SEC ownership of Korro Bio, Inc.
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001703647.
- CIK
- 0001703647
- Symbol
- KRRO on Nasdaq
- Location
- Cambridge, MA
- Parsed ownership evidence
- 13D/G, 3/4/5, and 13F
- Lead holder
- Lynx1 Capital Management LP
- 13D/G signal
- Lynx1 Capital Management LP
- Latest evidence date
- 31 Mar 2026
Ownership snapshot
Top shareholders of Korro Bio, Inc. (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Lead holder
Lynx1 Capital Management LP
13D/G signal
Lynx1 Capital Management LP
Evidence rows
50
Latest as of
31 Mar 2026
13D/G
3/4/5
13F
Lead comparable stake: 11%
13D/G row: Lynx1 Capital Management LP
Showing first 8 of 50 holder rows.
Open remaining rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| Lynx1 Capital Management LP |
13D/G
3/4/5
13F
10%+ Owner · Company
|
11%
|
$18,351,871
1,538,296 shares
|
+$9,599,630 | 31 Mar 2026 |
| Venrock Healthcare Capital Partners III, L.P. |
13D/G
|
9.9%
|
$17,760,012
1,488,685 shares
|
$0 | 10 Mar 2026 |
| New Enterprise Associates 17, L.P. |
13D/G
3/4/5
Ali Behbahani · 10%+ Owner
|
9.9%
|
$17,130,522
1,456,677 shares
|
$0 | 10 Mar 2026 |
| Nantahala Capital Management, LLC |
13F
13D/G
Company
|
6.4%
from 13D/G
|
$7,471,608
660,036 shares
|
— | 31 Mar 2026 |
| CITADEL ADVISORS LLC |
13D/G
13F
Company
|
3.9%
|
$6,163,449
369,733 shares
|
$0 | 31 Dec 2024 |
| Deep Track Capital, LP |
13D/G
|
3%
|
$3,638,575
277,966 shares
|
$0 | 30 Jun 2025 |
| FMR LLC |
13F
13D/G
Company
|
0.4%
from 13D/G
|
$440,348
38,900 shares
|
— | 31 Mar 2026 |
| ALLIANCEBERNSTEIN L.P. |
13D/G
|
0.1%
|
$100,793
7,700 shares
|
-$9,138,050 | 30 Jun 2025 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
Forms 3/4/5 flow
Insider trading overview
Net insider flow leans to buying over the last 12 months. Net value: +$20,718,953.
Buys
$20,718,953
Insiders: 11
Sells
$0
Insiders: 0
Net
+$20,718,953
Shares: +1,864,940
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 1,864,940
Shares: 0
| Window (months) | Buy shares | Sell shares | Buy $ | Sell $ | Net $ |
|---|---|---|---|---|---|
| 0-3 | 1,864,940 | 0 | $20,718,953 | $0 | +$20,718,953 |
| 3-6 | 0 | 0 | $0 | $0 | $0 |
| 6-9 | 0 | 0 | $0 | $0 | $0 |
| 9-12 | 0 | 0 | $0 | $0 | $0 |
Reporting owners
Insider holders from Forms 3/4/5
Current reporting-owner rows connected to Korro Bio, Inc.. Open the relationship link for the CIK-to-CIK filing trail.
Rows
40
Lead holder
Weston Nichols
Net 12M change
+$20,718,953
Latest report
26 May 2026
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| Weston Nichols | 10%+ Owner | $16,305,937 | +$5,512 | +0.03% | Filing P/S | 31 Mar 2026 |
| Lynx1 Capital Management LP | 10%+ Owner | $16,305,937 | +$5,512 | +0.03% | Filing P/S | 31 Mar 2026 |
| Ali Behbahani | Director, 10%+ Owner | $15,263,221 | Mixed | 10 Mar 2026 | ||
| Rick Yang | 10%+ Owner | $14,419,591 | +$2,300,881 | +19% | Filing P/S | 10 Mar 2026 |
| Anthony A. Florence Jr. | 10%+ Owner | $14,419,591 | +$2,300,881 | +19% | Filing P/S | 10 Mar 2026 |
| Scott D. Sandell | 10%+ Owner | $14,419,591 | +$2,300,881 | +19% | Filing P/S | 10 Mar 2026 |
| Forest Baskett | 10%+ Owner | $14,419,591 | +$2,300,881 | +19% | Filing P/S | 10 Mar 2026 |
| Mohamad Makhzoumi | 10%+ Owner | $14,419,591 | +$2,300,881 | +19% | Filing P/S | 10 Mar 2026 |
| New Enterprise Associates 17, L.P. | 10%+ Owner | $14,419,591 | +$2,300,881 | +19% | Filing P/S | 10 Mar 2026 |
| Mathers Edward T. | 10%+ Owner | $14,419,591 | +$2,300,881 | +19% | Filing P/S | 10 Mar 2026 |
| Carmen Chang | 10%+ Owner | $14,419,591 | +$2,300,881 | +19% | Filing P/S | 10 Mar 2026 |
| Paul Edward Walker | 10%+ Owner | $14,419,591 | +$2,300,881 | +19% | Filing P/S | 10 Mar 2026 |
| Atlas Venture Opportunity Fund II, L.P. | 10%+ Owner | $10,924,144 | Filing P/S | 22 Apr 2024 | ||
| Ram Aiyar | President and CEO, Director | $1,071,019 | Median | 26 May 2026 | ||
| Jeffrey Cerio | General Counsel | $240,098 | Mixed | 02 Feb 2026 | ||
| Loic A. Vincent | Chief Scientific Officer | $124,426 | Mixed | 02 Feb 2026 | ||
| Oliver Dolan | Senior Vice President, Finance | $123,091 | Mixed | 02 Feb 2026 | ||
| Todd Chappell | Chief Operating Officer | $115,356 | Mixed | 02 Feb 2026 | ||
| Christopher R. Loose | Chief Scientific Officer | $97,335 | Mixed | 27 Jul 2023 | ||
| Peter P. Pfreundschuh | Chief Financial Officer | $84,231 | Mixed | 18 Feb 2022 | ||
| Quentin McCubbin | Chief Manufacturing Officer | $55,650 | Mixed | 26 Jan 2023 | ||
| Carl P. LeBel | Chief Development Officer | $48,230 | Mixed | 26 Jan 2023 | ||
| Wendy S. Arnold | Chief People Officer | $48,230 | Mixed | 26 Jan 2023 | ||
| Richard J. Mitrano | VP Finance & Operations | $27,819 | Mixed | 18 Aug 2023 | ||
| David L. Lucchino | Director | $11,740 | Mixed | 11 Jun 2024 | ||
| Vineet Agarwal | Chief Financial Officer | $0 | Mixed | 03 Feb 2025 | ||
| Marc A. Cohen | Director | Mixed | 21 Jun 2022 | |||
| Robert Langer | Director | Mixed | 17 Aug 2022 | |||
| Cynthia L. Feldmann | Director | Mixed | 17 Aug 2022 | |||
| Timothy J. Barberich | Director | Mixed | 17 Aug 2022 | |||
| Michael Huang | Director | Mixed | 17 Aug 2022 | |||
| Joel S. Marcus | Director | Mixed | 17 Aug 2022 | |||
| Jean Francois Formela | Director | Mixed | 11 Jun 2025 | |||
| Rachel Meyers | Director | Mixed | 11 Jun 2025 | |||
| Shelby J. Walker | Senior Vice President, General Counsel and Secretary | Mixed | 03 Nov 2023 | |||
| Timothy R. Pearson | Director | Mixed | 11 Jun 2025 | |||
| Katharine Knobil | Director | Mixed | 11 Jun 2025 | |||
| Olukemi Olugemo | Chief Medical Officer | Mixed | 03 Feb 2025 | |||
| Steve Colletti | Chief Scientific Officer | Mixed | 03 Nov 2023 | |||
| Nessan Bermingham | Director | Mixed | 11 Jun 2025 |
Recent Insider Transactions by Companies or Individuals for Korro Bio, Inc.
Showing up to 300 most recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | Reported value | Reported price | Shares | Shares owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| Ram Aiyar | KRRO | Common Stock | Award | 125% | 50,000 | 90,000 | 26 May 2026 | Direct | ||
| Lynx1 Capital Management LP | KRRO | Common stock, $0.001 par value per share | Purchase | 0.03% | $5,512 | $10.60 | 520 | 1,538,296 | 31 Mar 2026 | See footnote |
| Lynx1 Capital Management LP | KRRO | Common stock, $0.001 par value per share | Purchase | 0.03% | $5,512 | $10.60 | 520 | 1,538,296 | 31 Mar 2026 | See footnote |
| Rick Yang | KRRO | Common Stock | Purchase | 19% | $2,300,881 | $11.11 | 207,100 | 1,297,893 | 10 Mar 2026 | See Note 2 |
| Rick Yang | KRRO | Pre-Funded Warrants | Purchase | 242,945 | 242,945 | 10 Mar 2026 | See Note 2 | |||
| Scott D. Sandell | KRRO | Common Stock | Purchase | 19% | $2,300,881 | $11.11 | 207,100 | 1,297,893 | 10 Mar 2026 | See Note 2 |
| Scott D. Sandell | KRRO | Pre-Funded Warrants | Purchase | 242,945 | 242,945 | 10 Mar 2026 | See Note 2 | |||
| New Enterprise Associates 17, L.P. | KRRO | Common Stock | Purchase | 19% | $2,300,881 | $11.11 | 207,100 | 1,297,893 | 10 Mar 2026 | Direct |
| New Enterprise Associates 17, L.P. | KRRO | Pre-Funded Warrants | Purchase | 242,945 | 242,945 | 10 Mar 2026 | Direct | |||
| Carmen Chang | KRRO | Common Stock | Purchase | 19% | $2,300,881 | $11.11 | 207,100 | 1,297,893 | 10 Mar 2026 | See Note 2 |
| Carmen Chang | KRRO | Pre-Funded Warrants | Purchase | 242,945 | 242,945 | 10 Mar 2026 | See Note 2 | |||
| Ali Behbahani | KRRO | Common Stock | Award | 19% | 207,100 | 1,297,893 | 10 Mar 2026 | See Note 2 | ||
| Ali Behbahani | KRRO | Pre-Funded Warrants | Award | 242,945 | 242,945 | 10 Mar 2026 | See Note 2 | |||
| Forest Baskett | KRRO | Common Stock | Purchase | 19% | $2,300,881 | $11.11 | 207,100 | 1,297,893 | 10 Mar 2026 | See Note 2 |
| Forest Baskett | KRRO | Pre-Funded Warrants | Purchase | 242,945 | 242,945 | 10 Mar 2026 | See Note 2 | |||
| Mathers Edward T. | KRRO | Common Stock | Purchase | 19% | $2,300,881 | $11.11 | 207,100 | 1,297,893 | 10 Mar 2026 | See Note 2 |
| Mathers Edward T. | KRRO | Pre-Funded Warrants | Purchase | 242,945 | 242,945 | 10 Mar 2026 | See Note 2 | |||
| Mohamad Makhzoumi | KRRO | Common Stock | Purchase | 19% | $2,300,881 | $11.11 | 207,100 | 1,297,893 | 10 Mar 2026 | See Note 2 |
| Mohamad Makhzoumi | KRRO | Pre-Funded Warrants | Purchase | 242,945 | 242,945 | 10 Mar 2026 | See Note 2 | |||
| Paul Edward Walker | KRRO | Common Stock | Purchase | 19% | $2,300,881 | $11.11 | 207,100 | 1,297,893 | 10 Mar 2026 | See Note 2 |
| Paul Edward Walker | KRRO | Pre-Funded Warrants | Purchase | 242,945 | 242,945 | 10 Mar 2026 | See Note 2 | |||
| Anthony A. Florence Jr. | KRRO | Common Stock | Purchase | 19% | $2,300,881 | $11.11 | 207,100 | 1,297,893 | 10 Mar 2026 | See Note 2 |
| Anthony A. Florence Jr. | KRRO | Pre-Funded Warrants | Purchase | 242,945 | 242,945 | 10 Mar 2026 | See Note 2 | |||
| Ram Aiyar | KRRO | Common Stock | Award | 40,000 | 40,000 | 02 Feb 2026 | Direct | |||
| Ram Aiyar | KRRO | Stock Option (Right to Buy) | Award | 80,000 | 80,000 | 02 Feb 2026 | Direct | |||
| Loic A. Vincent | KRRO | Stock Option (Right to Buy) | Award | 35,000 | 35,000 | 02 Feb 2026 | Direct | |||
| Oliver Dolan | KRRO | Stock Option (Right to Buy) | Award | 15,000 | 15,000 | 02 Feb 2026 | Direct | |||
| Jeffrey Cerio | KRRO | Stock Option (Right to Buy) | Award | 23,000 | 23,000 | 02 Feb 2026 | Direct | |||
| Todd Chappell | KRRO | Stock Option (Right to Buy) | Award | 38,000 | 38,000 | 02 Feb 2026 | Direct | |||
| Todd Chappell | KRRO | Common Stock | Award | 20,132 | 20,132 | 15 Dec 2025 | Direct | |||
| Loic A. Vincent | KRRO | Common Stock | Award | 21,715 | 21,715 | 15 Dec 2025 | Direct | |||
| Jeffrey Cerio | KRRO | Common Stock | Award | 41,902 | 41,902 | 15 Dec 2025 | Direct | |||
| Oliver Dolan | KRRO | Common Stock | Award | 21,482 | 21,482 | 15 Dec 2025 | Direct | |||
| Ali Behbahani | KRRO | Stock Option (Right to Buy) | Award | 6,010 | 6,010 | 11 Jun 2025 | Direct | |||
| Rachel Meyers | KRRO | Stock Option (Right to Buy) | Award | 6,010 | 6,010 | 11 Jun 2025 | Direct | |||
| Nessan Bermingham | KRRO | Stock Option (Right to Buy) | Award | 6,010 | 6,010 | 11 Jun 2025 | Direct | |||
| Katharine Knobil | KRRO | Stock Option (Right to Buy) | Award | 6,010 | 6,010 | 11 Jun 2025 | Direct | |||
| Jean Francois Formela | KRRO | Stock Option (Right to Buy) | Award | 6,010 | 6,010 | 11 Jun 2025 | Direct | |||
| Timothy R. Pearson | KRRO | Stock Option (Right to Buy) | Award | 6,010 | 6,010 | 11 Jun 2025 | Direct |
An asterisk next to the price means the reported price is likely invalid.