Grayscale Ethereum Trust ETF adds Bitstamp to Ether index

Grayscale Ethereum Trust ETF reported a change to the pricing benchmark it uses for ether.

Rhea-AI Filing Summary

Grayscale Ethereum Trust ETF reported a change to the pricing benchmark it uses for ether. CoinDesk Indices, Inc., which maintains the CoinDesk Ether Price Index (ETX) that underlies the Trust, added Bitstamp by Robinhood as a new digital asset trading platform in the index, effective December 21, 2025.

After this change, the index now reflects prices from Coinbase, Kraken, Crypto.com, LMAX Digital, Gemini, and Bitstamp. The index provider retains the ability to add or remove trading venues and conducts scheduled quarterly reviews to adjust the list of platforms based on its criteria, including minimum liquidity.

8-K Event Classification

Item 8.01 — Other Events

1 item

Item 8.01 Other Events Other

Voluntary disclosure of events the company deems important to shareholders but not covered by other items.

FAQ

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

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

The Trust disclosed that CoinDesk Indices, Inc. added Bitstamp by Robinhood as a new digital asset trading platform used in the CoinDesk Ether Price Index (ETX), which is the index supporting the Trust.

When did Bitstamp get added to the CoinDesk Ether Price Index for ETHE?

Bitstamp by Robinhood was added to the CoinDesk Ether Price Index (ETX) effective December 21, 2025.

Which trading platforms are now included in the Ether index used by Grayscale Ethereum Trust ETF?

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

Did the index provider remove any trading platforms in this update for ETHE?

No. CoinDesk Indices, Inc. did not remove any Constituent Trading Platforms as part of its scheduled quarterly review when it added Bitstamp.

Can the list of trading platforms in the CoinDesk Ether Price Index for ETHE change again?

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

Who is responsible for the Ether price index used by Grayscale Ethereum Trust ETF?

The Ether price index, the CoinDesk Ether Price Index (ETX), is maintained by CoinDesk Indices, Inc., referred to as the Index Provider.

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

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Accepted by SEC EDGAR 12/23/2025 - 04:22 PM Learn about SEC filing dates

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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 Trust ETF

(Exact name of Registrant as Specified in Its Charter)

Delaware			000-56193	82-6677805
(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 Trust ETF Shares		ETHE		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 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 year 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 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.