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Korro Bio, Inc.

KRRO
Exchange
Nasdaq
Industry
Pharmaceutical Preparations
SEC CIK
0001703647

In the last 90 days, Korro Bio, Inc. insiders filed 1 open-market purchase and 8 sales; 106 institutions reported holding it in 13F filings for Q2 2026, worth $198.8M in total; no superinvestor holds it.

Open-market trades, last 90 days

Open-market purchases (P) and sales (S) by Korro Bio, Inc. insiders, counted by Form 4 filing. Trades with a flagged price and duplicate filings are left out.

Open-market buys
1 filing
1 insider, $78.8K in total
Open-market sells
8 filings
3 insiders, $2.82M in total
Insiders trading
4
Net value
−$2.75M
Purchases minus sales

Insider roster

Directors, officers and 10% owners who have filed a Form 4 for Korro Bio, Inc., current and former, most recent filer first. Last reported holding is the position after the last non-derivative trade in their latest filing.

Insider roster for Korro Bio, Inc.
NameTitleLast reported holdingLast filingFilings, past year
Formela Jean FrancoisDirector132,650IndirectSep 15, 20268
Dolan OliverSenior Vice President, Finance16,241Sep 14, 20266
Nichols Weston10% Owner1,544,980IndirectAug 13, 20262
Lynx1 Capital Management LP10% Owner1,544,980IndirectAug 13, 20262
Aiyar RamPresident and CEO69,046Aug 5, 20264
Vincent Loic AChief Scientific Officer25,797Jul 17, 20264
Cerio JeffreyGeneral Counsel41,793Jul 17, 20264
Chappell ToddChief Operating Officer24,464Jul 17, 20264
Bermingham NessanDirector35,114Jun 11, 20261
Pearson Timothy RDirector–Jun 11, 20261
Behbahani AliDirector1,297,893IndirectJun 11, 20262
Knobil KatharineDirector–Jun 11, 20261
Meyers RachelDirector–Jun 11, 20261
New Enterprise Associates 17, L.P.10% Owner1,297,893Mar 12, 20261
NEA Partners 17, L.P.10% Owner1,297,893Mar 12, 20261
Nea 17 GP, LLC10% Owner1,297,893Mar 12, 20261
Sandell Scott D10% Owner1,297,893IndirectMar 12, 20261
Baskett Forest10% Owner1,297,893IndirectMar 12, 20261
Mathers Edward T10% Owner1,297,893IndirectMar 12, 20261
Walker Paul Edward10% Owner1,297,893IndirectMar 12, 20261
Florence Anthony A. Jr.10% Owner1,297,893IndirectMar 12, 20261
Makhzoumi Mohamad10% Owner1,297,893IndirectMar 12, 20261
Chang Carmen10% Owner1,297,893IndirectMar 12, 20261
Yang Rick10% Owner1,297,893IndirectMar 12, 20261
Agarwal VineetChief Financial Officer0Feb 5, 20250
Olugemo OlukemiChief Medical Officer–Feb 5, 20250
Lucchino David L.Director22,150Jun 12, 20240
Atlas Venture Opportunity Fund II, L.P.10% Owner195,074Apr 23, 20240
Atlas Venture Associates Opportunity II, LLC10% Owner195,074Apr 23, 20240
Atlas Venture Associates Opportunity II, LP10% Owner195,074Apr 23, 20240
Colletti SteveChief Scientific Officer–Nov 7, 20230
Walker Shelby J.See Remarks–Nov 7, 20230
Mitrano Richard J.VP Finance & Operations48,457Aug 22, 20230
Loose Christopher R.Chief Scientific Officer183,650Jul 31, 20230
LeBel CarlChief Development Officer26,343Jan 27, 20230
Arnold Wendy SChief People Officer21,186Jan 27, 20230
McCubbin QuentinChief Manufacturing Officer38,340Jan 27, 20230
Barberich Timothy JDirector–Aug 19, 20220
Marcus Joel SDirector–Aug 19, 20220
Langer RobertDirector–Aug 19, 20220
Feldmann Cynthia LDirector–Aug 19, 20220
Huang MichaelDirector–Aug 19, 20220
Cohen Marc ADirector–Jun 23, 20220
Pfreundschuh Peter P.Chief Financial Officer8,927Feb 23, 20220

Insider trades

Each row adds up one type of transaction in one Form 4 filing. Only open-market purchases (P) and sales (S) are shown by default; use the filters to see grants, option exercises and other codes.

Insider trades
Filed (ET)Trade dateFiling delayInsiderTransactionSharesAvg priceValueHolding changeFlags
Sep 15, 2026 (view filing)4:15 PM ETSep 11-144 daysFormela Jean FrancoisDirectorSSale−48.7K$14.09−$686.2K−26.9%132.7K after4 lots10b5-1
Sep 14, 2026 (view filing)4:05 PM ETSep 113 daysDolan OliverSenior Vice President, FinanceSSale−5$13.72−$68.580.0%16.2K after10b5-1
Sep 10, 2026 (view filing)4:05 PM ETSep 8-92 daysDolan OliverSenior Vice President, FinanceSSale−7.35K$13.51−$99.4K−31.2%16.2K after2 lots10b5-1
Aug 28, 2026 (view filing)4:30 PM ETAug 262 daysFormela Jean FrancoisDirectorSSale−300$13.96−$4.19K−0.2%141.0K after2 lots10b5-1
Aug 21, 2026 (view filing)4:20 PM ETAug 192 daysFormela Jean FrancoisDirectorSSale−28.5K$14.00−$398.6K−16.8%141.1K after2 lots10b5-1
Aug 13, 2026 (view filing)5:04 PM ETAug 112 daysFormela Jean FrancoisDirectorSSale−2.14K$13.96−$29.9K−1.4%145.9K after2 lots10b5-1
Aug 13, 2026 (view filing)9:54 AM ETAug 6-107 daysLateNichols Weston and 1 other10% OwnerPPurchaseCommon stock, $0.001 par value per share+6.68K$11.79+$78.8K+0.4%1.54M after2 lots
Aug 5, 2026 (view filing)4:05 PM ETAug 41 dayAiyar RamPresident and CEOSSale−5.80K$10.84−$62.9K−7.8%69.0K after
Jul 7, 2026 (view filing)6:04 PM ETJul 2-65 daysFormela Jean FrancoisDirectorSSale−110.0K$14.02−$1.54M−42.9%146.3K after4 lots10b5-1
Jun 24, 2026 (view filing)Jun 22-242 daysFormela Jean FrancoisDirectorSSale−171.4K$14.34−$2.46M−50.3%169.6K after8 lots10b5-1
Jun 17, 2026 (view filing)Jun 161 dayChappell ToddChief Operating OfficerSSale−3.17K$10.83−$34.3K−15.7%17.0K after
Jun 17, 2026 (view filing)Jun 161 dayVincent Loic AChief Scientific OfficerSSale−3.42K$10.83−$37.0K−15.7%18.3K after
Jun 17, 2026 (view filing)Jun 161 dayCerio JeffreyGeneral CounselSSale−6.61K$10.83−$71.6K−15.8%35.3K after
Jun 17, 2026 (view filing)Jun 161 dayDolan OliverSenior Vice President, FinanceSSale−3.38K$10.83−$36.6K−15.7%18.1K after
Jun 2, 2026 (view filing)May 294 daysAiyar RamPresident and CEOSSale−15.2K$12.98−$196.7K−16.8%74.8K after
Jun 1, 2026 (view filing)May 284 daysFormela Jean FrancoisDirectorSSale−2.86K$13.95−$39.9K−1.4%194.7K after2 lots10b5-1
Apr 2, 2026 (view filing)12:00 PM ETMar 312 daysNichols Weston and 1 other10% OwnerPPurchaseCommon stock, $0.001 par value per share+520$10.60+$5.51K0.0%1.54M after
Mar 12, 2026 (view filing)8:15 PM ETMar 102 daysNew Enterprise Associates 17, L.P. and 2 others10% OwnerPPurchase+207.1K$11.11+$2.30M+19.0%1.30M afterDuplicate filing
Mar 12, 2026 (view filing)8:15 PM ETMar 102 daysNew Enterprise Associates 17, L.P. and 2 others10% OwnerPPurchase+242.9K$11.11+$2.70M–242.9K afterDerivative
Mar 12, 2026 (view filing)Mar 102 daysYang Rick10% OwnerPPurchase+207.1K$11.11+$2.30M+19.0%1.30M afterDuplicate filing
Mar 12, 2026 (view filing)Mar 102 daysYang Rick10% OwnerPPurchase+242.9K$11.11+$2.70M–242.9K afterDerivativeDuplicate filing
Mar 12, 2026 (view filing)Mar 102 daysSandell Scott D10% OwnerPPurchase+207.1K$11.11+$2.30M+19.0%1.30M afterDuplicate filing
Mar 12, 2026 (view filing)Mar 102 daysSandell Scott D10% OwnerPPurchase+242.9K$11.11+$2.70M–242.9K afterDerivativeDuplicate filing
Mar 12, 2026 (view filing)Mar 102 daysChang Carmen10% OwnerPPurchase+207.1K$11.11+$2.30M+19.0%1.30M afterDuplicate filing
Mar 12, 2026 (view filing)Mar 102 daysChang Carmen10% OwnerPPurchase+242.9K$11.11+$2.70M–242.9K afterDerivativeDuplicate filing
Mar 12, 2026 (view filing)Mar 102 daysBaskett Forest10% OwnerPPurchase+207.1K$11.11+$2.30M+19.0%1.30M afterDuplicate filing
Mar 12, 2026 (view filing)Mar 102 daysBaskett Forest10% OwnerPPurchase+242.9K$11.11+$2.70M–242.9K afterDerivativeDuplicate filing
Mar 12, 2026 (view filing)Mar 102 daysMathers Edward T10% OwnerPPurchase+207.1K$11.11+$2.30M+19.0%1.30M afterDuplicate filing
Mar 12, 2026 (view filing)Mar 102 daysMathers Edward T10% OwnerPPurchase+242.9K$11.11+$2.70M–242.9K afterDerivativeDuplicate filing
Mar 12, 2026 (view filing)Mar 102 daysWalker Paul Edward10% OwnerPPurchase+207.1K$11.11+$2.30M+19.0%1.30M afterDuplicate filing
Mar 12, 2026 (view filing)Mar 102 daysWalker Paul Edward10% OwnerPPurchase+242.9K$11.11+$2.70M–242.9K afterDerivativeDuplicate filing
Mar 12, 2026 (view filing)Mar 102 daysMakhzoumi Mohamad10% OwnerPPurchase+207.1K$11.11+$2.30M+19.0%1.30M afterDuplicate filing
Mar 12, 2026 (view filing)Mar 102 daysMakhzoumi Mohamad10% OwnerPPurchase+242.9K$11.11+$2.70M–242.9K afterDerivativeDuplicate filing
Mar 12, 2026 (view filing)Mar 102 daysFlorence Anthony A. Jr.10% OwnerPPurchase+207.1K$11.11+$2.30M+19.0%1.30M after
Mar 12, 2026 (view filing)Mar 102 daysFlorence Anthony A. Jr.10% OwnerPPurchase+242.9K$11.11+$2.70M–242.9K afterDerivative
Nov 12, 2024 (view filing)Nov 111 dayAgarwal VineetChief Financial OfficerSSale−800$70.00−$56.0K−100.0%0 after10b5-1
Oct 18, 2024 (view filing)Oct 171 dayAgarwal VineetChief Financial OfficerSSale−10.2K$78.26−$799.5K−100.0%0 after11 lots10b5-1
Apr 24, 2024 (view filing)5:00 PM ETApr 222 daysNew Enterprise Associates 17, L.P. and 2 others10% OwnerPPurchase+17.9K$56.00+$1.00M+1.7%1.09M afterDuplicate filing
Apr 24, 2024 (view filing)Apr 222 daysChang Carmen10% OwnerPPurchase+17.9K$56.00+$1.00M+1.7%1.09M afterDuplicate filing
Apr 24, 2024 (view filing)Apr 222 daysBaskett Forest10% OwnerPPurchase+17.9K$56.00+$1.00M+1.7%1.09M afterDuplicate filing
Apr 24, 2024 (view filing)Apr 222 daysWalker Paul Edward10% OwnerPPurchase+17.9K$56.00+$1.00M+1.7%1.09M afterDuplicate filing
Apr 24, 2024 (view filing)Apr 222 daysFlorence Anthony A. Jr.10% OwnerPPurchase+17.9K$56.00+$1.00M+1.7%1.09M afterDuplicate filing
Apr 24, 2024 (view filing)Apr 222 daysMathers Edward T10% OwnerPPurchase+17.9K$56.00+$1.00M+1.7%1.09M afterDuplicate filing
Apr 24, 2024 (view filing)Apr 222 daysYang Rick10% OwnerPPurchase+17.9K$56.00+$1.00M+1.7%1.09M afterDuplicate filing
Apr 24, 2024 (view filing)Apr 222 daysMakhzoumi Mohamad10% OwnerPPurchase+17.9K$56.00+$1.00M+1.7%1.09M afterDuplicate filing
Apr 24, 2024 (view filing)Apr 222 daysSandell Scott D10% OwnerPPurchase+17.9K$56.00+$1.00M+1.7%1.09M after
Apr 23, 2024 (view filing)5:23 PM ETApr 221 dayAtlas Venture Opportunity Fund II, L.P. and 2 others10% OwnerPPurchase+17.9K$56.00+$1.00M+10.1%195.1K after
Nov 27, 2023 (view filing)Nov 225 daysLucchino David L.DirectorSSale−1.16K$37.69−$43.6K−5.0%22.1K after4 lots
Nov 22, 2023 (view filing)Nov 1012 daysLateLucchino David L.DirectorSSale−968$41.97−$40.6K−4.0%23.3K after7 lots
Aug 22, 2023 (view filing)Aug 18-214 daysMitrano Richard J.VP Finance & OperationsSSale−464$0.5789−$268.62−0.9%48.5K after2 lots10b5-1