First Trust entities (NYSE: ATEN) disclose 6.68% beneficial stake in A10 Networks

Rhea-AI Filing Summary

First Trust Portfolios L.P., First Trust Advisors L.P. and The Charger Corporation report beneficial ownership of 4,809,261 shares of A10 Networks, Inc. common stock, representing 6.68% of the class. They report shared voting power over 3,310,470 shares and shared dispositive power over 4,809,261 shares, with no sole voting or dispositive power.

The holdings are primarily in unit investment trusts and other managed accounts, and the reporting entities disclaim beneficial ownership. Voting for unit investment trust shares is generally carried out by the trustee, not by the reporting entities.

Key Figures

Beneficially owned shares: 4,809,261 shares Percent of class: 6.68% Shared voting power: 3,310,470 shares +3 more

6 metrics

Beneficially owned shares 4,809,261 shares Total A10 Networks common shares reported as beneficially owned under Item 4(a)

Percent of class 6.68% Percentage of A10 Networks common stock class reported under Item 4(b)

Shared voting power 3,310,470 shares Number of shares with shared power to vote or direct the vote under Item 4(c)(ii)

Shared dispositive power 4,809,261 shares Number of shares with shared power to dispose or direct disposition under Item 4(c)(iv)

Sole voting power 0 shares Sole power to vote or direct the vote under Item 4(c)(i)

Sole dispositive power 0 shares Sole power to dispose or direct disposition under Item 4(c)(iii)

Key Terms

beneficial ownership, shared voting power, shared dispositive power, unit investment trusts, +2 more

6 terms

beneficial ownership financial

"Amount beneficially owned: 4,809,261 (b) Percent of class: 6.68 %"

Beneficial ownership means the person or entity that actually enjoys the benefits of owning shares or other assets — such as receiving dividends, voting rights, or price gains — even if the legal title is held in another name. For investors it matters because knowing who truly controls and profits from a company reveals who can influence decisions, exposes potential conflicts of interest or hidden concentration of power, and affects transparency and risk in the stock.

shared voting power financial

"Shared power to vote or to direct the vote: 3,310,470"

Shared voting power occurs when two or more parties jointly have the right to vote or decide how a block of company shares is cast, like co-owners who must agree before moving a piece of furniture. Investors care because who controls voting rights affects board elections, major corporate decisions and takeover outcomes, and shared control can alter regulatory disclosures and the practical influence any holder has over a company’s direction and value.

shared dispositive power financial

"Shared power to dispose or to direct the disposition of: 4,809,261"

unit investment trusts financial

"First Trust Portfolios L.P. acts as sponsor of certain unit investment trusts"

A unit investment trust (UIT) is a pooled investment that sells investors fixed “units” representing a pre-selected, unchanging bundle of stocks, bonds or other securities held for a set period. Think of it like buying a pre-packed grocery basket that won’t be rearranged — you know exactly what you own and roughly when it will end. UITs matter to investors because they offer predictable holdings and income patterns, lower active management, and clear tax and fee implications compared with regularly traded funds.

Rule 13d-1(k)(1) regulatory

"jointly filed by ... pursuant to Rule 13d-1(k)(1)"

Rule 12d1-4 regulatory

"Subject to the requirements of Rule 12d1-4 under the Investment Company Act of 1940"

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Available on EDGAR 07/30/2026 - 12:11 PM Accepted by SEC EDGAR 07/30/2026 - 12:11 PM Learn about SEC filing dates

FAQ

What percentage of A10 Networks (ATEN) does First Trust report owning?

First Trust entities report beneficial ownership of 6.68% of A10 Networks’ common stock, corresponding to 4,809,261 shares. This stake is held across unit investment trusts and other investment vehicles they manage or advise.

How many A10 Networks (ATEN) shares does First Trust report as beneficially owned?

The filing reports 4,809,261 shares of A10 Networks common stock as beneficially owned. This total underpins the disclosed 6.68% ownership of the outstanding common stock class.

Who are the reporting persons in this A10 Networks (ATEN) Schedule 13G?

The reporting persons are First Trust Portfolios L.P., First Trust Advisors L.P. and The Charger Corporation, all organized in Illinois. The Charger Corporation is the general partner of the two First Trust limited partnerships.

What voting power over A10 Networks (ATEN) shares do the First Trust entities report?

They report no sole voting power and shared voting power over 3,310,470 shares. Voting for unit investment trust shares is generally exercised by the trustee in line with instructions described in the trust documents.

What dispositive power over A10 Networks (ATEN) shares is disclosed in the 13G?

The reporting entities disclose no sole dispositive power and shared dispositive power over 4,809,261 shares. These shares are held across unit investment trusts, other registered funds, pooled vehicles and separately managed accounts.

Do the First Trust entities claim full beneficial ownership of their A10 Networks (ATEN) stake?

No. Each of First Trust Portfolios L.P., First Trust Advisors L.P. and The Charger Corporation expressly disclaims beneficial ownership of the A10 Networks shares referenced in the Schedule 13G filing.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

A10 Networks, Inc.

(Name of Issuer)

Common

(Title of Class of Securities)

002121101

(CUSIP Number)

06/30/2026

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

schemaVersion:

SCHEDULE 13G

CUSIP Number(s): 002121101

1

Names of Reporting Persons

First Trust Portfolios L.P.

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

ILLINOIS

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 1,497,852.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

4,809,261.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

6.68 %

12

Type of Reporting Person (See Instructions)

BD

SCHEDULE 13G

CUSIP Number(s): 002121101

1

Names of Reporting Persons

First Trust Advisors L.P.

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

ILLINOIS

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 3,310,470.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 4,809,261.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

4,809,261.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

6.68 %

12

Type of Reporting Person (See Instructions)

IA

SCHEDULE 13G

CUSIP Number(s): 002121101

1

Names of Reporting Persons

The Charger Corporation

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

ILLINOIS

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 3,310,470.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 4,809,261.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

4,809,261.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

6.68 %

12

Type of Reporting Person (See Instructions)

HC

SCHEDULE 13G

Item 1.
(a)	Name of issuer: A10 Networks, Inc.
(b)	Address of issuer's principal executive offices: Attn: Legal Department, 2300 Orchard Parkway, San Jose, CA 95131, USA
Item 2.
(a)	Name of person filing: First Trust Portfolios L.P. First Trust Advisors L.P. The Charger Corporation
(b)	Address or principal business office or, if none, residence: 120 East Liberty Drive, Suite 400, Wheaton, Illinois 60187
(c)	Citizenship: Illinois, USA
(d)	Title of class of securities: Common
(e)	CUSIP Number(s): 002121101
Item 3.	If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)	An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)	An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)	A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)	A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:
(k)	Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.	Ownership
(a)	Amount beneficially owned: 4,809,261
(b)	Percent of class: 6.68 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 0
	(ii) Shared power to vote or to direct the vote: 3,310,470
	(iii) Sole power to dispose or to direct the disposition of: 0
	(iv) Shared power to dispose or to direct the disposition of: 4,809,261
Item 5.	Ownership of 5 Percent or Less of a Class.
	Not Applicable
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	If any other person is known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, such securities, a statement to that effect should be included in response to this item and, if such interest relates to more than 5 percent of the class, such person should be identified. A listing of the shareholders of an investment company registered under the Investment Company Act of 1940 or the beneficiaries of employee benefit plan, pension fund or endowment fund is not required. This Schedule 13G filing is jointly filed by The Charger Corporation, First Trust Portfolios L.P. and First Trust Advisors L.P. pursuant to Rule 13d-1(k)(1). The Charger Corporation is the General Partner of both First Trust Portfolios L.P. and First Trust Advisors L.P. First Trust Portfolios L.P. acts as sponsor of certain unit investment trusts which hold shares of the issuer. The total number of shares of the issuer held by these unit investment trusts is set forth in Row (8) above with respect to First Trust Portfolios L.P. No individual unit investment trust sponsored by First Trust Portfolios L.P. holds more than 3% of any registered investment company issuer's shares. First Trust Advisors L.P., an affiliate of First Trust Portfolios L.P., acts as portfolio supervisor of the unit investment trusts sponsored by First Trust Portfolios L.P., certain of which hold shares of the issuer. Neither First Trust Portfolios L.P., First Trust Advisors L.P. nor The Charger Corporation have the power to vote the shares of the issuer held by these unit investment trusts sponsored by First Trust Portfolios L.P. These shares are voted by the trustee of such unit investment trusts so as to insure that the shares are ordinarily voted as closely as possible in the same manner and in the same general proportion as are the shares held by owners other than such unit investment trusts. Subject to the requirements of Rule 12d1-4 under the Investment Company Act of 1940 and as further explained in the Standard Terms and Conditions of Trust and related Trust Agreements of the unit investment trusts, First Trust Portfolios L.P., on behalf of the unit investment trusts, may enter into an agreement with a deposited fund which may permit the shares of such fund to be voted in the best interest of unit holders at the discretion of First Trust Portfolios L.P. The difference, if any, between the aggregate amount of shares beneficially owned by each reporting person, as set forth in Row (9) above, and the number of shares of the issuer held by the unit investment trusts sponsored by First Trust Portfolios L.P. represents shares of the issuer which are either held in other registered investment companies, pooled investment vehicles and/or separately managed accounts for which First Trust Advisors L.P. serves as investment advisor and/or investment sub-advisor. Each of First Trust Portfolios L.P., First Trust Advisors L.P. and The Charger Corporation disclaims beneficial ownership of the shares of the issuer identified in this filing.
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	If a parent holding company has filed this schedule, pursuant to Rule 13d-1(b)(ii)(G), so indicate under Item 3(g) and attach an exhibit stating the identity and the Item 3 classification of the relevant subsidiary. If a parent holding company has filed this schedule pursuant to Rule 13d-1(c) or Rule 13d-1(d), attach an exhibit stating the identification of the relevant subsidiary. See Item 6.
Item 8.	Identification and Classification of Members of the Group.
	Not Applicable
Item 9.	Notice of Dissolution of Group.
	Not Applicable

Item 10.

Certifications:

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

First Trust Portfolios L.P.

Signature:	/s/ James M. Dykas
Name/Title:	James M. Dykas, Chief Financial Officer
Date:	07/30/2026

First Trust Advisors L.P.

Signature:	/s/ James M. Dykas
Name/Title:	James M. Dykas, Chief Financial Officer
Date:	07/30/2026

The Charger Corporation

Signature:	/s/ James M. Dykas
Name/Title:	James M. Dykas, Chief Financial Officer and Treasurer
Date:	07/30/2026

Exhibit Information

Please see Exhibit 99.1 for Joint Filing Agreement