MIRM Mirum Pharmaceuticals, Inc.

NASDAQ
$98.22

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 In line Selling ran in line with MIRM's own trailing one-year pace, with 59% 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
1
1 transaction
Insiders selling
8
61 transactions
Purchases
$9.0M
131,425 shares
Sales
$43.2M
483,311 shares
Net activity
-$34.2M
purchases less sales

How much of that selling was preplanned? 59% planned / 41% discretionary

10b5-1 plan sales $25.4M 38 transactions · 290,814 shares
Discretionary sales $17.8M 23 transactions · 192,497 shares

Largest single sale: $4.0M.

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
Howe Jolanda SVP, GLOBAL CONTROLLER Sell 10b5-1 658 $100.00 $65.8K 616 −51.6% of holding
Peetz Christopher 2 fills CHIEF EXECUTIVE OFFICER Sell 10b5-1 30,000 $98.68 $3.0M 216,128 −12.2% of holding
Howe Jolanda SVP, GLOBAL CONTROLLER Sell 40,000 $100.00 $4.0M 1,274 −96.9% of holding
BJERKHOLT ERIC CHIEF FINANCIAL OFFICER Sell 10b5-1 6,001 $99.90 $599.5K 36,355 −14.2% of holding
Peetz Christopher 3 fills CHIEF EXECUTIVE OFFICER Sell 10b5-1 20,000 $98.92 $2.0M 202,626 −9% of holding
Howe Jolanda SVP, GLOBAL CONTROLLER Sell 10b5-1 1,840 $105.29 $193.7K 1,274 −59.1% of holding
Peetz Christopher 4 fills CHIEF EXECUTIVE OFFICER Sell 10b5-1 20,000 $122.27 $2.4M 202,175 −9% of holding
BJERKHOLT ERIC 4 fills CHIEF FINANCIAL OFFICER Sell 10b5-1 5,000 $122.25 $611.3K 44,057 −10.2% of holding
Howe Jolanda SVP, GLOBAL CONTROLLER Sell 10b5-1 2,721 $120.00 $326.5K 3,114 −46.6% of holding
Howe Jolanda SVP, GLOBAL CONTROLLER Sell 10b5-1 2,594 $101.95 $264.5K 5,835 −30.8% of holding
BJERKHOLT ERIC 3 fills CHIEF FINANCIAL OFFICER Sell 10b5-1 5,000 $93.82 $469.1K 47,530 −9.5% of holding
Peetz Christopher 6 fills CHIEF EXECUTIVE OFFICER Sell 10b5-1 30,000 $95.84 $2.9M 221,707 −11.9% of holding
Ramasastry Saira Director Sell 3,977 $100.00 $397.7K None left
Ramasastry Saira Director Sell 10b5-1 2,000 $109.47 $218.9K None left
Ramasastry Saira Director Sell 10b5-1 2,000 $96.90 $193.8K None left
Peetz Christopher CHIEF EXECUTIVE OFFICER Sell 40,985 $91.98 $3.8M 194,309 −17.4% of holding
Radovich Peter PRESIDENT AND COO Sell 16,515 $91.98 $1.5M 40,272 −29.1% of holding
Quan Joanne CHIEF MEDICAL OFFICER Sell 7,287 $91.98 $670.2K 18,864 −27.9% of holding
BJERKHOLT ERIC CHIEF FINANCIAL OFFICER Sell 7,287 $91.98 $670.2K 49,788 −12.8% of holding
Howe Jolanda SVP, GLOBAL CONTROLLER Sell 4,732 $91.98 $435.2K 8,429 −36% of holding
Ramasastry Saira Director Sell 10b5-1 2,000 $90.76 $181.5K None left
Ramasastry Saira Director Sell 10b5-1 2,000 $102.09 $204.2K None left
Peetz Christopher CHIEF EXECUTIVE OFFICER Sell 9,108 $103.30 $940.9K 160,294 −5.4% of holding
Radovich Peter PRESIDENT AND COO Sell 2,631 $103.30 $271.8K 20,655 −11.3% of holding
Howe Jolanda SVP, GLOBAL CONTROLLER Sell 968 $103.30 $100.0K 4,503 −17.7% of holding
Peetz Christopher CHIEF EXECUTIVE OFFICER Sell 6,831 $96.19 $657.1K 169,402 −3.9% of holding
Radovich Peter PRESIDENT AND COO Sell 3,143 $96.19 $302.3K 23,286 −11.9% of holding
BJERKHOLT ERIC CHIEF FINANCIAL OFFICER Sell 1,053 $96.19 $101.3K 43,741 −2.4% of holding
Howe Jolanda SVP, GLOBAL CONTROLLER Sell 842 $96.19 $81.0K 3,700 −18.5% of holding
Heron Patrick J Director Buy 131,425 $68.48 $9.0M 459,010
Peetz Christopher CHIEF EXECUTIVE OFFICER Sell 7,098 $93.33 $662.4K 163,733 −4.2% of holding
Radovich Peter PRESIDENT AND COO Sell 2,382 $93.33 $222.3K 20,679 −10.3% of holding
Quan Joanne CHIEF MEDICAL OFFICER Sell 1,822 $93.33 $170.0K 12,817 −12.4% of holding
BJERKHOLT ERIC CHIEF FINANCIAL OFFICER Sell 1,421 $93.33 $132.6K 42,127 −3.3% of holding
Howe Jolanda SVP, GLOBAL CONTROLLER Sell 926 $93.33 $86.4K 3,042 −23.3% of holding
Quan Joanne CHIEF MEDICAL OFFICER Sell 6,911 $90.27 $623.9K 11,305 −37.9% of holding
Ramasastry Saira Director Sell 10b5-1 2,000 $90.99 $182.0K None left
Ramasastry Saira Director Sell 10b5-1 5,000 $80.00 $400.0K None left
GREY MICHAEL G Director Sell 10b5-1 50,000 $78.00 $3.9M None left
Ramasastry Saira 2 fills Director Sell 10b5-1 2,000 $69.73 $139.5K 1,000 −66.7% of holding
GREY MICHAEL G Director Sell 10b5-1 50,000 $74.00 $3.7M None left
GREY MICHAEL G Director Sell 10b5-1 50,000 $70.00 $3.5M None left
BJERKHOLT ERIC CHIEF FINANCIAL OFFICER Sell 9,578 $76.01 $728.0K 39,945 −19.3% 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.