Ten tokens held 62% of altcoin futures exposure, but shared collateral can put other positions at risk

Ten tokens accounted for 62% of outstanding altcoin futures exposure, known as open interest, in Talos’s weekly market report covering September 24–30, 2026. That concentrated exposure came with different financing burdens: the report put SOL funding below zero while PUMP funding reached +21.8% annualized.Published October 1, the market report also put altcoin open interest relative to market capitalization at 5.6%, a record in Talos’s series. For investors entering the October trading week, those numbers identify a concentrated derivatives footprint, while later Binance settlements show how quickly the cost of holding a particular contract can change.Funding pressure can change within hoursPerpetual futures use funding payments to help keep the contract price aligned with the underlying market. As Hyperliquid’s funding mechanics explain, positive rates transfer money from long holders to short holders. Negative rates reverse that direction. A trader’s financing burden therefore depends on the contract, side and funding interval, even when two tokens both have substantial open interest.The October 5 refresh covers two Binance contracts, rather than a matching update to Talos’s altc...