What does CUSIP 002121101 represent in this 13F holders report?

CUSIP 002121101 is the security identifier for ATEN - A10 Networks, Inc. - Common Stock used to aggregate holder disclosures.

How many institutions held ATEN - A10 Networks, Inc. - Common Stock in Q4 2021?

174 institutional investors reported ATEN - A10 Networks, Inc. - Common Stock for Q4 2021. Use the holders table for investor-level position and value details.

A10 Networks, Inc. - Common Stock (ATEN)

CUSIP: 002121101

Q4 2021 13F Holders as of 31 Dec 2021

Type / Class: Equity / Common Stock
Shares outstanding: 77,603,290
Total 13F shares: 64,752,279
Share change: -3,211,041
Total reported value: $1,072,853,997
Put/Call ratio: 73%
Price per share: $16.58
Number of holders: 174
Value change: -$50,652,948
Number of buys: 97
Number of sells: 71

Quarterly Holders Quick Answers

What is CUSIP 002121101?
CUSIP 002121101 identifies ATEN - A10 Networks, Inc. - Common Stock in SEC institutional holdings data.

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Related Filing Research

Latest 13F filings for newly reported positions.
Latest Schedule 13D/13G reports for ownership changes outside 13F cadence.
Latest 10-Q/10-K reports for financial context tied to this issuer.
Recent insider transactions for executive and insider activity.
SEC investors directory and top value investors for manager drilldown.
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Explore More Reporting Periods

Jump to adjacent filing periods for faster comparison and easier crawl discovery.

Newer quarter: Q1 2022
Previous quarter: Q3 2021

Recent filing periods for CUSIP 002121101:

Q1 2026 Q4 2025 Q3 2025 Q2 2025 Q1 2025 Q4 2024 Q3 2024 Q2 2024

Top shareholders of ATEN - A10 Networks, Inc. - Common Stock (13F + 13D/G + 3/4/5)

Grouped by holder across the latest SEC ownership disclosures. Ownership % is shown only when it is directly reported or safely comparable across share classes.

Methodology: rows are grouped by holder and ranked by the holder's primary source value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.

Holder	Source	Role / Reporting	Ownership %	Shares	Holdings Value	12M Net Δ	As of	Details
SUMMIT PARTNERS L P	13F	Company	12%	9,560,941	$128,881,000	—	30 Sep 2021	13F
VIEX Capital Advisors, LLC	13F	Company	9.9%	7,691,096	$103,676,000	—	30 Sep 2021	13F
VANGUARD GROUP INC	13F	Company	7.1%	5,476,226	$73,820,000	—	30 Sep 2021	13F
BlackRock Finance, Inc.	13F	Company	5.9%	4,544,300	$61,258,000	—	30 Sep 2021	13F
ALLIANCEBERNSTEIN L.P.	13F	Company	4.9%	3,769,272	$50,810,000	—	30 Sep 2021	13F
Legal & General Investment Management Ltd	13D/G	Legal & General Group Plc	3.1%	2,405,702	$46,550,093	$0	31 Dec 2021	13D/G
RENAISSANCE TECHNOLOGIES LLC	13F	Company	3.8%	2,931,336	$39,514,000	—	30 Sep 2021	13F
Legal & General Group Plc	13F	Company	3.6%	2,770,574	$37,347,000	—	30 Sep 2021	13F
FIRST TRUST ADVISORS LP	13F	Company	2.9%	2,284,261	$30,792,000	—	30 Sep 2021	13F
ETF MANAGERS GROUP, LLC	13F	Company	2.7%	2,061,551	$27,645,000	—	30 Sep 2021	13F
STATE STREET CORP	13F	Company	2.5%	1,902,401	$25,644,000	—	30 Sep 2021	13F
ROYCE & ASSOCIATES LP	13F	Company	2%	1,557,091	$20,990,000	—	30 Sep 2021	13F
Bank of New York Mellon Corp	13F	Company	2%	1,516,453	$20,441,000	—	30 Sep 2021	13F
JACOBS LEVY EQUITY MANAGEMENT, INC	13F	Company	1.6%	1,269,342	$17,111,000	—	30 Sep 2021	13F
PEREGRINE CAPITAL MANAGEMENT LLC	13F	Company	1.5%	1,132,325	$15,264,000	—	30 Sep 2021	13F
GEODE CAPITAL MANAGEMENT, LLC	13F	Company	1.4%	1,114,333	$15,021,000	—	30 Sep 2021	13F
JPMORGAN CHASE & CO	13F	Company	1.1%	885,821	$11,941,000	—	30 Sep 2021	13F
TWO SIGMA ADVISERS, LP	13F	Company	1.1%	825,400	$11,126,000	—	30 Sep 2021	13F
DIMENSIONAL FUND ADVISORS LP	13F	Company	1%	806,962	$10,878,000	—	30 Sep 2021	13F
TWO SIGMA INVESTMENTS, LP	13F	Company	0.8%	624,068	$8,412,000	—	30 Sep 2021	13F
Penserra Capital Management LLC	13F	Company	0.8%	622,287	$8,388,000	—	30 Sep 2021	13F
CHARLES SCHWAB INVESTMENT MANAGEMENT INC	13F	Company	0.8%	620,669	$8,367,000	—	30 Sep 2021	13F
NORTHERN TRUST CORP	13F	Company	0.78%	606,062	$8,170,000	—	30 Sep 2021	13F
Assenagon Asset Management S.A.	13F	Company	0.75%	584,792	$7,883,000	—	30 Sep 2021	13F
Mirae Asset Global Investments Co., Ltd.	13F	Company	0.71%	553,847	$7,466,000	—	30 Sep 2021	13F
RICE HALL JAMES & ASSOCIATES, LLC	13F	Company	0.65%	501,226	$6,757,000	—	30 Sep 2021	13F
BNP PARIBAS FINANCIAL MARKETS	13F	Company	0.64%	499,775	$6,736,967	—	30 Sep 2021	13F
PARADIGM CAPITAL MANAGEMENT INC/NY	13F	Company	0.55%	426,600	$5,751,000	—	30 Sep 2021	13F
PRUDENTIAL FINANCIAL INC	13F	Company	0.54%	417,091	$5,623,000	—	30 Sep 2021	13F
MILLENNIUM MANAGEMENT LLC	13F	Company	0.53%	408,630	$5,508,000	—	30 Sep 2021	13F
MORGAN STANLEY	13F	Company	0.49%	376,453	$5,074,000	—	30 Sep 2021	13F
Hillsdale Investment Management Inc.	13F	Company	0.48%	374,000	$5,042,000	—	30 Sep 2021	13F
BANK OF MONTREAL /CAN/	13F	Company	0.44%	344,138	$4,673,000	—	30 Sep 2021	13F
Informed Momentum Co LLC	13F	Company	0.4%	311,218	$4,195,000	—	30 Sep 2021	13F
Nuveen Asset Management, LLC	13F	Company	0.36%	280,376	$3,875,000	—	30 Sep 2021	13F
PARAMETRIC PORTFOLIO ASSOCIATES LLC	13F	Company	0.37%	287,097	$3,870,000	—	30 Sep 2021	13F
Migdal Insurance & Financial Holdings Ltd.	13F	Company	0.37%	284,692	$3,822,000	—	30 Sep 2021	13F
LOS ANGELES CAPITAL MANAGEMENT LLC	13F	Company	0.35%	268,725	$3,622,000	—	30 Sep 2021	13F
CITIGROUP INC	13F	Company	0.34%	267,716	$3,609,000	—	30 Sep 2021	13F
FULLER & THALER ASSET MANAGEMENT, INC.	13F	Company	0.33%	257,670	$3,473,000	—	30 Sep 2021	13F
Global IMC LLC	13F	Company	0.3%	232,800	$3,138,000	—	30 Sep 2021	13F
Bridge City Capital, LLC	13F	Company	0.3%	230,717	$3,110,000	—	30 Sep 2021	13F
GOLDMAN SACHS GROUP INC	13F	Company	0.3%	230,077	$3,101,000	—	30 Sep 2021	13F
Russell Investments Group, Ltd.	13F	Company	0.27%	211,730	$2,852,000	—	30 Sep 2021	13F
NEW YORK STATE COMMON RETIREMENT FUND	13F	Company	0.26%	201,760	$2,720,000	—	30 Sep 2021	13F
JUPITER ASSET MANAGEMENT LTD	13F	Company	0.26%	201,447	$2,713,000	—	30 Sep 2021	13F
Walthausen & Co., LLC	13F	Company	0.24%	186,780	$2,518,000	—	30 Sep 2021	13F
STATE BOARD OF ADMINISTRATION OF FLORIDA RETIREMENT SYSTEM	13F	Company	0.23%	175,854	$2,371,000	—	30 Sep 2021	13F
MARTINGALE ASSET MANAGEMENT L P	13F	Company	0.22%	173,089	$2,335,000	—	30 Sep 2021	13F
WELLS FARGO & COMPANY/MN	13F	Company	0.21%	164,142	$2,213,000	—	30 Sep 2021	13F

Institutional Holders of A10 Networks, Inc. - Common Stock (ATEN) as of Q4 2021

As of 31 Dec 2021, A10 Networks, Inc. - Common Stock (ATEN) was held by 174 institutional shareholders that filed Form 13F with the SEC. Together, they reported ownership of 64,752,279 shares. The largest 10 holders included SUMMIT PARTNERS L P, VANGUARD GROUP INC, BlackRock Inc., FIRST TRUST ADVISORS LP, ALLIANCEBERNSTEIN L.P., RENAISSANCE TECHNOLOGIES LLC, Legal & General Group Plc, Bank of New York Mellon Corp, MILLENNIUM MANAGEMENT LLC, and STATE STREET CORP. This page lists 175 institutional shareholders reporting positions in this security for the Q4 2021 filing period.

Investor	Option	Weight %	Change %	Value $	* Price	Shares	Share Change	Activity	Report Period

Compare Q4 2021 vs Q3 2021 Across Filers

Q3 2021 holders

149

Q4 2021 holders

174

Holder diff

Investor	Q3 2021 Shares	Q4 2021 Shares	Share Diff	Share Chg %	Q3 2021 Value $	Q4 2021 Value $	Value Diff $	Value Chg %

Trend: ostatnie 8 kwartałów (+ wybrane okresy porównania).

Quarterly Holders Trend

Quarterly Value Trend

Quarterly Shares Trend

* Reported Price is the price of the security as of the portfolio date. This value is significant in that it is the last known price at which the security was still held.
An asterisk sign (*) next to the price indicates that the price is likely invalid.