Mirum (MIRM) CFO Eric Bjerkholt Sells 9,943 Shares

What Happened Eric Bjerkholt, Chief Financial Officer of Mirum Pharmaceuticals (MIRM), had restricted stock units convert into 18,333 shares on 2026-09-11 and immediately had 18,333 shares withheld to satisfy tax withholding obligations (no cash received for the withheld shares). He then sold 9,943 shares in an open-market transaction on 2026-09-14 at $98.37 per share for total proceeds of $978,093. The derivative code (M) reflects an exercise/conversion event tied to equity awards.

Key Details

• Transaction dates/prices:
  • 2026-09-11: 18,333 RSUs converted to shares (reported as acquired); 18,333 shares disposed at $0 (withheld for taxes).
  • 2026-09-14: 9,943 shares sold open market at $98.37 for $978,093 total.
• Shares owned after transaction: Not specified in the filing.
• Footnotes:
  • F1: Each restricted stock unit (RSU) entitles the holder to one share (or cash equivalent).
  • F2: Shares were sold/withheld to cover tax withholding on RSU vesting.
  • F3: These RSUs vest in three equal annual installments beginning Sept 11, 2023.
• Filing timeliness: The Form 4 was filed on 2026-09-15; the filing does not indicate a late filing flag.

Context

• The 9/11 conversion was a vesting/exercise of RSUs; the zero-dollar disposition represents shares withheld to cover taxes (a common, administrative action), not a cash sale. The separate 9/14 open-market sale produced nearly $1.0M in proceeds.
• Sales by executives are common and can be routine (tax withholding or diversification); they are not necessarily a signal of company prospects. Purchases would generally be more indicative of bullish insider sentiment.