Advent Technologies (ADN) files late Q3 2025 10-Q notice

Advent Technologies Holdings, Inc. filed a Form 12b-25 to notify regulators and investors that it will not file its Quarterly Report on Form 10-Q for the period ended September 30, 2025 by the normal deadline.

Rhea-AI Filing Summary

Advent Technologies Holdings, Inc. filed a Form 12b-25 to notify regulators and investors that it will not file its Quarterly Report on Form 10-Q for the period ended September 30, 2025 by the normal deadline. The company states that, without unreasonable effort or expense, it needs more time to complete the final review of its financial statements and other disclosures in the report.

Advent explains that it is working diligently to finish the Quarterly Report as quickly as possible so that it can provide updated financial information for the quarter to the market.

Insights

Financial Reporting Analyst

Late 10-Q due to extended financial review; short grace period, no stated operational impact.

Advent Technologies Holdings, Inc. filed a Form 12b-25 to notify a late Form 10-Q for the period ended September 30, 2025. The company cites the need for more time to complete the final review of its financial statements and related disclosures, and represents that filing by this route avoids unreasonable effort or expense. Under Rule 12b-25, this notice allows up to five extra calendar days to file a quarterly report without it being deemed delinquent, if that timing is met.

The disclosure does not describe any specific accounting issue, restatement, or operational event causing the delay. It also does not provide quantitative information about results for the quarter. The company states that it is working diligently to complete the Quarterly Report as quickly as possible, which frames the delay as procedural rather than tied to a disclosed underlying change.

Key items to watch are whether the Form 10-Q is actually filed within the allowed five-day extension after the original due date and whether that report contains any significant changes in results of operations for the quarter ended September 30, 2025. The combination of a late filing and the short extension window makes the period between this notice and the eventual 10-Q filing the most relevant timeframe.

FAQ

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

Why did Advent Technologies Holdings, Inc. (ADN) file a Form 12b-25?

Advent Technologies Holdings, Inc. filed Form 12b-25 because it determined that it could not file its Quarterly Report on Form 10-Q for the period ended September 30, 2025 by the prescribed due date without unreasonable effort or expense.

Which report is Advent Technologies (ADN) delaying with this Form 12b-25?

The notice relates to Advent Technologies’ Quarterly Report on Form 10-Q for the period ended September 30, 2025.

What reason does Advent Technologies (ADN) give for the late Form 10-Q?

Advent states that it requires additional time to complete the final review of its financial statements and other disclosures in the Form 10-Q for the quarter ended September 30, 2025.

Is Advent Technologies (ADN) working to complete the delayed Form 10-Q?

Yes. The company states that it is working diligently to complete the Quarterly Report as quickly as possible.

Who signed Advent Technologies’ Form 12b-25 for the late Form 10-Q?

The notification was signed on behalf of Advent Technologies Holdings, Inc. by Gary Herman, Chief Executive Officer, dated November 14, 2025.

What period does the delayed Advent Technologies (ADN) Form 10-Q cover?

The delayed Form 10-Q covers Advent Technologies’ quarter ended September 30, 2025.

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

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Accepted by SEC EDGAR 11/14/2025 - 05:11 PM Learn about SEC filing dates

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 12b-25

NOTIFICATION OF LATE FILING

SEC File Number: 001-38742

CUSIP Number: 00165R101

(Check one):		☐  Form 10-K     ☐  Form 20-F     ☐  Form 11-K   ☒   Form 10-Q ☐  Form 10-D     ☐  Form N-CEN     ☐  Form N-CSR
		For Period Ended: September 30, 2025
		☐ Transition Report on Form 10-K
		☐ Transition Report on Form 20-F
		☐ Transition Report on Form 11-K
		☐ Transition Report on Form 10-Q
		For the Transition Period Ended: _______________

Read Instructions (on back page) Before Preparing Form. Please Print or Type.

Nothing in this form shall be construed to imply that the Commission has verified any information contained herein.

If the notification relates to a portion of the filing checked above, identify the Item(s) to which the notification relates:

PART I—REGISTRANT INFORMATION

Advent Technologies Holdings, Inc.

Full Name of Registrant

AMCI Acquisition Corp.

Former Name if Applicable

5637 La Ribera St., Suite A

Address of Principal Executive Office (Street and Number)

Livermore, CA 94550

City, State and Zip Code

PART II—RULES 12b-25(b) AND (c)

If the subject report could not be filed without unreasonable effort or expense and the registrant seeks relief pursuant to Rule 12b-25(b), the following should be completed. (Check box if appropriate)

☒	(a)	The reason described in reasonable detail in Part III of this form could not be eliminated without unreasonable effort or expense;
☐	(b)	The subject annual report, semi-annual report, transition report on Form 10-K, Form 20-F, Form 11-K, Form N-CEN or Form N-CSR, or portion thereof, will be filed on or before the fifteenth calendar day following the prescribed due date; or the subject quarterly report or transition report on Form 10-Q or subject distribution report on Form 10-D, or portion thereof, will be filed on or before the fifth calendar day following the prescribed due date; and
☐	(c)	The accountant’s statement or other exhibit required by Rule 12b-25(c) has been attached if applicable.

PART III—NARRATIVE

State below in reasonable detail the reasons why Forms 10-K, 20-F, 11-K, 10-Q, 10-D, N-CEN, N-CSR, or the transition report or portion thereof, could not be filed within the prescribed time period. (Attach extra Sheets if Needed)

Advent Technologies Holdings, Inc. (the “Company”) has determined that it is unable, without unreasonable effort or expense, to file its Quarterly Report on Form 10-Q for the period ended September 30, 2025 (the “Quarterly Report”) by the prescribed due date. The Company requires additional time to complete the final review of its financial statements and other disclosures in the Quarterly Report.

The Company is working diligently to complete the Quarterly Report as quickly as possible.

PART IV—OTHER INFORMATION

(1)	Name and telephone number of person to contact in regard to this notification
	Gary Herman		925		455-9400
	(Name)		(Area Code)		(Telephone Number)
(2)	Have all other periodic reports required under Section 13 or 15(d) of the Securities Exchange Act of 1934 or Section 30 of the Investment Company Act of 1940 during the preceding 12 months or for such shorter period that the registrant was required to file such report(s) been filed? If answer is no, identify report(s). Yes  ☒    No  ☐
(3)	Is it anticipated that any significant change in results of operations from the corresponding period for the last fiscal year will be reflected by the earnings statements to be included in the subject report or portion thereof? Yes  ☐    No  ☒
	If so, attach an explanation of the anticipated change, both narratively and quantitatively, and, if appropriate, state the reasons why a reasonable estimate of the results cannot be made.

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Advent Technologies Holdings Inc.

(Name of Registrant as Specified in Charter)

has caused this notification to be signed on its behalf by the undersigned hereunto duly authorized.

Date:	November 14, 2025		By:	/s/ Gary Herman
				Gary Herman Chief Executive Officer

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