Tether entities report 19.7% Bitdeer (BTDR) stake after internal share transfer

Rhea-AI Filing Summary

Tether-affiliated entities updated their ownership disclosure in Bitdeer Technologies Group. The filing states that the reporting persons together beneficially own 37,729,510 Class A shares, representing 19.7% of Bitdeer’s outstanding Class A shares, based on 191,152,162 shares outstanding as of December 31, 2025.

Effective June 12, 2026, Tether Investments, S.A. de C.V. transferred 37,729,510 Class A shares to Tether International, S.A. de C.V. The amendment explains that this intra-group transfer did not change the aggregate number of Bitdeer shares beneficially owned by the reporting group.

Key Figures

Beneficial ownership: 37,729,510 Class A shares Ownership percentage: 19.7% Shares outstanding baseline: 191,152,162 Class A shares +2 more

5 metrics

Beneficial ownership 37,729,510 Class A shares Aggregate Bitdeer shares beneficially owned by reporting persons

Ownership percentage 19.7% Portion of Bitdeer Class A shares beneficially owned

Shares outstanding baseline 191,152,162 Class A shares Shares outstanding as of December 31, 2025

Internal transfer size 37,729,510 Class A shares Transferred from Tether Investments to Tether International on June 12, 2026

Amendment number Amendment No. 13 Latest amendment to the Bitdeer Schedule 13D

Key Terms

beneficially own, shared voting power, dispositive power, Schedule 13D, +1 more

5 terms

beneficially own financial

"The Reporting Persons beneficially own an aggregate of 37,729,510 of the Issuer's Class A Shares"

Beneficially own means having the economic rights and risks of a security—such as the right to receive dividends, sell the shares, or profit from price changes—whether or not your name appears on the official share register. Think of it like renting a car: you use it and reap the benefits even if the title lists someone else. Investors care because beneficial ownership determines who truly controls value, must be disclosed under securities rules, and can signal potential influence or trading activity that affects a stock’s price.

shared voting power financial

"Each of the Reporting Persons (other than Tether Investments) has shared voting and dispositive power"

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.

dispositive power financial

"has shared voting and dispositive power with respect to 37,729,510 of the Issuer's Class A Shares"

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.

Schedule 13D regulatory

"This statement on amends the of Tether Holdings Limited ... with respect to the Class A ordinary shares"

A Schedule 13D is a legal document that investors file with regulators when they buy a large enough stake in a company to potentially influence its management or decisions. It provides details about the investor’s intention, ownership stake, and plans, helping other investors understand who is gaining control and what their motives might be.

pecuniary interest financial

"The reporting person disclaims beneficial ownership of these shares except to the extent of the reporting person's pecuniary interest"

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Available on EDGAR 06/30/2026 - 03:42 PM Accepted by SEC EDGAR 06/30/2026 - 03:41 PM Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13D

Under the Securities Exchange Act of 1934

(Amendment No. 13)

BITDEER TECHNOLOGIES GROUP

(Name of Issuer)

Class A ordinary shares, par value $0.0000001 per share

(Title of Class of Securities)

G11448100

(CUSIP Number)

Tether Global Investments Fund
Final Av. La Revolucion, Edif. Centro, Corporativo Presidente Plaza, Nivel 12
San Salvador, H3, 00000
4420 4621 1793

Daniel Woodard
McDermott Will & Schulte LLP, One Vanderbilt Avenue
New York, NY, 10017
(212) 547-5400

(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)

06/12/2026

(Date of Event Which Requires Filing of This Statement)

If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of §§ 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box.

The information required on the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

schemaVersion:

SCHEDULE 13D

CUSIP Number(s): G11448100

1

Name of reporting person

Tether Global Investments Fund, S.I.C.A.F., S.A.

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

WC

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

EL SALVADOR

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 0.00
8	Shared Voting Power 37,729,510.00
9	Sole Dispositive Power 0.00
10	Shared Dispositive Power 37,729,510.00

11

Aggregate amount beneficially owned by each reporting person

37,729,510.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

19.7 %

14

Type of Reporting Person (See Instructions)

CO

Comment for Type of Reporting Person:

Note in relation to Items 8, 10 and 11: Includes 37,729,510 Class A ordinary shares, par value $0.0000001 per share ("Class A Shares") of Bitdeer Technologies Group held by Tether International, S.A. de C.V., a wholly owned subsidiary of Tether Global Investments Fund, S.I.C.A.F., S.A. Note in relation to Item 13: This percentage is calculated based upon 191,152,162 Class A Shares outstanding on December 31, 2025, as reported in the Issuer's Annual Report of Form 20-F filed with the Securities and Exchange Commission on April 30, 2026.

SCHEDULE 13D

CUSIP Number(s): G11448100

1

Name of reporting person

Tether Investments, S.A. de C.V.

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

WC

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

EL SALVADOR

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 0.00
8	Shared Voting Power 0.00
9	Sole Dispositive Power 0.00
10	Shared Dispositive Power 0.00

11

Aggregate amount beneficially owned by each reporting person

0.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

0 %

14

Type of Reporting Person (See Instructions)

CO

SCHEDULE 13D

CUSIP Number(s): G11448100

1

Name of reporting person

Tether International, S.A. de C.V.

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

WC

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

EL SALVADOR

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 0.00
8	Shared Voting Power 37,729,510.00
9	Sole Dispositive Power 0.00
10	Shared Dispositive Power 37,729,510.00

11

Aggregate amount beneficially owned by each reporting person

37,729,510.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

19.7 %

14

Type of Reporting Person (See Instructions)

CO

Comment for Type of Reporting Person:

Note in relation to Item 13: This percentage is calculated based upon 191,152,162 Class A Shares outstanding on December 31, 2025, as reported in the Issuer's Annual Report of Form 20-F filed with the Securities and Exchange Commission on April 30, 2026.

SCHEDULE 13D

CUSIP Number(s): G11448100

1

Name of reporting person

Giancarlo Devasini

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

WC

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

ITALY

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 0.00
8	Shared Voting Power 37,729,510.00
9	Sole Dispositive Power 0.00
10	Shared Dispositive Power 37,729,510.00

11

Aggregate amount beneficially owned by each reporting person

37,729,510.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

19.7 %

14

Type of Reporting Person (See Instructions)

IN

Comment for Type of Reporting Person:

Note in relation to Items 8, 10 and 11: Includes 37,729,510 Class A Shares held by Tether International, S.A. de C.V., a wholly owned subsidiary of Tether Global Investments Fund, S.I.C.A.F., S.A. Mr. Devasini has a greater than 50% voting interest in Tether Global Investments Fund, S.I.C.A.F., S.A. The reporting person disclaims beneficial ownership of these shares except to the extent of the reporting person's pecuniary interest. Note in relation to Item 13: This percentage is calculated based upon 191,152,162 Class A Shares outstanding on December 31, 2025, as reported in the Issuer's Annual Report of Form 20-F filed with the Securities and Exchange Commission on April 30, 2026.

SCHEDULE 13D

Item 1.	Security and Issuer
(a)	Title of Class of Securities: Class A ordinary shares, par value $0.0000001 per share
(b)	Name of Issuer: BITDEER TECHNOLOGIES GROUP
(c)	Address of Issuer's Principal Executive Offices: 08 Kallang Avenue, Aperia Tower 1, #09-03/04, Singapore, SINGAPORE , 339509.
Item 1 Comment: This statement on Schedule 13D amends the Schedule 13D of Tether Holdings Limited, a British Virgin Islands business company, Tether International Limited, a British Virgin Islands business company, Ludovicus Jan Van der Velde and Giancarlo Devasini that was originally filed with the Securities and Exchange Commission on June 6, 2024, as amended by Amendment No. 1 filed on August 8, 2024, Amendment No. 2 filed on September 3, 2024, Amendment No. 3 filed on November 7, 2024, Amendment No. 4 filed on January 22, 2025, Amendment No. 5 filed on March 17, 2025, Amendment No. 6 filed on April 8, 2025, Amendment No. 7 filed on April 15, 2025, Amendment No. 8 filed on April 23, 2025, Amendment No. 9 filed on November 10, 2025, Amendment No. 10 filed on November 25, 2025, Amendment No. 11 filed on February 20, 2026 and Amendment No. 12 filed on June 16, 2026 (as amended, the "Schedule 13D") with respect to the Class A ordinary shares, par value $0.0000001 per share ("Class A Shares") of Bitdeer Technologies Group, an exempted company incorporated in the Cayman Islands (the "Issuer"). This amendment to the Schedule 13D is being filed by Tether Global Investments Fund, S.I.C.A.F., S.A. (f/k/a Tether Holdings, S.A. de C.V. and Tether Holdings Limited), an El Salvador entity, Tether Investments, S.A. de C.V. (f/k/a Tether Investments Limited), an El Salvador entity ("Tether Investments"), Tether International, S.A. de C.V., an El Salvador entity, and Giancarlo Devasini (collectively, the "Reporting Persons") and constitutes Amendment No.13 to the Schedule 13D. Capitalized terms used but not defined herein have the meanings given to such terms in the Schedule 13D. This Amendment No. 13 to Schedule 13D is being filed solely to correct an inadvertent understatement of the number of Class A Shares that Tether Investments transferred to Tether International, S.A. de C.V. as described in Item 4 of Amendment No. 12 to Schedule 13D filed by the Reporting Persons on June 16, 2026. Except as set forth herein, the Schedule 13D is unmodified.
Item 4.	Purpose of Transaction
	Effective on June 12, 2026, Tether Investments transferred 37,729,510 Class A Shares to Tether International, S.A. de C.V. (the "Transfer"). The Transfer resulted in no change in the aggregate number of Class A Shares beneficially owned by the Reporting Persons.
Item 5.	Interest in Securities of the Issuer
(a)	The Reporting Persons beneficially own an aggregate of 37,729,510 of the Issuer's Class A Shares, representing 19.7% of the outstanding Class A Shares. This percentage is calculated based upon 191,152,162 Class A Shares outstanding on December 31, 2025, as reported in the Issuer's Annual Report of Form 20-F filed with the Securities and Exchange Commission on April 30, 2026.
(b)	Each of the Reporting Persons (other than Tether Investments) has shared voting and dispositive power with respect to 37,729,510 of the Issuer's Class A Shares.
(c)	Schedule B sets forth the transactions in the Class A Shares (other than the Transfer) effected by the Reporting Persons in the last 60 days.
(d)	None.
(e)	Not applicable.
Item 7.	Material to be Filed as Exhibits.
	Schedule A - Executive Officers and Directors Schedule B - Transactions in Class A Shares Exhibit 1 - Agreement of filing persons relating to filing of joint statement per Rule 13d-1(k).

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.

Tether Global Investments Fund, S.I.C.A.F., S.A.

Signature:	/s/ Omar Rossi
Name/Title:	Omar Rossi, Sole Administrator
Date:	06/30/2026

Tether Investments, S.A. de C.V.

Signature:	/s/ Giancarlo Devasini
Name/Title:	Giancarlo Devasini, Sole Administrator
Date:	06/30/2026

Tether International, S.A. de C.V.

Signature:	/s/ Giancarlo Devasini
Name/Title:	Giancarlo Devasini, Sole Administrator
Date:	06/30/2026

Giancarlo Devasini

Signature:	/s/ Giancarlo Devasini
Name/Title:	Giancarlo Devasini, individually
Date:	06/30/2026

FAQ

How many Bitdeer (BTDR) shares do the Tether reporting persons beneficially own?

The reporting persons beneficially own 37,729,510 Bitdeer Class A shares. This stake represents 19.7% of the company’s outstanding Class A shares, based on 191,152,162 shares outstanding as of December 31, 2025, as cited in the filing.

What percentage of Bitdeer’s Class A shares is held by the Tether group?

The filing reports a 19.7% beneficial ownership of Bitdeer’s Class A shares. This percentage is calculated using 191,152,162 shares outstanding as of December 31, 2025, as disclosed in Bitdeer’s Form 20-F filed on April 30, 2026.

What transaction occurred between Tether Investments and Tether International regarding Bitdeer (BTDR) shares?

On June 12, 2026, Tether Investments, S.A. de C.V. transferred 37,729,510 Bitdeer Class A shares to Tether International, S.A. de C.V. The filing states this intra-group transfer did not change the aggregate number of Bitdeer shares beneficially owned by the reporting persons.

Did the Amendment No. 13 to the Bitdeer (BTDR) Schedule 13D change total ownership?

The amendment did not change total beneficial ownership. It clarifies that, after the June 12, 2026 transfer of 37,729,510 shares within Tether-affiliated entities, the reporting persons still beneficially own the same aggregate number of Bitdeer Class A shares.

Why was Amendment No. 13 to the Bitdeer (BTDR) Schedule 13D filed?

Amendment No. 13 was filed to correct an inadvertent understatement of the number of Bitdeer Class A shares transferred from Tether Investments to Tether International. The correction relates to a transfer previously described in Amendment No. 12 and does not alter aggregate beneficial ownership figures.

What role does Giancarlo Devasini have in the Bitdeer (BTDR) shareholding structure?

The filing reports that Giancarlo Devasini has shared voting and dispositive power over 37,729,510 Bitdeer Class A shares through Tether entities. It notes he holds a greater than 50% voting interest in Tether Global Investments Fund and disclaims beneficial ownership except for his pecuniary interest.