AMERICAN CENTURY COMPANIES INC
Position in PRTA — Prothena Corp Public Ltd Co
CIK 748054
KANSAS CITY, MO
Position in PRTA
as of Jun 30, 2026
· filed Aug 12, 2026
Position Value
$887,404
+$113,391 QoQ
Shares Held
90,644
+13.8% QoQ
Ownership
0.177%
of shares outstanding
% of Portfolio
0.00%
of 13F equity value
Holder Rank
#47
of 187 holders
Holding Since
Dec 2022
9 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, 2026AMERICAN CENTURY COMPANIES INC holds $3,568,637,643 across 178 Biotechnology names. PRTA ranks #93 (0.0% of the industry book) .
| # | Ticker | Company | Shares | Value (USD) | Open |
|---|---|---|---|---|---|
| 1 | ALNY |
Alnylam Pharmaceuticals, Inc.
|
1,853,956 | $558,096,374 | |
| 2 | ASND |
Ascendis Pharma A/S
|
1,400,575 | $373,561,364 | |
| 3 | VRTX |
Vertex Pharmaceuticals Inc / Ma
|
580,901 | $288,550,953 | |
| 4 | ARGX |
Argenx SE
|
173,193 | $160,683,269 | |
| 5 | IONS |
Ionis Pharmaceuticals Inc
|
1,947,076 | $154,383,656 | |
| 6 | EXEL |
Exelixis, Inc.
|
1,791,664 | $97,484,438 | |
| 7 | HRMY |
Harmony Biosciences Holdings, Inc.
|
2,539,512 | $92,463,631 | |
| 8 | GPCR |
Structure Therapeutics Inc.
|
1,682,179 | $90,282,546 |
All Filings in PRTA
Export CSV
9 filing rows on record
| Report Date | Value (USD) | Shares | Type | Discretion | Filed | |
|---|---|---|---|---|---|---|
| 2026-06-30 | $887,404 | 90,644 | Shares | Defined | 2026-08-12 | |
| 2026-03-31 | $774,013 | 79,631 | Shares | Defined | 2026-05-15 | |
| 2025-12-31 | $752,578 | 78,804 | Shares | Defined | 2026-02-13 | |
| 2025-09-30 | $705,052 | 72,239 | Shares | Defined | 2025-11-12 | |
| 2025-06-30 | $363,987 | 59,965 | Shares | Defined | 2025-08-12 | |
| 2025-03-31 | $431,095 | 34,836 | Shares | Defined | 2025-05-13 | |
| 2024-12-31 | $421,026 | 30,399 | Shares | Defined | 2025-02-11 | |
| 2024-09-30 | $306,192 | 18,302 | Shares | Defined | 2024-11-12 | |
| 2022-12-31 | $251,061 | 4,167 | Shares | Defined | 2023-02-13 | |
| No filing history on record for this holder in this stock. | ||||||