Security Snapshot

PROTHENA CORP PUBLIC LTD CO - Ordinary Shares, $0.01 par value (PRTA) Institutional Ownership

CUSIP: G72800108

13F Institutional Holders and Ownership History from Q1 2014 to Q3 2026

13F reference period

Q2 2026

Institutions Reporting

187

Shares (Excl. Options)

47.26MFull value: 47,259,753 · shares · 30 Jun 2026

Price

$9.79

The headline uses the Q2 2026 reference period after its reporting deadline. Available reports may still be incomplete or amended. Newer periods in the history table contain incoming reports and may be incomplete.

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Security type / class
Equity / Ordinary Shares, $0.01 par value
Symbol
PRTA on Nasdaq
All holders as of 30 Jun 2026
Q2 2026
Total 13F shares
47,259,753
Latest holder snapshot 5 signals
Total 13F value
$462,653,726
Portfolio coverage rank
0%
Share change
+112,855
Value change
+$1,238,591
Number of holders
187
Issuer context Names, identifiers, and filing context for this profile. 3 identity fields
Shares outstanding
51,459,275
SEC-reported price per share
$8.38
Insider filing price
$8.38
13F Shares, Excluding Options vs Price
13F Value, Excluding Options
Total Investors
Filing notes and source

Key facts

  • PRTA - PROTHENA CORP PUBLIC LTD CO - Ordinary Shares, $0.01 par value is tracked under CUSIP G72800108.
  • 187 institutions reported positions in Q2 2026.
  • 8 significant owners is listed from Schedule 13D/13G reporting.

Change

  • Holder count moved from 186 to 187 between Q1 2026 and Q2 2026.
  • SEC-reported value moved from
    $459.53MFull value: $459,532,437 · USD · 31 Mar 2026
    to
    $462.65MFull value: $462,653,726 · USD · 30 Jun 2026
    .

Research use

  • You can quickly see who holds this security, then open quarter and manager detail pages for full evidence.
  • 13F and Schedule 13D/13G sections are kept together so you can cross-check institutional and beneficial ownership context.

Evidence

Source: SEC Form 13F

Latest holder context comes from 187 institutions filings for Q2 2026.

Open SEC evidence

Security key

G72800108

13F reference period

Q2 2026

13F holders

187

13D/G owners

8

CIK / CUSIP context first

Open Q2 2026 holders PRTA full holder history PROTHENA CORP PUBLIC LTD CO SEC filings PROTHENA CORP PUBLIC LTD CO company facts PROTHENA CORP PUBLIC LTD CO insider transactions

Broader feeds

Latest 13F filings Latest 13D/G filings All securities

13D/G owners

Significant owners

Large-stake holder rows connected to Schedule 13D/G evidence.

Rows
8
Security
PRTA
Filer Ownership Change % Holdings Value Net Change Nb Shares Change % Reporting Name Report Period
FMR LLC 14% $66,520,774 7,199,218 FMR LLC 30 Jun 2026
SCULLY WILLIAM P 10% +5% $53,949,825 +$972,910 5,378,846 +1.8% SCULLY WILLIAM P 07 May 2026
Fennell Todd W. 10% +4% $44,930,122 +$2,037,280 5,248,846 +4.7% Fennell Todd W. 18 Aug 2026
Rubric Capital Management LP 9.3% +35% $50,150,000 +$13,266,370 5,000,000 +36% Rubric Capital Management LP 31 Mar 2026
BlackRock, Inc. 6.9% +20% $35,121,429 +$4,848,194 3,587,480 +16% BlackRock, Inc. 30 Jun 2026
ADAR1 Capital Management, LLC 2.7% -60% $14,338,396 -$18,601,691 1,469,098 -56% ADAR1 Capital Management, LLC 30 Sep 2025
WELLINGTON MANAGEMENT GROUP LLP 0.2% -93% $821,299 -$38,122,050 108,208 -98% Wellington Management Group LLP 30 May 2025
PRICE T ROWE ASSOCIATES INC /MD/ 0.1% $449,017 71,047 T. Rowe Price Associates, Inc. 30 Jun 2025
As of 30 Jun 2026, 187 institutional investors reported holding
47.26MFull value: 47,259,753 · shares · 30 Jun 2026
shares of PROTHENA CORP PUBLIC LTD CO - Ordinary Shares, $0.01 par value (PRTA). This represents 92% of the company’s total
51.46MFull value: 51,459,275 · shares · Stored outstanding share count
outstanding shares.

13F concentration

Top 25 institutional shareholders

Largest 13F positions for this security by reported shares and value.

Top holder share
78%
Institution Ownership % Shares Held Share Change % Portfolio % Holdings Value
FMR LLC 14% 7,199,218 -4.7% 0% $70,480,344
Rubric Capital Management LP 9.7% 5,000,000 0% 0.45% $48,950,000
BlackRock, Inc. 9.5% 4,867,955 +4.8% 0% $47,657,280
STATE STREET CORP 4.7% 2,393,424 +23% 0% $23,431,621
ACADIAN ASSET MANAGEMENT LLC 3.9% 2,010,645 +30% 0.02% $19,677,000
VANGUARD PORTFOLIO MANAGEMENT LLC 3.2% 1,651,293 +14% 0% $16,166,158
D. E. Shaw & Co., Inc. 3.1% 1,611,457 -8.6% 0.01% $15,776,164
ADAR1 Capital Management, LLC 3% 1,554,535 -1.7% 0.72% $15,218,898
TWO SIGMA INVESTMENTS, LP 2.5% 1,264,987 +4.9% 0.01% $12,384,223
Palo Alto Investors LP 2.2% 1,143,155 -5.4% 1.5% $11,191,487
GEODE CAPITAL MANAGEMENT, LLC 2.2% 1,125,877 +2.5% 0% $11,024,980
FEDERATED HERMES, INC. 2.1% 1,084,401 +2.3% 0.02% $10,616,286
MORGAN STANLEY 1.9% 995,348 -19% 0% $9,744,465
GOLDMAN SACHS GROUP INC 1.9% 979,730 +20% 0% $9,591,557
JACOBS LEVY EQUITY MANAGEMENT, INC 1.9% 965,988 -0.62% 0.03% $9,457,023
DIMENSIONAL FUND ADVISORS LP 1.8% 905,651 +16% 0% $8,867,349
Qube Research & Technologies Ltd 1.5% 791,169 +29% 0.01% $7,745,545
RENAISSANCE TECHNOLOGIES LLC 1.4% 697,615 +15% 0.01% $6,829,651
Man Group plc 1.3% 678,116 +78% 0.01% $6,638,756
Mariner, LLC 1.2% 625,095 +11% 0.01% $6,119,684
Nuveen, LLC 1.1% 557,157 -27% 0% $5,454,568
VANGUARD CAPITAL MANAGEMENT LLC 0.93% 479,945 -0.86% 0% $4,698,662
NORTHERN TRUST CORP 0.89% 457,124 +24% 0% $4,475,243
Birchview Capital, LP 0.87% 449,019 0% 2.1% $4,395,896
Rangeley Capital, LLC 0.81% 417,270 -7.2% 4% $4,085,073

Quarter history

Institutional holders across reporting periods

Holder count, reported shares/value, and median price by quarter.

Periods
51
Headline period
Q2 2026
Rows shown
1-25 of 51
Period 13F Shares, Excl. Options Value, Excl. Options Value Change Price (Median) Investors
2026 Q3 531,045 $4,452,668 -$483,523 $8.38 27
2026 Q2 47,259,753 $462,653,726 +$1,238,591 $9.79 187
2026 Q1 47,280,954 $459,532,437 +$45,325 $9.72 186
2025 Q4 47,239,615 $451,176,561 +$43,863,231 $9.55 181
2025 Q3 42,604,772 $415,804,752 +$14,066,211 $9.76 186
2025 Q2 41,776,362 $253,618,091 -$154,368,994 $6.07 189
2025 Q1 52,255,320 $646,537,943 -$15,376,892 $12.38 159
2024 Q4 53,520,384 $741,301,350 +$19,669,947 $13.85 169
2024 Q3 50,853,296 $851,220,146 -$23,732,004 $16.73 161
2024 Q2 50,815,366 $1,048,817,908 -$59,472,211 $20.64 158
2024 Q1 53,460,655 $1,324,229,375 -$21,764,361 $24.77 167
2023 Q4 53,582,486 $1,947,737,140 -$9,488,527 $36.34 185
2023 Q3 52,971,709 $2,555,148,423 +$29,971,909 $48.25 183
2023 Q2 51,720,763 $3,531,607,158 +$12,834,911 $68.28 193
2023 Q1 51,855,543 $2,513,406,409 +$112,382,536 $48.47 190
2022 Q4 49,429,867 $2,978,072,979 +$298,095,364 $60.25 200
2022 Q3 44,446,558 $2,694,628,592 -$49,390,014 $60.63 172
2022 Q2 44,544,535 $1,209,363,430 +$9,495,997 $27.15 148
2022 Q1 44,090,735 $1,613,250,005 +$36,002,082 $36.57 157
2021 Q4 42,838,679 $2,116,102,912 +$71,220,544 $49.40 178
2021 Q3 40,926,820 $2,915,195,629 +$43,595,404 $71.23 178
2021 Q2 40,413,096 $2,077,425,322 +$59,094,190 $51.41 145
2021 Q1 39,992,237 $1,004,673,605 +$172,031,286 $25.12 136
2020 Q4 34,820,788 $418,200,137 -$14,386,569 $12.01 125
2020 Q3 36,213,293 $361,767,623 -$14,703,289 $9.99 122
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