Company: APM
Filing Date: 2025-10-16
Form Type: 6-K
Source: 0001213900-25-099575
Chunk: 0

Company: Aptorum Group Ltd
Filing Date: 2025-10-16
Form: 6-K
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<div align='center'>UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER

PURSUANT TO RULE 13a-16 OR 15d-16

UNDER THE SECURITIES EXCHANGE ACT OF 1934

For the month of October 2025

Commission File Number: 001-38764

APTORUM GROUP LIMITED

17 Hanover Square

London W1S 1BN, United Kingdom

(Address of principal executive offices)</div>

Indicate by check mark whether the registrant
files or will file annual reports under cover of Form 20-F or Form 40-F:

<div align='center'>Form 20-F ☒ Form
40-F ☐</div>

Registered Direct Offering

On October 10, 2025, Aptorum Group Limited (the
“Company”) entered into certain securities purchase agreement (the “Purchase Agreement”) with certain
non-affiliated institutional investors (the “Purchasers”) pursuant to which the Company agreed to sell (1) 1,000,000
Class A ordinary shares (the “Ordinary Shares”), and (2) in a concurrent private placement, restricted warrants to
purchase an aggregate of up to 2,000,000 Ordinary Shares (the “Restricted Warrants”), for aggregate gross proceeds
of approximately $2 million (the “Offering”).

Each Restricted Warrant is exercisable immediately
as of the date of issuance at an exercise price of $2.00 per Ordinary Share and expires twenty-four months from the effective date of
a registration statement registering for resale the Ordinary Shares underlying the Restricted Warrants. The Restricted Warrants and the
Ordinary Shares issuable upon the exercise of the warrants are not being registered under the Securities Act of 1933, as amended (the
“Securities Act”) and are being offered pursuant to an exemption from the registration requirements of the Securities
Act provided in Section 4(a)(2) of the Securities Act and/or Rule 506(b) of Regulation D.

The Company agreed in the Purchase Agreement that
it would not issue any Ordinary Shares, or Ordinary Share Equivalents for thirty (30) calendar days following the closing of the Offering,
subject to certain exceptions.

Concurrently with the execution of the Purchase
Agreement, the officers and directors of the Company entered into lock-up agreements (the “Lock-Up Agreement”) pursuant to which they have