Mirum Pharmaceuticals (MIRM) director sells 3,977 shares under 10b5-1 plan
Filing Impact
Filing Sentiment
Form Type
4
Rhea-AI Filing Summary
Mirum Pharmaceuticals director Saira Ramasastry reported an exercise-and-sale transaction involving 3,977 shares of common stock. On May 29, 2026, 3,977 restricted stock units were converted into 3,977 shares of common stock at a stated price of $0.0000 per share. On June 1, 2026, all 3,977 shares were sold in an open-market transaction at $100.0000 per share, leaving 0 shares of common stock reported as directly held after the sale. The filing notes that the sale was carried out under a pre-arranged Rule 10b5-1 trading plan adopted on September 18, 2025, indicating the timing was set in advance.
Positive
- None.
Negative
- None.
Insider Trade Summary
Net Seller: 3,977 shares ($397,700)
Net Sell
3 txns
Insider
Ramasastry Saira
Role
null
Sold
3,977 shs ($398K)
| Type | Security | Shares | Price | Value |
|---|---|---|---|---|
| Sale | Common Stock | 3,977 | $100.00 | $398K |
| Exercise | Restricted Stock Units | 3,977 | $0.00 | -- |
| Exercise | Common Stock | 3,977 | $0.00 | -- |
Holdings After Transaction:
Common Stock — 0 shares (Direct, null);
Restricted Stock Units — 0 shares (Direct, null)
Footnotes (1)
- Each restricted stock unit represents a contingent right to receive one share of common stock (or its cash equivalent, at the discretion of the Issuer). Reported transaction occurred pursuant to a Rule 10b5-1 Plan adopted by the reporting person on September 18, 2025. Each restricted stock unit represents a contingent right to receive one share of the Issuer's common stock and vests on May 29, 2026.
Key Figures
Shares sold: 3,977 shares
Sale price per share: $100.0000 per share
Shares exercised from RSUs: 3,977 shares
+2 more
5 metrics
Shares sold
3,977 shares
Common stock sold on June 1, 2026
Sale price per share
$100.0000 per share
Open-market sale of common stock
Shares exercised from RSUs
3,977 shares
RSUs converted to common stock on May 29, 2026
Shares held after transaction
0.0000 shares
Total directly held common stock following sale
Net share change
-3,977 shares
NetBuySellShares from transaction summary
Key Terms
Restricted Stock Units, Rule 10b5-1 Plan, open-market sale, derivative security
4 terms
Restricted Stock Units financial
"Each restricted stock unit represents a contingent right to receive one share of common stock"
Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.
Rule 10b5-1 Plan regulatory
"Reported transaction occurred pursuant to a Rule 10b5-1 Plan adopted by the reporting person"
A Rule 10b5-1 plan is a prearranged, written schedule that lets corporate insiders buy or sell company stock at set times or amounts, even if they later learn material nonpublic information. Think of it like setting an automatic thermostat for trades: it creates a clear record that trades were planned in advance, reducing the risk of insider-trading accusations and helping investors trust that insider transactions are routine rather than based on secret information.
open-market sale financial
"transaction_action": "open-market sale""
An open-market sale is when a shareholder sells existing shares directly on a public exchange to any willing buyer, rather than through a private deal. Think of it like putting goods on a busy market stall where price is set by supply and demand; for investors it matters because such sales increase available supply, can put short-term downward pressure on the stock price, and signal changes in liquidity or investor confidence.
derivative security financial
"transaction_code_description": "Exercise or conversion of derivative security""
A derivative security is a financial contract whose value comes from the price or performance of something else, such as a stock, bond, commodity, or market index. For investors it acts like an insurance policy or a wager: it can be used to protect against losses, lock in prices, or amplify gains and losses, so it can change a portfolio’s risk and potential return without owning the underlying asset directly.
FAQ
What did Mirum Pharmaceuticals (MIRM) director Saira Ramasastry report in this Form 4?
Director Saira Ramasastry reported exercising 3,977 restricted stock units into common shares, then selling all 3,977 shares. The sale was conducted under a pre-arranged Rule 10b5-1 trading plan adopted on September 18, 2025.
What was the sequence of transactions reported by Saira Ramasastry for MIRM?
On May 29, 2026, 3,977 restricted stock units were converted into 3,977 common shares. On June 1, 2026, all 3,977 shares were sold in an open-market transaction under a Rule 10b5-1 trading plan.