Advent Technologies files 12b-25 for late 2025 10-K

Rhea-AI Filing Summary

Advent Technologies Holdings, Inc. filed a Form 12b-25 notifying the SEC that it cannot timely file its Annual Report on Form 10-K for the period ended December 31, 2025 because it requires additional time to complete the final review of financial statements and disclosures. The Company "anticipates that the Form 10-K will be filed within fifteen calendar days following the prescribed due date" in reliance on Rule 12b-25(b). The notice also references prior late 10-Q filings for periods ended September 30, 2025 and March 31, 2025 and is signed by CEO Gary Herman on March 31, 2026.

Insights

SEC Reporting Specialist

Routine late-filing notice under Rule 12b-25 with a short extension request.

The filing states the company cannot complete its 2025 Form 10-K without "unreasonable effort or expense" and explicitly relies on Rule 12b-25(b) to extend the filing window by up to fifteen calendar days. This is an administrative remedy frequently used when final audit or disclosure work is incomplete.

Key dependencies include completion of the final financial statement review and any auditor exhibits. Subsequent SEC filings will confirm whether the 10-K is filed within the stated extension and if the company discloses any restatements or material changes.

Corporate Governance Analyst

Repeated late filings merit monitoring of disclosure controls and timing.

The notice documents prior late 10-Q filings for periods ended September 30, 2025 and March 31, 2025, indicating recurring timing issues. Recurrent 12b-25 notifications can signal process gaps in financial close, audit coordination, or internal controls over reporting.

Watch for the eventual Form 10-K to review auditor opinions, disclosures about internal control weaknesses, and any quantified changes to results once the filing is submitted.

Key Figures

Extension period requested: 15 calendar days Reporting period: December 31, 2025 Notice date: March 31, 2026 +3 more

6 metrics

Extension period requested 15 calendar days Rule 12b-25(b) extension following prescribed due date

Reporting period December 31, 2025 Form 10-K period end

Notice date March 31, 2026 Date Form 12b-25 signed by CEO Gary Herman

Prior late 10-Q filed November 17, 2025 10-Q for period ended September 30, 2025 filed after due date

Prior late 10-Q filed June 30, 2025 10-Q for period ended March 31, 2025 filed after due date

Company contact phone 925-455-9400 Contact on Form 12b-25 (Gary Herman)

Key Terms

Rule 12b-25(b), Form 10-K, prescribed due date, Notification of Late Filing

4 terms

Rule 12b-25(b) regulatory

""anticipates that the Form 10-K will be filed within fifteen calendar days following the prescribed due date""

Form 10-K regulatory

""unable...to file its Annual Report on Form 10-K for the period ended December 31, 2025""

A Form 10-K is a comprehensive report that publicly traded companies are required to file annually with regulators. It provides a detailed overview of a company's financial health, operations, and risks, similar to a detailed health report. Investors use this information to assess the company's performance and make informed decisions about buying or selling its stock.

prescribed due date regulatory

""within fifteen calendar days following the prescribed due date""

Notification of Late Filing regulatory

"Title: "FORM 12b-25 NOTIFICATION OF LATE FILING""

A notification of late filing is a formal public statement that a company failed to submit a required regulatory report (for example, quarterly or annual financial statements) by the deadline. It matters to investors because missed filings can signal accounting, operational, or governance problems, may lead to fines or trading restrictions, and increases uncertainty about the company's transparency—like a public “we missed the deadline” flag that raises risk for shareholders.

FAQ

Why did Advent Technologies (ADNH) file a Form 12b-25?

It filed to notify the SEC it cannot timely file its 2025 Form 10-K while completing final financial reviews. The company says it needs extra time to finish the final review of financial statements and disclosures before filing.

How long does Advent expect to delay the Form 10-K filing?

Advent anticipates filing within fifteen calendar days following the prescribed due date. The company explicitly cites reliance on Rule 12b-25(b) and expects to meet the extended deadline.

Has Advent previously filed late periodic reports in the last 12 months?

Yes. The notice cites late 10-Q filings: the quarter ended September 30, 2025 was filed on November 17, 2025, and the quarter ended March 31, 2025 was filed on June 30, 2025.

Who signed the 12b-25 notice for Advent Technologies?

The Form 12b-25 was signed by Gary Herman, Chief Executive Officer, and dated March 31, 2026. Contact information on the form lists a telephone number for company inquiries.

Does filing a Form 12b-25 mean Advent’s financials will change materially?

The company did not state anticipated significant changes in results. The form asks whether significant changes are expected; no affirmative quantitative change was provided in this notice.

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

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Accepted by SEC EDGAR 03/31/2026 - 08:45 AM 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: December 31, 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,” “we,” “us” or “our”) has determined that it is unable, without unreasonable effort or expense, to file its Annual Report on Form 10-K for the period ended December 31, 2025 (the “Form 10-K”) on or before the prescribed due date. The Company requires additional time to complete the final review of its financial statements and other disclosures in the Annual Report. The Company is, and has been, working diligently to complete its Form 10-K as soon as possible and anticipates that the Form 10-K will be filed within fifteen calendar days following the prescribed due date in compliance with Rule 12b-25(b).

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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  ☒
	The Company filed its Quarterly Report on Form 10-Q for the period ended September 30, 2025 on November 17, 2025 after the required filing date of November 14, 2025, as disclosed in that certain Notification of Late Filing on Form 12b-25 filed with the Securities and Exchange Commission on November 14, 2025.
	The Company filed its Quarterly Report on Form 10-Q for the period ended March 31, 2025 on June 30, 2025 after the required filing date of May 15, 2025, as disclosed in that certain Notification of Late Filing on Form 12b-25 filed with the Securities and Exchange Commission on May 14, 2025.
(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:	March 31, 2026		By:	/s/ Gary Herman
				Gary Herman
				Chief Executive Officer

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