale
Agarwal Vineet

Chief Financial Officer

Officer
317 -92.7%
81.48
US$25,829 		317 -92.7% 81.48 US$25,829
2024-10-18 2024-10-17 PlS Planned sale
Agarwal Vineet

Chief Financial Officer

Officer
4,961 -93.6%
80.50
US$399,374 		4,961 -93.6% 80.50 US$399,374
2024-10-18 2024-10-17 PlS Planned sale
Agarwal Vineet

Chief Financial Officer

Officer
1,815 -25.5%
79.79
US$144,821 		1,815 -25.5% 79.79 US$144,821
2024-10-18 2024-10-17 PlS Planned sale
Agarwal Vineet

Chief Financial Officer

Officer
457 -6.0%
78.59
US$35,914 		457 -6.0% 78.59 US$35,914
2024-10-18 2024-10-17 PlS Planned sale
Agarwal Vineet

Chief Financial Officer

Officer
260 -3.3%
77.55
US$20,164 		260 -3.3% 77.55 US$20,164
2024-10-18 2024-10-17 PlS Planned sale
Agarwal Vineet

Chief Financial Officer

Officer
23 -0.3%
77.00
US$1,771 		23 -0.3% 77.00 US$1,771
2024-10-18 2024-10-17 PlS Planned sale
Agarwal Vineet

Chief Financial Officer

Officer
56 -0.7%
76.00
US$4,256 		56 -0.7% 76.00 US$4,256
2024-10-18 2024-10-17 PlS Planned sale
Agarwal Vineet

Chief Financial Officer

Officer
115 -1.4%
74.56
US$8,575 		115 -1.4% 74.56 US$8,575
2024-10-18 2024-10-17 PlS Planned sale
Agarwal Vineet

Chief Financial Officer

Officer
164 -2.0%
73.71
US$12,089 		164 -2.0% 73.71 US$12,089
2024-10-18 2024-10-17 PlS Planned sale
Agarwal Vineet

Chief Financial Officer

Officer
2,023 -19.8%
71.51
US$144,663 		2,023 -19.8% 71.51 US$144,663
2024-10-17 2024-10-17 PrS Proposed sale
Agarwal Vineet

Officer

Officer
10,216
78.26
US$799,527 		10,216 78.26 US$799,527
2024-10-16 2024-10-16 PrS Proposed sale
Colletti Steve

Former Officer

Officer
13,821
88.67
US$1,225,450 		13,821 88.67 US$1,225,450
2024-08-30 2024-08-30 PrS Proposed sale
Colletti Steve

Former Officer

Officer
10,303
49.24
US$507,326 		10,303 49.24 US$507,326
2024-04-24 2024-04-22 B Purchase
2.7
Florence Anthony A. Jr.
Large shareholder
17,857 +1.7%
56.00
US$999,992 		17,857 +1.7% 56.00 US$999,992
2024-04-24 2024-04-22 B Purchase
2.5
BASKETT FOREST
Large shareholder
17,857 +1.7%
56.00
US$999,992 		17,857 +1.7% 56.00 US$999,992
2024-04-24 2024-04-22 B Purchase
3.3
Yang Rick
Large shareholder
17,857 +1.7%
56.00
US$999,992 		17,857 +1.7% 56.00 US$999,992
2024-04-24 2024-04-22 B Purchase
2.9
Makhzoumi Mohamad
Large shareholder
17,857 +1.7%
56.00
US$999,992 		17,857 +1.7% 56.00 US$999,992
2024-04-24 2024-04-22 B Purchase
3.3
Mathers Edward T
Large shareholder
17,857 +1.7%
56.00
US$999,992 		17,857 +1.7% 56.00 US$999,992
2024-04-24 2024-04-22 B Purchase
3.6
Chang Carmen
Large shareholder
17,857 +1.7%
56.00
US$999,992 		17,857 +1.7% 56.00 US$999,992
2024-04-24 2024-04-22 B Purchase
3.9
Walker Paul Edward
Large shareholder
17,857 +1.7%
56.00
US$999,992 		17,857 +1.7% 56.00 US$999,992
2024-04-24 2024-04-22 B Purchase
2.5
New Enterprise Associates 17, L.P.
Large shareholder
17,857 +1.7%
56.00
US$999,992 		17,857 +1.7% 56.00 US$999,992
2024-04-24 2024-04-22 B Purchase
2.4
SANDELL SCOTT D
Large shareholder
17,857 +1.7%
56.00
US$999,992 		17,857 +1.7% 56.00 US$999,992
2024-04-23 2024-04-22 B Purchase
3.4
Atlas Venture Opportunity Fund II, L.P.
Large shareholder
17,857 +10.1%
56.00
US$999,992 		17,857 +10.1% 56.00 US$999,992
2023-11-27 2023-11-22 S Sale
0.9
Lucchino David L.
Non-Executive Director
202 -0.9%
38.82
US$7,842 		202 -0.9% 38.82 US$7,842
2023-11-27 2023-11-22 S Sale
0.9
Lucchino David L.
Non-Executive Director
614 -2.7%
37.98
US$23,322 		614 -2.7% 37.98 US$23,322
2023-11-27 2023-11-22 S Sale
0.9
Lucchino David L.
Non-Executive Director
230 -1.0%
36.74
US$8,450 		230 -1.0% 36.74 US$8,450
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