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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
+23.88%
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
$796M
AUM Growth
-$153M
Cap. Flow
-$209M
Cap. Flow %
-26.22%
Top 10 Hldgs %
52.34%
Holding
96
New
19
Increased
12
Reduced
25
Closed
36

Top Buys

Rank Stock Value
1
WDC icon
Western Digital
WDC
+$9.85M
2
KRMN
Karman Holdings
KRMN
+$8.73M
3
ORKA
Oruka Therapeutics
ORKA
+$7.99M
4
GDX icon
VanEck Gold Miners ETF
GDX
+$7.88M
5
VRT icon
Vertiv
VRT
+$6.66M

Top Sells

Rank Stock Value
1
SHOP icon
Shopify
SHOP
+$20M
2
MDGL icon
Madrigal Pharmaceuticals
MDGL
+$19.8M
3
TSLA icon
Tesla
TSLA
+$13.5M
4
INSM icon
Insmed
INSM
+$13.4M
5
DASH icon
DoorDash
DASH
+$10.4M

Sector Composition

Rank Sector Weight
1 Industrials 31.91%
2 Healthcare 23.47%
3 Technology 10.92%
4 Communication Services 7.13%
5 Consumer Discretionary 3.77%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
VRT icon
1
Vertiv
VRT
$113B
$167M 20.96%
666,100
+30,000
+5% +$6.66M
XBI icon
2
PUT
State Street SPDR S&P Biotech ETF
XBI
$10.4B
$54M 6.78%
4,225
-5,400
-56% -$674K
LLY icon
3
Eli Lilly
LLY
$1.04T
$37.8M 4.75%
41,100
– –
SMH icon
4
PUT
VanEck Semiconductor ETF
SMH
$67.5B
$27.6M 3.47%
+720
New +$286K
ISRG icon
5
Intuitive Surgical
ISRG
$142B
$26.4M 3.31%
57,216
– –
IWM icon
6
PUT
iShares Russell 2000 ETF
IWM
$82.2B
$24.8M 3.11%
1,000
+90
+10% +$23.2K
ECHO
7
EchoStar
ECHO
$26.5B
$21.3M 2.68%
182,000
+57,194
+46% +$6.56M
STX icon
8
Seagate
STX
$169B
$21M 2.63%
53,500
+1,593
+3% +$608K
MTZ icon
9
MasTec
MTZ
$26.9B
$18.5M 2.33%
57,636
+1,638
+3% +$443K
ECHO
10
CALL
EchoStar
ECHO
$26.5B
$18.5M 2.33%
1,583
-2,400
-60% -$275K
NFLX icon
11
Netflix
NFLX
$313B
$17.3M 2.17%
180,000
– –
CIEN icon
12
Ciena
CIEN
$55B
$16.9M 2.13%
43,651
-16,349
-27% -$5M
BWXT icon
13
BWX Technologies
BWXT
$15.9B
$16.9M 2.12%
82,550
-26,350
-24% -$5.35M
NFLX icon
14
CALL
Netflix
NFLX
$313B
$15.9M 1.99%
+1,650
New +$145K
TERN
15
DELISTED
Terns Pharmaceuticals
TERN
$15.8M 1.99%
300,000
-21,165
-7% -$869K
TEVA icon
16
Teva Pharmaceuticals
TEVA
$37.5B
$14.4M 1.8%
477,000
-240,000
-33% -$7.72M
GDX icon
17
CALL
VanEck Gold Miners ETF
GDX
$21.8B
$13.8M 1.73%
+1,500
New +$148K
NET icon
18
Cloudflare
NET
$96.7B
$13.4M 1.68%
65,000
+10,100
+18% +$1.93M
GOOG icon
19
Alphabet (Google) Class C
GOOG
$4.32T
$12.4M 1.56%
43,250
+1,050
+2% +$330K
COGT icon
20
Cogent Biosciences
COGT
$6.48B
$11.3M 1.42%
293,200
-212,800
-42% -$7.86M
ORKA
21
Oruka Therapeutics
ORKA
$5.01B
$11.3M 1.42%
+229,900
New +$7.99M
DNTH icon
22
Dianthus Therapeutics
DNTH
$5.21B
$10.8M 1.36%
128,800
-5,728
-4% -$332K
WDC icon
23
Western Digital
WDC
$161B
$10.2M 1.28%
+37,717
New +$9.85M
AMZN icon
24
Amazon
AMZN
$2.69T
$9.1M 1.14%
43,700
-36,300
-45% -$7.99M
TTMI icon
25
TTM Technologies
TTMI
$13.5B
$9.06M 1.14%
93,000
-8,473
-8% -$806K
1
2 3 4

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ATS
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BIM
Barton Investment Management West Conshohocken, Pennsylvania $797M AUM 11.92% 1-Year Est. Return
RIM
Rovida Investment Management Grand Cayman, Cayman Islands $797M AUM 111.83% 1-Year Est. Return
ACM
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Legacy Financial Group (Iowa)
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LSA
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Atika Capital Management's Q1 2026 Portfolio in Review

As of Q1 2026, Atika Capital Management held 96 positions worth $796M, down 16% from $950M the previous quarter. Its ten largest holdings account for 52% of the portfolio.

Atika Capital Management withdrew a net $209M in Q1 2026, closing 36 positions and reducing 25 holdings. Its most notable exit was Shopify, an estimated $20M position sold in full.

By sector, the portfolio is most concentrated in Industrials at 32% of assets, up from 20% a quarter earlier, followed by Healthcare and Technology.

Against the trend, Atika Capital Management opened a new position in Western Digital worth $10.2M.

  • Atika Capital Management's largest Q1 2026 buy was Western Digital: 37,717 shares worth $10.2M.
  • Atika Capital Management added most to Vertiv in Q1 2026, an estimated $6.66M increase.
  • Atika Capital Management's biggest Q1 2026 reduction was Talen Energy Corp, cutting an estimated $8.33M.
  • Atika Capital Management fully exited Shopify in Q1 2026, selling an estimated $20M.
  • Atika Capital Management's ten largest holdings make up 52% of its $796M portfolio in Q1 2026.
  • Atika Capital Management opened 19 new positions and closed 36 in Q1 2026.
  • Atika Capital Management's portfolio value fell 16% quarter-over-quarter to $796M.

Based on Atika Capital Management's 13F filing for Q1 2026, filed 14 May 2026.