Spot Bitcoin exchange-traded funds drew more capital than they shed over the first 18 days of September, taking in $1.76 billion on positive-flow days against $1.45 billion in outflows, according to figures shared by Coin Bureau on X.

The figures, which span September 1–18, leave the funds with a net inflow of $313.4 million for the month to date. Capital entering spot Bitcoin ETFs outpaced withdrawals during the window, though the gap between the two totals was relatively narrow compared with the gross flows recorded in each direction.

Inflows Outpaced Outflows by Roughly $310 Million

Coin Bureau's data shows spot Bitcoin ETFs accumulated $1.76 billion across the days when net flows were positive between September 1 and September 18. Days marked by negative flows produced $1.45 billion in outflows over the same span, and the difference between the two figures produced the reported $313.4 million net inflow.

In other words, the positive-flow total was approximately $310 million higher than the negative-flow total over the period.

The figures offer a cumulative view of daily fund flows rather than a gauge of Bitcoin's price performance. ETF inflows and outflows changes in capital moving into or out of the funds and, on their own, do not establish the direction of the broader cryptocurrency market. Spot Bitcoin ETFs hold the asset itself and trade on conventional securities exchanges, and since the first U.S. products began trading in January 2024, their aggregated daily flow figures have become a widely followed dataset for gauging how investor capital is being allocated to Bitcoin.

Two-Way Capital Movement Underpins the Net Figure

The monthly net total masks considerable activity on both sides of the ledger. Investors added $1.76 billion on positive-flow days while pulling $1.45 billion out on negative-flow days, leaving the $313.4 million figure as the balance after those larger gross movements were set against each other. Because the net number is a residual of two much larger gross totals, the month-to-date balance is sensitive to how each individual trading day breaks.

Coin Bureau characterized the September figures as a bullish development, but the underlying numbers themselves describe ETF flows rather than a forecast for Bitcoin prices or future investor behavior.

Net Inflow Remains Positive Through September 18

With $313.4 million in net inflows through September 18, spot Bitcoin ETFs hold a positive cumulative flow for the first 18 days of the month, based on the figures cited by Coin Bureau. Whether that balance changes during the remainder of September will depend on the daily inflows and outflows still to come.

The dataset ends on September 18, so flows recorded over the rest of the month fall outside the reported period. These figures are compiled on a per-trading-day basis, so the cumulative balance will be refreshed with each new session's disclosure. As it stands, the reported figures show $1.76 billion in positive flows versus $1.45 billion in negative flows — a net inflow of $313.4 million.

Original report by Victoria Hale, Technology & Blockchain Writer, via HOKA.NEWS.