MASSACHUSETTS FINANCIAL SERVICES CO /MA/
Position in PRTA — Prothena Corp Public Ltd Co
CIK 912938
Boston, MA
Position in PRTA
as of Jun 30, 2026
· filed Aug 3, 2026
Position Value
$1,243,231
-$40,303 QoQ
Shares Held
126,990
-3.8% QoQ
Ownership
0.247%
of shares outstanding
% of Portfolio
0.00%
of 13F equity value
Holder Rank
#43
of 187 holders
Holding Since
Sep 2020
14 quarters on record
Voting authority
Sole 83%
Shared 17%
None 0%
Common Shares in PRTA Over Time
Shares Held
Position Value (USD)
Position in Biotechnology
Healthcare · as of Jun 30, 2026MASSACHUSETTS FINANCIAL SERVICES CO /MA/ holds $2,249,676,327 across 65 Biotechnology names. PRTA ranks #35 (0.1% of the industry book) .
| # | Ticker | Company | Shares | Value (USD) | Open |
|---|---|---|---|---|---|
| 1 | ASND |
Ascendis Pharma A/S
|
1,875,301 | $500,180,281 | |
| 2 | RVMD |
Revolution Medicines, Inc.
|
2,012,317 | $376,866,725 | |
| 3 | VRTX |
Vertex Pharmaceuticals Inc / Ma
|
423,049 | $210,141,127 | |
| 4 | TECH |
BIO-TECHNE Corp
|
2,746,462 | $194,037,538 | |
| 5 | SRRK |
Scholar Rock Holding Corp
|
2,607,348 | $143,404,140 | |
| 6 | LGND |
Ligand Pharmaceuticals Inc
|
375,762 | $118,774,610 | |
| 7 | ALNY |
Alnylam Pharmaceuticals, Inc.
|
350,560 | $105,529,075 | |
| 8 | BNTX |
BioNTech SE
|
677,708 | $63,060,728 |
All Filings in PRTA
Export CSV
14 filing rows on record
| Report Date | Value (USD) | Shares | Type | Discretion | Filed | |
|---|---|---|---|---|---|---|
| 2026-06-30 | $1,243,231 | 126,990 | Shares | Defined | 2026-08-03 | |
| 2026-03-31 | $1,283,534 | 132,051 | Shares | Defined | 2026-05-14 | |
| 2025-12-31 | $439,013 | 45,970 | Shares | Sole | 2026-01-22 | |
| 2025-09-30 | $463,492 | 47,489 | Shares | Sole | 2025-10-29 | |
| 2025-06-30 | $269,289 | 44,364 | Shares | Sole | 2025-08-08 | |
| 2025-03-31 | $542,223 | 43,816 | Shares | Sole | 2025-05-02 | |
| 2024-12-31 | $620,687 | 44,815 | Shares | Sole | 2025-02-12 | |
| 2022-03-31 | $495,742 | 13,556 | Shares | Sole | 2022-05-11 | |
| 2021-12-31 | $2,067,785 | 41,858 | Shares | Sole | 2022-02-10 | |
| 2021-09-30 | $3,041,948 | 42,706 | Shares | Sole | 2021-11-10 | |
| 2021-06-30 | $2,224,407 | 43,268 | Shares | Sole | 2021-08-13 | |
| 2021-03-31 | $1,842,275 | 73,339 | Shares | Sole | 2021-05-13 | |
| 2020-12-31 | $1,304,213 | 108,594 | Shares | Sole | 2021-05-12 | |
| 2020-09-30 | $871,337 | 87,221 | Shares | Sole | 2020-11-12 | |
| No filing history on record for this holder in this stock. | ||||||