MIRM Mirum Pharmaceuticals, Inc.

NASDAQ
$83.92

Mirum Pharmaceuticals, Inc. (MIRM) Insider Activity

What the officers, directors and large holders did with their own shares. Only open-market purchases and sales count toward the totals — grants, option exercises and shares withheld for tax are compensation mechanics, not decisions, and they're listed separately below.

30D 90D 6M 1Y
Insider signal Moderately bearish Selling ran elevated versus MIRM's own trailing one-year pace, with 76% of sale value under a prearranged plan.
Cluster activity 0 buyers in the last 30 days 0 buyers in the last 90 days 3 sellers in the last 90 days
Insiders buying
0
0 transactions
Insiders selling
3
4 transactions
Purchases
$0
0 shares
Sales
$4.0M
40,601 shares
Net activity
-$4.0M
purchases less sales

How much of that selling was preplanned? 76% planned / 24% discretionary

10b5-1 plan sales $3.0M 3 transactions · 30,658 shares
Discretionary sales $978.1K 1 transaction · 9,943 shares

Largest single sale: $2.1M.

Where they traded

Buy Sell Dot area is proportional to transaction value.

Last open-market purchase: January 23, 2026 , by Heron Patrick J .

Recent open-market activity

Date Insider Role Action Shares Price Value Held after
BJERKHOLT ERIC CHIEF FINANCIAL OFFICER Sell 9,943 $98.37 $978.1K 44,745 −18.2% of holding
Howe Jolanda SVP, GLOBAL CONTROLLER Sell 10b5-1 658 $100.00 $65.8K 616 −51.6% of holding

Form 4s are due within two business days of a transaction, so this is close to real time — unlike the quarterly 13F data on the Institutional tab. A single large sale often reflects a prearranged 10b5-1 plan rather than a fresh view, so read a pattern of sales rather than any one of them.