JPMorgan (JPM) reduced lending to Jane Street for bond trading in 2025 as the US bank pushed into bond trading, according to FT

Prime brokers pulling or trimming credit lines to clients whose businesses overlap with their own is a long-running tension in the financing world: banks want the balances and flows that big prop trading clients bring, but competing desks inside the same house create obvious conflicts, and episodes of this kind have tended to surface when a bank is building share in the very product the client dominates. The mechanism here is specific: repo and secured financing for bond market-making inventory, where the size and pricing of a line directly shapes how much balance sheet a market maker can run, so a reduction by one major lender matters most if it is not replaced elsewhere at similar terms. Historically, large electronic market makers have been diversified across multiple financing counterparties precisely because single-bank dependence is a known vulnerability, and the usual sequence after such a move is quiet reallocation of the facility rather than any visible disruption. The distinction worth drawing is between a commercial decision driven by competition and one driven by risk appetite toward the client or the asset class; the former is idiosyncratic, the latter would be a tell about bank willingness to finance leveraged fixed income more broadly. Worth noting is whether peer banks absorb the line and whether financing spreads in Treasury and credit repo show any strain, which is where a wider pullback would first appear.