Latest Atika Capital Management LLC Stock Portfolio

$796Million– No. of Holdings #52

Atika Capital Management LLC Performance:

2026 Q1: 11.77%YTD: 11.77%2025: 27.16%

Performance for 2026 Q1 is 11.77%, and YTD is 11.77%, and 2025 is 27.16%.

About Atika Capital Management LLC and 13F Hedge Fund Stock Holdings

On 2026-05-14, the fund reported it's updated stock portfolio. In the 13F Holdings report, Atika Capital Management LLC reported an equity portfolio of $796.4 Millions as of 31 Mar, 2026.

The top stock holdings of Atika Capital Management LLC are VRT, LLY, ISRG. The fund has invested 21% of it's portfolio in VERTIV HOLDINGS CO and 4.8% of portfolio in ELI LILLY & CO.

The fund managers got completely rid off SHOPIFY INC (SHOP), MADRIGAL PHARMACEUTICALS (MDGL) and TESLA INC (TSLA) stocks. They significantly reduced their stock positions in TALEN ENERGY CORP, WARBY PARKER INC (WRBY) and AMAZON COM INC (AMZN). Atika Capital Management LLC opened new stock positions in ORUKA THERAPEUTICS INC, WESTERN DIGITAL CORP (WDC) and VANECK ETF TRUST (AFK). The fund showed a lot of confidence in some stocks as they added substantially to CLEAN HARBORS INC (CLH), ECHOSTAR CORP (SATS) and ROCKET LAB CORP.

Atika Capital Management LLC Equity Portfolio Value

Last Reported on: 14 May, 2026

Atika Capital Management LLC Annual Return Estimates Vs S&P 500

Our best estimate is that Atika Capital Management LLC made a return of 11.77% in the last quarter. In trailing 12 months, it's portfolio return was 52.91%.

Performance
S&P 500

New Buys

Ticker	$ Bought
oruka therapeutics inc	11,276,600
western digital corp	10,202,100
vaneck etf trust	7,341,600
united therapeutics corp del	7,323,300
karman hldgs inc	7,244,530
meta platforms inc	5,721,300
sitime corp	5,112,910
nlight inc	3,763,320

New stocks bought by Atika Capital Management LLC

Additions

Ticker	% Inc.
clean harbors inc	628
echostar corp	45.83
rocket lab corp	38.45
curtiss wright corp	31.55
dbv technologies s a	31.14
cloudflare inc	18.4
appfolio inc	6.74
vertiv holdings co	4.72

Additions to existing portfolio by Atika Capital Management LLC

Reductions

Ticker	% Reduced
talen energy corp	-56.08
abivax sa	-47.64
warby parker inc	-45.78
amazon com inc	-45.38
cogent biosciences inc	-42.06
ge aerospace	-40.23
qxo inc	-37.08
xenon pharmaceuticals inc	-35.25

Atika Capital Management LLC reduced stake in above stock

Sold off

Ticker	$ Sold
bath & body works inc	-4,518,000
rocket cos inc	-2,516,800
shopify inc	-19,960,300
medline inc	-4,947,600
embraer s.a.	-7,462,410
lemonade inc	-8,108,610
figure technology solutio	-4,551,500
rapt therapeutics inc	-3,192,080

Atika Capital Management LLC got rid off the above stocks

Sector Distribution

Atika Capital Management LLC has about 36.2% of it's holdings in Industrials sector.

Industrials
Healthcare
Technology
Others
Communication Services
Consumer Cyclical

Sector	%
Industrials	36.2
Healthcare	24.3
Technology	17.9
Others	11.3
Communication Services	5.6
Consumer Cyclical	4.7

Market Cap. Distribution

Atika Capital Management LLC has about 72.5% of it's portfolio invested in the large-cap and mega-cap stocks.

LARGE-CAP
MEGA-CAP
MID-CAP
UNALLOCATED
NANO-CAP
SMALL-CAP

Category	%
LARGE-CAP	58.8
MEGA-CAP	13.7
MID-CAP	11.8
UNALLOCATED	11.3
NANO-CAP	3.4
SMALL-CAP	1.1

Stocks belong to which Index?

About 38.1% of the stocks held by Atika Capital Management LLC either belong to S&P 500 or RUSSELL 2000 index.

Others
S&P 500
RUSSELL 2000

Index	%
Others	61.9
S&P 500	22.8
RUSSELL 2000	15.3

Top 5 Winners (%)		%
	dianthus therapeutics inc	101.4 %
CIEN	ciena corp	57.0 %
VRT	vertiv holdings co	52.8 %
MTZ	mastec inc	47.0 %
STX	seagate technology hldngs pl	41.4 %

Top 5 Winners ($)		$
VRT	vertiv holdings co	57.7 M
CIEN	ciena corp	8.0 M
STX	seagate technology hldngs pl	6.1 M
MTZ	mastec inc	5.9 M
	dianthus therapeutics inc	5.6 M

Top 5 Losers (%)		%
REAL	the realreal inc	-38.2 %
APPF	appfolio inc	-31.5 %
ISRG	intuitive surgical inc	-18.6 %
LLY	eli lilly & co	-14.4 %
	abivax sa	-13.3 %

Top 5 Losers ($)		$
LLY	eli lilly & co	-6.4 M
ISRG	intuitive surgical inc	-6.0 M
APPF	appfolio inc	-3.4 M
REAL	the realreal inc	-3.4 M
	talen energy corp	-1.7 M

Atika Capital Management LLC Holdings Map

This heatmap illustrates the top 50 positions within the fund's portfolio.

Current Stock Holdings of Atika Capital Management LLC

Atika Capital Management LLC has 52 stocks in it's portfolio. About 45.1% of the portfolio is in top 10 stocks. LLY proved to be the most loss making stock for the portfolio. VRT was the most profitable stock for Atika Capital Management LLC last quarter.

Last Reported on: 14 May, 2026

Ticker	Namesorted ascending	% Portfolio	Shares Held	$ Value	Type	% Change
AAOI	applied optoelectronics inc	0.00	0.00	0.00	sold off	-100

ACHC	acadia healthcare company in	0.36	122,600	2,867,610	new

AFK	vaneck etf trust	0.92	80,000	7,341,600	new

ALNY	alnylam pharmaceuticals inc	0.00	0.00	0.00	sold off	-100

AMZN	amazon com inc	1.14	43,700	9,101,400	reduced	-45.38

ANF	abercrombie & fitch co	0.00	0.00	0.00	sold off	-100

APPF	appfolio inc	0.94	47,500	7,496,450	added	6.74

ASND	ascendis pharma a/s	0.55	19,125	4,374,460	reduced	-7.35

AXSM	axsome therapeutics inc	0.00	0.00	0.00	sold off	-100

BBIO	bridgebio pharma inc	0.33	35,200	2,613,950	new

BBWI	bath & body works inc	0.00	0.00	0.00	sold off	-100

BWXT	bwx technologies inc	2.12	82,550	16,880,600	reduced	-24.2

CECE	ceco environmental corp	0.00	0.00	0.00	sold off	-100

CIEN	ciena corp	2.13	43,651	16,946,600	reduced	-27.25

CLH	clean harbors inc	0.79	21,855	6,266,480	added	628

COGT	cogent biosciences inc	1.42	293,200	11,285,300	reduced	-42.06

CSL	carlisle cos inc	0.00	0.00	0.00	sold off	-100

CW	curtiss wright corp	1.11	13,000	8,854,560	added	31.55

DASH	doordash inc	0.00	0.00	0.00	sold off	-100

DBVT	dbv technologies s a	0.71	271,300	5,667,460	added	31.14