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Rock Springs Capital Management Portfolio holdings

AUM $1.7B
1-Year Est. Return 93.03%
This Fund
S&P 500
This Quarter Est. Return
-0.68%
1 Year Est. Return
+93.03%
3 Year Est. Return
+228.43%
5 Year Est. Return
+368.14%
10 Year Est. Return
+4,607.77%
AUM
$4.76B
AUM Growth
-$304M
Cap. Flow
+$23.1M
Cap. Flow %
0.49%
Top 10 Hldgs %
26.26%
Holding
167
New
11
Increased
69
Reduced
16
Closed
14

Top Buys

Rank Stock Value
1
BAX icon
Baxter International
BAX
+$35.6M
2
WRBY icon
Warby Parker
WRBY
+$35M
3
RARE icon
Ultragenyx Pharmaceutical
RARE
+$30.4M
4
IMRX icon
Immuneering
IMRX
+$29.3M
5
ABOS icon
Acumen Pharmaceuticals
ABOS
+$26.3M

Top Sells

Rank Stock Value
1
ONC
BeOne Medicines Ltd
ONC
+$68.6M
2
ARDX icon
Ardelyx
ARDX
+$39.8M
3
BIIB icon
Biogen
BIIB
+$39.3M
4
BSX icon
Boston Scientific
BSX
+$34.2M
5
PPD
PPD, Inc. Common Stock
PPD
+$31.1M

Sector Composition

Rank Sector Weight
1 Healthcare 93.24%
2 Consumer Staples 1.58%
3 Industrials 0.82%
4 Financials 0.4%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
BSX icon
151
Boston Scientific
BSX
$73.1B
– –
-800,000
Closed -$34.2M
KYNB
152
Kyntra Bio
KYNB
$28.2M
– –
-12,507
Closed -$8.33M
LKFT
153
Lakefront Biotherapeutics American Depositary Shares
LKFT
$1.76B
– –
-165,000
Closed -$11.4M
TARA icon
154
Protara Therapeutics
TARA
$231M
– –
-693,542
Closed -$6.75M
ONC
155
BeOne Medicines Ltd
ONC
$40.6B
– –
-200,000
Closed -$68.6M
PPD
156
DELISTED
PPD, Inc. Common Stock
PPD
– –
-675,000
Closed -$31.1M
TBIO
157
DELISTED
Translate Bio, Inc. Common Stock
TBIO
– –
-693,266
Closed -$19.1M
CHMA
158
DELISTED
Chiasma, Inc. Common Stock
CHMA
– –
-3,258,144
Closed -$15.4M
CNST
159
DELISTED
Constellation Pharmaceuticals, Inc.
CNST
– –
-247,200
Closed -$8.36M
3 4 5 6
7

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Rock Springs Capital Management's Q3 2021 Portfolio in Review

As of Q3 2021, Rock Springs Capital Management held 167 positions worth $4.76B, down 6% from $5.06B the previous quarter. Its ten largest holdings account for 26% of the portfolio.

Rock Springs Capital Management's Q3 2021 filing shows 11 new, 69 increased, 16 reduced and 14 closed positions. Its largest new stake was Baxter International: 450,000 shares worth $36.2M. The largest sale was BeOne Medicines Ltd, an estimated $68.6M.

By sector, the portfolio is most concentrated in Healthcare at 93% of assets, down from 94% a quarter earlier, followed by Consumer Staples and Industrials.

  • Rock Springs Capital Management's largest Q3 2021 buy was Baxter International: 450,000 shares worth $36.2M.
  • Rock Springs Capital Management added most to Ultragenyx Pharmaceutical in Q3 2021, an estimated $30.4M increase.
  • Rock Springs Capital Management's biggest Q3 2021 reduction was Prothena Corp, cutting an estimated $14.9M.
  • Rock Springs Capital Management fully exited BeOne Medicines Ltd in Q3 2021, selling an estimated $68.6M.
  • Rock Springs Capital Management's ten largest holdings make up 26% of its $4.76B portfolio in Q3 2021.
  • Rock Springs Capital Management opened 11 new positions and closed 14 in Q3 2021.
  • Rock Springs Capital Management's portfolio value fell 6% quarter-over-quarter to $4.76B.

Based on Rock Springs Capital Management's 13F filing for Q3 2021, filed 15 Nov 2021.