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ACM

Atika Capital Management Portfolio holdings

AUM $796M
1-Year Est. Return 167.57%
This Fund
S&P 500
This Quarter Est. Return
+27.6%
1 Year Est. Return
+167.57%
3 Year Est. Return
+553.47%
5 Year Est. Return
+1,283.26%
10 Year Est. Return
+44,203.78%
AUM
$950M
AUM Growth
-$292M
Cap. Flow
-$566M
Cap. Flow %
-59.62%
Top 10 Hldgs %
46.71%
Holding
121
New
35
Increased
14
Reduced
21
Closed
44

Top Buys

Rank Stock Value
1
MDGL icon
Madrigal Pharmaceuticals
MDGL
+$17.4M
2
COGT icon
Cogent Biosciences
COGT
+$14.2M
3
TEVA icon
Teva Pharmaceuticals
TEVA
+$12.1M
4
GOOG icon
Alphabet (Google) Class C
GOOG
+$12.1M
5
HEI icon
HEICO Corp
HEI
+$8.31M

Top Sells

Rank Stock Value
1
MSFT icon
Microsoft
MSFT
+$85.5M
2
AMZN icon
Amazon
AMZN
+$72.5M
3
SPOT icon
Spotify
SPOT
+$43.9M
4
MLM icon
Martin Marietta Materials
MLM
+$43.2M
5
ANET icon
Arista Networks
ANET
+$33.7M

Sector Composition

Rank Sector Weight
1 Healthcare 26.3%
2 Industrials 20.32%
3 Consumer Discretionary 9.92%
4 Technology 9.36%
5 Communication Services 5.34%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
XBI icon
1
PUT
State Street SPDR S&P Biotech ETF
XBI
$10.4B
$117M 12.36%
+9,625
New +$1.1M
VRT icon
2
Vertiv
VRT
$111B
$103M 10.85%
636,100
+23,000
+4% +$3.99M
LLY icon
3
Eli Lilly
LLY
$1.05T
$44.2M 4.65%
41,100
– –
ECHO
4
CALL
EchoStar
ECHO
$26.7B
$43.3M 4.56%
3,983
– –
ISRG icon
5
Intuitive Surgical
ISRG
$122B
$32.4M 3.41%
57,216
-20
-0% -$10.6K
IWM icon
6
PUT
iShares Russell 2000 ETF
IWM
$82.2B
$22.4M 2.36%
+910
New +$224K
TEVA icon
7
Teva Pharmaceuticals
TEVA
$37.3B
$22.4M 2.36%
717,000
+493,000
+220% +$12.1M
SHOP icon
8
Shopify
SHOP
$160B
$20M 2.1%
124,000
+45,500
+58% +$7.31M
MDGL icon
9
Madrigal Pharmaceuticals
MDGL
$12.8B
$19.8M 2.08%
+34,000
New +$17.4M
BWXT icon
10
BWX Technologies
BWXT
$15.7B
$18.8M 1.98%
108,900
-108,500
-50% -$20.4M
AMZN icon
11
Amazon
AMZN
$2.66T
$18.5M 1.94%
80,000
-317,049
-80% -$72.5M
COGT icon
12
Cogent Biosciences
COGT
$6.68B
$18M 1.89%
+506,000
New +$14.2M
NFLX icon
13
Netflix
NFLX
$290B
$16.9M 1.78%
180,000
– –
TLN
14
Talen Energy Corp
TLN
$17.8B
$15.8M 1.66%
42,100
-27,200
-39% -$10.6M
STX icon
15
Seagate
STX
$178B
$14.3M 1.51%
51,907
-66,189
-56% -$17.2M
CIEN icon
16
Ciena
CIEN
$53B
$14M 1.48%
60,000
-20,000
-25% -$3.88M
ECHO
17
EchoStar
ECHO
$26.7B
$13.6M 1.43%
124,806
+55,806
+81% +$4.54M
TSLA icon
18
Tesla
TSLA
$1.43T
$13.5M 1.42%
30,000
-1,000
-3% -$443K
INSM icon
19
Insmed
INSM
$23.5B
$13.4M 1.41%
77,200
-17,800
-19% -$3.25M
GOOG icon
20
Alphabet (Google) Class C
GOOG
$4.22T
$13.2M 1.39%
+42,200
New +$12.1M
TERN
21
DELISTED
Terns Pharmaceuticals
TERN
$13M 1.37%
+321,165
New +$7.42M
MTZ icon
22
MasTec
MTZ
$26B
$12.2M 1.28%
55,998
+16,498
+42% +$3.46M
MELI icon
23
Mercado Libre
MELI
$92B
$12M 1.26%
5,947
-1,983
-25% -$4.17M
GH icon
24
Guardant Health
GH
$20.7B
$11M 1.16%
108,000
-25,000
-19% -$2.24M
NET icon
25
Cloudflare
NET
$98.6B
$10.8M 1.14%
54,900
-43,110
-44% -$9.12M
1
2 3 4 5

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ATS
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BIM
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RIM
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ACM
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CAM
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Legacy Financial Group (Iowa)
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LSA
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Atika Capital Management's Q4 2025 Portfolio in Review

As of Q4 2025, Atika Capital Management held 121 positions worth $950M, down 24% from $1.24B the previous quarter. Its ten largest holdings account for 47% of the portfolio.

Atika Capital Management withdrew a net $566M in Q4 2025, closing 44 positions and reducing 21 holdings. Its most notable exit was Microsoft, an estimated $85.5M position sold in full.

By sector, the portfolio is most concentrated in Healthcare at 26% of assets, up from 17% a quarter earlier, followed by Industrials and Consumer Discretionary.

Against the trend, Atika Capital Management opened a new position in Madrigal Pharmaceuticals worth $19.8M.

  • Atika Capital Management's largest Q4 2025 buy was Madrigal Pharmaceuticals: 34,000 shares worth $19.8M.
  • Atika Capital Management added most to Teva Pharmaceuticals in Q4 2025, an estimated $12.1M increase.
  • Atika Capital Management's biggest Q4 2025 reduction was Amazon, cutting an estimated $72.5M.
  • Atika Capital Management fully exited Microsoft in Q4 2025, selling an estimated $85.5M.
  • Atika Capital Management's ten largest holdings make up 47% of its $950M portfolio in Q4 2025.
  • Atika Capital Management opened 35 new positions and closed 44 in Q4 2025.
  • Atika Capital Management's portfolio value fell 24% quarter-over-quarter to $950M.

Based on Atika Capital Management's 13F filing for Q4 2025, filed 13 Feb 2026.