Castagna Michael

In December 2025, Michael Castagna was selling MannKind shares the moment he received them: three separate times that month — December 12, 16 and 17 — he exercised options and sold the resulting shares the same day, at $6.00 to $6.01 apiece, a combined 107,920 shares worth roughly $648,000. By March 2026, his posture had reversed. On March 10, he bought 100,000 shares on the open market at $2.59 — roughly 57% below where he'd been selling four months earlier. That purchase sits alongside two enormous stock grants on March 23 (782,000 shares at $2.44, plus 796,000 more unpriced) and a cluster of smaller grants in late February at prices ranging from $1.42 to $4.55. His most recent activity, on July 15, 2026, was a 350,260-share option exercise paired with more than 363,000 shares withheld across four separate tax transactions at $4.09 — the largest single cluster of activity in this record. Across all 133 transactions since 2016, Castagna has bought 378,891 shares against 2,903,389 sold, but the March 2026 purchase stands out as a genuine, real-money commitment made as the stock traded well below where he'd been selling only months before.