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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 Dec 2025
the date the book describes
Filed
19 Feb 2026
latest of these filings; the earliest 5 Feb 2026
Managers listing it
22
at least, of 95 tracked, among listed positions
Comparable managers
92
filed both Q3 2025 and Q4 2025; 2 listed it in both
Shares listed
10,247,446
combined, among listed positions
Reported value
$181m
combined, at the quarter end

Among the 92 comparable managers: 10 buyers (opened or added shares) and 19 sellers (trimmed or exited), at least, among listed positions. Their net change in shares was -823,720.

Managers listing ATEN in Q4 2025

Share of 13F value is the position’s reported value over everything the manager reported that quarter. The share change is against Q3 2025, and only where both filings list the position. A rise in value with no rise in shares is the price, not buying.

22 of 22 holders

ActionFiling
Renaissance Technologies LLC2,134,734$38m0.06%Trimmed-252,05312 Feb 2026 (the filing on sec.gov)
Wellington Management Group LLP2,020,067$36munder 0.1%Trimmed-34,14617 Feb 2026 (the filing on sec.gov)
T. Rowe Price Associates Inc1,536,628$27munder 0.1%Trimmed-36,43717 Feb 2026 (the filing on sec.gov)
Arrowstreet Capital LP1,095,287$19munder 0.1%Trimmed-131,06013 Feb 2026 (the filing on sec.gov)
Invesco Ltd836,178$15munder 0.1%Added+95,14819 Feb 2026 (the filing on sec.gov)
Two Sigma Investments LP733,734$13munder 0.1%Added+50,48817 Feb 2026 (the filing on sec.gov)
Two Sigma Advisers LP474,000$8.4munder 0.1%Added+20,60017 Feb 2026 (the filing on sec.gov)
Tudor Investment Corp370,444$6.6munder 0.1%Added+51,02217 Feb 2026 (the filing on sec.gov)
Millennium Management LLC212,072$3.8munder 0.1%Added+67,22717 Feb 2026 (the filing on sec.gov)
Man Group PLC190,333$3.4munder 0.1%Trimmed-16,60417 Feb 2026 (the filing on sec.gov)
Citadel Advisors LLC152,016$2.7munder 0.1%Trimmed-198,77717 Feb 2026 (the filing on sec.gov)
Winton Group Ltd71,527$1.3munder 0.1%Added+76111 Feb 2026 (the filing on sec.gov)
AllianceBernstein LP69,571$1.2munder 0.1%Trimmed-16717 Feb 2026 (the filing on sec.gov)
Voloridge Investment Management LLC61,162$1.1munder 0.1%Trimmed-60,82817 Feb 2026 (the filing on sec.gov)
Susquehanna International Group LLP50,013$885kunder 0.1%Trimmed-16,30117 Feb 2026 (the filing on sec.gov)
GAMCO Investors Inc42,750$756kunder 0.1%Added+7505 Feb 2026 (the filing on sec.gov)
Verition Fund Management LLC41,948$742kunder 0.1%Newnew13 Feb 2026 (the filing on sec.gov)
AQR Capital Management LLC38,606$683kunder 0.1%Trimmed-3,85217 Feb 2026 (the filing on sec.gov)
PDT Partners LLC35,472$628kunder 0.1%Newnew17 Feb 2026 (the filing on sec.gov)
Janus Henderson Group Ltd32,278$571kunder 0.1%Held017 Feb 2026 (the filing on sec.gov)
Quantbot Technologies LP31,910$564kunder 0.1%Trimmed-1,40710 Feb 2026 (the filing on sec.gov)
Fidelity (FMR LLC)16,716$296kunder 0.1%Added+6,71117 Feb 2026 (the filing on sec.gov)

Largest increases and reductions, by shares

Q3 2025 to Q4 2025, 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 (2)

Exited (8)

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.

ATEN and AAPL →ATEN and SNDK →ATEN and CSCO →Choose a stock to compare with ATEN →

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 →