SG Americas Securities, LLC
Broker-DealerPosition in PRTA — Prothena Corp Public Ltd Co
CIK 1313360
NEW YORK, NY
Position in PRTA
as of Mar 31, 2026
· filed Apr 16, 2026
Position Value
$131,433
-$470,388 QoQ
Shares Held
13,522
-78.5% QoQ
Ownership
0.026%
of shares outstanding
% of Portfolio
0.00%
of 13F equity value
Holder Rank
—
not a current holder
Holding Since
Mar 2020
24 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, 2026SG Americas Securities, LLC holds $1,085,838,933 across 181 Biotechnology names.
| # | Ticker | Company | Shares | Value (USD) | Open |
|---|---|---|---|---|---|
| 1 | REGN |
Regeneron Pharmaceuticals, Inc.
|
427,703 | $266,689,928 | |
| 2 | VRTX |
Vertex Pharmaceuticals Inc / Ma
|
523,720 | $260,147,435 | |
| 3 | URGN |
UroGen Pharma Ltd.
|
2,052,906 | $75,546,940 | |
| 4 | CGON |
CG Oncology, Inc.
|
867,465 | $61,633,388 | |
| 5 | PTCT |
Ptc Therapeutics, Inc.
|
605,581 | $49,397,242 | |
| 6 | ASND |
Ascendis Pharma A/S
|
161,026 | $42,948,854 | |
| 7 | RPRX |
Royalty Pharma plc
|
688,590 | $38,609,241 | |
| 8 | BNTX |
BioNTech SE
|
347,131 | $32,300,539 |
All Filings in PRTA
Export CSV
24 filing rows on record
| Report Date | Value (USD) | Shares | Type | Discretion | Filed | |
|---|---|---|---|---|---|---|
| 2026-03-31 | $131,433 | 13,522 | Shares | Sole | 2026-04-16 | |
| 2025-12-31 | $601,821 | 63,018 | Shares | Sole | 2026-01-09 | |
| 2025-09-30 | $553,577 | 56,719 | Shares | Sole | 2025-10-23 | |
| 2025-06-30 | $315,281 | 51,941 | Shares | Sole | 2025-08-08 | |
| 2025-03-31 | $897,917 | 72,559 | Shares | Sole | 2025-04-15 | |
| 2024-12-31 | $520,926 | 37,612 | Shares | Sole | 2025-01-17 | |
| 2024-09-30 | $235,675 | 14,087 | Shares | Sole | 2024-10-03 | |
| 2024-06-30 | $1,126,366 | 54,572 | Shares | Sole | 2024-07-12 | |
| 2024-03-31 | $414,154 | 16,720 | Shares | Sole | 2024-05-06 | |
| 2023-12-31 | $4,937,043 | 135,857 | Shares | Sole | 2024-01-12 | |
| 2023-09-30 | $4,462,835 | 92,494 | Shares | Sole | 2023-10-13 | |
| 2023-06-30 | $242,735 | 3,555 | Shares | Sole | 2023-07-10 | |
| 2023-03-31 | $5,302,666 | 109,401 | Shares | Sole | 2023-04-28 | |
| 2022-12-31 | $4,746,013 | 78,772 | Shares | Sole | 2023-02-02 | |
| 2022-09-30 | $8,220,700 | 135,588 | Shares | Sole | 2022-10-31 | |
| 2022-06-30 | $4,197,064 | 154,588 | Shares | Sole | 2022-07-29 | |
| 2022-03-31 | $5,248,014 | 143,506 | Shares | Sole | 2022-04-29 | |
| 2021-12-31 | $7,649,244 | 154,843 | Shares | Sole | 2022-02-07 | |
| 2021-09-30 | $8,268,093 | 116,076 | Shares | Sole | 2021-11-01 | |
| 2021-06-30 | $515,128 | 10,020 | Shares | Sole | 2021-08-12 | |
| 2021-03-31 | $264,764 | 10,540 | Shares | Sole | 2021-05-13 | |
| 2020-12-31 | $160,681 | 13,379 | Shares | Sole | 2021-02-04 | |
| 2020-06-30 | $127,381 | 12,178 | Shares | Sole | 2020-07-20 | |
| 2020-03-31 | $176,903 | 16,533 | Shares | Sole | 2020-04-30 | |
| No filing history on record for this holder in this stock. | ||||||