Tantech Holdings regains Nasdaq bid-price compliance

Nasdaq closed the compliance matter after TANH’s Class A closing bid price met the $1.00 threshold for 10 consecutive business days.

Accepted by SEC EDGAR 09/24/2026 - 08:00 AM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

TANTECH HOLDINGS LTD (TANH) regained compliance with Nasdaq’s minimum bid price requirement. Nasdaq notified the company on September 21, 2026, after its Class A common shares had a closing bid price of at least $1.00 per share for 10 consecutive business days, from September 4 through September 18, 2026. Nasdaq determined the requirement was met and closed the matter.

Key Figures

Minimum bid price: $1.00 per share Consecutive business days at threshold: 10 consecutive business days Compliance period: 180 calendar days +1 more

4 metrics

Minimum bid price $1.00 per share Nasdaq Listing Rule 5550(a)(2)

Consecutive business days at threshold 10 consecutive business days September 4 through September 18, 2026

Compliance period 180 calendar days Until September 22, 2026

Consecutive business days below threshold 30 consecutive business days Basis for Nasdaq’s March 26, 2026 noncompliance notice

Key Terms

minimum bid price requirement, closing bid price, compliance period, Listing Rule 5810(c)(3)(A)

4 terms

minimum bid price requirement regulatory

"minimum bid price requirement set forth in Nasdaq Listing Rule 5550(a)(2)"

A minimum bid price requirement is a rule that a stock must trade above a set price for a specified period to stay listed on an exchange. It matters to investors because falling below that threshold can trigger warnings or removal from the exchange, which can cut liquidity, reduce visibility, and often lead to sharper declines in share value—think of it like a venue’s minimum dress code that, if not met, can bar a performer from the stage.

closing bid price market

"the closing bid price ... had been at least $1.00 per share"

The closing bid price is the last price that a buyer was willing to pay for a security at the end of the trading day. It reflects the final visible demand for the stock — like the last offer someone makes for a used car before a yard closes — and helps investors gauge market interest, set valuations, and mark portfolios to market for that day.

compliance period regulatory

"provided a compliance period of 180 calendar days"

A compliance period is a defined stretch of time during which a company must meet specific legal, regulatory, or contractual rules and reporting requirements. Think of it like a scheduled inspection window or a homework deadline: failing to satisfy the rules within that window can trigger fines, restrictions, or extra oversight, so investors watch compliance periods as signals of near-term legal risk, potential costs, and impacts on a company’s operations or cash flow.

Listing Rule 5810(c)(3)(A) regulatory

"Pursuant to Nasdaq Listing Rule 5810(c)(3)(A)"

FAQ

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

What did TANH report about Nasdaq bid-price compliance?

Nasdaq determined TANH had regained compliance with Listing Rule 5550(a)(2) after its Class A common shares had a closing bid price of at least $1.00 per share for 10 consecutive business days, from September 4 through September 18, 2026. Nasdaq closed the matter.

What was TANH’s deadline to regain Nasdaq bid-price compliance?

TANH’s compliance period was 180 calendar days, or until September 22, 2026. Nasdaq provided the period under Listing Rule 5810(c)(3)(A) after notifying the company on March 26, 2026 that it did not meet the minimum bid-price requirement.

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

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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER

PURSUANT TO RULE 13a-16 OR 15d-16 OF THE

SECURITIES EXCHANGE ACT OF 1934

For the month of September 2026

Commission File Number: 001-36885

TANTECH HOLDINGS LTD

(Translation of registrant’s name into English)

No. 10 Cen Shan Road, Shuige Industrial Zone

Lishui City, Zhejiang Province

People’s Republic of China 323000

(Address of principal executive offices)

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F:

Form 20-F ☒     Form 40-F ☐

EXPLANATORY NOTE

On September 21, 2026, Tantech Holdings Ltd (the "Company") announced that it received a notification letter from the Listing Qualifications Department of The Nasdaq Stock Market LLC ("Nasdaq"), informing the Company that it has regained compliance with the minimum bid price requirement set forth in Nasdaq Listing Rule 5550(a)(2).

The Company had previously announced on March 31, 2026 that it received a notification letter from Nasdaq on March 26, 2026 informing the Company that it was not in compliance with the minimum bid price requirement set forth in Nasdaq Listing Rule 5550(a)(2), as the closing bid price of the Company's Class A common shares had been below $1.00 per share for 30 consecutive business days. Pursuant to Nasdaq Listing Rule 5810(c)(3)(A), the Company was provided a compliance period of 180 calendar days, or until September 22, 2026, to regain compliance with the minimum bid price requirement.

On September 21, 2026, Nasdaq notified the Company that, for the last 10 consecutive business days, from September 4, 2026 through September 18, 2026, the closing bid price of the Company's Class A common shares had been at least $1.00 per share. Accordingly, Nasdaq determined that the Company has regained compliance with Listing Rule 5550(a)(2), and the matter is now closed.

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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

	Tantech Holdings Ltd.
Date: September 24, 2026	By:	/s/ Yongxin Su
		Yongxin Su
		Co-Chief Executive Officer

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