Stock Ownership/ATEN

A10 NETWORKS INC (ATEN): Ownership & Insider Activity

Hedge funds and institutional managers reporting a position in ATEN · Information Technology. Based on the most recent 13F filing from each holder, sourced from SEC EDGAR.

Reported Holders
17
13F filers
Aggregate Value
$200.5M
Across holders
Last Price
$25.23
2026-08-24
Sector
Information Technology
GICS
Quarterly fund activity7 increased10 reduced4 exited
Full exits: Schonfeld Strategic Advisors LLC, Squarepoint Ops LLC, Magnetar Financial LLC, Man Group plc
Institutional Holders of ATEN
↗
17 holders
Manager⇅Type⇅Shares⇅Market Value▼% of Total⇅% of Portfolio⇅Action⇅QoQ Change⇅Quarter⇅
RENAISSANCE TECHNOLOGIES LLC
CIK 0001037389
Hedge Fund1.52M$56.8M28.3%0.1%Reduced$-9.9MQ2 2026
ARROWSTREET CAPITAL, LIMITED PARTNERSHIP
CIK 0001164508
Hedge Fund1.44M$53.7M26.8%0.0%Reduced$-2.2MQ2 2026
TWO SIGMA INVESTMENTS, LP
CIK 0001179392
Hedge Fund1.12M$42.0M21.0%0.0%Reduced$-7.3MQ2 2026
SHAW D E & CO INC
CIK 0001009207
Hedge Fund548K$20.5M10.2%0.0%Added+$10.6MQ2 2026
MILLENNIUM MANAGEMENT LLC
CIK 0001273087
Hedge Fund176K$6.6M3.3%0.0%Reduced+$6.2MQ2 2026
TUDOR INVESTMENT CORP ET AL
CIK 0000923093
Hedge Fund120K$4.5M2.2%0.0%Reduced$-4.4MQ2 2026
Brevan Howard Capital Management LP
CIK 0001512857
Hedge Fund102K$3.8M1.9%0.0%Added+$2.9MQ2 2026
CITADEL ADVISORS LLC
CIK 0001423053
Hedge Fund93K$3.5M1.7%0.0%Reduced$-13.0MQ2 2026
AQR CAPITAL MANAGEMENT LLC
CIK 0001167557
Hedge Fund83K$3.1M1.6%0.0%Added$-5.9MQ2 2026
ExodusPoint Capital Management, LP
CIK 0001736225
Hedge Fund53K$2.0M1.0%0.0%Added—Q2 2026
RENAISSANCE TECHNOLOGIES LLCReduced
Hedge Fund
$56.8M· 28.3% of total· 0.1% port· 1.52M sh· $-9.9M QoQ· Q2 2026
ARROWSTREET CAPITAL, LIMITED PARTNERSHIPReduced
Hedge Fund
$53.7M· 26.8% of total· 0.0% port· 1.44M sh· $-2.2M QoQ· Q2 2026
TWO SIGMA INVESTMENTS, LPReduced
Hedge Fund
$42.0M· 21.0% of total· 0.0% port· 1.12M sh· $-7.3M QoQ· Q2 2026
SHAW D E & CO INCAdded
Hedge Fund
$20.5M· 10.2% of total· 0.0% port· 548K sh· +$10.6M QoQ· Q2 2026
MILLENNIUM MANAGEMENT LLCReduced
Hedge Fund
$6.6M· 3.3% of total· 0.0% port· 176K sh· +$6.2M QoQ· Q2 2026
TUDOR INVESTMENT CORP ET ALReduced
Hedge Fund
$4.5M· 2.2% of total· 0.0% port· 120K sh· $-4.4M QoQ· Q2 2026
Brevan Howard Capital Management LPAdded
Hedge Fund
$3.8M· 1.9% of total· 0.0% port· 102K sh· +$2.9M QoQ· Q2 2026
CITADEL ADVISORS LLCReduced
Hedge Fund
$3.5M· 1.7% of total· 0.0% port· 93K sh· $-13.0M QoQ· Q2 2026
AQR CAPITAL MANAGEMENT LLCAdded
Hedge Fund
$3.1M· 1.6% of total· 0.0% port· 83K sh· $-5.9M QoQ· Q2 2026
ExodusPoint Capital Management, LPAdded
Hedge Fund
$2.0M· 1.0% of total· 0.0% port· 53K sh· — QoQ· Q2 2026
Fisher Asset Management, LLCReduced
Institutional Manager
$1.9M· 0.9% of total· 0.0% port· 50K sh· $-924K QoQ· Q2 2026
Gotham Asset Management, LLCReduced
Hedge Fund
$738K· 0.4% of total· 0.0% port· 20K sh· $-5K QoQ· Q2 2026
GAMCO INVESTORS, INC. ET ALReduced
Institutional Manager
$600K· 0.3% of total· 0.0% port· 16K sh· $-998K QoQ· Q2 2026
Qube Research & Technologies LtdReduced
Hedge Fund
$454K· 0.2% of total· 0.0% port· 12K sh· $-5.4M QoQ· Q2 2026
Grantham, Mayo, Van Otterloo & Co. LLCAdded
Institutional Manager
$234K· 0.1% of total· 0.0% port· 6K sh· — QoQ· Q2 2026
Rockefeller Capital Management L.P.Added
Hedge Fund
$144K· 0.1% of total· 0.0% port· 4K sh· +$110K QoQ· Q2 2026
Fulcrum Asset Management LLPAdded
Hedge Fund
$6K· 0.0% of total· 0.0% port· 166 sh· — QoQ· Q2 2026
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