Seven-Day Inflow Run Ends as Bitcoin ETFs Post $129M Outflows

Key Insights

• Bitcoin ETFs posted $129.62 million in net outflows on March 18.
• Fidelity’s FBTC recorded the largest single-day outflow of the session at $103.84 million.
• Ethereum ETFs also turned negative on the day with $55.51 million in outflows.

Bitcoin ETFs posted $129.62 million in net outflows on March 18, 2026, bringing a seven-day inflow streak to an end.

SoSoValue data shows the outflow day arrived after seven consecutive sessions of positive flows, dating back to March 9. During that time, US Bitcoin ETFs absorbed a combined $1.167 billion in net inflows.

Cumulative total net inflows across all US Bitcoin ETFs stood at $56.41 billion as of March 18.

Bitcoin ETFs Record First Outflow Day Since March 6

The last outflow day before March 18 was March 6, when Bitcoin ETFs shed $348.83 million in a single session. That day was the end of a two-day outflow period that also included $227.83 million in outflows on March 5.

The seven-day positive run lifted weekly totals to $767.33 million by March 13. The momentum carried into the partial week ending March 17. That week closed with $401 million in gains.

Fidelity’s Wise Origin Bitcoin Fund drove most of March 18’s outflows. It shed $103.84 million in value. That equalled 1,460 BTC, leaving the fund. Its cumulative net inflow now stands at $10.98 billion.

Grayscale’s Bitcoin Trust (NYSE: GBTC) recorded $18.82 million in outflows, or 264.24 BTC. Its cumulative net outflow position deepened slightly to $25.95 billion.

Bitwise’s Bitcoin ETF (NYSE: BITB) added $6.96 million in outflows across 97.77 BTC. This brings its cumulative net inflow to $2.15 billion.

Ark & 21Shares’ Bitcoin ETF reported zero net flows. VanEck’s Bitcoin ETF also recorded no activity. Invesco, Valkyrie, Franklin, WisdomTree, and Hashdex ETFs showed the same result. Grayscale’s Bitcoin Mini Trust likewise ended the day with zero net flows.

Seven-Day Streak Context: What the Run Produced

The seven-day inflow streak that ended on March 18 ran from March 9 through March 17. Daily figures across those sessions reached $167.03 million first.

They then climbed to $250.92 million. The next sessions posted $115.17 million and $53.87 million. Finally, totals came in at $180.33 million, $201.62 million, and $199.37 million.

Total value traded on March 17 reached $2.62 billion. Net assets climbed to $96.74 billion. That marked a rise from $88.34 billion at the start of the streak on March 9. The outflow on March 18 reduced cumulative total net inflows from $56.54 billion to $56.41 billion.

The partial week that includes both March 17’s inflow and March 18’s outflow is tracking at $401 million. The figure reflects the data cut available so far. It shows how quickly flows shifted within just two trading sessions. However, the final weekly total will depend on subsequent sessions.

Ethereum ETFs Turn Negative After Five Positive Sessions

Ethereum ETFs recorded $55.51 million in total net outflows on March 18, ending a run of five consecutive positive days.

Cumulative total net inflows for the Ethereum ETF category stood at $11.91 billion. With this, total net assets at the prior confirmed level of $13.75 billion from March 17.

Fidelity’s Ethereum Fund (CBOE: FETH) led outflows at $37.11 million, equal to 16,950 ETH. Grayscale’s Ethereum Trust (NYSE: ETHE) shed $8.89 million, or 4,060 ETH. This brought its cumulative net outflow to $5.16 billion.

VanEck’s Ethereum ETF (CBOE: ETHV) recorded $4.80 million in outflows across 2,190 ETH. At the same time, Bitwise’s Ethereum ETF (NYSE: ETHW) lost $4.70 million, equal to 2,150 ETH.

Grayscale’s Ethereum Mini Trust reported zero net flows. Franklin, Invesco, and 21Shares funds also ended the day with no activity.

A single outflow day does not erase the broader context for Bitcoin ETFs. The week ending March 17 produced $401 million in net inflows.

Ethereum spot ETFs posted $174.15 million in weekly net inflows. That marked their strongest weekly figure in the current run. The total rose from $160.82 million the week before.

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