Westchester Capital Management, LLC
Position in RNA — Atrium Therapeutics, Inc.
CIK 1512805
VALHALLA, NY
Position in RNA
as of Mar 31, 2026
· filed May 15, 2026
Position Value
$738,504
New position
Shares Held
55,236
first reported quarter
Ownership
0.323%
of shares outstanding
% of Portfolio
0.04%
of 13F equity value
Holder Rank
—
not a current holder
Holding Since
Mar 2026
1 quarter on record
Voting authority
Sole 10%
Shared 90%
None 0%
Position in Biotechnology
Healthcare · as of Mar 31, 2026Westchester Capital Management, LLC holds $9,890,386 across 2 Biotechnology names. RNA ranks #2 (7.5% of the industry book) .
| # | Ticker | Company | Shares | Value (USD) | Open |
|---|---|---|---|---|---|
| 1 | APLS |
Apellis Pharmaceuticals, Inc.
|
227,489 | $9,151,882 | |
| 2 | RNA |
Atrium Therapeutics, Inc.
This page
|
55,236 | $738,504 |
All Filings in RNA
Export CSV
1 filing row on record
| Report Date | Value (USD) | Shares | Type | Discretion | Filed | |
|---|---|---|---|---|---|---|
| 2026-03-31 | $738,504 | 55,236 | Shares | Other | 2026-05-15 | |
| No filing history on record for this holder in this stock. | ||||||