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AI brief of an SEC Form 8-K · Grayscale Sui Staking ETF (GSUI)

Grayscale Sui Staking ETF adds Anchorage Digital as custodian for part of its SUI

Neutral Impact 2 of 5 product/contract Written later

The Sponsor, on behalf of the Grayscale Sui Staking ETF, entered into a Sixth Amendment on September 29, 2026 to the Master Custody Service Agreement with Anchorage Digital Bank N.A., making the Trust a party to the agreement. Coinbase Custody Trust Company remains the Trust's primary custodian, and the Sponsor has not yet decided how much SUI will move to Anchorage Digital.

Key points

  • Sixth Amendment dated September 29, 2026 to the Master Custody Service Agreement originally dated August 8, 2025
  • Coinbase Custody Trust Company, LLC remains the primary custodian; the Sponsor has not determined the amount of SUI to move to Anchorage Digital
  • Anchorage Digital must maintain insurance including commercial crime coverage or a fidelity bond with limits of not less than $100 million in the aggregate; the filing says shareholders cannot be assured coverage will be adequate

The filing

CompanyGrayscale Sui Staking ETF (GSUI)
Form8-K, current report
Filed with the SECOct 5, 2026, 4:48 PM ET
Accession number0001193125-26-414297

Items reported: 1.01 Material Definitive Agreement

Read the filing on SEC.gov ↗

Written by AI on Nov 9, 2026, 11:46 AM ET, from this filing only. Written later: this filing was briefed after the fact, when past filings were added to the site, so the brief may be read with hindsight; the filing itself is the record of what was known on October 05, 2026.

Briefs are written by AI from the filing text and can contain mistakes — open the filing before acting on anything. Impact (1-5) and tone are the AI's reading of the filing for shareholders, not a price forecast. Not investment advice.