A September 20 Bloomberg report worth catching up on: Jane Street supplied about $1.2 billion notional of swaps to roughly 75 U.S. leveraged and inverse single-stock ETFs in the second quarter, after entering the business earlier this year. Its reported segment share was about 2%, versus 21% for Clear Street and 11% for Marex. The number measures swap notional, not trading revenue. This is a specific expansion into supplying the derivatives behind these products.

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