MRK options flow
From the October 21, 2026 session tape · published after the close
MRK options traded $5.2M in premium across 171 prints on October 21, 2026: 61% in calls and 39% in puts, with 0% in contracts expiring that day. That was 169% of its average session over the prior 19.
MRK largest options trades, October 21, 2026
| Time | Contract | Size | Price | Premium |
|---|---|---|---|---|
| 16:00 | 160C Oct 30 | 3,382 | $1.40 | $473K |
| 14:46 | 150P Oct 30 | 580 | $5.38 | $312K |
| 12:32 | 130P Jan 15 | 1,200 | $2.51 | $301K |
| 10:43 | 130P Jan 15 | 1,206 | $2.47 | $298K |
| 14:46 | 150C Oct 30 | 580 | $4.24 | $246K |
| 13:53 | 160C Oct 30 | 1,935 | $1.22 | $236K |
| 14:33 | 150P Oct 30 | 420 | $5.44 | $228K |
| 13:25 | 147P Nov 20 | 353 | $5.10 | $180K |
| 14:06 | 160C Oct 30 | 1,288 | $1.26 | $162K |
| 14:33 | 150C Oct 30 | 263 | $4.19 | $110K |
| 14:33 | 160C Oct 30 | 806 | $1.25 | $101K |
| 16:00 | 160C Nov 20 | 380 | $2.61 | $99K |
| 16:00 | 170C Oct 30 | 3,372 | $0.25 | $84K |
| 14:20 | 150C Jan 15 | 83 | $8.90 | $74K |
| 14:19 | 130P Jan 15 | 248 | $2.51 | $62K |
The largest single MRK print was a 160 call expiring Oct 30 for $473K at 16:00 ET.
The busiest strikes by premium were 160 calls ($1.3M), 130 puts ($705K), 150 calls ($545K), 150 puts ($541K).
Last 20 sessions of MRK premium, calls vs puts: Oct 15 $7.4M (86% calls) · Oct 16 $3.0M (88% calls) · Oct 19 $3.0M (81% calls) · Oct 20 $4.7M (47% calls) · Oct 21 $5.2M (61% calls).
A large print is a trade, not a verdict: it can be a hedge, a close, or one leg of a spread. Read it next to where dealers are positioned, on the other MRK pages.
These are the October 20, 2026 closing numbers. Members see MRK's map move live all session.
Common questions
$5.2M in premium across 171 prints, 61% calls. The largest print was a 160 call for $473K.
61% of premium was in calls. Premium alone does not show direction: buyers and sellers, hedges and spreads all print the same way.
No. This page shows the last completed session, published after the close. Members see the flow as it prints.
Compare: options flow 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.