Inhibrx (INBX) CEO Mark Lappe Buys 10,000 Shares

What Happened

Mark P. Lappe, CEO of Inhibrx (INBX), reported four purchases (transaction code P) totaling 10,000 shares acquired on 2026-09-25 and 2026-09-28. The lots reported: 3,324 shares @ $98.87 ($328,630), 2,176 shares @ $99.60 ($216,727), 1,500 shares @ $98.88 ($148,320), and 3,000 shares @ $101.70 ($305,106), for aggregate proceeds of approximately $998,783. These were purchases (often viewed as a positive signal), not sales.

Key Details

• Transaction dates: 2026-09-25 (two purchases) and 2026-09-28 (two purchases).
• Reported prices/values: 3,324 @ $98.87 ($328,630); 2,176 @ $99.60 ($216,727); 1,500 @ $98.88 ($148,320); 3,000 @ $101.70 ($305,106). Total ≈ $998,783.
• Transaction type: P = Purchase (open market or private purchase as reported).
• Shares owned after transaction: Not specified in the provided filing excerpt.
• Notable footnotes: several purchases were executed in multiple trades and reported at weighted-average prices (ranges disclosed in footnotes, e.g., ~$98.27–$100.00 and ~$101.44–$101.80 for the different lots). The filing also notes certain securities are held by family trusts (Lappe Family Trust and a trust for immediate family beneficiaries); Mark Lappe is a trustee or an immediate family member and may be deemed to indirectly beneficially own those holdings. The reporting person offers to provide full transaction breakdowns upon request (per footnotes).
• Timeliness: Filing date 2026-09-28 for transactions on 9/25 and 9/28; the Form 4 was filed within the standard short reporting window (not indicated as late in this filing).

Context

Insider purchases increase an insider's stake and are often monitored by investors as a potential positive signal, but they do not disclose the insider's motivation. Several lots here were acquired via multiple trades and some shares are held in trusts that may create indirect beneficial ownership.