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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
+15.5%
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
$2.17B
AUM Growth
+$187M
Cap. Flow
-$13.4M
Cap. Flow %
-0.62%
Top 10 Hldgs %
27.68%
Holding
163
New
13
Increased
39
Reduced
20
Closed
16

Top Buys

Rank Stock Value
1
UNH icon
UnitedHealth
UNH
+$28M
2
IRTC icon
iRhythm Holdings
IRTC
+$17.5M
3
PBYI icon
Puma Biotechnology
PBYI
+$13.4M
4
PTLA
Portola Pharmaceuticals, Inc.
PTLA
+$10.8M
5
MOH icon
Molina Healthcare
MOH
+$10.4M

Top Sells

Rank Stock Value
1
AGN
Allergan plc
AGN
+$37.9M
2
HUM icon
Humana
HUM
+$31.9M
3
HOLX
Hologic
HOLX
+$19.1M
4
MDT icon
Medtronic
MDT
+$12.7M
5
WBA
Walgreens Boots Alliance
WBA
+$6.74M

Sector Composition

Rank Sector Weight
1 Healthcare 80.49%
2 Financials 3.75%
3 Consumer Discretionary 0.9%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
VRTX icon
26
Vertex Pharmaceuticals
VRTX
$123B
$23M 1.06%
151,500
+22,500
+17% +$3.39M
MRSN
27
DELISTED
Mersana Therapeutics
MRSN
$23M 1.06%
53,200
-7,916
-13% -$3.12M
JNJ icon
28
Johnson & Johnson
JNJ
$619B
$22.8M 1.05%
175,000
– –
TBPH icon
29
Theravance Biopharma
TBPH
$877M
$22.1M 1.02%
644,400
+44,400
+7% +$1.45M
LKFT
30
Lakefront Biotherapeutics American Depositary Shares
LKFT
$1.71B
$21.8M 1%
214,000
-7,500
-3% -$655K
TMO icon
31
Thermo Fisher Scientific
TMO
$214B
$20.8M 0.96%
110,000
– –
EW icon
32
Edwards Lifesciences
EW
$51.5B
$20.8M 0.96%
570,003
– –
EXAS
33
DELISTED
Exact Sciences
EXAS
$20.6M 0.95%
437,400
-100
-0% -$4.03K
INSM icon
34
Insmed
INSM
$28.7B
$20.3M 0.94%
650,000
+182,000
+39% +$3.47M
INCY icon
35
Incyte
INCY
$24B
$20.2M 0.93%
173,000
– –
PRTA icon
36
Prothena Corp
PRTA
$449M
$20M 0.92%
309,500
– –
IRTC icon
37
iRhythm Holdings
IRTC
$4.21B
$20M 0.92%
+386,000
New +$17.5M
AFAM
38
DELISTED
Almost Family Inc
AFAM
$19.4M 0.9%
362,000
– –
DHR icon
39
Danaher
DHR
$141B
$19.3M 0.89%
253,800
– –
MDT icon
40
Medtronic
MDT
$110B
$19.2M 0.89%
247,364
-152,636
-38% -$12.7M
CLVS
41
DELISTED
Clovis Oncology, Inc.
CLVS
$19.1M 0.88%
231,500
– –
COLL icon
42
Collegium Pharmaceutical
COLL
$944M
$18.9M 0.87%
1,805,000
+6,805
+0.4% +$75K
BCR
43
DELISTED
CR Bard Inc.
BCR
$18.4M 0.85%
57,500
– –
JAZZ icon
44
Jazz Pharmaceuticals
JAZZ
$16.7B
$18.1M 0.83%
123,700
– –
WTW icon
45
Willis Towers Watson
WTW
$31.6B
$17.7M 0.82%
115,000
+5,000
+5% +$747K
PTLA
46
DELISTED
Portola Pharmaceuticals, Inc.
PTLA
$17.5M 0.81%
323,800
+184,100
+132% +$10.8M
KYNB
47
Kyntra Bio
KYNB
$28.3M
$17.5M 0.81%
13,000
+1,800
+16% +$1.9M
WMGI
48
DELISTED
Wright Medical Group Inc
WMGI
$17.3M 0.8%
670,000
– –
AVXS
49
DELISTED
AveXis, Inc. Common Stock
AVXS
$16.9M 0.78%
175,000
– –
BIIB icon
50
Biogen
BIIB
$30.5B
$16.6M 0.77%
53,000
– –
1
2
3 4 5

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Rock Springs Capital Management's Q3 2017 Portfolio in Review

As of Q3 2017, Rock Springs Capital Management held 163 positions worth $2.17B, up 9.5% from $1.98B the previous quarter. Its ten largest holdings account for 28% of the portfolio.

Rock Springs Capital Management's Q3 2017 filing shows 13 new, 39 increased, 20 reduced and 16 closed positions. Its largest new stake was iRhythm Holdings: 386,000 shares worth $20M. The largest sale was Allergan plc, an estimated $37.9M.

By sector, the portfolio is most concentrated in Healthcare at 80% of assets, up from 80% a quarter earlier, followed by Financials and Consumer Discretionary.

  • Rock Springs Capital Management's largest Q3 2017 buy was iRhythm Holdings: 386,000 shares worth $20M.
  • Rock Springs Capital Management added most to UnitedHealth in Q3 2017, an estimated $28M increase.
  • Rock Springs Capital Management's biggest Q3 2017 reduction was Medtronic, cutting an estimated $12.7M.
  • Rock Springs Capital Management fully exited Allergan plc in Q3 2017, selling an estimated $37.9M.
  • Rock Springs Capital Management's ten largest holdings make up 28% of its $2.17B portfolio in Q3 2017.
  • Rock Springs Capital Management opened 13 new positions and closed 16 in Q3 2017.
  • Rock Springs Capital Management's portfolio value rose 9.5% quarter-over-quarter to $2.17B.

Based on Rock Springs Capital Management's 13F filing for Q3 2017, filed 14 Nov 2017.