Jane Street Enters Leveraged ETF Swaps Business With $1.2B Notional

Jane Street's entry matters less for its current 2% share than for what it signals: a major proprietary trading firm is now willing to warehouse the swap exposure that leveraged and inverse single-stock ETFs depend on. That counterparty function has been dominated by a handful of names, so a new balance sheet in the mix could matter for how these products source exposure and for concentration risk if any single provider steps back. The open question is whether Jane Street scales toward the incumbents or treats this as a niche book.