According to Farside Investors, U.S. spot Bitcoin ETFs posted a total weekly net outflow of $1,225.3 million, signaling net redemptions across the category (source: Farside Investors, farside.co.uk/btc; X post dated Oct 18, 2025). According to Farside Investors, the largest weekly outflows came from GBTC at -$298.3m, ARKB at -$289.5m, and IBIT at -$278.6m, which together comprised roughly 71% of the total net outflow (calculation based on Farside Investors data; source: Farside Investors, farside.co.uk/btc). According to Farside Investors, other flows were FBTC -$160m, BITB -$128.2m, BTCO -$11.1m, BRRR -$19.6m, HODL -$17.5m, and BTC -$22.5m, while EZBC and BTCW recorded zero net flow for the week (source: Farside Investors, farside.co.uk/btc). According to the U.S. Securities and Exchange Commission, ETF share redemptions reflect investors selling fund shares and can result in authorized participants redeeming creation units for underlying assets, linking primary market flows to underlying asset supply and demand dynamics that traders monitor in BTC markets (source: U.S. SEC, Investor Bulletin: Exchange-Traded Funds, sec.gov).

According to @FarsideUK, BlackRock’s Bitcoin ETF recorded a daily flow of negative 268.6 million US dollars on Oct 18, 2025, source: Farside Investors post on X and farside.co.uk/btc. Farside’s Bitcoin ETF flow dashboard lists daily fund flows in US dollars along with data notes and disclaimers for verification, source: farside.co.uk/btc.

According to Farside Investors, US Ethereum ETFs recorded total net outflows of USD 232.3 million on 2025-10-17, led by ETHA at USD 146.1 million, with additional outflows from FETH at USD 30.6 million, ETHE at USD 26.1 million, ETHW at USD 20.6 million, ETH at USD 4.7 million, and ETHV at USD 4.2 million, while TETH, QETH, and EZET reported zero net flow; data cited from Farside Investors’ X post on Oct 18, 2025 and flows dashboard at farside.co.uk/eth/. According to the U.S. Securities and Exchange Commission, ETF share creation and redemption can be conducted in cash or in-kind, meaning net outflows do not necessarily require immediate selling of the underlying asset in secondary markets; source: U.S. Securities and Exchange Commission ETF overview at sec.gov.

According to @FarsideUK, US spot Bitcoin ETFs recorded total net outflows of $366.6 million on 2025-10-17, based on the Farside Investors flow dashboard at farside.co.uk/btc. According to @FarsideUK, BlackRock’s iShares Bitcoin Trust (IBIT) saw -$268.6 million and Fidelity’s FBTC saw -$67.4 million, together accounting for roughly 91.8% of the day’s aggregate outflow. According to @FarsideUK, Grayscale’s GBTC posted -$25 million and Valkyrie’s BRRR recorded -$5.6 million, while BITB, ARKB, BTCO, EZBC, HODL, and BTCW reported zero net flow.

According to Farside Investors, BlackRock’s US Ethereum ETF recorded a net daily outflow of 146.1 million dollars in its latest update on Oct 18, 2025, source: Farside Investors. Farside Investors states the figure comes from its Ethereum ETF flow dashboard, which aggregates US spot ETH ETF creations and redemptions with published methodology and disclaimers, source: Farside Investors. Crypto traders monitor US ETH ETF flow prints as a short-term gauge of demand and liquidity around the US session for ETH, source: Kaiko Research.

According to @FarsideUK, Fidelity’s Bitcoin ETF posted a daily net outflow of $67.4 million, based on Farside Investors’ Bitcoin ETF flow tracker (source: @FarsideUK; farside.co.uk/btc). This issuer-level flow print adds to the daily dataset available from Farside Investors for monitoring BTC-related ETF demand and flow momentum (source: @FarsideUK; farside.co.uk/btc).

According to @FarsideUK, Fidelity’s US Ethereum ETF posted a daily net outflow of 30.6 million USD on Oct 18, 2025, with figures sourced from the Farside ETH flows dataset and disclosures at farside.co.uk/eth (source: Farside Investors tweet on Oct 18, 2025; Farside ETH flows page). The negative daily flow denotes that redemptions exceeded creations for Fidelity’s Ethereum ETF on that reporting day, as displayed on the Farside ETH flows dashboard (source: Farside ETH flows page at farside.co.uk/eth).

According to @FarsideUK, on Oct 18, 2025, the Invesco Bitcoin ETF recorded $0 million in daily net flow, as shown on the Farside Investors Bitcoin ETF flow tracker at farside.co.uk/btc. According to @FarsideUK, a $0 million daily flow indicates no net creations or redemptions were recorded for the fund that day. According to @FarsideUK, the figures are reported in US dollars and the full dataset and disclaimers are available on farside.co.uk/btc.

According to Farside Investors, the Solana ETF SSK (REX-Osprey) recorded a US$11.1 million daily flow on Oct 17, 2025, as reported on its Solana ETF flow tracker (source: Farside Investors, farside.co.uk/sol/). The firm directs users to its data page for full figures and disclaimers, confirming the reported daily flow metrics for SSK (source: Farside Investors, farside.co.uk/sol/).

According to @FarsideUK, the Bitwise Bitcoin ETF recorded $0 million in daily net flow on Oct 17, 2025, indicating no net creations or redemptions for the session (source: Farside Investors tweet on Oct 17, 2025; Farside ETF flow dashboard: farside.co.uk/btc/). @FarsideUK also states that 10% of profits from this Bitwise product are allocated to Bitcoin developers (source: Farside Investors tweet on Oct 17, 2025; Farside ETF flow dashboard: farside.co.uk/btc/).

According to @FarsideUK, the US VanEck spot Bitcoin ETF posted a net daily flow of $0 million on Oct 17, 2025, based on the Farside BTC ETF flow tracker, source: @FarsideUK on X Oct 17, 2025; farside.co.uk/btc. @FarsideUK also notes that 5% of profits from the VanEck Bitcoin ETF are allocated to Bitcoin developers, source: @FarsideUK on X Oct 17, 2025.

According to @FarsideUK, WisdomTree’s US Bitcoin ETF reported $0 million in daily net flow, indicating no net inflows or outflows for the day, source: Farside Investors via X and dataset, farside.co.uk/btc. With $0 million net flow, the fund’s BTC exposure from creations and redemptions was unchanged on the reported date, source: Farside Investors, farside.co.uk/btc. Full Bitcoin ETF flow tables and disclaimers are available at the source for cross-checking broader market flows, source: Farside Investors, farside.co.uk/btc.

According to @FarsideUK, the ARK 21Shares Bitcoin ETF (ARKB) recorded US$0 million net flow on Oct 17, 2025, based on the Farside Bitcoin ETF daily flow dashboard (source: Farside Investors; farside.co.uk/btc). With net flow at zero, ARKB showed no net primary-market creations or redemptions that day, indicating a neutral ETF-driven demand signal for BTC from this vehicle (source: Farside Investors; farside.co.uk/btc). For full context across issuers and official disclaimers, traders should review the complete US spot Bitcoin ETF flow table on Farside (source: Farside Investors; farside.co.uk/btc).

According to @FarsideUK, Farside Investors’ Bitcoin ETF Daily Flow tracker shows the Franklin US Bitcoin ETF recorded US$0 million net flow on Oct 17, 2025 (source: Farside Investors, farside.co.uk/btc). Farside Investors directs readers to its data and disclaimers page for methodology and full dataset coverage (source: Farside Investors, farside.co.uk/btc). For traders monitoring BTC, a zero daily flow in Farside’s dataset indicates no net inflows or outflows via primary creations or redemptions for that fund on the day, i.e., neutral ETF flow pressure (source: Farside Investors, farside.co.uk/btc).

According to Farside Investors, the Grayscale Bitcoin ETF (GBTC) recorded $0 million net flow on Oct 17, 2025, based on its US Bitcoin ETF daily flow tracker (farside.co.uk/btc/). According to Farside Investors, this flat daily reading reflects no net change in reported creations or redemptions for GBTC on the day, per its published dataset.

According to @FarsideUK, GBTC (Grayscale) posted a US$25 million net outflow on Oct 17, 2025, as shown on the Bitcoin ETF daily flow dataset at farside.co.uk/btc/ (source: Farside Investors tweet and data page). This figure represents GBTC’s daily net flow as reported by Farside Investors (source: farside.co.uk/btc/).

According to Farside Investors, Grayscale’s ETHE posted a US$26.1 million daily net outflow on Oct 17, 2025, as reported in its X update and verified on its Ethereum ETF flows dashboard at farside.co.uk/eth (source: Farside Investors on X dated Oct 17, 2025; Farside Investors Ethereum ETF flows page).

According to @FarsideUK, Farside Investors posted the term OP_RETURN and linked to a BitMEX Research post on Oct 17, 2025. Source: Farside Investors on X and BitMEX Research on X. OP_RETURN is a Bitcoin script opcode that stores arbitrary data in transactions and makes those outputs provably unspendable, influencing blockspace usage and the UTXO set. Source: Bitcoin.org Developer Guide and Bitcoin Wiki. Higher OP_RETURN usage increases average transaction size and can push fee rates higher, affecting short-term BTC transaction costs and miner fee revenue. Source: Bitcoin Optech Newsletter and Bitcoin.org fee market documentation. For trading, monitor mempool congestion and fee-rate bands to time BTC transfers and evaluate miner revenue sensitivity during periods of elevated OP_RETURN-driven activity. Source: mempool.space metrics and Bitcoin Optech analyses.

According to Farside Investors, the account drew attention to OP_RETURN by sharing a BitMEX Research post on X on Oct 17, 2025, without providing additional metrics in the post. Source: Farside Investors on X. The post links traders to BitMEX Research on X for the underlying OP_RETURN context and details. Source: BitMEX Research on X. OP_RETURN is a Bitcoin script opcode that embeds small pieces of data in provably unspendable outputs, which consumes blockspace and contributes to network load that traders track for fee risk. Source: Bitcoin.org Developer Guide; Bitcoin Core documentation. When demand for blockspace rises, fee rates tend to increase as blocks fill, raising on-chain transaction costs and the fee component of miner revenue that can affect BTC settlement timing and costs. Source: Bitcoin.org Fee Estimation Guide; Bitcoin Core policy documentation. Traders should monitor mempool size and sat/vB fee bands to gauge potential changes in BTC transaction costs and settlement latency around OP_RETURN-related activity. Source: mempool.space data. For specific context on today’s reference to OP_RETURN, review the linked BitMEX Research thread to align trading decisions with any identified changes in usage patterns. Source: BitMEX Research on X.

According to Farside Investors, US Ethereum ETF net flows totaled -$56.8 million on 2025-10-16, indicating a net redemption day across the category, source: Farside Investors (tweet dated Oct 17, 2025; dataset farside.co.uk/eth). Product-level flows were led by ETHE at -$69.0 million and offset by ETHA at +$46.9 million, with additional outflows from FETH (-$11.6 million), ETHW (-$15.8 million), EZET (-$2.9 million), and ETH (-$4.4 million), while TETH, ETHV, and QETH registered 0, source: Farside Investors (farside.co.uk/eth). ETHE comprised roughly 121% of the day’s net outflow while ETHA offset about 83% of redemptions, highlighting concentrated selling in ETHE alongside a single major inflow into ETHA, source: Farside Investors (farside.co.uk/eth). For full methodology and disclaimers, refer to Farside’s dataset, source: Farside Investors (farside.co.uk/eth).