Stocks/Funds/CIK 1599731

Atika Capital Management LLC

long-term holder
Quarterly 13F filings · Latest period 2026-03-31 · CIK 1599731
Assets
$634M
-1.6% YoY
Holdings
52
Lifetime alpha vs market
+4.92% annual
Average hold time
2.2 yr
median 1.1 yr

Quarterly history

Cum return +84% vs S&P +52% · α +32% lifetimeAUM $634M · peak $1.4BFlow $-134M (-19%)2016-062017-122019-062020-122022-062023-122025-062026-03
AUM ($B)fundS&P 500(gap = α)/ Flow in/out

Behavior signals (lifetime)

Dip response
-12.80%
trims when stocks drop
when a holding falls −10%+
Middle response
-10.76%
baseline attrition
Rally response
-4.83%
trims into rallies
when a holding rises +10%+

Top positions · 30

Ticker$ value% portYoYHold time
VRTVertiv Holdings Co$167M26.3%+247.5%3.0 yr
LLYEli Lilly and Company$38M6.0%+12.2%3.8 yr
ISRGIntuitive Surgical, Inc.$26M4.2%-6.9%8.5 yr
SATSEchoStar Corporation$21M3.4%+357.7%1.5 yr
STXSeagate Technology Holdi$21M3.3%+366.3%0.8 yr
MTZMasTec, Inc.$19M2.9%+175.7%1.3 yr
NFLXNetflix, Inc.$17M2.7%+3.1%9.3 yr
CIENCiena Corporation$17M2.7%+542.4%0.8 yr
BWXTBWX Technologies, Inc.$17M2.7%+108.6%4.0 yr
TERNTerns Pharmaceuticals, I$16M2.5%0.5 yr
TEVATeva Pharmaceutical Indu$14M2.3%+96.0%1.0 yr
NETCloudflare, Inc.$13M2.1%+83.1%5.5 yr
GOOGAlphabet Inc.$12M2.0%+84.3%3.5 yr
COGTCogent Biosciences, Inc.$11M1.8%+542.6%0.5 yr
ORKAOruka Therapeutics, Inc.$11M1.8%+378.1%0.3 yr

Portfolio composition (YoY)

Industry mix
Electrical Equipment & Parts26.3%+20.9pp$167M
Biotechnology13.3%+8.6pp$84M
Aerospace & Defense8.0%+3.7pp$50M
Communication Equipment6.0%+5.2pp$38M
Drug Manufacturers - General6.0%+1.7pp$38M
Computer Hardware4.9%+2.3pp$31M
Medical - Devices4.2%-10.1pp$26M
Engineering & Construction2.9%$19M
Internet Content & Information2.9%-6.5pp$18M
Entertainment2.7%-1.1pp$17M
Country
US88.6%+8.8pp
SG3.3%
IL2.3%-1.7pp
Unknown2.1%-1.7pp
UY1.2%-1.2pp
GB1.1%-1.7pp
CA0.9%+0.1pp
FR0.5%
Top 5: 43.1% · Top 10: 56.6% · Top 25: 80.4%

Winners

TickerPrev $PnLYoY %
VRT$35M+0.09B247.5%
SATS$5M+0.02B357.7%
BWXT$11M+0.01B108.6%
TEVA$7M+0.01B96.0%
AMZN$60M+0.01B9.5%

Losers

TickerPrev $PnLYoY %
APPF$10M-0.00B-28.2%
ISRG$27M-0.00B-6.9%
MELI$15M-0.00B-11.4%

Top buys this quarter · 15

ORKA Oruka Therapeutics, Inc.new+$11M
WDC Western Digital Corporationnew+$10M
VRT Vertiv Holdings Co+$8M
KRMN Karman Holdings Inc.new+$7M
SATS EchoStar Corporation+$7M
CLH Clean Harbors, Inc.+$5M
SITM SiTime Corporationnew+$5M
LASR nLIGHT, Inc.new+$4M
MAZE Maze Therapeutics, Inc.new+$3M
HUT.TO Hut 8 Mining Corp.new+$3M

Top sells this quarter · 15

MDGL Madrigal Pharmaceuticals, Inc.exit$18M
SHOP Shopify Inc.exit$15M
META Meta Platforms, Inc.$15M
TSLA Tesla, Inc.exit$11M
UTHR United Therapeutics Corporatio$11M
AXSM Axsome Therapeutics, Inc.exit$9M
CSL Carlisle Companies Incorporateexit$8M
COGT Cogent Biosciences, Inc.$8M
AMZN Amazon.com, Inc.$8M
TLN Talen Energy Corporation$8M

Quarterly history (TTM returns)

PeriodAUM# PosReturn (1yr)SPY (1yr)Alpha (1yr)Flow
2026-03-31$634M52+57.38%+17.59%+39.79%-0.13B
2025-12-31$705M63+32.11%+17.72%+14.39%-0.51B
2025-09-30$1.16B74+29.40%+17.52%+11.88%+0.11B
2025-06-30$957M56+26.58%+14.94%+11.64%+0.15B
2025-03-31$644M52+2.12%+8.30%-6.19%-0.06B
2024-12-31$772M73+29.06%+24.89%+4.17%-0.18B
2024-09-30$931M73+44.64%+36.04%+8.61%+0.00B
2024-06-30$860M74+23.60%+24.49%-0.89%-0.04B
2024-03-31$892M79+32.45%+29.62%+2.82%+0.08B
2023-12-31$703M69+11.16%+26.18%-15.02%-0.10B
2023-09-30$702M69+0.29%+21.57%-21.28%-0.03B
2023-06-30$796M70+19.47%+19.42%+0.04%+0.10B
2023-03-31$642M69-13.36%-7.82%-5.54%+0.01B
2022-12-31$655M57+3.72%+7.56%-3.84%-0.26B
2022-09-30$884M61+9.67%-4.93%+14.60%+0.04B
2022-06-30$766M55-21.49%-16.11%-5.38%-0.06B