STOCK TITAN

Advent Techs Holdings (ADNH) Stock Price, News & Analysis

ADNH OTC
Published by Stock Titan Data refreshed

Price Move History

Daily moves over 5%
112 213 sessions, November 4, 2025 to November 4, 2026
Largest daily move
+1566.7% close of October 5, 2026
1-month change
+0% closing prices, September 28, 2026 to November 4, 2026

Company Description

Advent Technologies Holdings, Inc. (symbol: ADNH) is a U.S. corporation in the fuel cell and hydrogen technology sector. According to company disclosures, Advent develops, manufactures, and assembles complete fuel cell systems and supplies customers with critical components for fuel cells in the renewable energy sector. The company is headquartered in Livermore, California, and reports that it holds intellectual property related to next-generation high-temperature proton exchange membrane (HT-PEM) fuel cell technology.

Advent states that it has approximately 70 patents issued, pending, and/or licensed for fuel cell technology. Its HT-PEM technology is described as enabling various fuels to function at high temperatures and under extreme conditions. Based on the company’s description, this technology is suitable for use in sectors such as automotive, aviation, defense, oil and gas, marine, and power generation.

Business focus and technology

Advent’s business centers on fuel cell systems and key fuel cell components. The company highlights its work on HT-PEM membrane electrode assemblies (MEAs), which are integral parts of fuel cells. It reports that its next-generation HT-PEM technology is designed to operate at high temperatures and under demanding conditions, which can be important for applications where durability and efficiency are critical.

In public communications, Advent has emphasized the role of its HT-PEM membrane electrode assembly in hydrogen-based propulsion concepts. For example, the company has discussed how its technology can enable engines to be cooled with smaller radiators, which can reduce weight and drag in aviation applications. This illustrates how Advent positions its technology within advanced hydrogen and fuel cell use cases.

Collaboration and application areas

Advent has disclosed a Joint Development Agreement with Airbus focused on the next generation Ion Pair™ membrane electrode assembly for HT-PEM fuel cell technology. The company reports that this agreement relates to Airbus’s work on a hydrogen electric propulsion system. Advent has stated that it has met interim power targets under this collaboration and that ongoing work includes durability measurements under flight cycles and stack testing of the Ion Pair MEA technology.

According to Advent, its HT-PEM technology is intended to be suitable for multiple sectors, including automotive, aviation, defense, oil and gas, marine, and power generation. These references indicate that the company views its technology as applicable across a range of transportation and energy-related environments that may require operation under high temperature or other challenging conditions.

Geographic footprint

Advent describes itself as a U.S. corporation headquartered in Livermore, California. The company also reports having offices in Athens, Patras, and Kozani in Greece. This indicates that its activities span both the United States and Europe, particularly in Greece, in connection with its fuel cell and hydrogen technology operations.

Capital structure and securities

In regulatory filings, Advent Technologies Holdings, Inc. identifies its common stock with a par value of $0.0001 per share. The company has also disclosed warrants to purchase one share of common stock each at a specified exercise price, which trade under the symbol ADNWW on The Nasdaq Stock Market LLC. These disclosures provide insight into the company’s equity and warrant structure as reported in its SEC filings.

Financing activities

Advent has reported entering into a Secured Promissory Note with a lender, with an aggregate principal amount denominated in Swiss francs and interest accruing at a stated annual rate. Under this note, the company is required to repay the borrowed amount in a single payment on a specified maturity date. The note is secured by a continuing first-priority security interest in certain collateral of the company and includes customary events of default, as described in the filing.

The company has disclosed that the lender has the option to convert any or all amounts due under the promissory note into common stock of Advent at a purchase price per share based on the average of the three lowest trade prices of the common stock during a defined period prior to conversion. The filing also states that the outstanding principal and interest automatically convert into common stock upon the occurrence of a defined “Qualified Financing,” and that the company intends to use the proceeds for payment of certain corporate expenses and general working capital purposes.

Corporate governance disclosure

In connection with the Secured Promissory Note, Advent has reported the appointment of the lender to its Board of Directors as a Class II Director, to serve until a specified future annual meeting of shareholders or until earlier resignation or retirement. The company’s filing includes background information on this director’s prior roles in the energy and infrastructure industry, but those details relate to the individual’s biography rather than Advent’s own operations.

Regulatory reporting

Advent Technologies Holdings, Inc. files reports with the U.S. Securities and Exchange Commission, including current reports on Form 8-K that describe material events such as financing arrangements and board appointments. These filings provide additional detail on the company’s capital structure, governance, and significant agreements beyond the high-level business description.

Summary of sector relevance

Based on the company’s own description, Advent operates in the fuel cell and hydrogen technology space, focusing on HT-PEM fuel cell systems and components. Its stated patent portfolio and collaborative work on hydrogen electric propulsion systems indicate that it targets applications where high-temperature operation and durability are important, across transportation, defense, energy, and power generation sectors.

Stock Performance

$0.0003
-
-
Last updated: November 4, 2026 at 16:00
-99.9%
Performance this year

Advent Techs Holdings (ADNH) closed at $0.0003 on November 4, 2026. So far this year, the price has lost 99.9%.

See what a $1,000 investment in ADNH would be worth today

Average down calculator for ADNH

ADNH Metrics & Rankings

Price returns through November 4, 2026. Month and year figures include the first trading day. Ranking links may use different dates.

Latest News

Advent Techs Holdings has 3 recent news articles. Of the recent coverage, 1 article coincided with positive price movement and 2 with negative movement. Key topics include management. View all ADNH news →

SEC Filings

Advent Techs Holdings has filed 6 recent SEC filings, including 3 Form 8-K, 2 Form 25-NSE, 1 Form NT 10-K. The most recent filing was submitted on . SEC filings provide transparency into a company's financial condition, material events, and regulatory compliance. View all ADNH SEC filings →

Financial Highlights

Advent Techs Holdings generated $3.3M in revenue in FY2024, retaining a 54.6% gross margin, and operating income reached -$18.4M. Diluted earnings per share stood at -$15.65. The company generated $1.4M in operating cash flow. The current ratio was 0.09, measuring current assets divided by current liabilities.

$3.3M
Revenue (FY2024)
$1.4M
Operating Cash Flow
$1.8M
Gross Profit (FY2024)

Upcoming Events

No upcoming events scheduled for ADNH.

Short Interest History

Last 12 Months

Short interest in Advent Techs Holdings (ADNH) currently stands at 18.1 thousand shares, up 0.1% from the previous reporting period, representing 0.5% of the float. Since November 2025, short interest has decreased by 79.7%.

Days to Cover History

Last 12 Months

Days to cover for Advent Techs Holdings (ADNH) currently stands at 2.2 days, down 47.1% from the previous period. The ratio is the reported short interest divided by the average daily trading volume. Since November 2025, the figure has increased by 119%. Across the settlements charted above, it has ranged from 1.0 to 15.8 days.

ADNH Company Profile & Sector Positioning

Advent Techs Holdings (ADNH) operates in the Electrical Equipment & Parts industry within the broader Industrials sector and is listed on the OTC.

Investors comparing ADNH often look at related companies in the same sector, including TurnOnGreen Inc (TOGI), Exro Technologies Inc (EXROF), Gelion plc (GELNF), Aegis Crtcal Enrgy DEF Co (QESSF), and Qualstar Corp (QBAK). Comparing financial metrics, valuation ratios, and stock performance across these peers can help investors evaluate ADNH's relative position within its industry.

Frequently Asked Questions

The current stock price of Advent Techs Holdings (ADNH) is $0.0003 as of November 4, 2026.

The market cap of Advent Techs Holdings (ADNH) is approximately $1.1K. Learn more about what market capitalization means .

The FY2024 revenue of Advent Techs Holdings (ADNH) is $3.3M, from its most recent completed fiscal year.

The diluted earnings per share (EPS) of Advent Techs Holdings (ADNH) is -$15.65 for FY2024, its most recent completed fiscal year. Learn more about EPS .

The operating cash flow of Advent Techs Holdings (ADNH) is $1.4M for FY2024, its most recent completed fiscal year. Learn about cash flow.

The gross profit margin of Advent Techs Holdings (ADNH) is 54.6% for FY2024, its most recent completed fiscal year. Learn about gross margins.

The current ratio of Advent Techs Holdings (ADNH), current assets divided by current liabilities, was 0.09 at the end of FY2024, its most recent completed fiscal year. Learn about liquidity ratios.

The gross profit of Advent Techs Holdings (ADNH) is $1.8M for FY2024, its most recent completed fiscal year.

The operating income of Advent Techs Holdings (ADNH) is -$18.4M for FY2024, its most recent completed fiscal year. Learn about operating income.

Advent Technologies Holdings, Inc. develops, manufactures, and assembles complete fuel cell systems and supplies critical components for fuel cells in the renewable energy sector. The company focuses on high-temperature proton exchange membrane (HT-PEM) fuel cell technology.

Advent Technologies Holdings, Inc. states that it is headquartered in Livermore, California, and also reports offices in Athens, Patras, and Kozani in Greece.

Advent specializes in next-generation high-temperature proton exchange membrane (HT-PEM) fuel cell technology and related membrane electrode assemblies (MEAs). The company reports that this technology enables various fuels to function at high temperatures and under extreme conditions.

According to Advent, its HT-PEM technology is suitable for the automotive, aviation, defense, oil and gas, marine, and power generation sectors, where high-temperature operation and demanding conditions are common.

Advent has disclosed a Joint Development Agreement with Airbus to advance the next generation Ion Pair™ membrane electrode assembly for HT-PEM fuel cell technology. This work is connected to Airbus’s hydrogen electric propulsion system, with Advent focusing on power performance, durability under flight cycles, and stack testing.

Advent states that it has approximately 70 patents issued, pending, and/or licensed for fuel cell technology, covering aspects of its next-generation HT-PEM fuel cell solutions.

Advent reported entering into a Secured Promissory Note with a lender in an aggregate principal amount denominated in Swiss francs, bearing interest at an annual rate of 8.5%. The note is secured by a first-priority security interest in certain company collateral, matures on a specified date, and includes customary events of default.

Yes. Advent’s filing states that the lender may convert any or all amounts due under the Secured Promissory Note into common stock at a price per share based on the average of the three lowest trade prices of the common stock during a defined period. The note also provides for automatic conversion upon a defined Qualified Financing.

According to its Form 8-K, Advent intends to use the proceeds from the Secured Promissory Note for payment of certain corporate expenses and general working capital purposes.