T. Rowe Price Investment Management, Inc.
Position in ACLX — Arcellx, Inc.
CIK 1897612
BALTIMORE, MD
Position in ACLX
as of Mar 31, 2026
· filed May 15, 2026
Position Value
$259,019,911
-$429,519,799 QoQ
Shares Held
2,255,878
-78.6% QoQ
Ownership
3.86%
of shares outstanding
% of Portfolio
0.18%
of 13F equity value
Holder Rank
—
not a current holder
Holding Since
Sep 2023
11 quarters on record
Voting authority
Sole 94%
Shared 0%
None 6%
Common Shares in ACLX Over Time
Shares Held
Position Value (USD)
Position in Biotechnology
Healthcare · as of Mar 31, 2026T. Rowe Price Investment Management, Inc. holds $11,176,949,825 across 48 Biotechnology names. ACLX ranks #13 (2.3% of the industry book) .
| # | Ticker | Company | Shares | Value (USD) | Open |
|---|---|---|---|---|---|
| 1 | ALNY |
Alnylam Pharmaceuticals, Inc.
|
5,193,324 | $1,718,315,111 | |
| 2 | ASND |
Ascendis Pharma A/S
|
6,162,042 | $1,409,443,866 | |
| 3 | CYTK |
Cytokinetics Inc
|
17,523,840 | $1,154,996,294 | |
| 4 | APGE |
Apogee Therapeutics, Inc.
|
10,300,984 | $867,033,823 | |
| 5 | PCVX |
Vaxcyte, Inc.
|
12,126,017 | $704,642,847 | |
| 6 | DYN |
Dyne Therapeutics, Inc.
|
30,785,801 | $558,146,572 | |
| 7 | BNTX |
BioNTech SE
|
5,856,073 | $520,487,768 | |
| 8 | IONS |
Ionis Pharmaceuticals Inc
|
6,159,027 | $462,481,337 |
All Filings in ACLX
Export CSV
13 filing rows on record
| Report Date | Value (USD) | Shares | Type | Discretion | Filed | |
|---|---|---|---|---|---|---|
| 2026-03-31 | $259,019,911 | 2,255,878 | Shares | Sole | 2026-05-15 | |
| 2025-12-31 | $688,539,710 | 10,560,425 | Shares | Sole | 2026-02-19 | |
| 2025-11-30 | $698,352,938 | 9,604,634 | Shares | Sole | 2025-12-05 | |
| 2025-09-30 | $521,528,427 | 6,352,356 | Shares | Sole | 2025-11-14 | |
| 2025-08-31 | $435,485,186 | 6,275,907 | Shares | Sole | 2025-09-08 | |
| 2025-06-30 | $127,994,357 | 1,943,726 | Shares | Sole | 2025-08-14 | |
| 2025-03-31 | $109,233,052 | 1,665,138 | Shares | Sole | 2025-05-14 | |
| 2024-12-31 | $54,137,158 | 705,922 | Shares | Sole | 2025-02-14 | |
| 2024-09-30 | $78,886,719 | 944,638 | Shares | Sole | 2024-11-14 | |
| 2024-06-30 | $64,781,525 | 1,173,791 | Shares | Sole | 2024-08-14 | |
| 2024-03-31 | $68,358,052 | 982,862 | Shares | Sole | 2024-05-15 | |
| 2023-12-31 | $51,193,144 | 922,399 | Shares | Sole | 2024-02-14 | |
| 2023-09-30 | $32,657,186 | 910,178 | Shares | Sole | 2023-11-14 | |
| No filing history on record for this holder in this stock. | ||||||