Patch Notes #197 — Diamond Hands and Circuit Breakers
GameStop. The fortnight a subreddit executed the most public short squeeze in market history and every system this archive tracks, market microstructure, platform incentives, mob coordination, clearing-house plumbing, collided in one ticker. The mechanics, filed properly: WallStreetBets identified that GameStop was shorted beyond 100% of its float (an over-leveraged position visible in public data), coordinated a buy-and-hold spiral with meme-grade conviction (“diamond hands,” rocket emojis as consensus protocol), and drove the stock from ~$20 to an intraday ~$483, detonating a hedge fund (Melvin, bailed out mid-squeeze) and briefly making the joke stock worth more than half the S&P’s members. Then the infrastructure spoke: Robinhood, the retail platform whose whole brand was democratized access, restricted buying (sell-only) at the squeeze’s peak, and the conspiracy theories wrote themselves until the mundane truth emerged, which this blog appreciated alone in a crowd screaming about villains: clearing-house collateral requirements. Two-day settlement (T+2) means Robinhood fronts risk on every trade for 48 hours; the volatility spiked their deposit requirement tenfold overnight (a multi-billion-dollar margin call at 5am); and restricting buys was the position-limiting move available. The plumbing nobody knew existed became the story everyone got wrong (the old oil-contango lesson: the price is a fact about the mechanism, and the mechanism has capacity limits, always, everywhere, forever). ...