Grayscale Ethereum Mini Trust ETF (ETH) updates CoinDesk Ether index venues

Rhea-AI Filing Summary

Grayscale Ethereum Mini Trust ETF reported an operational change to the index used for its pricing. CoinDesk Indices, Inc., the index provider, added Bitstamp by Robinhood as a new digital asset trading platform, or “Constituent Trading Platform,” for the CoinDesk Ether Price Index (ETX) effective December 21, 2025. No existing platforms were removed as part of this scheduled quarterly review.

As of this update, the Index now draws pricing data from six platforms: Coinbase, Kraken, Crypto.com, LMAX Digital, Gemini, and Bitstamp. The index provider may change the trading venues or the way the index price is calculated at any time, including during future scheduled quarterly reviews that apply its stated criteria.

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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): December 21, 2025

Grayscale Ethereum Mini Trust ETF

(Exact name of Registrant as Specified in Its Charter)

Delaware			001-42184	99-6447880
(State or Other Jurisdiction of Incorporation)			(Commission File Number)	(IRS Employer Identification No.)
c/o Grayscale Investments Sponsors, LLC 290 Harbor Drive, 4th Floor
Stamford, Connecticut				06902
(Address of Principal Executive Offices)				(Zip Code)

Registrant’s Telephone Number, Including Area Code: 212 668-1427

N/A

(Former Name or Former Address, if Changed Since Last Report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

	☐	Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)
	☐	Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)
	☐	Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))
	☐	Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each class		Trading Symbol(s)		Name of each exchange on which registered
Grayscale Ethereum Mini Trust ETF Shares		ETH		NYSE Arca, Inc.

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§ 230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§ 240.12b-2 of this chapter).

Emerging growth company ☒

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 8.01. Other Events.

CoinDesk Indices, Inc. (the “Index Provider”) announced a change to the Digital Asset Trading Platforms used to derive the Index Price (collectively, “Constituent Trading Platforms”) for Grayscale Ethereum Mini Trust ETF (the “Trust”). Effective December 21, 2025, the Index Provider added Bitstamp by Robinhood (“Bitstamp”) to the CoinDesk Ether Price Index (ETX) (the “Index”) due to the trading platform meeting the Index Provider’s minimum liquidity requirement, and did not remove any Constituent Trading Platforms as part of its scheduled quarterly review. As of the date of this current report, the Constituent Trading Platforms included in the Index are Coinbase, Kraken, Crypto.com, LMAX Digital, Gemini, and Bitstamp.

The Index Provider may change the trading venues that are used to calculate the Index Price, or otherwise change the way in which an Index Price is calculated, at any time. The Index Provider has scheduled quarterly reviews, in which it may add or remove Constituent Trading Platforms that satisfy or fail the criteria described in “Item 1. Business—Overview of the Ethereum Industry and Market—Ether Value—The Index and the Index Price” in the Trust’s Annual Report on Form 10-K for the period ended December 31, 2024, as filed with the Securities and Exchange Commission on February 27, 2025.

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.

			Grayscale Investments Sponsors, LLC, as Sponsor of Grayscale Ethereum Mini Trust ETF
Date:	December 23, 2025	By:	/s/ Edward McGee
			Name: Edward McGee Title: Chief Financial Officer (Principal Financial and Accounting Officer)*

* The Registrant is a trust and the identified person signing this report is signing in their capacity as an authorized officer of Grayscale Investments Sponsors, LLC, the Sponsor of the Registrant.

FAQ

What change did Grayscale Ethereum Mini Trust ETF (ETH) disclose in this 8-K?

The ETF disclosed that CoinDesk Indices, Inc., its index provider, added Bitstamp by Robinhood as a new Constituent Trading Platform for the CoinDesk Ether Price Index (ETX) used by the trust.

When did Bitstamp become part of the CoinDesk Ether Price Index for ETH?

Bitstamp was added to the CoinDesk Ether Price Index (ETX) effective December 21, 2025, following the index provider’s scheduled quarterly review.

Which trading platforms now feed into the CoinDesk Ether Price Index for Grayscale Ethereum Mini Trust ETF?

As of the date of the report, the index uses six Constituent Trading Platforms: Coinbase, Kraken, Crypto.com, LMAX Digital, Gemini, and Bitstamp.

Were any trading platforms removed from the index in this update for ETH?

No trading platforms were removed. The index provider added Bitstamp during its scheduled quarterly review and did not remove any existing Constituent Trading Platforms.

Can the CoinDesk Ether Price Index used by Grayscale Ethereum Mini Trust ETF change in the future?

Yes. The filing states that the index provider may change the trading venues used to calculate the index price, or otherwise change how the index price is calculated, at any time, including through scheduled quarterly reviews.

Does this ETH filing include financial results or earnings information?

No. This 8-K focuses on an other event: a change in the Constituent Trading Platforms used for the CoinDesk Ether Price Index (ETX), rather than financial or earnings data.