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 Q1 2021?

133 institutional investors reported ATEN - A10 Networks, Inc. - Common Stock for Q1 2021. Use the holders table for investor-level position and value details.

A10 Networks, Inc. - Common Stock (ATEN)

CUSIP: 002121101

Q1 2021 13F Holders as of 31 Mar 2021

Type / Class: Equity / Common Stock
Shares outstanding: 77,603,290
Total 13F shares: 65,708,350
Share change: +3,024,247
Total reported value: $630,499,637
Put/Call ratio: 42%
Price per share: $9.61
Number of holders: 133
Value change: +$28,739,618
Number of buys: 66
Number of sells: 81

Quarterly Holders Quick Answers

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

Need full ownership history?
Open the full security ownership history page.

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: Q2 2021
Previous quarter: Q4 2020

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%	9,539,076	$94,055,000	—	31 Dec 2020	13F
VIEX Capital Advisors, LLC	13F	Company	9.9%	7,691,096	$75,834,000	—	31 Dec 2020	13F
BlackRock Finance, Inc.	13F	Company	7.1%	5,530,552	$54,531,000	—	31 Dec 2020	13F
VANGUARD GROUP INC	13F	Company	5.6%	4,364,807	$43,037,000	—	31 Dec 2020	13F
Legal & General Group Plc	13F	Company	5.2%	4,070,056	$40,131,000	—	31 Dec 2020	13F
RENAISSANCE TECHNOLOGIES LLC	13F	Company	5%	3,893,972	$38,395,000	—	31 Dec 2020	13F
ETF MANAGERS GROUP, LLC	13F	Company	3.3%	2,592,817	$25,461,000	—	31 Dec 2020	13F
ALLIANCEBERNSTEIN L.P.	13F	Company	2.1%	1,621,098	$15,984,000	—	31 Dec 2020	13F
ROYCE & ASSOCIATES LP	13F	Company	2%	1,559,897	$15,381,000	—	31 Dec 2020	13F
STATE STREET CORP	13F	Company	1.9%	1,489,578	$14,687,000	—	31 Dec 2020	13F
JACOBS LEVY EQUITY MANAGEMENT, INC	13F	Company	1.6%	1,278,126	$12,602,000	—	31 Dec 2020	13F
FIRST TRUST ADVISORS LP	13F	Company	1.5%	1,140,665	$11,247,000	—	31 Dec 2020	13F
TWO SIGMA INVESTMENTS, LP	13F	Company	1.3%	993,870	$9,800,000	—	31 Dec 2020	13F
GEODE CAPITAL MANAGEMENT, LLC	13F	Company	1.1%	874,475	$8,621,000	—	31 Dec 2020	13F
TWO SIGMA ADVISERS, LP	13F	Company	1.1%	861,700	$8,496,000	—	31 Dec 2020	13F
ARROWSTREET CAPITAL, LIMITED PARTNERSHIP	13F	Company	1%	798,540	$7,874,000	—	31 Dec 2020	13F
NORTHERN TRUST CORP	13F	Company	0.87%	677,653	$6,681,000	—	31 Dec 2020	13F
CHARLES SCHWAB INVESTMENT MANAGEMENT INC	13F	Company	0.8%	618,166	$6,096,000	—	31 Dec 2020	13F
Penserra Capital Management LLC	13F	Company	0.71%	553,954	$5,461,000	—	31 Dec 2020	13F
Assenagon Asset Management S.A.	13F	Company	0.65%	506,474	$4,994,000	—	31 Dec 2020	13F
Hillsdale Investment Management Inc.	13F	Company	0.64%	499,623	$4,927,000	—	31 Dec 2020	13F
LOS ANGELES CAPITAL MANAGEMENT LLC	13F	Company	0.58%	452,656	$4,463,000	—	31 Dec 2020	13F
PRUDENTIAL FINANCIAL INC	13F	Company	0.55%	427,801	$4,218,000	—	31 Dec 2020	13F
BNP PARIBAS FINANCIAL MARKETS	13F	Company	0.5%	390,655	$3,851,858	—	31 Dec 2020	13F
Russell Investments Group, Ltd.	13F	Company	0.47%	367,051	$3,616,000	—	31 Dec 2020	13F
MORGAN STANLEY	13F	Company	0.47%	362,529	$3,575,000	—	31 Dec 2020	13F
DIMENSIONAL FUND ADVISORS LP	13F	Company	0.46%	359,430	$3,544,000	—	31 Dec 2020	13F
Nuveen Asset Management, LLC	13F	Company	0.43%	329,818	$3,252,000	—	31 Dec 2020	13F
JPMORGAN CHASE & CO	13F	Company	0.42%	326,874	$3,223,000	—	31 Dec 2020	13F
Bank of New York Mellon Corp	13F	Company	0.4%	311,410	$3,070,000	—	31 Dec 2020	13F
Man Group plc	13F	Company	0.4%	311,205	$3,069,000	—	31 Dec 2020	13F
AQR CAPITAL MANAGEMENT LLC	13F	Company	0.4%	307,443	$3,031,000	—	31 Dec 2020	13F
MACKAY SHIELDS LLC	13F	Company	0.39%	299,500	$2,953,000	—	31 Dec 2020	13F
WELLS FARGO & COMPANY/MN	13F	Company	0.38%	291,391	$2,873,000	—	31 Dec 2020	13F
FULLER & THALER ASSET MANAGEMENT, INC.	13F	Company	0.37%	289,720	$2,857,000	—	31 Dec 2020	13F
SUSQUEHANNA INTERNATIONAL GROUP, LLP	13F	Company	0.37%	286,753	$2,827,000	—	31 Dec 2020	13F
CITADEL ADVISORS LLC	13F	Company	0.35%	273,283	$2,695,000	—	31 Dec 2020	13F
Mirae Asset Global Investments Co., Ltd.	13F	Company	0.34%	264,759	$2,611,000	—	31 Dec 2020	13F
GOLDMAN SACHS GROUP INC	13F	Company	0.34%	261,352	$2,577,000	—	31 Dec 2020	13F
Walthausen & Co., LLC	13F	Company	0.32%	250,520	$2,470,000	—	31 Dec 2020	13F
PARADIGM CAPITAL MANAGEMENT INC/NY	13F	Company	0.29%	227,600	$2,245,000	—	31 Dec 2020	13F
GLOBEFLEX CAPITAL L P	13F	Company	0.29%	222,074	$2,190,000	—	31 Dec 2020	13F
PARAMETRIC PORTFOLIO ASSOCIATES LLC	13F	Company	0.27%	208,641	$2,057,000	—	31 Dec 2020	13F
CITIGROUP INC	13F	Company	0.27%	206,753	$2,039,000	—	31 Dec 2020	13F
Worth Venture Partners, LLC	13F	Company	0.22%	171,376	$1,690,000	—	31 Dec 2020	13F
IQ EQ FUND MANAGEMENT (IRELAND) Ltd	13F	Company	0.2%	153,158	$1,510,000	—	31 Dec 2020	13F
Squarepoint Ops LLC	13F	Company	0.19%	150,328	$1,482,000	—	31 Dec 2020	13F
PANAGORA ASSET MANAGEMENT INC	13F	Company	0.19%	147,248	$1,452,000	—	31 Dec 2020	13F
COOPER CREEK PARTNERS MANAGEMENT LLC	13F	Company	0.18%	143,240	$1,412,000	—	31 Dec 2020	13F
CALIFORNIA PUBLIC EMPLOYEES RETIREMENT SYSTEM	13F	Company	0.18%	136,336	$1,344,000	—	31 Dec 2020	13F

Institutional Holders of A10 Networks, Inc. - Common Stock (ATEN) as of Q1 2021

As of 31 Mar 2021, A10 Networks, Inc. - Common Stock (ATEN) was held by 133 institutional shareholders that filed Form 13F with the SEC. Together, they reported ownership of 65,708,350 shares. The largest 10 holders included SUMMIT PARTNERS L P, VIEX Capital Advisors, LLC, BlackRock Inc., VANGUARD GROUP INC, Legal & General Group Plc, RENAISSANCE TECHNOLOGIES LLC, ETF MANAGERS GROUP, LLC, ALLIANCEBERNSTEIN L.P., ROYCE & ASSOCIATES LP, and FIRST TRUST ADVISORS LP. This page lists 133 institutional shareholders reporting positions in this security for the Q1 2021 filing period.

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

Compare Q1 2021 vs Q4 2020 Across Filers

Q4 2020 holders

144

Q1 2021 holders

133

Holder diff

-11

Investor	Q4 2020 Shares	Q1 2021 Shares	Share Diff	Share Chg %	Q4 2020 Value $	Q1 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.