BlackRock unit reports 100% stake in CGO Series H

A BlackRock-affiliated entity reports shared beneficial ownership of 360,000 Series H preferred shares of CALAMOS GLOBAL TOTAL RETURN FUND, representing 100% of that class.

Rhea-AI Filing Summary

CALAMOS GLOBAL TOTAL RETURN FUND (CGO) reports that BlackRock Portfolio Management LLC has filed a Schedule 13G regarding the fund’s Series H Mandatory Redeemable Preferred Shares. BlackRock Portfolio Management LLC may be deemed to share beneficial ownership of 360,000 Series H preferred shares, representing 100% of this preferred share class, with shared voting and dispositive power over all such shares and no sole power.

The reporting entity is organized in Delaware and acts on behalf of certain business units of BlackRock, Inc. Various underlying persons have rights to dividends or sale proceeds from these shares, including The Guardian Life Insurance Company of America, The Guardian Insurance & Annuity Company, Inc., and Midland National Life Insurance Company.

Key Figures

Series H preferred shares beneficially owned: 360,000 shares Percent of Series H preferred class: 100% Shared voting power: 360,000 shares +1 more

4 metrics

Series H preferred shares beneficially owned 360,000 shares Series H Mandatory Redeemable Preferred Shares beneficially owned by the reporting person

Percent of Series H preferred class 100% Percentage of the Series H Mandatory Redeemable Preferred Shares outstanding

Shared voting power 360,000 shares Shares over which the reporting person has shared power to vote or direct the vote

Shared dispositive power 360,000 shares Shares over which the reporting person has shared power to dispose or direct disposition

Key Terms

beneficial ownership, Series H Mandatory Redeemable Preferred Shares, Schedule 13G, dispositive power, +2 more

6 terms

beneficial ownership financial

"may be deemed to share beneficial ownership of 360,000 shares of the Issuer"

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.

Series H Mandatory Redeemable Preferred Shares financial

"Title of class of securities: Series H Mandatory Redeemable Preferred Shares"

Schedule 13G regulatory

"This statement is filed on behalf of BlackRock Portfolio Management LLC"

A Schedule 13G is a formal document that investors file with the government when they acquire a large ownership stake in a company, usually for investment purposes rather than control. It helps keep the public informed about who owns significant parts of a company's shares, which can influence how the company is managed and how investors make decisions. Filing this schedule is important for transparency and understanding the ownership landscape of publicly traded companies.

dispositive power financial

"Shared Dispositive Power 360,000.00"

Dispositive power is the authority to decide the final outcome of an asset, legal claim, contract, or corporate action — in effect the power to dispose of or resolve something. For investors it matters because whoever holds that authority can determine who gets paid, who controls an asset or vote, and how risks and returns are allocated; think of it like holding the key that lets you lock in the winner or loser in a deal.

Power of Attorney regulatory

"Exhibit 24.1: Power of Attorney"

A power of attorney is a legal document that allows one person to make decisions and act on behalf of another person, often in financial or legal matters. It’s like giving someone a trusted helper or agent the authority to handle important tasks if you are unable to do so yourself. This matters to investors because it can impact how their assets are managed or transferred if they become unable to oversee their affairs.

Investment Company Act of 1940 regulatory

"A listing of the shareholders of an investment company registered under the Investment Company Act of 1940"

A U.S. federal law that sets the rulebook for pooled investment vehicles such as mutual funds, exchange-traded funds and similar money managers, requiring them to register with regulators, disclose holdings and fees, limit conflicts of interest, and follow governance standards. It matters to investors because these protections and transparency rules act like a referee and scoreboard, helping people compare funds, trust that managers follow fair practices, and spot hidden costs or risks.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What ownership in CGO’s Series H preferred shares does BlackRock Portfolio Management LLC report?

BlackRock Portfolio Management LLC may be deemed to share beneficial ownership of 360,000 Series H Mandatory Redeemable Preferred Shares of CALAMOS GLOBAL TOTAL RETURN FUND, representing 100% of that preferred share class, with shared voting and dispositive power over all such shares.

What percentage of CGO’s Series H Mandatory Redeemable Preferred Shares is owned?

The filing states that the reporting person’s beneficial ownership of 360,000 Series H Mandatory Redeemable Preferred Shares represents 100% of the outstanding Series H preferred share class of CALAMOS GLOBAL TOTAL RETURN FUND.

Does BlackRock Portfolio Management LLC have sole or shared voting power over CGO’s Series H shares?

The reporting person has no sole voting power and shared voting power over 360,000 Series H Mandatory Redeemable Preferred Shares. It likewise has no sole dispositive power and shared dispositive power over 360,000 shares.

Which entities may receive dividends or sale proceeds from CGO shares referenced in this Schedule 13G?

The filing states that various persons may receive dividends or sale proceeds, and identifies three with interests over 5%: The Guardian Life Insurance Company of America, The Guardian Insurance & Annuity Company, Inc., and Midland National Life Insurance Company.

What is the relationship of BlackRock Portfolio Management LLC to BlackRock, Inc. in this CGO filing?

The statement is filed on behalf of BlackRock Portfolio Management LLC and reflects securities beneficially owned, or deemed beneficially owned, by certain business units of BlackRock, Inc. and its subsidiaries and affiliates, excluding other disaggregated business units.

Where is the reporting person in the CGO Schedule 13G organized and located?

BlackRock Portfolio Management LLC is organized under the laws of Delaware. Its business address is given as 50 Hudson Yards, New York, NY 10001 in the Schedule 13G relating to CALAMOS GLOBAL TOTAL RETURN FUND.

AI-generated analysis. How Rhea-AI works. Not financial advice.

See more from StockTitan in Google Search and AI answers. Adds StockTitan as a preferred source · opens Google

Add on Google Not now

Available on EDGAR 09/08/2026 - 04:31 PM Accepted by SEC EDGAR 09/08/2026 - 04:30 PM Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

Calamos Global Total Return Fund

(Name of Issuer)

Series H Mandatory Redeemable Preferred Shares

(Title of Class of Securities)

128118*73

(CUSIP Number)

08/31/2026

(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): 128118*73

1

Names of Reporting Persons

BlackRock Portfolio Management LLC

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

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 360,000.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 360,000.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

360,000.00

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)

100 %

12

Type of Reporting Person (See Instructions)

HC

SCHEDULE 13G

Item 1.
(a)	Name of issuer: Calamos Global Total Return Fund
(b)	Address of issuer's principal executive offices: 2020 Calamos Court, Naperville, IL 60563
Item 2.
(a)	Name of person filing: This statement is filed on behalf of BlackRock Portfolio Management LLC (the "Reporting Person"). In accordance with SEC Release No. 34-39538 (January 12, 1998), this Schedule 13G reflects the securities beneficially owned, or deemed to be beneficially owned, by certain business units (collectively, the "Reporting Business Units") of BlackRock, Inc. and its subsidiaries and affiliates. It does not include securities, if any, beneficially owned by other business units whose beneficial ownership of securities are disaggregated from that of the Reporting Business Units in accordance with such release.
(b)	Address or principal business office or, if none, residence: The business address of the Reporting Person is 50 Hudson Yards, New York, NY 10001.
(c)	Citizenship: The Reporting Person is organized under the laws of the State of Delaware.
(d)	Title of class of securities: Series H Mandatory Redeemable Preferred Shares
(e)	CUSIP Number(s): 128118*73
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: The Reporting Person may be deemed to share beneficial ownership of 360,000 shares of the Issuer's Series H Mandatory Redeemable Preferred Shares. The percentage reflected herein is based on 360,000 Series H Mandatory Redeemable Preferred Shares outstanding.
(b)	Percent of class: 100%
(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: 360,000
	(iii) Sole power to dispose or to direct the disposition of: 0
	(iv) Shared power to dispose or to direct the disposition of: 360,000
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. Various persons have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of the shares of Calamos Global Total Return Fund. No one person's interest in the shares of Calamos Global Total Return Fund is more than five percent of the total outstanding shares, except for (i) The Guardian Life Insurance Company of America, (ii) The Guardian Insurance & Annuity Company, Inc., and (iii) Midland National Life Insurance Company.
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 Exhibit 99.1
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.

BlackRock Portfolio Management LLC

Signature:	/s/ Joseph Virgilio
Name/Title:	Joseph Virgilio, Attorney-in-fact
Date:	09/08/2026

Exhibit Information

Exhibit 24.1: Power of Attorney Exhibit 99.1: Item 7