ADVENT TECHNOLOGIES HOLDINGS, INC.

Overview

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• TickerADNH¹
• IndustryMiscellaneous Electrical Machinery, Equipment & Supplies¹
• HeadquartersBoston, Massachusetts¹
• Incorporated inDE²
• Business address500 Rutherford Avenue, Suite 102, Boston, Ma 02129²
• Filer categoryNon-accelerated filer, Smaller reporting company²

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We are an advanced materials and technology development company operating in the fuel cell and hydrogen technology space, including liquid hydrogen carriers such as methanol. We are a world-leading company in the development of HT-PEM (High Temperature Proton Exchange Membrane) technology (with approximately 150 patents issued, pending, or licensed worldwide). The HT-PEM fuel cell technology enables off-grid power systems to produce clean power from various green fuels (hydrogen, methanol, bio and e-Methanol, and renewable natural gas) and to function with higher efficiency at extreme ambient temperatures and in general extreme environmental conditions (humidity, air pollution). Advent’s main operations focus on developing and manufacturing the Membrane Electrode Assembly (MEA) and the fuel cell stack, which is the core electrochemical element and the most critical component of the fuel …⁴ From its latest annual report

Corporate structure

ADVENT TECHNOLOGIES HOLDINGS, INC. sits at the top of its group. 2 entities, 2 countries on record. Switch between the flow chart and the network, and select any entity to see its details.

Built from subsidiaries listed in Exhibit 21 of annual reports filed with the SEC; major holders from Schedules 13D and 13G. Each entity in the chart links to its source.

What it owns

What ADVENT TECHNOLOGIES HOLDINGS, INC. reports owning in its annual reports to the SEC: buildings, land and equipment, real estate and locations, investments, intangible assets and inventory, at the end of its latest fiscal year and a year before.

Property and equipment

Investments

Intangibles and goodwill

Inventory

Properties, in its own words

Our principal office is located at 5637 La Ribera St., Suite A, Livermore, CA 94550. We also lease approximately 3,400 square feet of laboratory space in Patras, Greece, approximately 1,000 square feet of office space in Athens, Greece, and approximately 800 square feet of office space in Kozani, Greece.

We believe that all our properties have been adequately maintained, are generally in good condition, and are suitable and adequate for our business.

Item 2 of the 10-K filed Jun 6, 2025.⁴

Leadership

Who has led ADVENT TECHNOLOGIES HOLDINGS, INC., and when. Pick a name to see everywhere that person has worked.

• Chief executive officerGary L. Herman Mar 11, 2025 to Mar 11, 2025¹⁴
• Chief executive officerVassilios Gregoriou Feb 5, 2021 to Sep 8, 2023¹⁵
• Chief executive officerJohn Hunter William Nov 15, 2018 to Nov 15, 2018¹⁶
• ChairVassilios Gregoriou Feb 5, 2021 to Sep 8, 2023¹⁵
• PresidentJohn Hunter William Feb 5, 2021 to Jun 15, 2021¹⁷
• Chief financial officerNaiem Hussain Feb 12, 2024 to Feb 20, 2024¹⁸
• Chief financial officerKevin L. Brackman Jul 20, 2021 to Sep 8, 2023¹⁹
• Chief financial officerJohn Hunter William Nov 15, 2018 to Jun 15, 2021¹⁶
• Chief operating officerJames F. Coffey Feb 5, 2021 to Apr 14, 2023²⁰

Subsidiaries and ownership

Subsidiaries (Exhibit 21)

• Advent Technologies GmbH Germany³
• Advent Technologies Inc. Delaware³
• Advent Technologies LLC Delaware³
• Advent Technologies SA Greece³

The subsidiaries the company lists in Exhibit 21 of its annual report, as filed.

Former names

• AMCI Acquisition Corp.Jul 20, 2018 to Feb 4, 2021²

Timeline

1. Jul 22, 20268-K Other events³⁷
2. May 15, 20268-K Other events³⁸
3. Jan 15, 20268-K Entered a material agreement; Unregistered sale of shares; Executive or director change³⁹
4. Nov 10, 20258-K Ended a material agreement⁴⁰
5. Nov 3, 20258-K Executive or director change⁴¹
6. Oct 29, 20258-K Listing notice or transfer⁴²
7. Oct 22, 20258-K Shareholder vote⁴³
8. Sep 12, 20258-K Ended a material agreement⁴⁴
9. Sep 4, 20258-K Entered a material agreement; Unregistered sale of shares⁴⁵
10. Aug 22, 20258-K Listing notice or transfer⁴⁶
11. Aug 18, 20258-K Entered a material agreement; Unregistered sale of shares⁴⁷
12. Aug 12, 20258-K Other events⁴⁸
13. Mar 11, 2025New chief executive Gary L. Herman becomes CEO¹⁴
14. Feb 5, 2021New chief executive Vassilios Gregoriou becomes CEO¹⁵
15. Nov 15, 2018New chief executive John Hunter William becomes CEO¹⁶

Calendar

When it reported results

1. Aug 20, 2024Reported quarterly or annual results⁴⁹
2. Nov 14, 2023Reported quarterly or annual results⁵⁰
3. Aug 11, 2023Reported quarterly or annual results⁵¹
4. May 15, 2023Reported quarterly or annual results⁵²
5. Mar 31, 2023Reported quarterly or annual results⁵³
6. Nov 14, 2022Reported quarterly or annual results⁵⁴
7. Aug 9, 2022Reported quarterly or annual results⁵⁵
8. May 12, 2022Reported quarterly or annual results⁵⁶

Upcoming dates from Nasdaq's calendar; past results from the company's 8-K filings (Item 2.02). The full markets calendar

Filings

193 filings to the SEC since October 2021: 4 annual reports, 13 quarterly reports, 75 major events, 33 insider forms, 11 large holders, 57 other. The latest 20:

1. Jul 22, 20268-K EDGAR
2. May 15, 20268-K EDGAR
3. Mar 31, 2026NT 10-K EDGAR
4. Jan 21, 202625-NSE EDGAR
5. Jan 21, 202625-NSE EDGAR
6. Jan 15, 20268-K EDGAR
7. Nov 17, 202510-Q EDGAR
8. Nov 14, 2025NT 10-Q EDGAR
9. Nov 10, 20258-K EDGAR
10. Nov 3, 20258-K EDGAR
11. Oct 29, 20258-K EDGAR
12. Oct 22, 20258-K EDGAR
13. Sep 30, 2025DEF 14A EDGAR
14. Sep 12, 20258-K EDGAR
15. Sep 4, 20258-K EDGAR
16. Aug 27, 2025EFFECT EDGAR
17. Aug 27, 2025424B3 EDGAR
18. Aug 25, 2025CORRESP EDGAR
19. Aug 25, 2025UPLOAD EDGAR
20. Aug 22, 20258-K EDGAR

Every filing from the last five years, summarized. The full record is on SEC EDGAR.

Insider trades

14 open-market trades by officers, directors and large owners since October 2021: 0 buys and 14 sales. Grants, option exercises and gifts are left out.

From Forms 4 filed with the SEC.

Major holders

Investors who own more than 5% of the shares must tell the SEC: a 13D if they may seek to influence the company, a 13G if they hold passively.

• LMR Partners LLPSC 13G/A, 2 filings Feb 9, 2023 to Feb 12, 2024⁵⁷
• BNP Paribas Asset Management UK LtdSC 13G/A, 5 filings Jan 31, 2022 to Jan 10, 2024⁵⁸
• F.E.R. fischer Edelstahlrohre GmbHSC 13G/A, 1 filing Apr 4, 2023⁵⁹
• InvescoSC 13G/A, 2 filings Feb 14, 2022 to Feb 8, 2023⁶⁰
• FMR LLCSC 13G/A, 1 filing Feb 9, 2022⁶¹

Executive pay

What the company paid its top executives, from the summary compensation table in its proxy statement. Total pay includes salary, bonus, stock and option awards and other pay, as the company valued them.

SEC filer profile

How ADVENT TECHNOLOGIES HOLDINGS, INC. is registered with the Securities and Exchange Commission, from its EDGAR record and the cover page of its latest annual report.

• Name on EDGARADVENT TECHNOLOGIES HOLDINGS, INC.¹
• CIK0001744494
• Employer ID (EIN)83-0982969⁴
• Filer statusNon-accelerated filer not an emerging growth company; a smaller reporting company; not a shell company⁴
• Incorporated inDelaware⁴
• Fiscal year endsDecember 31¹
• Industry code (SIC)3690 Miscellaneous Electrical Machinery, Equipment & Supplies¹
• SEC reviewing officeOffice of Manufacturing, Division of Corporation Finance¹
• Business address500 Rutherford Avenue, Suite 102, Boston, MA 02129¹
• Phone857-264-7035¹
• Shares outstanding3,788,634 as of Nov 14, 2025¹²
• Public float$6.7M as of Jun 30, 2024⁴
• AuditorM&K CPAS, PLLC, The Woodlands, TX PCAOB ID 2738; no auditor attestation of internal control over financial reporting⁴
• On EDGAR sinceJul 20, 2018¹
• Filings388 in all: 8-K (107), 4 (46), 424B3 (32), 3 (30), 10-Q (21), SC 13G/A (21), SC 13G (14), 8-K/A (9)¹
  All 37 form types

  CORRESP (9), DEF 14A (9), DEFA14A (9), EFFECT (8), 10-K (7), NT 10-Q (7), UPLOAD (7), 4/A (6), 425 (6), 424B5 (4), NT 10-K (4), PRE 14A (4), S-1 (4), 25-NSE (3), POS AM (2), S-1/A (2), S-4 (2), S-4/A (2), S-8 (2), SC 13D (2), 10-K/A (1), 424B4 (1), 8-A12B (1), CERT (1), DRS (1), DRS/A (1), DRSLTR (1), RW (1), S-3 (1)

• Latest filingsAnnual report (10-K) Jun 6, 2025
  Quarterly report (10-Q) Nov 17, 2025
  Proxy statement (DEF 14A) Sep 30, 2025
  Latest 8-K (8-K) Jul 22, 2026

Securities registered for trading

From the cover page of the 10-K filed Jun 6, 2025 (Section 12(b) of the Exchange Act).⁴

Risk factors and legal proceedings

The risks ADVENT TECHNOLOGIES HOLDINGS, INC. names in Item 1A of its 10-K filed Jun 6, 2025: 46 risks under these headings, as written.⁴

• We have identified material weaknesses in our system of internal controls pursuant to Section 404 of the Sarbanes-Oxley Act of 2002. If not remediated, these material weaknesses could result in material misstatements in our consolidated financial statements. We may be unable to develop, implement and maintain appropriate controls in future periods.
• If we fail to maintain an effective system of internal controls, we may not be able to accurately report our financial results or detect fraud. Consequently, shareholders could lose confidence in our financial reporting, and this may decrease the trading price of our common stock.
• Our audited financial statements included a statement that there is a substantial doubt about our ability to continue as a going concern and a continuation of negative financial trends could result in our inability to continue as a going concern.
• We have incurred losses since inception and we expect that we will continue to incur losses for the foreseeable future.
• We may be unable to adequately control the costs associated with our operations.
• We may need to raise additional funds and these funds may not be available to us when we need them. If we cannot raise additional funds when we need them, our operations and prospects could be negatively affected.
• We continue to generate a low level of revenue from our core products.
• If we fail to manage our future growth effectively, we may not be able to market and sell our fuel cells successfully.
• We will rely on complex machinery for our operations and production involves a significant degree of risk and uncertainty in terms of operational performance and costs.
• Our future growth is dependent upon the market’s willingness to adopt our hydrogen-powered fuel cell and membrane technology.
• Future product recalls could materially adversely affect our business, prospects, operating results and financial condition.
• If we are unable to attract and retain key employees and hire qualified management, technical and fuel cell and system engineering personnel, our ability to compete could be harmed.

Legal proceedings

From time to time, we may become involved in various lawsuits and legal proceedings which arise in the ordinary course of business. However, litigation is subject to inherent uncertainties, and an adverse result in these or other matters may arise from time to time that may harm our business.

On May 9, 2025, Chris Kaskavelis (“Kaskavelis”), a former employee of Advent SA, filed a claim against the Company’s wholly owned subsidiary in Greece, Advent SA, before the Athens First Instance Court (LABOR CLAIMS). A hearing is on the claim is scheduled for October 20, 2025. In connection with the claim, Kaskavelis alleges that Advent should pay him the following amounts: (1) €107,194.90 for unpaid wages, (2) €612,206.40 for unpaid severance, (3) €50,000 for “moral damages” and (4) related court expenses stemming from the lawsuit. The Company denies the Kaskavelis claims as they are unsubstantiated and without merit as he was terminated by the Company for cause per the terms of his employment agreement. Notwithstanding the same, and as a contingency, the Company has accrued for the unpaid wages portion of his claim in the amount of €107,194.90 ($124,000). The Company believes that the remainder of the Kaskavelis claims are wholly without merit and intends to defend itself vigorously in these proceedings, although we cannot accurately predict the ultimate outcome of this matter.

The opening of Item 3, Legal Proceedings.⁴