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Prothena Corp
PRTA

146 hedge funds and large institutions have $1B invested in Prothena Corp in 2021 Q1 according to their latest regulatory filings, with 22 funds opening new positions, 39 increasing their positions, 49 reducing their positions, and 13 closing their positions.

New
Increased
Maintained
Reduced
Closed

196% more call options, than puts

Call options by funds: $16.5M | Put options by funds: $5.57M

140% more capital invested

Capital invested by funds: $418M → $1B (+$586M)

69% more first-time investments, than exits

New positions opened: 22 | Existing positions closed: 13

4% more funds holding

Funds holding: 140 → 146 (+6)

3.6% more ownership

Funds ownership: 87.23% → 90.83% (+3.6%)

0% more funds holding in top 10

Funds holding in top 10: 3 → 3 (0)

20% less repeat investments, than reductions

Existing positions increased: 39 | Existing positions reduced: 49

Holders
146
Holders Change
+6
Holders Change %
+4.29%
% of All Funds
2.56%
Holding in Top 10
3
Holding in Top 10 Change
–
Holding in Top 10 Change %
–
% of All Funds
0.05%
New
22
Increased
39
Reduced
49
Closed
13
Calls
$16.5M
Puts
$5.57M
Net Calls
+$10.9M
Net Calls Change
+$8.89M

Top Buyers

1
T. Rowe Price Associates
T. Rowe Price Associates
Maryland
+$62M
2
RG
Redmile Group
California
+$34.9M
3
Fidelity Investments
Fidelity Investments
Massachusetts
+$30.7M
4
EC
EcoR1 Capital
California
+$30.2M
5
FLAM
First Light Asset Management
Minnesota
+$16.5M

Top Sellers

1
O
OrbiMed
New York
-$21.6M
2
IC
Ikarian Capital
Texas
-$14.1M
3
GPP
Great Point Partners
Connecticut
-$11.7M
4
Millennium Management
Millennium Management
New York
-$9.92M
5
PM
Prosight Management
Texas
-$9.24M
Name Holding Trade Value Shares
Change 		Change in
Stake
Axa
26
Axa
France
$4.22M -$147K -7,800 -4%
Bank of New York Mellon
27
Bank of New York Mellon
New York
$3.27M -$179K -9,522 -7%
PIM
28
Platinum Investment Management
Australia
$3.22M – – –
EGI
29
EAM Global Investors
California
$2.18M +$1.63M +86,860 New
TD Asset Management
30
TD Asset Management
Ontario, Canada
$1.98M +$1.48M +78,888 New
Massachusetts Financial Services
31
Massachusetts Financial Services
Massachusetts
$1.84M -$663K -35,255 -32%
Prudential Financial
32
Prudential Financial
New Jersey
$1.83M -$82.9K -4,404 -6%
AA
33
ALPS Advisors
Colorado
$1.81M +$1.49K +79 +0.1%
Hudson Bay Capital Management
34
Hudson Bay Capital Management
Connecticut
$1.76M +$1.32M +70,000 New
EP
35
Eversept Partners
New York
$1.72M -$2.54M -134,753 -66%
Acadian Asset Management
36
Acadian Asset Management
Massachusetts
$1.66M -$2.08M -110,396 -63%
Russell Investments Group
37
Russell Investments Group
United Kingdom
$1.63M -$518K -27,537 -30%
California Public Employees Retirement System
38
California Public Employees Retirement System
California
$1.57M -$111K -5,884 -9%
EI
39
EAM Investors
California
$1.55M +$1.16M +61,657 New
PPA
40
Parametric Portfolio Associates
Washington
$1.52M +$5.4K +287 +0.5%
D.E. Shaw & Co
41
D.E. Shaw & Co
New York
$1.49M -$2.9M -154,311 -72%
Swiss National Bank
42
Swiss National Bank
Switzerland
$1.49M +$26.3K +1,400 +2%
RhumbLine Advisers
43
RhumbLine Advisers
Massachusetts
$1.48M -$139K -7,370 -11%
Citadel Advisors
44
Citadel Advisors
Florida
$1.41M +$287K +15,239 +37%
Citigroup
45
Citigroup
New York
$1.38M +$894K +47,523 +628%
BFM
46
Boothbay Fund Management
New York
$1.21M -$1.45M -77,087 -62%
Bank of America
47
Bank of America
North Carolina
$1.2M +$619K +32,894 +219%
California State Teachers Retirement System (CalSTRS)
48
California State Teachers Retirement System (CalSTRS)
California
$1.17M – – –
AC
49
Apogem Capital
New York
$1.16M -$392K -20,825 -31%
DA
50
DCF Advisers
Connecticut
$1.15M +$863K +45,856 New
1
2
3 4 5

PRTA Hedge Fund Activity: Q1 2021 in Review

146 of the 5,695 institutional investors tracked by Wall St. Rank reported a position in Prothena Corp (PRTA) for Q1 2021, worth a combined $1B — up 140% from $418M a quarter earlier.

Buyers outnumbered sellers: 22 funds opened new PRTA positions and 13 closed out — a net gain of 9 holders — while 39 added to existing stakes and 49 trimmed.

The largest buyer was T. Rowe Price Associates, adding an estimated $62M. The largest seller was OrbiMed, exiting entirely with an estimated $21.6M sold.

  • 146 institutional investors held Prothena Corp (PRTA) as of Q1 2021, up from 140 in Q4 2020.
  • Funds reported $1B of Prothena Corp stock for Q1 2021, up 140% quarter-over-quarter.
  • 22 funds opened new Prothena Corp positions in Q1 2021 and 13 closed out, a net change of +9 holders.
  • The largest Prothena Corp buyer in Q1 2021 was T. Rowe Price Associates, an estimated $62M added.
  • The largest Prothena Corp seller in Q1 2021 was OrbiMed, an estimated $21.6M sold.

Based on aggregated 13F filings for Q1 2021.