CHARLES SCHWAB INVESTMENT MANAGEMENT INC
Position in PRTA — Prothena Corp Public Ltd Co
CIK 884546
SAN FRANCISCO, CA
Position in PRTA
as of Jun 30, 2026
· filed Aug 14, 2026
Position Value
$3,484,221
+$17,438 QoQ
Shares Held
355,896
-0.2% QoQ
Ownership
0.693%
of shares outstanding
% of Portfolio
0.00%
of 13F equity value
Holder Rank
#26
of 187 holders
Holding Since
Mar 2020
26 quarters on record
Voting authority
Sole 100%
Shared 0%
None 0%
Common Shares in PRTA Over Time
Shares Held
Position Value (USD)
Position in Biotechnology
Healthcare · as of Jun 30, 2026CHARLES SCHWAB INVESTMENT MANAGEMENT INC holds $7,346,663,053 across 299 Biotechnology names. PRTA ranks #163 (0.0% of the industry book) .
| # | Ticker | Company | Shares | Value (USD) | Open |
|---|---|---|---|---|---|
| 1 | VRTX |
Vertex Pharmaceuticals Inc / Ma
|
2,041,282 | $1,013,966,007 | |
| 2 | REGN |
Regeneron Pharmaceuticals, Inc.
|
846,306 | $527,705,642 | |
| 3 | RVMD |
Revolution Medicines, Inc.
|
1,917,025 | $359,020,441 | |
| 4 | MRNA |
Moderna, Inc.
|
4,838,884 | $338,867,045 | |
| 5 | ALNY |
Alnylam Pharmaceuticals, Inc.
|
755,377 | $227,391,137 | |
| 6 | INCY |
Incyte Corp
|
1,692,439 | $191,854,884 | |
| 7 | RPRX |
Royalty Pharma plc
|
3,083,528 | $172,893,414 | |
| 8 | CYTK |
Cytokinetics Inc
|
1,565,781 | $133,388,883 |
All Filings in PRTA
Export CSV
26 filing rows on record
| Report Date | Value (USD) | Shares | Type | Discretion | Filed | |
|---|---|---|---|---|---|---|
| 2026-06-30 | $3,484,221 | 355,896 | Shares | Sole | 2026-08-14 | |
| 2026-03-31 | $3,466,783 | 356,665 | Shares | Sole | 2026-05-15 | |
| 2025-12-31 | $3,412,549 | 357,335 | Shares | Sole | 2026-02-13 | |
| 2025-09-30 | $3,424,012 | 350,821 | Shares | Sole | 2025-11-10 | |
| 2025-06-30 | $1,669,759 | 275,084 | Shares | Sole | 2025-08-12 | |
| 2025-03-31 | $3,955,136 | 319,607 | Shares | Sole | 2025-09-15 | |
| 2024-12-31 | $4,531,041 | 327,151 | Shares | Sole | 2025-02-06 | |
| 2024-09-30 | $5,436,614 | 324,962 | Shares | Sole | 2024-11-12 | |
| 2024-06-30 | $6,752,148 | 327,139 | Shares | Sole | 2024-08-12 | |
| 2024-03-31 | $7,899,276 | 318,905 | Shares | Sole | 2024-05-09 | |
| 2023-12-31 | $11,382,778 | 313,230 | Shares | Sole | 2024-02-06 | |
| 2023-09-30 | $14,886,910 | 308,537 | Shares | Sole | 2023-11-08 | |
| 2023-06-30 | $21,336,339 | 312,483 | Shares | Sole | 2023-08-10 | |
| 2023-03-31 | $14,491,124 | 298,971 | Shares | Sole | 2023-05-12 | |
| 2022-12-31 | $18,126,212 | 300,850 | Shares | Sole | 2023-02-13 | |
| 2022-09-30 | $17,324,537 | 285,742 | Shares | Sole | 2022-11-14 | |
| 2022-06-30 | $7,533,446 | 277,475 | Shares | Sole | 2022-08-15 | |
| 2022-03-31 | $10,400,581 | 284,402 | Shares | Sole | 2022-05-13 | |
| 2021-12-31 | $12,627,331 | 255,614 | Shares | Sole | 2022-02-11 | |
| 2021-09-30 | $17,217,359 | 241,715 | Shares | Sole | 2021-11-16 | |
| 2021-06-30 | $10,632,924 | 206,826 | Shares | Sole | 2021-08-16 | |
| 2021-03-31 | $4,682,141 | 186,391 | Shares | Sole | 2021-05-17 | |
| 2020-12-31 | $2,192,293 | 182,539 | Shares | Sole | 2021-02-16 | |
| 2020-09-30 | $1,827,780 | 182,961 | Shares | Sole | 2020-11-13 | |
| 2020-06-30 | $2,485,170 | 237,588 | Shares | Sole | 2020-08-20 | |
| 2020-03-31 | $2,593,744 | 242,406 | Shares | Sole | 2020-05-15 | |
| No filing history on record for this holder in this stock. | ||||||