MCK open interest by strike
From the closing options book · October 20, 2026 · updated after every close
At the October 20, 2026 close, MCK options within 45 days held 1,643 calls and 749 puts in open interest, a put/call ratio of 0.46. The biggest call strike near the money was 1030 and the biggest put strike 1000.
MCK open interest by strike, within 5% of the close
1030 carried 244 calls and 1000 carried 101 puts.
Open interest counts contracts still open after the close; it settles overnight. Large strikes are where dealer hedging is concentrated, which is why open interest feeds the gamma levels and max pain on the other MCK pages.
These are the October 20, 2026 closing numbers. Members see MCK's map move live all session.
Common questions
1,643 calls and 749 puts within 45 days at the October 20, 2026 close.
1030 near the money, with 244 contracts.
1000 near the money, with 101 contracts.
Compare: open interest by strike on other tickers
Measured from the closing options book and rebuilt after every close. Nothing on this page is live. Levels are where dealer hedging is concentrated, not targets or forecasts. Not investment advice.