CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM
PensionPosition in PRTA — Prothena Corp Public Ltd Co
CIK 1081019
WEST SACRAMENTO, CA
Position in PRTA
as of Mar 31, 2026
· filed May 18, 2026
Position Value
$23,162
-$2,718 QoQ
Shares Held
2,383
-12.1% QoQ
Ownership
0.005%
of shares outstanding
% of Portfolio
0.00%
of 13F equity value
Holder Rank
—
not a current holder
Holding Since
Mar 2020
25 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 Mar 31, 2026CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM holds $855,427,423 across 222 Biotechnology names. PRTA ranks #152 (0.0% of the industry book) .
| # | Ticker | Company | Shares | Value (USD) | Open |
|---|---|---|---|---|---|
| 1 | VRTX |
Vertex Pharmaceuticals Inc / Ma
|
373,481 | $166,774,205 | |
| 2 | REGN |
Regeneron Pharmaceuticals, Inc.
|
154,201 | $119,141,860 | |
| 3 | ALNY |
Alnylam Pharmaceuticals, Inc.
|
196,863 | $65,136,060 | |
| 4 | INSM |
INSMED Inc
|
303,182 | $49,576,320 | |
| 5 | RPRX |
Royalty Pharma plc
|
759,042 | $36,411,244 | |
| 6 | INCY |
Incyte Corp
|
241,287 | $22,709,932 | |
| 7 | MRNA |
Moderna, Inc.
|
407,190 | $20,685,252 | |
| 8 | RVMD |
Revolution Medicines, Inc.
|
165,277 | $16,073,188 |
All Filings in PRTA
Export CSV
25 filing rows on record
| Report Date | Value (USD) | Shares | Type | Discretion | Filed | |
|---|---|---|---|---|---|---|
| 2026-03-31 | $23,162 | 2,383 | Shares | Sole | 2026-05-18 | |
| 2025-12-31 | $25,880 | 2,710 | Shares | Sole | 2026-02-17 | |
| 2025-09-30 | $23,570 | 2,415 | Shares | Sole | 2025-11-14 | |
| 2025-06-30 | $201,785 | 33,243 | Shares | Sole | 2025-08-14 | |
| 2025-03-31 | $411,382 | 33,243 | Shares | Sole | 2025-05-15 | |
| 2024-12-31 | $460,415 | 33,243 | Shares | Sole | 2025-03-18 | |
| 2024-09-30 | $561,492 | 33,562 | Shares | Sole | 2025-04-04 | |
| 2024-06-30 | $717,611 | 34,768 | Shares | Sole | 2025-04-08 | |
| 2024-03-31 | $1,001,748 | 40,442 | Shares | Sole | 2024-05-16 | |
| 2023-12-31 | $1,552,081 | 42,710 | Shares | Sole | 2024-02-13 | |
| 2023-09-30 | $2,129,369 | 44,132 | Shares | Sole | 2023-11-14 | |
| 2023-06-30 | $3,311,853 | 48,504 | Shares | Sole | 2023-08-21 | |
| 2023-03-31 | $2,147,608 | 44,308 | Shares | Sole | 2023-05-09 | |
| 2022-12-31 | $2,604,005 | 43,220 | Shares | Sole | 2023-02-14 | |
| 2022-09-30 | $2,558,767 | 42,203 | Shares | Sole | 2022-11-21 | |
| 2022-06-30 | $1,172,092 | 43,171 | Shares | Sole | 2022-08-15 | |
| 2022-03-31 | $1,581,103 | 43,235 | Shares | Sole | 2022-05-16 | |
| 2021-12-31 | $2,293,740 | 46,432 | Shares | Sole | 2022-02-15 | |
| 2021-09-30 | $3,147,724 | 44,191 | Shares | Sole | 2021-11-15 | |
| 2021-06-30 | $2,417,401 | 47,022 | Shares | Sole | 2021-08-16 | |
| 2021-03-31 | $1,165,216 | 46,386 | Shares | Sole | 2021-05-18 | |
| 2020-12-31 | $557,095 | 46,386 | Shares | Sole | 2021-02-16 | |
| 2020-09-30 | $463,396 | 46,386 | Shares | Sole | 2020-11-17 | |
| 2020-06-30 | $485,197 | 46,386 | Shares | Sole | 2020-08-17 | |
| 2020-03-31 | $649,693 | 60,719 | Shares | Sole | 2020-05-13 | |
| No filing history on record for this holder in this stock. | ||||||