KRRO Korro Bio, Inc. Insider Trading

10% owner Lynx1 Capital bought 520 shares at $10.60 (worth $5,512), bringing holdings to 1,538,296 shares.

Lynx1 Capital Management LP, already a 10% shareholder, purchased 520 additional shares of Korro Bio at $10.60 on 2026-03-31, representing a modest addition of 0.0% to its existing 1.54M share position. The company is deeply unprofitable (full-year net income of $-18.1M) despite strong revenue growth of 181.5% year-over-year; current quarterly revenue is only $1.1M. The purchase price of $10.60 sits well below the current market price of $14.00, meaning the position has moved 31.6% favorably since the transaction, and notably this occurs within the 30-day window where KRRO stock gained 30.2%. Against Lynx1's cross-ticker buy track record (20 prior open-market purchases with 55.56% 90-day win rate and average 90-day return of 8.3%), this transaction is minimal in size and insufficient alone to signal material conviction in the turnaround.

10% owner Baskett Forest buys 207,100 shares of KRRO at $11.11; 8 other insiders bought in past 14 days amid -77.6% decline from 52-week high.

Baskett Forest, a 10% shareholder, purchased 207,100 shares for $2,300,881.00 on 2026-03-10 at $11.11, expanding holdings by 19.0% to 1,297,893 shares. This purchase occurs within a concentrated cluster: 8 other insiders also bought within the past 14 days, suggesting coordinated confidence among the insider group. However, context is mixed: the stock trades at $11.50 currently, down 77.6% from its 52-week high of $51.36, and Forest's prior KRRO purchase on 2024-04-22 saw a 90-day return of -18.6%, showing previous misjudgment at this ticker. The company reported revenue of $1,090,000.00 in its latest quarter with a net loss of -$18,061,000.00, though annual revenue growth reached +181.5%, indicating early-stage or transition-phase fundamentals. The cluster buying pattern and insider accumulation merit attention, but the severe price decline and unprofitable operations introduce material uncertainty about the conviction underlying the purchase.

10% owner Sandell Scott D buys 207,100 shares of KRRO at $11.11 as 8 other insiders buy within 14 days; stock down 77.6% from $51.36 high.

A 10% shareholder purchased 207,100 shares for $2.3M, increasing holdings by 19.0%, concurrent with a cluster of 8 other insiders buying within the past 14 days. This coordinated activity occurs against a backdrop of significant share price deterioration: KRRO trades at $11.50, down 77.6% from its 52-week high of $51.36 and down 5.3% over the prior 30 days, despite a 39.7% 90-day gain. Fundamentally, the company reported $1.1M in quarterly revenue with $-18.1M in net income (unprofitable over the full fiscal year), though annual revenue growth is at +181.5%. The insider's prior trade at KRRO (a buy on 2024-04-22) yielded a 90-day return of -18.6%, and his cross-ticker buy history shows mixed outcomes: 4 prior open-market buys averaged +32.8% 30-day returns but only +2.9% 90-day returns with a 66.67% win rate. The clustering of purchases from multiple insiders amid depressed valuations and losses warrants investor attention to whether management views the recent decline as an opportunity or a signal of fundamentals turning."

10% Owner Mathers Edward T buys 207,100 shares of KRRO at $11.11; stock down -77.6% from 52-week high amid unprofitable operations and revenue of $1.1M.

Mathers Edward T, a 10% owner, purchased 207,100 shares at $11.11 on 2026-03-10, increasing holdings by 19.0% to 1,297,893 shares and deploying $2.3M in capital. The transaction occurs within a cluster of 8 other insider buys over the past 14 days, suggesting coordinated management action. However, the stock trades at $11.50, down -77.6% from its 52-week high of $51.36, while the company remains unprofitable with net income of -$18.1M despite quarterly revenue of $1.1M and strong annual revenue growth of +181.5%. At the same ticker, Mathers' prior buy (2024-04-22) resulted in a -18.6% return over 90 days, and his cross-ticker track record shows mixed timing (66.67% win rate on buys). The confluence of material capital deployment by insiders, a depressed stock price relative to recent history, unprofitable fundamentals, and a prior loss-generating buy at this ticker warrants investor attention to whether this represents conviction in a turnaround or additional capital at risk in a struggling operation.

10% owner Paul Edward Walker buys 207,100 KRRO shares at $11.11 ($2.3M) amid 8-insider cluster; stock -77.6% from 52-week high.

Walker Paul Edward, a 10% owner, purchased 207,100 shares at $11.11 on 2026-03-10, increasing his holdings from 1,090,793 to 1,297,893 shares (+19.0%). The purchase occurs within a cluster pattern—8 other insiders also bought within the past 14 days—which may indicate coordinated confidence or response to company conditions. However, context raises caution: the stock trades at $11.50, down 77.6% from its 52-week high of $51.36, and the company reported a net loss of $-18,061,000.00 in its latest quarter despite 181.5% annual revenue growth. Walker's prior buy at KRRO on 2024-04-22 delivered a 90-day return of -18.6%, showing past purchases at this ticker have not been well-timed. The insider's cross-ticker track record shows a 66.67% 90-day win rate across 4 prior buys, but same-ticker execution at KRRO has lagged, warranting scrutiny of whether the cluster activity reflects genuine operational improvement or opportunistic accumulation amid depressed valuations.

10% owner Chang Carmen purchased 207,100 shares of KRRO at $11.11 for $2.3M; 8 other insiders also bought within 14 days amid -77.6% decline from 52-week high.

Chang Carmen, a 10% owner, purchased 207,100 shares at $11.11 on 2026-03-10, increasing holdings from 1,090,793 to 1,297,893 shares (+19.0%). This transaction occurs as the stock trades -77.6% from its 52-week high of $51.36, and notably, 8 other insiders also bought within the past 14 days, forming a cluster buy pattern. While the company posted strong revenue growth of +181.5% year-over-year and recently reported $1.1M in quarterly revenue, it remains unprofitable with a net loss of $-18.1M over its most recent full fiscal year. Chang's prior buy at KRRO in April 2024 returned -18.6% over 90 days, suggesting this ticker has not been a reliable vehicle despite his cross-ticker track record showing a +2.9% average 90-day return across other holdings. The confluence of cluster buying activity at a depressed valuation alongside persistent unprofitability warrants close observation of whether this represents conviction-driven accumulation or a potential signal of mispricing in a volatile biotech name.

10% owner Makhzoumi bought 207,100 shares of KRRO at $11.11 on 2026-03-10; stock now -77.6% from 52-week high; cluster buy by 8 others in 14 days

Makhzoumi Mohamad, a 10% owner, purchased 207,100 shares for $2,300,881.00, increasing his stake by 19.0% to 1.30M shares. This buy occurs within a broader cluster pattern: 8 other insiders also bought within the past 14 days, suggesting coordinated or simultaneous insider interest. However, context tempers conviction signals: the stock trades at -77.6% from its 52-week high of $51.36, and Makhzoumi's sole prior buy at KRRO (2024-04-22) returned -18.6% over 90 days. The company remains unprofitable with a $-18.1M net loss in the latest quarter, though revenue grew 181.5% year-over-year. The clustering pattern and large absolute purchase warrant monitoring, but the steep valuation decline and Makhzoumi's poor prior timing at this ticker suggest investors should scrutinize both the fundamental recovery thesis and whether the cluster reflects informed conviction or reactive buying into a depressed price.

New Enterprise Associates 17 bought 207,100 KRRO shares at $11.11; stock down -77.6% from 52-week high amid cluster buy by 8 other insiders.

New Enterprise Associates 17, a 10% owner, purchased 207,100 shares at $11.11 on 2026-03-10, increasing its holding by 19.0% to 1,297,893 shares. The purchase occurs as the stock trades -77.6% from its $51.36 52-week high and -5.3% over the past 30 days, though it has gained 39.7% over 90 days. A cluster of 8 other insiders also bought within the past 14 days, suggesting coordinated or opportunistic accumulation at depressed levels. However, context tempers the signal: the company is unprofitable (net income of $-18,061,000.00 for the most recent full fiscal year) with quarterly revenue of $1,090,000.00, and this particular insider's prior buy at KRRO in April 2024 showed poor timing (30d return -10.4%, 90d return -18.6%). The cross-ticker track record (37.7% avg 30d return but -0.1% avg 90d return, 50% win rate) suggests inconsistent execution on buy timing across different securities.

10% Owner Yang Rick bought 207,100 shares of KRRO at $11.11 ($2.3M); stock down -77.6% from $51.36 high; 8 other insiders also bought in 14-day cluster.

Yang Rick (10% Owner) purchased 207,100 shares for $2,300,881.00 at $11.11 per share on 2026-03-10, bringing total holdings to 1,297,893 shares. This purchase occurs while KRRO trades at $11.50, off -77.6% from its 52-week high of $51.36, and coincides with a broader cluster pattern: 8 other insiders also bought within the same 14-day window. At the fundamentals level, the company reported revenue of $1,090,000.00 in the latest quarter with net income of $-18,061,000.00 and is unprofitable on a full-year basis, though annual revenue growth reached +181.5%. Yang's prior buy at KRRO on 2024-04-22 delivered negative 90-day returns (-18.6%), establishing a pattern of poorly-timed entry points at this ticker; his cross-ticker track record shows a 66.67% win rate on buys, but that prior miss at KRRO suggests caution. The multi-insider buy cluster against a deeply depressed valuation backdrop and unprofitable fundamentals warrants close monitoring of the company's path to profitability and any material operational or capital developments.

10% Owner Florence Anthony A. Jr. buys 207,100 shares of KRRO at $11.11; 8 other insiders bought within 14 days amid -77.6% decline from 52-week high.

Florence Anthony A. Jr., a 10% owner of Korro Bio, purchased 207,100 shares at $11.11 on 2026-03-10, expanding his holdings to 1,297,893 shares (+19.0% increase). The transaction occurs against a backdrop of significant stock weakness: the current price of $11.50 stands 77.6% below the 52-week high of $51.36. A cluster pattern emerges with 8 other insiders also buying within the past 14 days, suggesting coordinated appetite for shares at depressed levels. However, context reveals material headwinds: the company reported $1.1M in quarterly revenue against a $-18.1M net loss, remains unprofitable, and Anthony's sole prior purchase at KRRO on 2024-04-22 declined 18.6% over 90 days—establishing a 0% win rate at this specific ticker. The cross-ticker track record (66.67% 90-day win rate, +2.9% average 90d return) does not yet demonstrate execution strength at KRRO itself, where the stock has compressed substantially from its recent highs.