SCHEDULE 13G

CUSIP No.

1

Names of Reporting Persons

The Lincoln National Life Insurance Company

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

INDIANA

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 80,000.00
7	Sole Dispositive Power 560,000.00
8	Shared Dispositive Power 80,000.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

640,000.00

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)

10.6 %

12

Type of Reporting Person (See Instructions)

IC

Comment for Type of Reporting Person: The amount reported includes 80,000 Series H Mandatory Redeemable Preferred Shares held of record by Lincoln Life & Annuity Company of New York, an affiliate of the Reporting Person under common ownership by Lincoln National Corporation.

SCHEDULE 13G

Item 1.

(a)

Name of issuer:

Calamos Strategic Total Return Fund

(b)

Address of issuer's principal executive offices:

2020 Calamos Court, c/o Calamos Advisors LLC, Naperville, Illinois 60563

Item 2.

(a)

Name of person filing:

This Statement is filed by The Lincoln National Life Insurance Company ("LNL"). The Series H Mandatory Redeemable Preferred Shares reported herein consist of shares held of record by LNL and by its affiliate, Lincoln Life & Annuity Company of New York ("LLANY"), a fellow subsidiary of Lincoln National Corporation under common ownership with LNL. LNL and LLANY acquired their respective Series H Mandatory Redeemable Preferred Shares pursuant to the Securities Purchase Agreement, dated as of August 26, 2026, by and among Calamos Strategic Total Return Fund and the purchasers named therein. Nomura Investment Management Advisers, a series of Nomura Investment Management Business Trust, acts as investment adviser and attorney-in-fact for each of LNL and LLANY with respect to the Series H Mandatory Redeemable Preferred Shares.

(b)

Address or principal business office or, if none, residence:

The Lincoln National Life Insurance Company: 1301 South Harrison Street, Fort Wayne, Indiana 46802. Lincoln Life & Annuity Company of New York: 120 Madison Street, Suite 1310, Syracuse, New York 13202.

(c)

Citizenship:

The Lincoln National Life Insurance Company is domiciled in the State of Indiana. Lincoln Life & Annuity Company of New York is domiciled in the State of New York.

(d)

Title of class of securities:

Series H Mandatory Redeemable Preferred Shares

(e)

CUSIP No.:

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:

640,000 shares (560,000 shares held directly by The Lincoln National Life Insurance Company and 80,000 shares held directly by Lincoln Life & Annuity Company of New York, an affiliate)

(b)

Percent of class:

10.6 %

(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:

80,000

(iii) Sole power to dispose or to direct the disposition of:

560,000

(iv) Shared power to dispose or to direct the disposition of:

80,000

Item 5.

Ownership of 5 Percent or Less of a Class.

Item 6.

Ownership of more than 5 Percent on Behalf of Another Person.

Not Applicable

Item 7.

Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.

Not Applicable

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.

The Lincoln National Life Insurance Company

Signature:	/s/ Zachary Illig
Name/Title:	Zachary Illig, Assitant Vice President
Date:	09/02/2026