T. Rowe Price Investment Management, Inc.
Position in IONS — Ionis Pharmaceuticals Inc
CIK 1897612
BALTIMORE, MD
Position in IONS
as of Mar 31, 2026
· filed May 15, 2026
Position Value
$462,481,337
-$258,054,046 QoQ
Shares Held
6,159,027
-32.4% QoQ
Ownership
3.73%
of shares outstanding
% of Portfolio
0.32%
of 13F equity value
Holder Rank
—
not a current holder
Holding Since
Sep 2022
15 quarters on record
Voting authority
Sole 99.70438512446852.ToString("F0")%
Shared 0.ToString("F0")%
None 0.295614875531476.ToString("F0")%
Common Shares in IONS 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. IONS ranks #8 (4.1% 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
This page
|
6,159,027 | $462,481,337 |
All Filings in IONS
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15 filing rows on record
| Report Date | Value (USD) | Shares | Type | Discretion | Filed | |
|---|---|---|---|---|---|---|
| 2026-03-31 | $462,481,337 | 6,159,027 | Shares | Sole | 2026-05-15 | |
| 2025-12-31 | $720,535,383 | 9,108,019 | Shares | Sole | 2026-02-19 | |
| 2025-09-30 | $860,726,295 | 13,156,929 | Shares | Sole | 2025-11-14 | |
| 2025-06-30 | $634,084,966 | 16,048,721 | Shares | Sole | 2025-08-14 | |
| 2025-03-31 | $488,015,830 | 16,175,533 | Shares | Sole | 2025-05-14 | |
| 2024-12-31 | $495,355,197 | 14,169,199 | Shares | Sole | 2025-02-14 | |
| 2024-09-30 | $567,574,726 | 14,168,116 | Shares | Sole | 2024-11-14 | |
| 2024-06-30 | $602,407,339 | 12,639,684 | Shares | Sole | 2024-08-14 | |
| 2024-03-31 | $577,296,805 | 13,317,112 | Shares | Sole | 2024-05-15 | |
| 2023-12-31 | $667,861,507 | 13,201,453 | Shares | Sole | 2024-02-14 | |
| 2023-09-30 | $595,261,774 | 13,123,055 | Shares | Sole | 2023-11-14 | |
| 2023-06-30 | $536,825,318 | 13,083,727 | Shares | Sole | 2023-08-14 | |
| 2023-03-31 | $466,909,039 | 13,064,047 | Shares | Sole | 2023-05-15 | |
| 2022-12-31 | $441,087,842 | 11,678,259 | Shares | Sole | 2023-02-14 | |
| 2022-09-30 | $493,460,619 | 11,156,695 | Shares | Sole | 2022-11-14 | |
| No filing history on record for this holder in this stock. | ||||||