Spot BTC ETFs add $241M third week

TLDR

US spot Bitcoin ETFs saw about $241 million of net inflows last week, marking a third straight week of positive flows.

1. US spot Bitcoin ETFs added roughly $241 million over the week, extending a three week inflow streak while cumulative net inflows climbed to about $57.8 billion.
2. ETF demand remains a structural tailwind for Bitcoin, with spot products now holding around 6.4% of BTCs market value even as weekly inflows slow sharply.
3. The key watchpoints are whether inflows stay positive, how concentrated they remain in BlackRocks IBIT, and how ETF flows respond to macro shocks and regulation.

Deep Dive

1. Three Weeks Of Inflows

Data aggregators report that US spot Bitcoin ETFs recorded about $241 million in net inflows for the week ending 2 October, their third consecutive positive week of flows. One breakdown shows BlackRocks iShares Bitcoin Trust (IBIT) leading with roughly $450 million of net inflows, while several rival funds saw net redemptions.

According to SoSoValue based reporting, the same products had added about $2.4 billion and $6.2 billion in the two prior weeks, taking cumulative net inflows to around $57.8 billion and pushing year to date flows back into positive territory. Another tally notes that six of the last seven weeks have ended with net inflows, suggesting the recent streak is not an isolated blip.

2. Why The Flows Matter

Spot Bitcoin ETFs now hold roughly $108.9 billion in net assets, or about 6.42% of Bitcoins market capitalization, based on recent estimates that aggregate the full product set. One report from TokenPost places spot ETF holdings at this level and notes that cumulative net inflows sit near $57.79 billion, highlighting how much BTC has migrated into regulated vehicles over less than three years (source).

By comparison, Ether ETFs swung to about $138 million in net outflows over the same week after a strong prior week, and Zcash funds recorded their first weekly outflow on record. This divergence reinforces Bitcoins reserve asset role in portfolios, especially when macro uncertainty is high and investors prefer the most established asset.

3. What To Watch Next

First, the pace matters. One analysis from Bitcoin.com notes that the $241 million weekly haul is roughly 90% lower than the prior periods $2.39 billion, even though it keeps the streak intact, and that Septembers total ETF inflows of $2.65 billion were the second strongest since October 2025 (market update). Sustained smaller inflows still support price, but a return to net outflows would quickly change the narrative.

Second, flows are heavily concentrated in IBIT, which captured more than the categorys net total. If that concentration persists, smaller issuers may struggle to keep assets, and any reversal in IBIT flows could have outsized impact on aggregate numbers.

Third, macro and regulatory shocks remain the swing factors. Elevated yields, equity volatility, or new ETF launches in other jurisdictions can all redirect flows between Bitcoin, Ether and altcoin products, so watching weekly flow data alongside broader risk sentiment is important.

Conclusion

Spot Bitcoin ETFs adding $241 million for a third straight inflow week signals that institutional and advisor demand for BTC remains intact, even if it has cooled from prior highs. With ETFs now holding a significant share of Bitcoins market value, continued net buying supports a structural bid, while any renewed wave of redemptions could quickly weaken that support. For now, flows are a mild positive, and the balance between ETF demand, macro conditions and competing crypto products will shape the next phase of Bitcoins cycle.