SPY options: estimated premium turnover $1.3B; largest line SPY260821P00765000 $42M (expires 2026-08-21)SPY 期权异动：所扫描合约成交权利金估算约 $1.3B；最大合约 SPY260821P00765000 约 $42M（2026-08-21 到期）
Options Flow Snapshot
On August 21, 2026, State Street SPDR S&P 500 ETF (SPY) saw concentrated options activity: estimated same-day expiration option scanned contract premium turnover reached $1.32 billion, with total option volume of 3,238,950 contracts, equal to 4.3% of SPY’s underlying stock dollar volume. The largest active contract was the SPY260821P00765000 put option with a $765 strike price, generating ~$42.17 million in premium turnover. At-the-money (ATM) implied move was 0.565%, average near-the-money call implied volatility (IV) was 101.7%, average put IV was 67.6%, with a volatility skew of -34.1 percentage points (call IV higher than put IV). 6,454 near-the-money contracts were observed, with 1,261,921 call contracts and 1,977,029 put contracts, for a 0.64 call/put volume ratio. The single largest contract was 123,491 contracts of the August 21, 2026 $765 strike put.
Signal Read-Through
This signal combines concentrated put volume and an inverted volatility skew—standard SPY options activity typically sees higher put IV for downside protection, but this session saw call IV outpace put IV by 34.1 basis points. Elevated overall IV and tilted positioning toward puts indicate short-term options traders are leaning into downside hedges or bearish bets, with a notable disconnect from typical volatility pricing.
Fundamental and Event Cross-Check
Available independent data includes SPY’s May 28 and 29, 2026 SEC NPORT-P and N-30D filings, with no recent quarterly EPS or revenue reports on record. August 20, 2026 market headlines cover active ETF underperformance, S&P 500 year-end rally forecasts, household portfolio metrics, and macro rate outlooks, with no direct event tied to this day’s options activity. SPY’s underlying spot price closed at $762.6, down 0.84% from the prior session.
Follow-Up Markers
Track subsequent SPY option open interest changes, whether the large $765 put contract is closed or exercised ahead of expiration, and daily macroeconomic data releases impacting the S&P 500. This signal only reflects short-term options market pricing and concentrated positioning, and does not confirm the direction of SPY’s underlying price movement or long-term index trends.
期权成交结构
2026年8月21日，道富SPDR标普500 ETF（SPY）出现集中期权成交：当日到期的期权所扫描合约权利金成交额估算为13.23亿美元，总合约成交量3238950手，约为当日SPY现货成交额的4.3%。最大单笔活跃合约为SPY260821P00765000看跌期权，行权价765美元，权利金成交额约4217万美元；平值期权隐含波动幅度为0.565%，看涨期权平均隐含波动率101.7%，看跌期权平均67.6%，波动率偏斜达-34.1个百分点（看涨IV高于看跌IV）。
当日价内价外附近合约共6454手，看涨期权成交量1261921手，看跌期权1977029手，看涨看跌成交量比0.64；最大单笔看跌期权成交量达123491手。平值看涨、看跌期权的隐含波动率均为13.4%，但整体近价内期权的平均波动率显著抬升。
信号含义
该信号属于看跌期权主导的成交量集中叠加异常波动率偏斜（常规市场中看跌期权隐含波动率通常更高，此次出现反转），反映短期期权交易者倾向于做空套保或看跌押注，同时市场对SPY的短期波动定价显著升高。
基本面与事件交叉验证
可验证的独立信号包括SPY于2026年5月28日、29日提交的NPORT-P和N-30D SEC申报文件，公开数据显示其近期无季度每股收益或营收报告；8月20日有多篇市场新闻涵盖主动ETF表现、标普500年终反弹预测等内容，但无直接关联本次期权成交的事件披露。当日SPY现货价格报762.6美元，较前一交易日下跌0.84%。
后续关注
需关注后续SPY期权持仓变化、该大额看跌期权的平仓或行权情况，以及当日宏观数据对指数的影响。本信号仅反映短期期权市场的集中成交与定价，不证明标普500指数的长期趋势或单日实际涨跌方向。
This analysis was generated by InvestLog AI based on SEC filings, Form 4 insider transactions, Form 144 planned-sale notices, 13F institutional holdings, analyst ratings, and market data. It is for informational purposes only and does not constitute investment advice.这篇研究由 InvestLog AI 基于 SEC 披露、Form 4 内部人交易、Form 144 计划减持、13F 机构持仓、分析师评级和市场数据生成。内容仅供参考，不构成投资建议。