RLYB Rallybio Corp Insider Trading

Adar1 Capital bought 16,209 shares at $13.98 across 3 transactions (May 18–19); stock up +207.0% in 90 days, all prior RLYB buys well-timed.

Adar1 Capital Management, the 10% owner, executed 3 separate purchases totaling 16,209 shares for $226,563.18 at an average blended price of $13.98, increasing holdings by 1.8% to 926,352 shares. The stock has rallied +207.0% over the prior 90 days and currently trades at $14.58, sitting -4.8% from its 52-week high of $15.31. Across all prior trades at Rallybio (3 prior buys), the insider's timing has been perfect: all 3 prior buys posted positive 90-day returns, with the most recent buy on 2026-05-05 generating a +0.2% 90-day return. The company remains unprofitable (net income $-8,278,000.00 in the latest quarter) despite +43.0% annual revenue growth and a market cap of $77,246,837.46, creating a profile of early-stage biotech risk typical of this insider's investment pattern.

Adar1 Capital Mgmt buys 79,559 shares of RLYB across 4 transactions for $1,112,976.94, lifting stake to 910,143 shares (+9.6%).

Adar1 Capital Management, LLC filed 4 separate purchases of Rallybio Corp (RLYB) totaling 79,559 shares for $1,112,976.94 at a blended average price of $13.99, bringing its post-transaction holdings to 910,143 shares. These purchases occur against a backdrop of a 30-day price change of +72.7% and a 90-day price change of +196.7%, with the current price of $14.30 sitting -6.6% from the 52-week high of $15.31. At this ticker specifically, Adar1's 3 prior buys on 2026-05-04 and 2026-05-05 each produced 90-day returns of +1.0%, +0.4%, and +0.2% respectively, all positive at the 90-day mark. Across all tickers in Adar1's cross-ticker track record, 11 prior buys show an average 90-day return of +21.0% with a 90-day win rate of 100.00%, while the company carries a quarterly net income of $-8,278,000.00 against revenue of $212,000.00.

Adar1 Capital Management adds ~50,800 shares of Rallybio (RLYB) across four open-market purchases, expanding its indirect stake to ~830,584 shares.

Adar1 Capital Management, a ten-percent beneficial owner of Rallybio, made four open-market purchases over two days, bringing its indirect stake from roughly 779,784 shares to approximately 830,584 shares — a meaningful expansion of an already substantial position. The stock has surged sharply over the past three months and is trading modestly below its 52-week high, meaning Adar1 is adding to its position at elevated prices rather than at a cyclical trough. Rallybio remains a pre-profitability, small-cap biotech with limited annual revenue, though the company has shown year-over-year revenue growth at the full-year level; investors should weigh the fund's accumulation against the company's still-developing financial profile. Adar1's three prior purchases at this ticker — all of which were followed by flat-to-marginally positive returns at both the 30-day and 90-day marks — do not yet provide a strong signal of outsized post-purchase price performance at this specific name, even as its broader cross-ticker track record of prior buys has been consistently positive. As an institutional holder rather than a company officer or director, this activity reflects a portfolio decision by a large fund, not a signal from someone with direct operational knowledge of Rallybio's business.

10% owner Adar1 Capital Management accumulates substantial RLYB stake across three days amid sharp rally and significant losses.

Adar1 Capital Management, a institutional holder owning approximately 10% of Rallybio, deployed significant capital across three consecutive trading days to add nearly 156,000 shares to its position. This multi-day accumulation occurred as the stock experienced a sharp rally—trading near its recent peaks after climbing substantially over recent months—yet the company remains deeply unprofitable with significant quarterly losses. The timing is noteworthy: rather than buying during weakness, the fund increased its stake while momentum was strong, suggesting either conviction in a fundamental turnaround or a portfolio rebalancing decision to maintain its ownership percentage as the stock gained value. Adar1's own track record shows eight prior purchases that generated positive average returns, though this particular accumulation comes against a backdrop of a cash-burning biotech with minimal revenue, raising questions about whether the fund is betting on a near-term catalyst or accepting fundamental risk for strategic reasons.