A banal strategy of profiting from index rebalancing emerged as one of Wall Street's hottest trades last quarter, driven by volatility and the historic SpaceX listing. The trade involves buying stocks set to join or selling stocks set to be dropped from indices before passive funds adjust. Index rebalancing generated a record $1.3tn in trading flows during Q2, double the quarterly average, per Min Moon at JPMorgan Chase.

The Nasdaq 100 inclusion of SpaceX alone pulled $4.3bn in passive flows. Simultaneously, Russell reconstituted and S&P rebalanced. Millennium Management, led by Izzy Englander, saw two teams net a combined $3.7bn in one month — SRBL led by Glen Scheinberg and another by Pratik Madhvani in Dubai. Larger firms leveraged broker borrowing to scale bets.

The strategy isn't new but cycles with risk. Marco Sammon at Harvard noted big players returning. Indices raced to change rules for SpaceX, paving way for Anthropic and OpenAI listings. Nasdaq slashed float requirements and introduced fast-track entry. However, SpaceX's $75bn float limited immediate index disruption, per Melissa Roberts at Stephens.