MTSR Metsera, Inc. Insider Trading

Director Paul Berns bought 790.0K shares of MTSR at $18.00 ($14.2M); cluster buy pattern with 2 other insiders in 14 days.

Director Paul L Berns purchased 789,998 shares at $18.00 on 2025-02-03, adding $14,219,964.00 to holdings that now total 8,313,680 shares, a 10.5% increase. This purchase occurs during a recent listing window (2 trading days post-IPO) and coincides with a cluster pattern: 2 other insiders also bought within the past 14 days. The acquisition price of $18.00 is notably below the current market price of $27.80, suggesting these accumulations preceded or were unaffected by subsequent price appreciation. The coordinated multi-director buying during the immediate post-listing period reflects board-level confidence in the newly public company, though this filing involves a derivative-conversion transaction—the full extent of Berns's position includes Table II derivative securities not yet fully captured in our database, so his total economic exposure may differ from the Table I share count shown.

ARCH Venture Partners XII acquired 2,222,222 shares for $39,999,996.00 at $18.00; cluster buy signal with 2 other insiders in 14 days.

ARCH Venture Partners XII, a 10% owner, executed 2 separate purchases totaling 2,222,222 shares for $39,999,996.00 at $18.00 on 2025-02-03, expanding holdings from 6.09M to 8.31M shares (+36.5%). This transaction arrives just 2 trading days post-IPO, when price discovery is ongoing; the current price of $27.80 exceeds the transaction price by 54%. A cluster pattern is present—2 other insiders also bought within the past 14 days—indicating broad insider appetite at post-listing valuations. The derivative-conversion flag indicates this filing reflects a conversion event (Table II activity not yet populated); the reported Table I shares represent only the equity leg, not the insider's total derivative-adjusted position. The scale of the acquisition ($40.0M) and the participation of multiple insiders within a narrow window suggest confidence in post-IPO fundamentals, though in a very-early-stage listing environment, sustained price discovery remains ahead.

Director Burow purchases 2,222,222 shares ($40.0M at $18.00) within 2-day listing; part of 3-insider cluster buy

Kristina Burow, a director at Metsera Inc., purchased 2,222,222 shares in two separate transactions on 2025-02-03 for $39,999,996.00 at $18.00 per share—equivalent to a 36.5% increase in her shareholdings from 6.09M to 8.31M shares. This $40.0M commitment by a board member occurs in a newly listed stock (2 trading days post-IPO) and coincides with a cluster pattern of insider buying: 2 other insiders also acquired shares within the past 14 days. The current market price of $27.80 reflects early trading dynamics post-listing. This filing contains a derivative conversion flag; the shareholder's full derivative position resides in Form 4 Table II, which is not yet populated in our database, so the Table I holdings reported here represent only the cash-settled or converted portion of her total position.