AI Stock Rout Reverses $270 Billion in Leveraged Positions at Major Dealers

The selloff began June 23 with semiconductor and software names dropping 8-12 percent intraday. Prime brokers reported margin calls on concentrated long positions built through total-return swaps and structured notes since late 2024. Data from dealer filings show average gross exposure to AI-related underlyings reached 4.2 times tangible equity at the five largest US banks by March 2026.

These structures allowed non-bank funds to obtain synthetic long exposure without direct ownership, while dealers hedged via listed options and single-stock futures. The reversal exposed the two-way flow: dealers booked positive carry in the rally but faced immediate mark-to-market losses once volatility spiked and borrow costs rose. No regulatory filing required position-level disclosure at this scale.

Market data indicate similar concentration patterns preceded the 2022 growth-stock correction, yet current leverage multiples exceed those levels. Central clearing data from the OCC show open interest in AI-linked equity options doubled year-over-year through May. The episode demonstrates how stated risk-management policies at dealer level diverge from actual net exposures once client flows dominate.

Next reporting cycle in August will reveal whether dealers reduced gross AI books or merely rolled hedges into longer-dated instruments. Sustained VIX readings above 22 would likely accelerate further compression.