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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
EC
1
EcoR1 Capital
California
$277M +$30.2M +1,607,640 +17%
BlackRock
2
BlackRock
New York
$90.2M -$1.92M -101,962 -3%
T. Rowe Price Associates
3
T. Rowe Price Associates
Maryland
$83.2M +$62M +3,297,931 +22,878%
Fidelity Investments
4
Fidelity Investments
Massachusetts
$78.3M +$30.7M +1,633,835 +110%
FLAM
5
First Light Asset Management
Minnesota
$73.7M +$16.5M +879,254 +43%
RG
6
Redmile Group
California
$46.6M +$34.9M +1,857,072 New
PAI
7
Palo Alto Investors
California
$43.8M +$954K +50,700 +3%
Dimensional Fund Advisors
8
Dimensional Fund Advisors
Texas
$39.8M -$2.99M -158,867 -9%
State Street
9
State Street
Massachusetts
$30.3M +$11.2M +594,142 +97%
RSCM
10
Rock Springs Capital Management
Maryland
$29.1M +$297K +15,800 +1%
PM
11
Prosight Management
Texas
$15.1M -$9.24M -491,202 -45%
Vanguard Group
12
Vanguard Group
Pennsylvania
$14.4M -$605K -32,135 -5%
Goldman Sachs
13
Goldman Sachs
New York
$12.5M +$854K +45,371 +10%
Geode Capital Management
14
Geode Capital Management
Massachusetts
$12.3M +$527K +27,994 +6%
IC
15
Ikarian Capital
Texas
$11M -$14.1M -749,270 -63%
N
16
Nuveen
North Carolina
$9.37M -$26.8K -1,423 -0.4%
UBS AM
17
UBS AM
Illinois
$8.86M +$5.95M +316,420 +876%
Two Sigma Advisers
18
Two Sigma Advisers
New York
$8.71M +$3.21M +170,600 +97%
Northern Trust
19
Northern Trust
Illinois
$8.57M -$543K -28,885 -8%
Jacobs Levy Equity Management
20
Jacobs Levy Equity Management
New Jersey
$7.88M -$36.5K -1,940 -0.6%
Two Sigma Investments
21
Two Sigma Investments
New York
$7.45M +$4.62M +245,797 +486%
Renaissance Technologies
22
Renaissance Technologies
New York
$7.26M -$470K -25,000 -8%
PA
23
Pinnacle Associates
New York
$7.02M -$554K -29,420 -10%
Invesco
24
Invesco
Georgia
$5.74M +$3.72M +197,641 +645%
Charles Schwab
25
Charles Schwab
California
$4.68M +$72.5K +3,852 +2%
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.