Atika Capital Management LLC

13F filer · CIK 0001599731

Reported Aug 13, 2026

Net buyer this quarter

13F portfolio value$1.52BU.S. long equity reported on 13F

Positions6228 new · 17 closed

Net flow last quarter+$217MBuys minus sells

Top 10 positions weight37.3%Concentration

Holdings

13F · last 4 quarters free

Scroll for earlier quarters

Company	Value	% of portfolio	% of company	POSITION CHANGE qoq %	First reported
Q2 2026Reported Aug 13, 202662 positions
VRTVertiv Holdings Co	$223M	14.66%	0.17%	Not reported	Q2 2023
STXSeagate Technology Holdings plc	$77.1M	5.07%	0.04%	+49.3%	Q3 2025
AMDAdvanced Micro Devices Inc	$55.5M	3.65%	0.01%	Not reported	Q1 2023
LLYELI LILLY & Co	$49.3M	3.24%	0.00%	Not reported	Q3 2015
INTCIntel Corp	$36.9M	2.42%	0.01%	Not reported	Q3 2023
ECHOEchoStar CORP	$33.6M	2.21%	0.69%	+82.1%	Q4 2024
GHGuardant Health, Inc.	$27.2M	1.78%	0.14%	+98.9%	Q1 2019
CIENCiena Corp	$23.9M	1.57%	0.03%	+11.7%	Q3 2025
ISRGIntuitive Surgical Inc	$22.8M	1.50%	0.02%	Not reported	Q2 2016
VPGVishay Precision Group, Inc.	$17.7M	1.16%	0.96%	New	Q2 2026
MRVLMarvell Technology, Inc.	$17.3M	1.14%	0.01%	Not reported	Q1 2024
RKLBRocket Lab Corp	$17.2M	1.13%	0.03%	+96.5%	Q4 2025
WDCWestern Digital Corp	$16.9M	1.11%	0.01%	-29.8%	Q1 2026
RVMDRevolution Medicines, Inc.	$16.5M	1.08%	0.04%	New	Q2 2026
ASNDAscendis Pharma A/S	$16.3M	1.07%	0.10%	+219.0%	Q2 2018
DNTHDianthus Therapeutics, Inc.	$16.1M	1.06%	0.30%	+28.1%	Q4 2025
AXSMAxsome Therapeutics, Inc.	$15.4M	1.01%	0.12%	Not reported	Q2 2022
TEVATeva Pharmaceutical Industries Ltd	$14.9M	0.98%	0.04%	-7.8%	Q1 2015
MTZMastec Inc	$14.8M	0.97%	0.04%	-38.4%	Q4 2024
SNSharkNinja, Inc.	$13.4M	0.88%	0.06%	Not reported	Q2 2025
NFLXNetflix Inc	$12.9M	0.84%	0.00%	Not reported	Q4 2013
CWCurtiss Wright Corp	$12.1M	0.80%	0.04%	+23.1%	Q2 2025
KYMRKymera Therapeutics, Inc.	$11.9M	0.78%	0.13%	Not reported	Q1 2024
SITMSITIME Corp	$11.2M	0.74%	0.06%	+1.3%	Q1 2026
TWSTTwist Bioscience Corp	$11.1M	0.73%	0.17%	New	Q2 2026
REALTheRealReal, Inc.	$11.1M	0.73%	0.77%	+108.4%	Q4 2024
COGTCogent Biosciences, Inc.	$10.5M	0.69%	0.16%	-7.2%	Q4 2025
BWXTBWX Technologies, Inc.	$10.5M	0.69%	0.06%	-34.6%	Q2 2022
AMZNAmazon Com Inc	$10.5M	0.69%	0.00%	+0.7%	Q4 2015
TBBBBBB Foods Inc	$10.4M	0.68%	Not reported	+162.6%	Q1 2024
AXGNAxogen, Inc.	$10.2M	0.67%	0.41%	New	Q2 2026
NOKNokia Corp	$9.96M	0.65%	0.01%	New	Q2 2026
ORKAOruka Therapeutics, Inc.	$9.52M	0.63%	0.16%	-56.5%	Q1 2026
TTMITTM Technologies Inc	$9.35M	0.61%	0.05%	-46.2%	Q4 2025
CRLCharles River Laboratories International, Inc.	$8.62M	0.57%	0.08%	New	Q2 2026
ACMRACM Research, Inc.	$7.99M	0.53%	0.15%	New	Q2 2026
ROIVRoivant Sciences Ltd.	$7.68M	0.50%	0.03%	Not reported	Q4 2022
MELIMercadolibre Inc	$7.66M	0.50%	0.01%	Not reported	Q1 2020
APPFAppfolio Inc	$7.62M	0.50%	Not reported	Not reported	Q2 2023
PTGXProtagonist Therapeutics, Inc	$7.61M	0.50%	0.10%	Not reported	Q3 2025
RDDTReddit, Inc.	$7.46M	0.49%	Not reported	Not reported	Q4 2025
SMTCSemtech Corp	$7.45M	0.49%	0.05%	New	Q2 2026
FIVEFive Below, Inc	$7.19M	0.47%	0.07%	+1.3%	Q2 2016
FERGFerguson Enterprises Inc.	$6.95M	0.46%	0.02%	Not reported	Q3 2022
DFTXDefinium Therapeutics, Inc.	$5.74M	0.38%	0.09%	New	Q2 2026
IMNMImmunome Inc.	$5.57M	0.37%	0.23%	Not reported	Q1 2024
HUTHut 8 Corp.	$5.14M	0.34%	0.04%	-9.7%	Q1 2026
WRBYWarby Parker Inc.	$4.55M	0.30%	0.13%	+11.1%	Q4 2024
JATTJATT II Acquisition Corp.	$4.54M	0.30%	22.22%	New	Q2 2026
PRAXPraxis Precision Medicines, Inc.	$4.32M	0.28%	0.05%	New	Q2 2026

Q1 2026Reported May 14, 202651 positions
VRTVertiv Holdings Co	$167M	20.96%	0.17%	+4.7%	Q2 2023
LLYELI LILLY & Co	$37.8M	4.75%	0.00%	Not reported	Q3 2015
ISRGIntuitive Surgical Inc	$26.4M	3.31%	0.02%	Not reported	Q2 2016
ECHOEchoStar CORP	$21.3M	2.68%	0.38%	+45.8%	Q4 2024
STXSeagate Technology Holdings plc	$21M	2.63%	0.02%	+3.1%	Q3 2025
MTZMastec Inc	$18.5M	2.33%	0.07%	+2.9%	Q4 2024
NFLXNetflix Inc	$17.3M	2.17%	0.00%	Not reported	Q4 2013
CIENCiena Corp	$16.9M	2.13%	0.03%	-27.3%	Q3 2025
BWXTBWX Technologies, Inc.	$16.9M	2.12%	0.09%	-24.2%	Q2 2022
TERNTerns Pharmaceuticals, Inc.	$15.8M	1.99%	0.26%	-6.6%	Q4 2025
TEVATeva Pharmaceutical Industries Ltd	$14.4M	1.80%	0.04%	-33.5%	Q1 2015
NETCloudflare, Inc.	$13.4M	1.68%	Not reported	+18.4%	Q2 2020
GOOGAlphabet Inc.	$12.4M	1.56%	Not reported	+2.5%	Q4 2015
COGTCogent Biosciences, Inc.	$11.3M	1.42%	0.17%	-42.1%	Q4 2025
ORKAOruka Therapeutics, Inc.	$11.3M	1.42%	0.46%	New	Q1 2026
DNTHDianthus Therapeutics, Inc.	$10.8M	1.36%	0.24%	-4.3%	Q4 2025
WDCWestern Digital Corp	$10.2M	1.28%	0.01%	New	Q1 2026
AMZNAmazon Com Inc	$9.1M	1.14%	0.00%	-45.4%	Q4 2015
TTMITTM Technologies Inc	$9.06M	1.14%	0.09%	-8.4%	Q4 2025
FIVEFive Below, Inc	$9.02M	1.13%	0.07%	-29.8%	Q2 2016
CWCurtiss Wright Corp	$8.85M	1.11%	0.04%	+31.6%	Q2 2025
GHGuardant Health, Inc.	$8.41M	1.06%	0.07%	-15.7%	Q1 2019
MELIMercadolibre Inc	$7.8M	0.98%	0.01%	-24.2%	Q1 2020
APPFAppfolio Inc	$7.5M	0.94%	Not reported	+6.7%	Q2 2023
UTHRUNITED THERAPEUTICS Corp	$7.32M	0.92%	0.03%	Not reported	Q1 2015
KRMNKarman Holdings Inc.	$7.24M	0.91%	0.07%	New	Q1 2026
FERGFerguson Enterprises Inc.	$6.83M	0.86%	0.02%	Not reported	Q3 2022
PTGXProtagonist Therapeutics, Inc	$6.55M	0.82%	0.10%	-27.8%	Q3 2025
CLHClean Harbors Inc	$6.27M	0.79%	0.04%	+628.5%	Q4 2025
TLNTalen Energy Corp	$5.9M	0.74%	0.04%	-56.1%	Q3 2024
IMNMImmunome Inc.	$5.75M	0.72%	0.23%	-21.4%	Q1 2024
METAMeta Platforms, Inc.	$5.72M	0.72%	Not reported	Not reported	Q4 2013
DBVTDBV Technologies S.A.	$5.67M	0.71%	0.09%	+31.1%	Q3 2015
RKLBRocket Lab Corp	$5.52M	0.69%	0.01%	+38.5%	Q4 2025
HEIHeico Corp	$5.28M	0.66%	0.03%	-26.8%	Q4 2025
QXOQXO, Inc.	$5.13M	0.64%	0.04%	-37.1%	Q4 2025
SITMSITIME Corp	$5.11M	0.64%	0.06%	New	Q1 2026
GEGeneral Electric Co	$4.4M	0.55%	0.00%	-40.2%	Q1 2024
ASNDAscendis Pharma A/S	$4.37M	0.55%	0.03%	-7.4%	Q2 2018
REALTheRealReal, Inc.	$4.1M	0.51%	0.37%	-20.2%	Q4 2024
LASRNlight, Inc.	$3.76M	0.47%	0.12%	New	Q1 2026
XENEXenon Pharmaceuticals Inc.	$3.48M	0.44%	0.06%	-35.3%	Q1 2023
TBBBBBB Foods Inc	$3.37M	0.42%	Not reported	-33.1%	Q1 2024
MAZEMaze Therapeutics, Inc.	$3.33M	0.42%	0.22%	New	Q1 2026
ABVXAbivax S.A.	$3.21M	0.40%	0.04%	-47.6%	Q1 2024
ACHCAcadia Healthcare Company, Inc.	$2.87M	0.36%	0.14%	Not reported	Q3 2014
WRBYWarby Parker Inc.	$2.84M	0.36%	0.12%	-45.8%	Q4 2024
KRYSKrystal Biotech, Inc.	$2.74M	0.34%	0.04%	Not reported	Q3 2019
BBIOBridgeBio Pharma, Inc.	$2.61M	0.33%	0.02%	Not reported	Q4 2019
HUTHut 8 Corp.	$2.31M	0.29%	0.04%	New	Q1 2026

Q4 2025Reported Feb 13, 202664 positions
VRTVertiv Holdings Co	$103M	10.85%	0.17%	+3.8%	Q2 2023
LLYELI LILLY & Co	$44.2M	4.65%	0.00%	Not reported	Q3 2015
ISRGIntuitive Surgical Inc	$32.4M	3.41%	0.02%	0.0%	Q2 2016
TEVATeva Pharmaceutical Industries Ltd	$22.4M	2.36%	0.06%	+220.1%	Q1 2015
SHOPShopify Inc.	$20M	2.10%	0.03%	+58.0%	Q2 2015
MDGLMadrigal Pharmaceuticals, Inc.	$19.8M	2.08%	0.15%	Not reported	Q1 2018
BWXTBWX Technologies, Inc.	$18.8M	1.98%	0.12%	-49.9%	Q2 2022
AMZNAmazon Com Inc	$18.5M	1.94%	0.00%	-79.9%	Q4 2015
COGTCogent Biosciences, Inc.	$18M	1.89%	0.31%	New	Q4 2025
NFLXNetflix Inc	$16.9M	1.78%	0.00%	Not reported	Q4 2013
TLNTalen Energy Corp	$15.8M	1.66%	0.09%	-39.3%	Q3 2024
STXSeagate Technology Holdings plc	$14.3M	1.50%	0.02%	-56.1%	Q3 2025
CIENCiena Corp	$14M	1.48%	0.04%	-25.0%	Q3 2025
ECHOEchoStar CORP	$13.6M	1.43%	0.26%	+80.9%	Q4 2024
TSLATesla, Inc.	$13.5M	1.42%	0.00%	-3.2%	Q4 2022
INSMINSMED Inc	$13.4M	1.41%	0.04%	-18.7%	Q2 2024
GOOGAlphabet Inc.	$13.2M	1.39%	Not reported	Not reported	Q4 2015
TERNTerns Pharmaceuticals, Inc.	$13M	1.37%	0.29%	New	Q4 2025
MTZMastec Inc	$12.2M	1.28%	0.07%	+41.8%	Q4 2024
MELIMercadolibre Inc	$12M	1.26%	0.01%	-25.0%	Q1 2020
GHGuardant Health, Inc.	$11M	1.16%	0.08%	-18.8%	Q1 2019
NETCloudflare, Inc.	$10.8M	1.14%	Not reported	-44.0%	Q2 2020
FIVEFive Below, Inc	$10.6M	1.11%	0.10%	+23.5%	Q2 2016
DASHDoorDash, Inc.	$10.4M	1.10%	Not reported	-27.2%	Q1 2024
APPFAppfolio Inc	$10.4M	1.09%	Not reported	Not reported	Q2 2023
AXSMAxsome Therapeutics, Inc.	$10.1M	1.07%	0.11%	+13.3%	Q2 2022
MDBMongoDB, Inc.	$9.37M	0.99%	0.03%	Not reported	Q3 2018
REALTheRealReal, Inc.	$8.92M	0.94%	0.48%	+51.1%	Q4 2024
HEIHeico Corp	$8.51M	0.90%	0.05%	New	Q4 2025
LMNDLemonade, Inc.	$8.11M	0.85%	0.15%	+65.1%	Q3 2025
QXOQXO, Inc.	$8.1M	0.85%	0.06%	New	Q4 2025
CSLCarlisle Companies Inc	$8.09M	0.85%	0.06%	New	Q4 2025
GEGeneral Electric Co	$7.99M	0.84%	0.00%	-21.4%	Q1 2024
PTGXProtagonist Therapeutics, Inc	$7.51M	0.79%	0.14%	+3.6%	Q3 2025
EMBJEmbraer S.A.	$7.46M	0.79%	0.02%	Not reported	Q4 2024
ABVXAbivax S.A.	$7.42M	0.78%	0.07%	-20.3%	Q1 2024
IMNMImmunome Inc.	$7.18M	0.76%	0.30%	Not reported	Q1 2024
TTMITTM Technologies Inc	$7M	0.74%	0.10%	New	Q4 2025
ROKURoku, Inc	$6.62M	0.70%	0.04%	-54.1%	Q3 2017
FERGFerguson Enterprises Inc.	$6.52M	0.69%	0.02%	Not reported	Q3 2022
RHRH	$6.27M	0.66%	0.19%	Not reported	Q2 2021
SNSharkNinja, Inc.	$5.89M	0.62%	0.04%	+31.5%	Q2 2025
HOODRobinhood Markets, Inc.	$5.82M	0.61%	0.02%	-57.4%	Q1 2025
DNTHDianthus Therapeutics, Inc.	$5.54M	0.58%	0.31%	New	Q4 2025
CWCurtiss Wright Corp	$5.45M	0.57%	0.03%	-1.7%	Q2 2025
WRBYWarby Parker Inc.	$5.43M	0.57%	0.22%	Not reported	Q4 2024
MDLNMedline Inc.	$4.95M	0.52%	Not reported	New	Q4 2025
TBBBBBB Foods Inc	$4.75M	0.50%	Not reported	-10.5%	Q1 2024
FIGRFigure Technology Solutions, Inc.	$4.55M	0.48%	Not reported	+106.4%	Q3 2025
BBWIBath & Body Works, Inc.	$4.52M	0.48%	0.11%	New	Q4 2025

Q3 2025Reported Nov 13, 202575 positions
VRTVertiv Holdings Co	$92.5M	7.45%	0.16%	Not reported	Q2 2023
AMZNAmazon Com Inc	$87.2M	7.02%	0.00%	-0.3%	Q4 2015
MSFTMicrosoft Corp	$85.5M	6.88%	0.00%	+4.4%	Q4 2015
SPOTSpotify Technology S.A.	$43.9M	3.53%	0.03%	+0.6%	Q2 2018
MLMMartin Marietta Materials Inc	$43.2M	3.48%	0.11%	-5.6%	Q1 2014
BWXTBWX Technologies, Inc.	$40.1M	3.23%	0.24%	+3.3%	Q2 2022
ANETArista Networks, Inc.	$33.7M	2.71%	0.02%	-11.6%	Q1 2017
LLYELI LILLY & Co	$31.4M	2.53%	0.00%	Not reported	Q3 2015
CEGConstellation Energy Corp	$31.2M	2.51%	0.03%	Not reported	Q2 2024
TLNTalen Energy Corp	$29.5M	2.37%	0.15%	+15.9%	Q3 2024
STXSeagate Technology Holdings plc	$27.9M	2.25%	0.06%	New	Q3 2025
GEVGE Vernova Inc.	$26.1M	2.10%	0.02%	-0.3%	Q2 2024
METAMeta Platforms, Inc.	$26.1M	2.10%	Not reported	-6.6%	Q4 2013
ISRGIntuitive Surgical Inc	$25.6M	2.06%	0.02%	-4.0%	Q2 2016
VSTVistra Corp.	$24.1M	1.94%	0.04%	-0.8%	Q1 2024
NFLXNetflix Inc	$21.6M	1.74%	0.00%	+50.0%	Q4 2013
NETCloudflare, Inc.	$21M	1.69%	Not reported	+42.5%	Q2 2020
NBISNebius Group N.V.	$20.2M	1.63%	0.08%	+158.8%	Q2 2025
RBLXRoblox Corp	$19.7M	1.59%	0.02%	+30.7%	Q4 2021
VRNAVerona Pharma plc	$18.8M	1.51%	0.03%	-17.2%	Q3 2024
MELIMercadolibre Inc	$18.5M	1.49%	0.02%	-20.7%	Q1 2020
HOODRobinhood Markets, Inc.	$17.3M	1.40%	0.05%	-44.5%	Q1 2025
GKOSGLAUKOS Corp	$17.3M	1.39%	0.37%	-33.5%	Q2 2016
DASHDoorDash, Inc.	$17.2M	1.38%	Not reported	-4.8%	Q1 2024
CDTXCidara Therapeutics, Inc.	$15.1M	1.21%	0.54%	New	Q3 2025
INSPInspire Medical Systems, Inc.	$13.9M	1.12%	0.65%	+15.9%	Q2 2018
NVDANvidia Corp	$13.8M	1.11%	0.00%	+25.7%	Q1 2020
TSLATesla, Inc.	$13.8M	1.11%	0.00%	Not reported	Q4 2022
INSMINSMED Inc	$13.7M	1.10%	0.04%	Not reported	Q2 2024
ADBEAdobe Inc.	$13.7M	1.10%	0.01%	+73.6%	Q1 2018
ROKURoku, Inc	$13.3M	1.07%	0.09%	+198.2%	Q3 2017
APPFAppfolio Inc	$12.3M	0.99%	Not reported	Not reported	Q2 2023
SHOPShopify Inc.	$11.7M	0.94%	0.02%	+13.1%	Q2 2015
CIENCiena Corp	$11.7M	0.94%	0.06%	New	Q3 2025
ALNYAlnylam Pharmaceuticals, Inc.	$10.1M	0.82%	0.02%	-19.8%	Q2 2014
GEGeneral Electric Co	$9.93M	0.80%	0.00%	+5.0%	Q1 2024
EYENational Vision Holdings, Inc.	$8.79M	0.71%	0.38%	-27.3%	Q2 2025
ASMLAsml Holding NV	$8.46M	0.68%	0.00%	Not reported	Q4 2023
MTZMastec Inc	$8.41M	0.68%	0.05%	-19.7%	Q4 2024
GHGuardant Health, Inc.	$8.31M	0.67%	0.11%	+49.1%	Q1 2019
NTRANatera, Inc.	$7.48M	0.60%	0.03%	Not reported	Q3 2018
DHIHorton D R Inc	$7.46M	0.60%	0.01%	New	Q3 2025
DUOLDuolingo, Inc.	$7.14M	0.58%	0.13%	+5.2%	Q1 2023
FIVEFive Below, Inc	$7.04M	0.57%	0.08%	Not reported	Q2 2016
MLYSMineralys Therapeutics, Inc.	$6.6M	0.53%	0.22%	New	Q3 2025
FERGFerguson Enterprises Inc.	$6.58M	0.53%	0.01%	Not reported	Q3 2022
AXSMAxsome Therapeutics, Inc.	$5.95M	0.48%	0.10%	+6.2%	Q2 2022
ABVXAbivax S.A.	$5.86M	0.47%	0.11%	Not reported	Q1 2024
PTGXProtagonist Therapeutics, Inc	$5.51M	0.44%	0.13%	New	Q3 2025
CALXCalix, Inc	$5.49M	0.44%	0.14%	Not reported	Q4 2020

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