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Advent Technologies Holdng Stock Price, News & Analysis

ADNH OTC Link

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

$0.3611
-16.02%
0.07
Last updated: April 2, 2026 at 09:40
-52.22%
Performance 1 year

Advent Technologies Holdng (ADNH) stock last traded at $0.4300, down 16.02% from the previous close. Over the past 12 months, the stock has lost 52.2%. At a market capitalization of $1.4M, ADNH is classified as a micro-cap stock with approximately 3.8M shares outstanding.

Latest News

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

SEC Filings

Advent Technologies Holdng has filed 4 recent SEC filings, including 2 Form 25-NSE, 1 Form NT 10-K, 1 Form 8-K. The most recent filing was submitted on March 31, 2026. SEC filings provide transparency into a company's financial condition, material events, and regulatory compliance. View all ADNH SEC filings →

Financial Highlights

Advent Technologies Holdng generated $3.3M in revenue over the trailing twelve months, retaining a 54.6% gross margin, operating income reached -$18.4M (-560.7% operating margin), and net income was -$41.0M, reflecting a -1251.3% net profit margin. Diluted earnings per share stood at $-15.65. The company generated $1.4M in operating cash flow. With a current ratio of 0.09, short-term liquidity bears monitoring.

$3.3M
Revenue (TTM)
-$41.0M
Net Income (TTM)
$1.4M
Operating Cash Flow

Upcoming Events

Short Interest History

Last 12 Months

Short interest in Advent Technologies Holdng (ADNH) currently stands at 15.3 thousand shares, down 13.3% from the previous reporting period, representing 0.4% of the float. Over the past 12 months, short interest has decreased by 94.5%. This relatively low short interest suggests limited bearish sentiment.

Days to Cover History

Last 12 Months

Days to cover for Advent Technologies Holdng (ADNH) currently stands at 2.8 days, up 100% from the previous period. This days-to-cover ratio represents a balanced liquidity scenario for short positions. The days to cover has increased 180% over the past year, indicating either rising short interest or declining trading volume. The ratio has shown significant volatility over the period, ranging from 1.0 to 2.8 days.

ADNH Company Profile & Sector Positioning

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

Frequently Asked Questions

What is the current stock price of Advent Technologies Holdng (ADNH)?

The current stock price of Advent Technologies Holdng (ADNH) is $0.43 as of April 1, 2026.

What is the market cap of Advent Technologies Holdng (ADNH)?

The market cap of Advent Technologies Holdng (ADNH) is approximately 1.4M. Learn more about what market capitalization means .

What is the revenue (TTM) of Advent Technologies Holdng (ADNH) stock?

The trailing twelve months (TTM) revenue of Advent Technologies Holdng (ADNH) is $3.3M.

What is the net income of Advent Technologies Holdng (ADNH)?

The trailing twelve months (TTM) net income of Advent Technologies Holdng (ADNH) is -$41.0M.

What is the earnings per share (EPS) of Advent Technologies Holdng (ADNH)?

The diluted earnings per share (EPS) of Advent Technologies Holdng (ADNH) is $-15.65 on a trailing twelve months (TTM) basis. Learn more about EPS .

What is the operating cash flow of Advent Technologies Holdng (ADNH)?

The operating cash flow of Advent Technologies Holdng (ADNH) is $1.4M. Learn about cash flow.

What is the profit margin of Advent Technologies Holdng (ADNH)?

The net profit margin of Advent Technologies Holdng (ADNH) is -1251.3%. Learn about profit margins.

What is the operating margin of Advent Technologies Holdng (ADNH)?

The operating profit margin of Advent Technologies Holdng (ADNH) is -560.7%. Learn about operating margins.

What is the gross margin of Advent Technologies Holdng (ADNH)?

The gross profit margin of Advent Technologies Holdng (ADNH) is 54.6%. Learn about gross margins.

What is the current ratio of Advent Technologies Holdng (ADNH)?

The current ratio of Advent Technologies Holdng (ADNH) is 0.09, indicating the company's ability to pay short-term obligations. Learn about liquidity ratios.

What is the gross profit of Advent Technologies Holdng (ADNH)?

The gross profit of Advent Technologies Holdng (ADNH) is $1.8M on a trailing twelve months (TTM) basis.

What is the operating income of Advent Technologies Holdng (ADNH)?

The operating income of Advent Technologies Holdng (ADNH) is -$18.4M. Learn about operating income.

What does Advent Technologies Holdings, Inc. (ADNH) do?

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.

Where is Advent Technologies headquartered?

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

What technology does Advent Technologies specialize in?

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.

In which sectors can Advent’s HT-PEM fuel cell technology be used?

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.

What is Advent’s collaboration with Airbus about?

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.

How many patents does Advent Technologies report having?

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.

What is the Secured Promissory Note reported by Advent?

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.

Can the Secured Promissory Note be converted into Advent common stock?

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.

How does Advent plan to use the proceeds from the Secured Promissory Note?

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.