Latest filingSep 22, 2026Most recent Form 4
RNA
Atrium Therapeutics, Inc.
NasdaqHealthcarePharmaceutical Preparations
Insider activity for last month from 08/23 to 09/23. Counts use processed Form 4 rows. Purchase and sale metrics use codes P and S; totals remain unknown when any matching value is missing. Rows without a usable transaction date cannot be assigned to a rolling period and are excluded.
Total buying$00 buys
Total selling$00 sells
Net open-market+$08 insiders
Open-market mix
Buy vs sell distribution by transaction countInsider activity report
Monthly open-market purchase and sale counts Buys Sells
Transaction codes
By Form 4 transaction code in selected period8transactions
- F · Tax withholding · dominant8 · 100%
Activity by reported role
A joint filing can contribute to multiple roles8transactions
- CSO · dominant2 · 25%
- Director2 · 25%
- SR2 · 25%
- Chief financial officer1 · 13%
- CMO1 · 13%
Distinct insiders active
Reporting-owner CIKs by month · peak Sep 2026 (8)Aug 2026Sep 2026
Reported Holdings After
Separated by insider, security, and ownership typeHoyos Rocio MartinCommon Stock · Direct
38,340Sep 18, 2026
Winslow Brendan R.Common Stock · Direct
36,859Sep 18, 2026
Gallagher Kathleen P.Common Stock · Direct
119,729Sep 18, 2026
Kenney StephanieCommon Stock · Direct
33,085Sep 18, 2026
Boyce SarahCommon Stock · Direct
138,668Sep 18, 2026
Flanagan W. MichaelCommon Stock · Direct
31,974Sep 18, 2026
Hughes Steven GeorgeCommon Stock · Direct
51,638Sep 18, 2026
Younis HusamCommon Stock · Direct
41,441Sep 18, 2026
These are reported post-transaction holdings, not company-wide ownership percentages. Securities, indirect vehicles, and amendments are kept separate.
Filing activity heatmap
Each cell is one day · intensity = transactions · buys green, sells redAug 23 → Sep 23
LessMore
Top insiders
By absolute net value across the selected period- BS-$1.1M
- FM-$204.2k
- HG-$192.1k
- GP-$104.1k
- YH-$100.4k
Recent filing activity
Most recent 8 transactions · color = transaction codeFiling detail checks
Secondary metrics for the selected periodFiling-only signals
Deterministic matches in the selected period
No filing-only signal badges matched this period.
RNA transaction history
Filters apply within this company and selected period by defaultLatest insider transactions
Form 4 filings from last month. Click any column to sort; click it again to flip the order.
| ID | Ticker | Insider | Role | Type | Shares | Value | Code | Filed | Trans date |
|---|---|---|---|---|---|---|---|---|---|
| #227551 | RNA | Younis Husam | CSO | withholding | 11.2k | -$10.0M | F | 09/22 | 09/18 |
| #227549 | RNA | Hughes Steven George | CMO | withholding | 21.4k | -$19.2M | F | 09/22 | 09/18 |
| #227546 | RNA | Flanagan W. Michael | DIR | withholding | 22.8k | -$20.4M | F | 09/22 | 09/18 |
| #227544 | RNA | Boyce Sarah | DIR | withholding | 126k | -$113M | F | 09/22 | 09/18 |
| #227528 | RNA | Kenney Stephanie | SR | withholding | 2.37k | -$2.12M | F | 09/22 | 09/18 |
| #227516 | RNA | Gallagher Kathleen P. | SR | withholding | 11.6k | -$10.4M | F | 09/22 | 09/18 |
| #227514 | RNA | Winslow Brendan R. | CFO | withholding | 6.74k | -$6.03M | F | 09/22 | 09/18 |
| #227496 | RNA | Hoyos Rocio Martin | CSO | withholding | 8.32k | -$7.44M | F | 09/22 | 09/18 |
Atrium Therapeutics, Inc. Insider Activity FAQ
SEC Form 4 contextWho recently reported transactions at Atrium Therapeutics, Inc.?
Younis Husam, Hughes Steven George, Flanagan W. Michael, Boyce Sarah, Kenney Stephanie, Gallagher Kathleen P., Winslow Brendan R., Hoyos Rocio Martin.
When was the latest reported open-market purchase?
No code-P purchase is available for this period.
When was the latest reported open-market sale?
No code-S sale is available for this period.
What is the recent purchase and sale balance?
No code-P purchases or code-S sales were reported in the selected period.
Where can I see the original SEC filing?
Every transaction row and latest-activity fact links to its original SEC filing.
What do these Form 4 transaction codes mean?
P and S generally describe open-market or private purchases and sales. A, D, F, M, X, G, J, and V describe awards, issuer dispositions, tax withholding, exercises, gifts, other transactions, and voluntary early reports; review each filing and its footnotes for context.