UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 6-K

REPORT OF FOREIGN ISSUER
PURSUANT TO RULE 13a-16 OR 15d-16 OF
THE SECURITIES EXCHANGE ACT OF 1934

For the month of December 2025

Commission file number: 001-41972

BitFuFu Inc.

(Exact Name of Registrant as Specified in Its Charter)

7 Temasek Boulevard

Suntec Tower 1, #11-01

Singapore 038987

(Address of Principal Executive Offices)

Indicate by check mark whether the registrant files or will file annualreports under cover Form 20-F or Form 40-F.

Form 20-F  ☒       Form 40-F  ☐

INCORPORATION BY REFERENCE

This current report on Form 6-K is hereby incorporatedby reference in the registration statements of BitFuFu Inc. on Form F-3 (No.333-278207, No. 333-286356and No.333-288554), to the extentnot superseded by documents or reports subsequently filed or furnished.

EXHIBIT INDEX

SIGNATURE

Pursuant to the requirements ofthe Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereuntoduly authorized.

2

Exhibit 99.1

BitFuFu Announces November 2025 Bitcoin Productionand Operational Updates

SINGAPORE, December 5, 2025 (GLOBE NEWSWIRE) — BitFuFu Inc. (“BitFuFu”or the “Company”) (NASDAQ: FUFU), a world-leading Bitcoin miner and mining services innovator, today announced its unauditedproduction and mining operational updates for November 2025.

“Over the past month we accelerated sales of legacy S19 seriesminers and are replacing them with next-generation S21 miners. The transition created a temporary dip in total hashrate under management,but our upgrade plan is on track and positions us to mine more efficiently going forward,” said Leo Lu, Chairman and CEO of BitFuFu.

“In parallel, we have taken a deliberately conservative approachto third-party hash-rate purchases, avoiding higher-cost commitments while Bitcoin prices are under pressure. Our priority is to remainprofitable across bull and bear markets, and we continue to see a very compelling long-term outlook for Bitcoin. We are also advancingopportunities to expand our hash-rate footprint globally, which we believe can further diversify our cost base and support future growth.”

November 2025 Highlights (as of November 30, 2025)

Bitcoin Holdings and Production:

Consistent with its disciplined treasury practices, the Company opportunisticallysold 205 BTC in November 2025 at an average price of $107,000 to fund supplier obligations and prudently manage risk amid temporary marketvolatility.

Hashrate Overview:

BitFuFu Announces November 2025 BitcoinMining and Operational Updates

Power and Infrastructure:

Mining Services:

Upcoming Conferences:

BitFuFu will be attending the following upcoming conferences.

About BitFuFu Inc.

BitFuFu Inc. is a world-leading Bitcoin miner and mining services innovator.BitFuFu is committed to empowering the global Bitcoin network through its industry-leading cloud mining platform, rapidly scaling infrastructure,and innovative mining services.

For more information, visit ir.bitfufu.com or follow BitFuFu on X @BitFuFuOfficial.

Forward-Looking Statements

This press release includes “forward-looking statements”within the meaning of the “safe harbor” provisions of the United States Private Securities Litigation Reform Act of 1995.Forward-looking statements may be identified by the use of words such as “estimate,” “plan,” “project,”“forecast,” “intend,” “will,” “expect,” “anticipate,” “believe,”“seek,” “target” or other similar expressions that predict or indicate future events or trends. Statements thatare not historical facts, including statements about the Company’s beliefs and expectations, are forward-looking statements. Thesestatements are based on various assumptions, whether or not identified in this press release, and on the current expectations of BitFuFu’smanagement and are not predictions of actual performance. These statements involve risks, uncertainties and other factors that may causeBitFuFu’s actual results, levels of activity, performance, or achievements to be materially different from those expressed or impliedby these forward-looking statements. Although the Company believes that it has a reasonable basis for each forward-looking statement containedin this press release, the Company cautions you that these statements are based on a combination of facts and factors currently knownand projections of the future, which are inherently uncertain. All information provided in this press release is as of the date of thispress release and the Company does not undertake any duty to update such information, except as required under applicable law.

Investor Contact:

BitFuFu Investor Relations

ir@bitfufu.com

Charley Brady

Vice President, Investor Relations:

charley.b@bitfufu.com

Media Contact:

BitFuFu Media Relations

pr@bitfufu.com