Atrium Therapeutics, Inc. (RNA) Insider Trading
13 open-market trades reported since Jan 9, 2026: 0 purchases worth $0 and 13 sales worth $4.23M.
By insider
| Insider | Role | Buys | Bought | Sells | Sold |
|---|---|---|---|---|---|
| Sarah Boyce | CEO | 0 | $0 | 2 | $1.66M |
| W. Michael Flanagan | Chief Scientific Officer | 0 | $0 | 2 | $645K |
| Steven George Hughes | Chief Medical Officer | 0 | $0 | 2 | $526K |
| Michael F. Maclean | CFO | 0 | $0 | 2 | $472K |
| Teresa McCarthy | Chief Human Resources Officer | 0 | $0 | 2 | $354K |
| Arthur A. Levin | Director | 0 | $0 | 1 | $127K |
| Charles Calderaro III | Chief Technical Officer | 0 | $0 | 1 | $269K |
| John B. Moriarty | General Counsel | 0 | $0 | 1 | $171K |
All trades
| Filed | Insider | Type | Value | 3 mo. after |
|---|---|---|---|---|
| Jan 23 | Sarah BoyceCEO | ▼ SELL10b5-1 | $1.04M | |
| Jan 23 | W. Michael FlanaganChief Scientific Officer | ▼ SELL10b5-1 | $473K | |
| Jan 23 | Steven George HughesChief Medical Officer | ▼ SELL10b5-1 | $355K | |
| Jan 23 | Michael F. MacleanCFO | ▼ SELL10b5-1 | $329K | |
| Jan 23 | Teresa McCarthyChief Human Resources Officer | ▼ SELL10b5-1 | $212K | |
| Jan 23 | Arthur A. LevinDirector | ▼ SELL10b5-1 | $127K | |
| Jan 9 | Sarah BoyceCEO | ▼ SELL10b5-1 | $619K | |
| Jan 9 | Charles Calderaro IIIChief Technical Officer | ▼ SELL10b5-1 | $269K | |
| Jan 9 | John B. MoriartyGeneral Counsel | ▼ SELL10b5-1 | $171K | |
| Jan 9 | W. Michael FlanaganChief Scientific Officer | ▼ SELL10b5-1 | $171K | |
| Jan 9 | Steven George HughesChief Medical Officer | ▼ SELL10b5-1 | $171K | |
| Jan 9 | Michael F. MacleanCFO | ▼ SELL10b5-1 | $143K | |
| Jan 9 | Teresa McCarthyChief Human Resources Officer | ▼ SELL10b5-1 | $142K |
About this page
Insider trades reported on SEC Form 4: when the people who run a company buy or sell its shares with their own money.
How to read it
- Form 4
- The form a company insider (officer, director or owner of more than 10%) must file with the SEC within two business days of buying or selling the company's shares.
- Buy (P) and Sell (S)
- Open-market purchases and sales. Gifts, option exercises and automatic tax withholding are left out because they say little about what the insider thinks.
- Value
- Shares times price, as reported on the filing.
- 10b5-1
- A trade made under a plan set up in advance. Planned sales are common and usually say less than an unplanned purchase.
- Late filing
- A Form 4 filed more than two business days after the trade.
- Vs. S&P 500
- How the stock did after the trade minus how the overall market did in the same weeks.
A real example
In January 2016, when bank stocks were falling, JPMorgan Chase CEO Jamie Dimon bought 500,000 JPMorgan shares with his own money, worth about $26 million. His Form 4 made the purchase public within days, and investors read it as a strong sign of confidence.
Explain it like I'm 13
If the coach of a team bets his own allowance that his team will win, that tells you something. A Form 4 is the note a company boss must hand in whenever he buys or sells his own company's shares, so everyone can see it.
Data from public SEC filings and congressional reports. Information, not investment advice. Check every number against the filing linked on the page.