SEC Form 4 reporting owner

Flanagan W. Michael

Flanagan W. Michael has filed 13 Form 4 transactions reported between December 17, 2025 and September 18, 2026, as a reporting owner of Atrium Therapeutics, Inc. and Chief Scientific Officer of Avidity Biosciences, Inc..

Name as filed: Flanagan W. Michael

Open-market buys, 24 mo

None

reported

Open-market sales, 24 mo

$645K

3 lines

Companies

with Form 4 filings

Latest transaction

Sep 18, 2026

transaction date

Roles and reported holdings

RNAAtrium Therapeutics, Inc.
Sep 18, 2026
Reporting owner
Held directly31,974 sh as of Sep 18, 2026 · Form 4
RNAAvidity Biosciences, Inc.
Dec 17, 2025 – Feb 27, 2026
Chief Scientific Officer
Held directly85,093 sh as of Jan 21, 2026 · Form 4
24 months: $645K sold

Transaction history

All 13 reported transactions, newest first. Every row links to the Form 4 on SEC EDGAR.

Date	Company	Type	Shares	Price	Value	Owned after	Filing
Sep 18, 2026	RNA	Shares withheld for tax or exercise priceCode F · direct	22,812	$8.95	$204K@ $8.95	31,974	Form 4
Feb 27, 2026	RNAChief Scientific Officer	Disposition to issuerCode D · direct	50,000	—	—	0	Form 4
Feb 27, 2026	RNAChief Scientific Officer	Disposition to issuerCode D · direct	88,000	—	—	0	Form 4
Feb 27, 2026	RNAChief Scientific Officer	Disposition to issuerCode D · direct	72,000	—	—	0	Form 4
Feb 27, 2026	RNAChief Scientific Officer	Disposition to issuerCode D · direct	96,000	—	—	0	Form 4
Feb 27, 2026	RNAChief Scientific Officer	Disposition to issuerCode D · direct	66,500	—	—	0	Form 4
Feb 27, 2026	RNAChief Scientific Officer	Disposition to issuerCode D · direct	25,000	—	—	0	Form 4
Feb 27, 2026	RNAChief Scientific Officer	Disposition to issuerCode D · direct	150,365	—	—	0	Form 4
Jan 21, 2026	RNAChief Scientific Officer	Open-market saleCode S · direct	2,558	$72.45	$185K@ $72.45	85,093	Form 4
Jan 21, 2026	RNAChief Scientific Officer	Open-market saleCode S · direct	3,976	$72.45	$288K@ $72.45	87,651	Form 4
Jan 7, 2026	RNAChief Scientific Officer	Open-market saleCode S · directAlso reported by Hughes Steven George	2,373	$72.23	$171K@ $72.23	91,627	Form 4
Dec 17, 2025	RNAChief Scientific Officer	Shares withheld for tax or exercise priceCode F · direct	13,695	$71.87	$984K@ $71.87	94,000	Form 4
Dec 17, 2025	RNAChief Scientific Officer	Grant or awardCode A · direct	27,500	—	—	107,695	Form 4

How this page is built

Every row comes from a Form 4 filed with the SEC, which officers, directors and holders of more than 10% of a company’s stock must file within two business days of a trade. Transactions are grouped by the reporting owner’s name as filed (spacing, capitals and punctuation ignored); two different people filing under an identical name would appear together, and one person filing under two spellings appears on two pages.

Open-market totals count code P purchases and code S sales over the last 24 months. The same trade reported on more than one filing is counted once; when another owner (for example a fund and its general partner) reports the identical trade, they are listed beside it. Holdings are the shares owned after the latest purchase, sale, gift or tax-withholding line, shown separately for direct and indirect ownership; an indirect figure is one holding line, not a total across every trust or entity.

This page describes what was filed with the SEC; it is not investment advice or a recommendation to buy or sell any security.