- Total options traded on Sept. 28: 10,158,300 contracts.
- Reported open interest at close: ~13,181,700 contracts.
- Daily volume ~103% of its 30‑day average (reported ratio 102.89%).
- Put volume: 52.52% of the day's total; call volume: 47.48%.
- Largest block: a put trade of 191,000 contracts at a $660 strike, expiring Dec. 18.
- Reported notional for that block: about $150 million (as stated in the report).
- Concentrated option blocks of this scale are atypical and can reflect substantial hedging by institutions or large directional bets.
- The strike ($660) and Dec. 18 expiry specify the price/timeframe of the exposure.
- Such activity can influence short‑term option‑implied volatility and market makers' hedging flows tied to QQQ.
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