JPMorgan Cuts Financing for Jane Street's Bond Business
nashnova research
JPMorgan sharply reduced bond-trading financing to Jane Street last year after the prop-trading firm moved into U.S. Treasury market-making — Wall Street's biggest bank is cutting off the ammunition supply to a rival it helped build.
Why did JPMorgan pull the plug?
Jane Street expanded from behind-the-scenes bond trading into U.S. Treasury market-making — putting it on the same order book as JPMorgan's own desk.
JPMorgan traders were blunt: the bank's fixed-income financing was helping a client build the muscle to take their market share.
In plain terms = the bank was earning fees on the very capital its competitor used to undercut it — and eventually chose to stop.
How big was the cut?
The reduction was roughly 5% of Jane Street's total fixed-income financing across all bank counterparties — not material to its 2025 revenue.
Jane Street traded over $900 billion in bonds last year and earned $40 billion in trading revenue — just $1 billion less than JPMorgan.
This means → Jane Street is no longer a niche player; its scale now rivals the largest Wall Street bank in the same business.
Is this only about Jane Street?
No. JPMorgan previously took similar steps against Citadel Securities — cutting some trading services after Citadel launched client offerings that competed with JPMorgan's equities business.
CEO Jamie Dimon named Citadel Securities as an emerging competitor in his April 2025 shareholder letter.
This reflects a systematic shift: Wall Street banks are re-evaluating financing relationships that effectively subsidize their own rivals — not a one-off, but a strategic pivot.
How much ground have prop-trading firms taken?
According to Crisil Coalition Greenwich, proprietary-trading firms now account for 10% of total industry revenue in fixed income, currencies, and commodities as of 2025.
The driver is electronic-platform migration in bond markets — Jane Street, Citadel Securities, and peers are the prime beneficiaries.
In plain terms = bond trading used to run on phone calls and voice negotiation; it increasingly runs on electronic platforms — and electronic trading is these firms' home turf.
Does Jane Street itself carry risk?
Yes. Jane Street reportedly posted roughly $15 billion in losses in July from bets on AI stocks and an investment in a hedge fund run by 24-year-old Leopold Aschenbrenner.
Prop-trading firms trade with their own capital but typically use bank financing to amplify returns — if banks tighten further, the leverage shrinks, and the loss buffer thins.
This means → whether banks keep tightening is both a competitive tactic and a potential accelerant when the rival is already vulnerable — making it the key variable to watch as this competitive landscape evolves.
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