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ATEN in the 13F filings

A10 Networks Inc · CUSIP 002121101

Sector · Technology hardware and equipment
Quarter
Q2 2026Q1 2026Q4 2025Q3 2025Q2 2025Q1 2025Q4 2024Q3 2024Q2 2024Q1 2024Q4 2023Q3 2023
Quarter end
31 Mar 2026
the date the book describes
Filed
27 Oct 2026
latest of these filings; the earliest 12 May 2026
Managers listing it
27
at least, of 95 tracked, among listed positions
Comparable managers
91
filed both Q4 2025 and Q1 2026; 3 listed it in both
Shares listed
11,269,606
combined, among listed positions
Reported value
$260m
combined, at the quarter end

AllianceBernstein LP. Values in this filing are at the previous quarter end's prices; its share count is the quarter end's.

Among the 91 comparable managers: 21 buyers (opened or added shares) and 7 sellers (trimmed or exited), at least, among listed positions. Their net change in shares was +1,496,160.

Managers listing ATEN in Q1 2026

Share of 13F value is the position’s reported value over everything the manager reported that quarter. The share change is against Q4 2025, and only where both filings list the position. A rise in value with no rise in shares is the price, not buying.

27 of 27 holders

ActionFiling
Wellington Management Group LLP2,074,511$48munder 0.1%Added+54,44415 May 2026 (the filing on sec.gov)
Renaissance Technologies LLC1,784,987$41m0.06%Trimmed-349,74714 May 2026 (the filing on sec.gov)
Arrowstreet Capital LP1,497,144$35munder 0.1%Added+401,85714 May 2026 (the filing on sec.gov)
Two Sigma Investments LP1,319,989$31munder 0.1%Added+586,25515 May 2026 (the filing on sec.gov)
T. Rowe Price Associates Inc1,072,838$25munder 0.1%Trimmed-463,79015 May 2026 (the filing on sec.gov)
Jane Street Group LLC595,948$14munder 0.1%Newnew12 May 2026 (the filing on sec.gov)
Citadel Advisors LLC514,020$12munder 0.1%Added+362,00415 May 2026 (the filing on sec.gov)
Millennium Management LLC414,920$9.6munder 0.1%Added+202,84815 May 2026 (the filing on sec.gov)
Invesco Ltd362,672$8.4munder 0.1%Trimmed-473,50612 May 2026 (the filing on sec.gov)
Man Group PLC304,441$7.0munder 0.1%Added+114,10815 May 2026 (the filing on sec.gov)
D. E. Shaw & Co.263,387$6.1munder 0.1%Newnew15 May 2026 (the filing on sec.gov)
Tudor Investment Corp238,857$5.5munder 0.1%Trimmed-131,58715 May 2026 (the filing on sec.gov)
Quantbot Technologies LP124,535$2.9m0.12%Added+92,62513 May 2026 (the filing on sec.gov)
Susquehanna International Group LLP108,222$2.5munder 0.1%Added+58,20915 May 2026 (the filing on sec.gov)
PDT Partners LLC98,626$2.3m0.13%Added+63,15415 May 2026 (the filing on sec.gov)
Janus Henderson Group Ltd87,505$2.0munder 0.1%Added+55,22718 May 2026 (the filing on sec.gov)
ExodusPoint Capital Management LP72,385$1.7munder 0.1%Newnew14 May 2026 (the filing on sec.gov)
AllianceBernstein LP72,558$1.3munder 0.1%Added+2,98715 May 2026 (the filing on sec.gov)
AQR Capital Management LLC49,846$1.2munder 0.1%Added+11,24015 May 2026 (the filing on sec.gov)
Squarepoint Ops LLC45,864$1.1munder 0.1%Newnew15 May 2026 (the filing on sec.gov)
GAMCO Investors Inc42,750$988kunder 0.1%Held014 May 2026 (the filing on sec.gov)
Fidelity (FMR LLC)28,106$650kunder 0.1%Added+11,39015 May 2026 (the filing on sec.gov)
Winton Group Ltd26,457$612kunder 0.1%Trimmed-45,07012 May 2026 (the filing on sec.gov)
Brevan Howard Capital Management LP24,900$576kunder 0.1%Newnew15 May 2026 (the filing on sec.gov)
Schonfeld Strategic Advisors LLC18,035$417kunder 0.1%Newnew15 May 2026 (the filing on sec.gov)
Page 1 of 2

Largest increases and reductions, by shares

Q4 2025 to Q1 2026, among managers that listed it in both quarters or opened it.

Increases

Reductions

New positions and exits

At least these many: a manager is shown exiting only where its own filing shows the position gone.

New (8)

Exited (2)

Ownership over time

Every quarter on file. A quarter-end value moves with the price as well as with the shares held; buyers and sellers count comparable managers, by shares.
1 in Q3 2024 to 4 in Q2 2026

Tracked managers listing it, at least.

01234201720222023202420252026
the quarter shown share split complete books; unmarked quarters rest on listed positionsClick a quarter to open it.
ATEN by quarter
QuarterHoldersReported valueBuyersSellers
Q4 20161$6.3mn.a.n.a.
Q1 20171$8.7mn.a.n.a.
Q2 20171$3.2mn.a.n.a.
Q4 20201$38mn.a.n.a.
Q2 20212$35mn.a.n.a.
Q3 20213$51mn.a.n.a.
Q4 20214$69mn.a.n.a.
Q1 20224$45mn.a.n.a.
Q2 20222$45mn.a.n.a.
Q3 20221$36mn.a.n.a.
Q4 20221$41mn.a.n.a.
Q1 20231$39mn.a.n.a.
Q2 20233$37mn.a.n.a.
Q3 20232$37mn.a.n.a.
Q4 20232$31m11
Q1 20242$30m11
Q2 20242$33m20
Q3 20241$1.1m10
Q4 20242$37m02
Q1 20252$40m11
Q2 20253$50m30
Q3 20252$45m11
Q4 20253$40m1019
Q1 20263$46m217
Q2 20264$82m1018

Compare with…

Holders over time, buyers and sellers, and the managers holding both, side by side for up to four stocks.

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How much of the picture this is

A 13F is a manager’s long US-listed equity book at a quarter end, filed up to 45 days later. It shows no shorts, cash, bonds or performance, and it is never today’s portfolio. Large books are listed to their largest positions, so a manager missing from this table may still hold a small position below that line. These are 95 tracked managers, not the institutional market.

Which funds own ATEN, latest filings →Back to the 13F Explorer →