UNITED STATES
SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 8-K

CURRENT REPORT
PURSUANT TO SECTION 13 OR 15(d) OF THE
SECURITIES EXCHANGE ACT OF 1934

Date of report (Date of earliest event reported): November 14, 2025

Northwest Biotherapeutics, Inc.

(Exact name of registrant as specified in its charter)

Delaware	0-35737	94-3306718
(State or other jurisdiction	(Commission	(IRS Employer
of incorporation)	File Number)	Identification No.)

4800 Montgomery Lane, Suite 800

Bethesda, Maryland 20814

(Address of Principal Executive Offices)

(240) 497-9024

(Registrant’s telephone number, including area code)

(Former Name or Former Address, if Changed Since Last Report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

Soliciting material pursuant to Rule I 4a-I 2 under the Exchange Act (17 CFR 240.l 4a-12)

Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

Pre-commencement communications pursuant to Rule l 3e-4(c) under the Exchange Act (17 CFR 240. l 3e-4(c))

Title of each class:		Trading Symbol(s)		Name of each exchange on which registered:
Common Stock, par value, $0.001 per share		NWBO		OTCQB

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240. l 2b-2 of this chapter).

Emerging Growth Company ¨

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ¨

Item 1.01.

Entry into a Material Definitive Agreement.

Loan Entered Into

On November 14, 2025 the Company entered into a $5 million convertible Promissory Note financing (the “Note”) with YA II PN, Ltd., an investment fund managed by Yorkville Advisors Global, LP (“Yorkville”). The Company plans to use the financing proceeds for some of the construction and equipment costs for the first Grade C manufacturing suite in its Sawston, UK facility, as well as for ongoing Company operations.

The term of the Note is 12 months. No payments are due until maturity. The Note carries an Original Issue Discount of five percent but no interest. The Note includes customary default provisions. During the term of the Note, it is convertible at the option of the holder, at a small discount to the then prevailing market price. The amounts of such conversions are limited to approximately one fifth (1/5) of the overall Note amount in any given calendar month unless the conversion price is above $0.29.

Item 2.03.

Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant.

The information included in Item 1.01 of this Current Report on Form 8-K is incorporated herein by reference.

SIGNATURE

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

	NORTHWEST BIOTHERAPEUTICS, INC.

Date: November 20, 2025	By:	/s/ Linda Powers
	Name:	Linda Powers
	Title:	Chief Executive Officer and Chairman

NORTHWEST BIOTHERAPEUTICS INC 8-K