SigFig Wealth Management clients added an estimated $73 million to U.S. spot Bitcoin ETFs during the third quarter, according to Galaxy Research, as investors await a broader wave of institutional holdings disclosures due by November 16.

The update came as U.S. spot Bitcoin ETFs recorded $110 million in net inflows on October 26, driven entirely by BlackRock's IBIT, while spot Ethereum ETFs posted $88.58 million in net outflows, according to data from SoSoValue.

SigFig Adds $73 Million as Bitcoin ETF Filings Continue

Alex Thorn, Head of Firmwide Research at Galaxy, reported on X that SigFig Wealth Management is a new filer whose clients increased their Bitcoin ETF holdings by $73 million during Q3.

The advisor manages approximately $2.8 billion to $3.6 billion in regulatory assets under management, and Thorn estimated the purchase represents 2% to 2.6% of SigFig's total assets. Across roughly 100,000 discretionary accounts averaging $34,000, he suggested the addition may reflect a model-portfolio decision. He stressed, however, that the figures are estimates and that his explanation remains speculative.

SigFig's clients gain exposure through retail accounts at institutions including Wells Fargo, Citizens, Santander and UBS — a distribution footprint that places the quarter's addition inside mainstream retail brokerage channels. Platform-level moves of this kind draw attention because a single model-portfolio decision can reposition thousands of small accounts simultaneously.

Filings Due by November 16 Will Detail September 30 Holdings

Thorn noted that many large asset managers and registered investment advisers file close to the November 16 deadline, and he expects approximately 97% of filings to be submitted by the end of that day. The disclosures will reveal Bitcoin ETF holdings as of September 30, 2026.

Such disclosures come through quarterly 13F filings, which institutional investment managers overseeing more than $100 million in qualifying securities must submit to the U.S. Securities and Exchange Commission within 45 days of each quarter's end — a reporting lag that makes mid-November the first standardized window into third-quarter positioning.

In his report, "Why Now Is the Time to Add and Hold BTC," Thorn said faster-moving investors reduced exposure during Q2, while sovereign investors and wealth managers increased their holdings. He expects that pattern may continue into Q3, although the upcoming filings will provide further evidence.

Flow Trends: From June Outflows to an October Slowdown

Separately, analyst Crypto Patel highlighted shifting Bitcoin ETF flows. Spot funds attracted $6.2 billion across August and September following $4.5 billion in net outflows in June, although October had recorded $203 million in net outflows at the time of his post. Patel also pointed to the Federal Reserve's rate decision as another factor for investors monitoring Bitcoin ETF flows.

Bitcoin Funds Gain While Ethereum ETFs Lose $88.58 Million

According to SoSoValue, U.S. spot Bitcoin ETFs attracted $110 million on October 26, with BlackRock's IBIT accounting for the entire net inflow and lifting its cumulative net inflows to $66.24 billion.

In contrast, spot Ethereum ETFs recorded $88.58 million in net outflows. Fidelity's FETH nevertheless attracted $16.13 million in individual fund inflows. BlackRock remains the world's largest asset manager, while Fidelity ranks among the largest U.S. investment firms.