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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
RC
51
RBF Capital
California
$1.14M – – –
AllianceBernstein
52
AllianceBernstein
Tennessee
$1.08M -$137K -7,300 -15%
State of Wisconsin Investment Board
53
State of Wisconsin Investment Board
Wisconsin
$1.04M -$30.1K -1,600 -4%
Rafferty Asset Management
54
Rafferty Asset Management
New York
$1.03M +$773K +41,078 New
Los Angeles Capital Management
55
Los Angeles Capital Management
California
$984K -$7.53K -400 -1%
MWNA
56
Marshall Wace North America
New York
$769K +$348K +18,497 +153%
Barclays
57
Barclays
United Kingdom
$740K +$231K +12,288 +71%
CAM
58
ClariVest Asset Management
California
$722K +$540K +28,700 +68,333%
SFI
59
Susquehanna Fundamental Investments
Pennsylvania
$720K +$300K +15,920 +125%
New York State Common Retirement Fund
60
New York State Common Retirement Fund
New York
$698K – – –
Principal Financial Group
61
Principal Financial Group
Iowa
$679K +$38.9K +2,067 +8%
Edgewood Management
62
Edgewood Management
Connecticut
$628K – – –
UBS Group
63
UBS Group
Switzerland
$605K +$291K +15,463 +179%
Walleye Trading
64
Walleye Trading
New York
$593K -$344K -18,308 -44%
VEA
65
Virtus ETF Advisers
New York
$593K +$7.96K +423 +2%
Marshall Wace
66
Marshall Wace
United Kingdom
$591K -$744K -39,520 -63%
Millennium Management
67
Millennium Management
New York
$577K -$9.92M -527,314 -96%
Wells Fargo
68
Wells Fargo
California
$576K -$466K -24,764 -52%
SM
69
SG3 Management
Puerto Rico
$565K +$329K +17,500 +350%
CM
70
Caption Management
Oklahoma
$528K +$395K +21,000 New
Wellington Management Group
71
Wellington Management Group
Massachusetts
$517K -$3.84M -204,144 -91%
Deutsche Bank
72
Deutsche Bank
Germany
$503K -$139K -7,363 -27%
CS
73
Credit Suisse
Switzerland
$488K -$309K -16,428 -46%
ACM
74
Atika Capital Management
New York
$450K +$337K +17,906 New
Ameriprise
75
Ameriprise
Minnesota
$447K -$438K -23,277 -57%
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.