Heron Patrick J purchased ~$36M in Mirum Pharmaceuticals, Inc. stock
Mirum Pharmaceuticals, Inc. (MIRM) · Data via SEC EDGAR Form 4
Price Performance · 10 days before → 90 days after trade
▲ = insider buy date
Trade Details · Public SEC Filing
Insider
Heron Patrick J
Role
—
Transaction
Open-Market Purchase
Approx. Value
~$36M
Trade Date
Jan 23, 2026
Company
Mirum Pharmaceuticals, Inc.
Ticker
MIRMSource
SEC EDGAR Form 4
Why This Trade Stands Out
Very Strong conviction signal
Scored in the top tier across multiple factors. Fewer than 5% of insider trades receive this rating.
~$36M purchase
Trades over $1M are rare. When insiders put this much of their own money on the line, they tend to have high conviction in their company's direction.
How good is Heron Patrick J at picking stocks?
Full track record: win rate, average return, and performance vs S&P 500
On January 23, 2026, Heron Patrick J — a corporate insider at Mirum Pharmaceuticals, Inc. — filed a Form 4 with the SEC disclosing an open-market purchase of approximately ~$36M in Mirum Pharmaceuticals, Inc. (MIRM) stock.
Under Section 16(a) of the Securities Exchange Act of 1934, corporate insiders must report all open-market stock transactions to the SEC within two business days. These filings — known as Form 4s — are publicly available on the SEC's EDGAR database. VeritySignals filters and scores the full Form 4 stream to surface high-conviction signals like this one.
VeritySignals Conviction Analysis
Full Conviction Analysis
Sign up free to see signal strength details, or upgrade for the full 15-factor breakdown.
Get notified the next time Heron Patrick J trades
Free alerts · No credit card · Instant notification
All data sourced from publicly available SEC Form 4 filings via EDGAR · Not financial advice · Past performance does not guarantee future results.
At a Glance
More MIRM Insider Activity
Peetz Christopher
Mar 16, 2026
~$14M
STRONG
Peetz Christopher
Mar 16, 2026
~$7.1M
VS
Peetz Christopher
Mar 16, 2026
~$14M
STRONG
Peetz Christopher
Feb 2, 2026
~$2.6M
STRONG
How to Read Insider Trades
What is this?
When company executives buy or sell their own stock, they must report it to the SEC within 2 days. These public filings reveal what the people who know the company best are doing with their own money.
Why does it matter?
Insiders can sell for many reasons (taxes, diversification, expenses), but they generally only buy for one: they think the stock is going up. That's why insider purchases are more predictive than sales.
What makes a trade "strong"?
We score trades on 15+ factors: the insider's role (CEO > director), trade size relative to their salary, whether other insiders also bought (clusters), and historical accuracy of the insider.
Never miss a signal
Get notified when high-conviction insiders buy. Free account, no credit card.
Sign up free