Free · no sign-up · Q2 2026

Which funds own ATEN

A10 Networks Inc in the Q2 2026 filings. At least 2 of the 91 current managers on file reported a position, worth $30m between them. It is among the largest positions of fewer than a fifth of the current managers on file. Buying and selling roughly cancelled this quarter, which is what a name looks like when the argument is still live.

Managers holding: 2; at least, of 91 current
Combined value: $30m; as reported
Opened: 1; new this quarter
Added to: 1; already held
Trimmed or sold out: 2; 2 sold out entirely

Only each manager’s largest 200 positions are listed here, so a smaller holder may be missing.

Managers reporting a position

Largest first. Weight is the share of that manager’s whole reported book, which is the number worth quoting: $400m is a rounding error in one book and a defining bet in another.

Manager	Value	Weight	Shares	Change on the quarter	Action
Davidson Kempner Capital Management LP Long/short equity · $8.4bn book	$25m	0.3%	15,000,000	opened15,000,000	New
PDT Partners LLC Quantitative · $1.9bn book	$4.2m	0.2%	111,226	+$1.9m+12,600	Added

Sold out of this quarter

Valued at what the position was worth in the previous filing, because by this one it is gone.

Man Group PLC · Quantitative$7.0m held before
Quantbot Technologies LP · Quantitative$2.9m held before

Ownership through time

At least 4 of the 95 managers whose filings are on file listed ATEN in Q2 2026, against 1 in Q4 2016. 1 manager more than in Q1 2026: 1 started a position; 1 listed it again; 1 no longer listed it among the positions read, which can mean a holding below the listed range, a filing that reported no holdings, or a filing not yet made.

Each manager’s largest 500 positions a quarter are read, so a small holding in a very large book can be missing, and a manager is counted as leaving only where its own filing shows it.

Managers on file listing it

Their combined reported value

Between the quarter ends of Q1 2026 and Q2 2026. Each change in shares is valued at the Q2 2026 price, so the price’s own move is left out; a 13F shows the two quarter ends, not when in between anything was bought or sold.

Started in Q2 2026

Acadian Asset Management LLC$17m

Largest increases, by shares

Acadian Asset Management LLCnew: 455,769 shares+$17m
PDT Partners LLC98,626 to 111,226 shares+$471k

Largest decreases, by shares

Renaissance Technologies LLC1,784,987 to 1,520,287 shares-$9.9m

Left it

No manager on file is shown leaving it.

Manager	First listed	Largest	Q2 2026
Renaissance Technologies LLC	Q4 2020	$57m	$57m
Acadian Asset Management LLC	Q4 2016	$17m	$17m
PDT Partners LLC	Q1 2022	$4.2m	$4.2m
Brevan Howard Capital Management LP	Q2 2026	$3.8m	$3.8m
Two Sigma Advisers LP	Q3 2021	$16m	last listed Q4 2021
Tudor Investment Corp	Q4 2021	$3.8m	last listed Q2 2022
Quantbot Technologies LP	Q1 2026	$2.9m	last listed Q1 2026
Winton Group Ltd	Q2 2023	$1.4m	last listed Q4 2025
First Eagle Investment Management LLC	Q2 2021	$1.4m	last listed Q1 2022
Freestone Grove Partners LP	Q2 2025	$691k	last listed Q2 2025
Caxton Associates LLP	Q2 2023	$234k	last listed Q2 2023

What ATEN is worth

Knowing who owns it is half the question. The other half is what it is worth against the companies it trades beside, which is the one an interviewer will follow up with.

Build the comp set around ATEN →

How much of the picture this is

A Form 13F reports US-listed long equity and nothing else: no shorts, no bonds, no cash and no non-US listings. It arrives forty-five days after the quarter ends, so a manager who sold in July still shows the position in a filing published in August. This page reads the managers on file here rather than every filer in the market, and each manager’s largest positions rather than the whole table, so a small position in a very large book may not appear. Say “their last filing showed” rather than “they own”, and the distinction will do you credit.

What to do with a name the funds are buying

Knowing who owns something is the start of a pitch, not the pitch. The next questions are what it is worth and why they were buying.

Comps ExplorerValue it against the peers it trades beside Every managerRead any of these books in full Deal tapeWhat buyers paid for whole companies, not slices Hedge fund interviewsHow the room runs, and the stock pitch it wants

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The holdings, every quarter, and the week between

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