Microsoft Corporation closed at $491.71, advancing 0.90%.

Large options activity in MSFT pointed decisively bullish, headlined by a $4.18 million net-debit call calendar-vertical spread and a $1.42 million out-of-the-money put sale. The biggest structure combined 5,000-lot legs across September and October 2026 expirations, using short call premium to finance defined upside exposure, while the put sale expressed confidence that shares can remain above 455.0. Together, these trades reflect constructive sentiment and expectations for continued resilience rather than a bearish reversal.

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Options Indicators

MSFT’s implied volatility is 27.95%, and with an IV percentile of 39.44%, current option pricing sits in a neutral volatility regime rather than at an extreme. The IV/HV ratio of 0.49 suggests implied volatility is running below historical realized volatility, indicating that premiums are not especially rich at present and, overall, options appear fairly to modestly cheap rather than expensive. The Call/Put volume ratio is 1.52.

Large Trades

A call calendar-and-vertical spread package with a net debit of $4.18 million was the largest featured trade, built with 5,000-lot legs across September and October 2026 expirations. Specifically, the trader bought the 510.0 calls expiring 2026-10-16, sold the 525.0 calls expiring 2026-09-18, sold the 570.0 calls expiring 2026-10-16, and bought the 570.0 calls expiring 2026-09-18, with every leg out of the money versus the $491.71 reference stock price. This is best read as a call spread structure expressed across expirations, executed for a net debit of $4.18 million, which points to a directional bullish bet with defined upside targets while also using short call premium to reduce entry cost. Strategically, it suggests the trader is positioning for upside over time but with a measured view on how far MSFT may rise, rather than chasing unlimited upside.

A put sale worth $1.42 million was the other major trade, with 5,000 contracts of the 455.0 put sold for the 2026-09-18 expiration. With MSFT referenced at $491.71, that strike was out of the money at execution, making this a moderately bullish income-style position: the seller is effectively expressing confidence that shares can stay above 455.0 through expiration, while being willing to take assignment at a lower level if the stock weakens. Overall, the large-trade flow leans clearly bullish, as the biggest structure was a net-debit upside call spread/calendar expression and the other highlighted block was an out-of-the-money put sale, a combination that reflects constructive sentiment, willingness to finance bullish exposure with premium sales, and expectations for continued resilience in MSFT rather than a bearish reversal.

Strategy Reference

For a low assignment probability put-selling reference, consider the 430.0 strike for the 2026-09-18 expiration, which sits roughly 12.55% below the current price; alternatively, a bull call spread using the 510.0/525.0 strikes can cap margin while maintaining defined bullish exposure.