Tross Stuart A 4

What Happened
Stuart A. Tross, MannKind’s Chief People & Workplace Officer, acquired 15,290 common shares on March 1, 2026 for $3.27 each (total ≈ $49,998) through the company’s Market Price Stock Purchase Plan. In addition, on February 26, 2026 Tross recorded acquisition of 20,000 and 28,143 shares (48,143 total) related to partial vesting of previously granted performance-based options; those derivative acquisitions are reported at $0.00 in the filing because they reflect option vesting upon achievement of defined performance milestones.

Key Details

• Transaction dates and prices: Feb 26, 2026 — 20,000 and 28,143 shares (derivative vesting, $0.00); Mar 1, 2026 — 15,290 shares at $3.27 each (~$49,998).
• Method: 15,290 shares purchased via the Issuer’s Market Price Stock Purchase Plan (plan effective May 13, 2023); Board approved the purchase on March 1, 2026 (Footnote F1).
• Vesting background: The 20,000 and 28,143-share items reflect partial vesting of options granted Feb 16, 2017 and May 25, 2017, respectively, after meeting performance milestones (Footnotes F2, F3).
• Shares owned after the transactions: Not specified in the summary data provided; see the full Form 4 for total beneficial ownership.
• Timeliness: Form 4 was filed March 2, 2026; the filing appears to be timely (no late filing flag).

Context

• The $49,998 open-market-style purchase is a cash purchase under the company plan (a straightforward acquisition signal).
• The other items are derivative vesting events (options that became vested due to performance milestones), not sales; they do not indicate any immediate cashless sale.
• These are insider acquisitions (purchase + option vesting), which retail investors often view as more informative than routine sales; however, filings are factual and do not explain the insider’s motives.