Grayscale Avalanche Staking ETF adds custody exhibits

The added exhibits document custody arrangements involving Anchorage Digital Bank and the ETF's sponsor.

Rhea-AI Filing Summary

Grayscale Avalanche Staking ETF submitted a post-effective amendment solely to add two exhibits to its registration statement: a Master Custody Service Agreement dated August 8, 2025, and a Sixth Amendment dated September 29, 2026. The original agreement is between Anchorage Digital Bank N.A. and each client listed on its order form; the amendment is between Anchorage Digital Bank N.A. and Grayscale Investments Sponsors, LLC, on behalf of itself and listed entities. The amendment became effective immediately upon filing under Rule 462(d).

Key Terms

post-effective amendment, Rule 462(d), Master Custody Service Agreement

3 terms

post-effective amendment regulatory

"Post-Effective Amendment No. 3"

A post-effective amendment is an official update to a securities registration document filed after that document has become effective with regulators; it corrects, adds or replaces information about the securities, the company, or an offering. Investors care because it keeps the legal record current and can change what is being sold or the rights attached to shares — like getting a revised product manual after a launch that may affect value or use.

Rule 462(d) regulatory

"pursuant to Rule 462(d)"

A Securities and Exchange Commission procedural rule that lets a company quickly register additional shares by re-using an already effective registration filing, rather than submitting a full new application. For investors this matters because it speeds up the issuance of more stock—similar to printing extra tickets from an approved batch—so it can increase supply, dilute existing ownership, and signal a near-term capital raise or financing plan.

Master Custody Service Agreement technical

"Master Custody Service Agreement"

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Available on EDGAR 10/05/2026 - 06:01 PM Accepted by SEC EDGAR 10/05/2026 - 04:53 PM Learn about SEC filing dates

As filed with the Securities and Exchange Commission on October 5, 2026

Registration No. 333-289829

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Post-Effective Amendment No. 3

to

FORM S-1

REGISTRATION STATEMENT
UNDER
THE SECURITIES ACT OF 1933

Grayscale Avalanche Staking ETF

(Exact Name of Registrant as Specified in Its Charter)

Delaware	6221	99- 6715858
(State or Other Jurisdiction of Incorporation or Organization)	(Primary Standard Industrial Classification Code Number)	(I.R.S. Employer Identification Number)
	c/o Grayscale Investments Sponsors, LLC 290 Harbor Drive, 4th Floor Stamford, Connecticut 06902 (212) 668-1427
(Address, Including Zip Code, and Telephone Number, Including Area Code, of Registrant’s Principal Executive Offices)

Kathryn Masci

Interim Chief Financial Officer

Grayscale Investments Sponsors, LLC
290 Harbor Drive, 4th Floor
Stamford, Connecticut 06902
(212) 668-1427

(Name, Address, Including Zip Code, and Telephone Number, Including Area Code, of Agent For Service)

Copies to:

Hillary A. Coleman
Matthew T. DeSilva
Davis Polk & Wardwell LLP
450 Lexington Avenue
New York, New York 10017
(212) 450-4000

Approximate date of commencement of proposed sale to the public: As soon as practicable after the effective date of this Registration Statement.

If any of the securities being registered on this form are to be offered on a delayed or continuous basis pursuant to Rule 415 under the Securities Act of 1933, check the following box. ☒

If this form is filed to register additional securities for an offering pursuant to Rule 462(b) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering. ☐

If this form is a post-effective amendment filed pursuant to Rule 462(c) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering. ☐

If this form is a post-effective amendment filed pursuant to Rule 462(d) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering. ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer ☐	Accelerated filer ☐
Non-accelerated filer ☒	Smaller reporting company ☒
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 7(a)(2)(B) of the Securities Act. ☒

This post-effective amendment shall become effective upon filing with the Securities and Exchange Commission in accordance with Rule 462(d) under the Securities Act of 1933, as amended.

EXPLANATORY NOTE

This Post-Effective Amendment No. 3 to the Registration Statement on Form S-1 (File No. 333- 289829) of Grayscale Avalanche Staking ETF (the “Registration Statement”) is being filed pursuant to Rule 462(d) under the Securities Act of 1933, as amended (the “Securities Act”), solely for the purpose of filing additional exhibits to the Registration Statement. Accordingly, this Post-Effective Amendment No. 3 consists only of a facing page, this explanatory note and Part II of the Registration Statement on Form S-1 setting forth the exhibits being added to the Registration Statement. This Post-Effective Amendment No. 3 does not modify any provision of Part I or Part II of the Registration Statement other than the additions to Item 16 of Part II as set forth below. Pursuant to Rule 462(d) under the Securities Act, this Post-Effective Amendment No. 3 shall become effective immediately upon filing with the Securities and Exchange Commission.

PART II

INFORMATION NOT REQUIRED IN PROSPECTUS

Item 16. Exhibits and Financial Statement Schedules

(a)The following additional exhibits are filed as part of this registration statement:

Exhibit Number	Description
10.1	Master Custody Service Agreement, dated as of August 8, 2025, by and between Anchorage Digital Bank N.A. and each Client listed on the Order Form attached thereto.
10.2	Sixth Amendment to the Master Custody Service Agreement, dated as of September 29, 2026, by and between Anchorage Digital Bank N.A. and Grayscale Investments Sponsors, LLC, on behalf of itself and each entity listed on the Order Form attached thereto.

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933, the registrant has duly caused this registration statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Stamford, Connecticut, on October 5, 2026.

GRAYSCALE INVESTMENTS SPONSORS, LLC as Sponsor of Grayscale Avalanche Staking ETF
By:	/s/ Kathryn Masci
Name:	Kathryn Masci
Title:	Member of the Board of Managers and Interim Chief Financial Officer*

Pursuant to the requirements of the Securities Act of 1933, this registration statement has been signed by the following persons in the capacities and on the dates indicated.

Signature		Title		Date
#		Member of the Board of Managers		October 5, 2026
Peter Mintzberg		and Chief Executive Officer* (principal executive officer)
/s/ Kathryn Masci		Member of the Board of Managers		October 5, 2026
Kathryn Masci		and Interim Chief Financial Officer*
		(principal financial and principal accounting officer)
# Craig Salm		Member of the Board of Managers and Chief Legal Officer*		October 5, 2026

* The Registrant is a trust and the persons are signing in their capacities as officers and managers of Grayscale Investments Sponsors, LLC, the Sponsor of the Registrant.

#/s/ Kathryn Masci

Kathryn Masci, as attorney-in-fact