Strategy and Strive Buy 2700 Bitcoin in a Week as US Spot ETFs Log Biggest Weekly Inflow Since 2025

Corporate bitcoin accumulation accelerated sharply in the final week of September 2026, with Strategy and Strive together spending $232.5 million to add more than 2,700 BTC. Strategy purchased 1,665 BTC for $142.7 million, lifting its total holdings to 847,666 BTC, while Strive spent $94.5 million to push its stack above 27,462 BTC, with SATA supplying 85% of the capital for Strive's latest tranche.

US spot Bitcoin ETFs reinforced the institutional appetite, pulling in $2.39 billion in weekly inflows, the largest weekly figure since 2025. Bitcoin itself rose 1.35% in a single hour to $84,173 on September 28, aided by short liquidations including a $2.94 million short position unwound on Binance's BTC perpetual futures market at $83,828.

Altcoins showed broad momentum alongside Bitcoin. CryptoQuant reported that 87% of altcoins on Binance had shifted into bullish momentum, though it flagged early warning signs for the rally. Altcoin spot trading volume reached its highest level since September 2025, nearing four times Bitcoin's spot volume as traders rotated into higher-risk assets. Gram, formerly Toncoin, gained 3.2% in one hour to $1.66.

On the Ethereum side, Bitmine crossed 6 million ETH in holdings, reaching 6,001,302 ETH as of September 27 after acquiring 17,362 ETH in the prior week. Polymarket US also launched 15-minute Bitcoin up/down prediction markets, extending short-duration crypto trading instruments to retail participants. Analyst Doctor Profit maintained a broadly bullish outlook on Bitcoin but cautioned that a correction could precede the next leg higher, citing elevated oil prices near $106 Brent as a potential macro headwind through inflation and Treasury yield pressure.