Bitcoin ETF Inflows Hit $179M in a Day as Weekly Total Reaches $734M (March 18)
U.S. spot Bitcoin BTC +0.00% ETFs recorded net inflows of 2,492 BTC, worth approximately $179.33 million, on March 18, 2026. The daily figure extends a broader trend of institutional buying, with 7-day cumulative net inflows reaching 10,210 BTC, or roughly $734.63 million.
Bitcoin ETFs Pull $179M in a Single Day, $734M Over the Past Week
The March 18 snapshot shows consistent demand for U.S. spot Bitcoin ETF products. On a single-day basis, net inflows totaled +2,492 BTC (+$179.33M), according to Bitbo ETF flow data.
Over the trailing seven days, that pace accumulated to +10,210 BTC (+$734.63M) in net new capital entering spot Bitcoin ETF wrappers. Both the BTC-denominated and USD-denominated figures point to sustained buying pressure rather than a single large allocation on one day.
Granular issuer-level breakdowns, which track how much of the total flowed into products from BlackRock’s iShares Bitcoin Trust (IBIT), Fidelity’s FBTC, ARK 21Shares’ ARKB, and others, were not fully captured in the available data snapshot. Readers tracking individual fund performance can consult Farside Investors’ full ETF flow dataset for a per-fund breakdown.
Ethereum ETF Flows on March 18
The same data snapshot that captured Bitcoin ETF flows also included Ethereum ETH +0.00% ETF figures. However, the full Ethereum numbers were truncated in the original data release, leaving the complete 1-day and 7-day ETH ETF net flow totals partially unavailable at the time of reporting.
What is known is that U.S. spot Ethereum ETFs, which began trading in mid-2024, have historically shown lower and more volatile flow patterns compared to their Bitcoin counterparts. Daily ETH ETF flows have frequently swung between modest inflows and outflows even during periods when Bitcoin ETFs attracted consistent capital.
Whether Ethereum ETF flows moved in the same positive direction as Bitcoin on March 18 is a key signal for institutional crypto exposure broadly. Agreement between BTC and ETH fund flows suggests a risk-on tilt across digital assets, while divergence, where Bitcoin attracts capital and Ethereum does not, tends to reflect a more selective institutional posture favoring Bitcoin’s relative liquidity and regulatory clarity.
Complete Ethereum ETF flow data can be tracked through CoinGlass ETF dashboards, which cover both BTC and ETH products.
What Sustained Weekly Inflows Signal for Institutional Demand
A 7-day net positive of +10,210 BTC ($734.63M) is not statistical noise. At that pace, spot Bitcoin ETFs are absorbing the equivalent of roughly 1,459 BTC per day, well above the approximately 450 BTC produced daily through mining rewards post-halving.
The direction of the trend matters as much as the magnitude. Earlier in March 2026, U.S. Bitcoin ETF net flows turned positive for the first time in five weeks, snapping a streak of weekly outflows that had pressured sentiment. The current weekly total suggests that reversal has gained traction rather than fading after a single session.
Bitwise CIO Matt Hougan recently noted that institutional holders largely maintained their positions even through Bitcoin’s sharp drawdowns, a pattern he described as “diamond hands” behavior among allocators. That framing aligns with the current data: steady accumulation through ETF channels despite broader macro uncertainty, as reported by CoinDesk.
On the macro calendar, the Federal Reserve’s March FOMC meeting is the next major scheduled event that could shift ETF flow direction. Rate decisions and forward guidance from the Fed have historically correlated with short-term swings in risk-asset allocations, including crypto ETF positioning.
For now, the data shows that institutional buyers are net adding Bitcoin exposure through regulated ETF products at a pace that outstrips new supply. Whether that pace accelerates, holds, or reverses will depend on the interplay between macro signals, Bitcoin’s price action, and the appetite of allocators who have been steadily building positions through the first quarter of 2026.
Disclaimer: This article is for informational purposes only and does not constitute financial or investment advice. Cryptocurrency and digital asset markets carry significant risk. Always do your own research before making decisions.
