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Equibles

CITADEL ADVISORS LLC

Position in PRTA — Prothena Corp Public Ltd Co

CIK 1423053 MIAMI, FL
Back to PRTA Full portfolio

Position in PRTA

as of Jun 30, 2026 · filed Aug 14, 2026
Position Value
$3,316,949
-$916,830 QoQ
Shares Held
338,810
-22.2% QoQ
Ownership
0.660%
of shares outstanding
% of Portfolio
0.00%
of 13F equity value
Holder Rank
#27
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)

Derivatives in PRTA

reported options exposure · as of Jun 30, 2026
CallValue
$1,144,451
CallShares
116,900
PutValue
$1,393,117
PutShares
142,300

Notional value of option positions as reported on Form 13F. Calls and puts are disclosed separately and do not net against the common-share stake above.

Position in Biotechnology

Healthcare · as of Jun 30, 2026

CITADEL ADVISORS LLC holds $6,088,855,369 across 436 Biotechnology names. PRTA ranks #170 (0.1% of the industry book) .

# Ticker Company Shares Value (USD) Open
1 ONC
BeOne Medicines Ltd.
 1,425,517 $406,229,578
2 BBIO
BridgeBio Pharma, Inc.
 3,760,028 $280,046,885
3 INSM
INSMED Inc
 2,556,973 $272,624,460
4 MDGL
Madrigal Pharmaceuticals, Inc.
 507,233 $272,358,759
5 VRTX
Vertex Pharmaceuticals Inc / Ma
 510,430 $253,545,893
6 JAZZ
Jazz Pharmaceuticals plc
 1,006,676 $242,578,715
7 MANE
Veradermics, Inc
 1,877,775 $230,853,658
8 ROIV
Roivant Sciences Ltd.
 5,576,261 $197,343,876

All Filings in PRTA

Export CSV
50 filing rows on record
Report Date Value (USD) Shares
2026-06-30 $1,393,117 142,300
2026-06-30 $1,144,451 116,900
2026-06-30 $3,316,949 338,810
2026-03-31 $4,233,779 435,574
2026-03-31 $484,056 49,800
2026-03-31 $849,528 87,400
2025-12-31 $602,605 63,100
2025-12-31 $8,713,247 912,382
2025-12-31 $962,640 100,800
2025-09-30 $1,274,656 130,600
2025-09-30 $722,240 74,000
2025-09-30 $7,486,943 767,105
2025-06-30 $6,966,065 1,147,622
2025-06-30 $385,445 63,500
2025-06-30 $965,737 159,100
2025-03-31 $1,106,312 89,399
2025-03-31 $300,712 24,300
2025-03-31 $356,400 28,800
2024-12-31 $575,024 41,518
2024-12-31 $465,360 33,600
2024-12-31 $1,483,335 107,100
2024-09-30 $349,657 20,900
2024-09-30 $3,976,435 237,683
2024-09-30 $532,014 31,800
2024-06-30 $7,289,077 353,153
2024-06-30 $344,688 16,700
2024-06-30 $555,216 26,900
2024-03-31 $5,819,116 234,926
2024-03-31 $594,480 24,000
2024-03-31 $564,756 22,800
2023-12-31 $5,036,251 138,587
2023-12-31 $4,506,160 124,000
2023-12-31 $1,239,194 34,100
2023-09-30 $1,457,150 30,200
2023-09-30 $7,186,113 148,935
2023-09-30 $559,700 11,600
2023-06-30 $1,395,779 20,442
2023-06-30 $1,194,900 17,500
2023-06-30 $1,666,032 24,400
2023-03-31 $911,236 18,800
2023-03-31 $300,514 6,200
2023-03-31 $1,827,367 37,701
2022-12-31 $783,250 13,000
2022-12-31 $15,002 249
2022-12-31 $1,644,825 27,300
2022-09-30 $7,433,238 122,600
2022-09-30 $11,437,425 188,643
2022-09-30 $2,358,507 38,900
2022-06-30 $4,222,122 155,511
2022-06-30 $1,229,895 45,300

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