Reading $868B Wrong: Why Susquehanna's 13F Isn't What It Looks Like

The Misconception Susquehanna International Group filed Q4 2025 with $868B in 13F assets — the 10th largest filer in the US. If you're building a portfolio analysis tool or doing quant research, this looks like a massive institutional bet on NVDA, SPY, TSLA, META, AAPL, MSFT. It's not. And misreading it will break your signal. What Susquehanna Actually Is SIG is a market maker and options specialist. Their 13F holdings are not directional bets — they're: Delta hedges — Long equity positions offset against short options Market-making inventory — Stock held to facilitate customer orders ETF arbitrage positions — ETF creation/redemption mechanics The Data Structure Problem The SEC's 13F form doesn't distinguish between: A hedge fund buying 1M shares of NVDA as a long-term bet A market maker holding 1M shares of NVDA to delta-hedge their options book Both file identical Form 13F entries. How to Filter Market Makers in Your Data # Identify likely market makers by breadth and options activit