Merck & Co. (MRK) options flow
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Options flow session · Last trade
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Session chart data
| Strike (USD) | Net GEX per 1% move (USD) |
|---|---|
| $110 | -$1,147,531 |
| $130 | -$5,640,979 |
| $135 | -$5,690,785 |
| $138 | -$1,546,020 |
| $145 | $2,531,894 |
| $147 | $2,922,334 |
| $150 | $5,567,472 |
| $155 | $4,507,750 |
| $160 | $4,629,390 |
| $165 | $3,725,869 |
| $170 | $4,040,580 |
| $175 | $1,822,179 |
MRK session snapshot
Bullflow recorded 18 MRK options trades on Monday, October 26, 2026, totaling $1,805,294 in premium. Calls made up $684.27K (37.9%) across 9 trades and puts $1.12M (62.1%) across 9 trades, a put/call premium ratio of 1.64.
13 trades were sweeps and 5 were blocks. 10 filled at or above the ask, 7 at or below the bid and 1 at the mid. The largest was a $456,000 block of 1,000 Nov 20, 2026 $140 Put trade at 13:34:54 ET, filled at the bid.
MRK closed at $140.61, down 3.21% from the prior close. Net gamma exposure was $13.31M per 1% move at the Oct 26, 2026, 15:59:25 ET snapshot; the largest positive GEX strike was $150. By premium, MRK ranked 3 of 3 among the related tickers below.
- Company
- Merck & Co., Inc.
- Exchange
- NYSE
- Sector
- Healthcare
- Close
- $140.61
MRK options flow statistics
- Total premium
- $1.81M
- Recorded trades
- 18
- Call premium
- $684.27K
- Put premium
- $1.12M
- Put/call premium ratio
- 1.64
- Avg premium per trade
- $100.29K
- Calls / puts (trades)
- 9 / 9
- Sweeps / blocks
- 13 / 5
- At or above ask
- 10
- At or below bid
- 7
- Largest trade
- $456.00K
- Last trade
Where the premium went
in calls
$1.81M · 18 trades
Premium
Trade type
Fill side
MRK largest options trades
| Time | Contract | C/P | Premium | Size | Fill | Type |
|---|---|---|---|---|---|---|
| MRK Nov 20, 2026 $140 | Put | $456,000 | 1,000 | Bid | Block | |
| MRK Dec 17, 2027 $155 | Call | $337,500 | 225 | Ask | Sweep | |
| MRK Nov 20, 2026 $147 | Put | $171,660 | 188 | Above Ask | Sweep | |
| MRK Nov 13, 2026 $140 | Call | $123,750 | 225 | Bid | Sweep | |
| MRK Mar 19, 2027 $140 | Put | $101,200 | 92 | Bid | Block | |
| MRK Dec 18, 2026 $135 | Put | $93,500 | 250 | Bid | Block | |
| MRK Jan 15, 2027 $140 | Put | $79,500 | 100 | Bid | Sweep | |
| MRK Jan 15, 2027 $140 | Put | $78,500 | 100 | Bid | Sweep | |
| MRK Sep 17, 2027 $120 | Put | $77,000 | 100 | Ask | Sweep | |
| MRK Oct 30, 2026 $140 | Call | $64,600 | 170 | Mid | Sweep | |
| MRK Oct 30, 2026 $140 | Call | $48,190 | 122 | Ask | Sweep | |
| MRK Nov 20, 2026 $134 | Put | $35,168 | 157 | Ask | Sweep |
2 of the 12 largest trades, $158.00K combined
The 12 largest trades total $1.67M of $1.81M
MRK gamma exposure
- Spot at snapshot
- $140.44
- Net GEX per 1% move
- $13.31M
- Largest positive strike
- $150
- Largest negative strike
- $135
Closing snapshot , 65 strikes across 15 expirations (Unavailable to Unavailable).
MRK options flow questions
What was the largest MRK options trade on October 26, 2026?
A $456,000 block of 1,000 MRK Nov 20, 2026 $140 Put trade at 13:34:54 ET, filled at the bid. It was the largest of 18 trades Bullflow recorded for MRK that session.
How much MRK options premium traded on October 26, 2026?
$1,805,294 across 18 recorded sweeps and blocks: $684,266 in calls (9 trades) and $1,121,028 in puts (9 trades).
Was MRK options flow bullish or bearish on October 26, 2026?
Calls were 37.9% of premium (put/call premium ratio 1.64). 7 of 18 trades filled at or below the bid and 10 at or above the ask. Premium and fill side do not show whether a trade opened or closed a position or was a hedge, so they do not establish direction on their own.
What are MRK's gamma exposure levels?
At the Oct 26, 2026 closing snapshot (15:59:25 ET, spot $140.44), MRK net GEX was $13.31M per 1% move. The largest positive GEX strike was $150. The largest negative GEX strike was $135. The snapshot covers 65 strikes and 15 expirations.
How does MRK options flow compare with related stocks?
MRK ranked 3 of 3 by premium on Oct 26, 2026 among the tickers shown here. MRNA $36.86M, UNH $1.88M, MRK $1.81M led; MRK recorded $1.81M.
How often is MRK options flow data updated?
The page shows a completed session (October 26, 2026, last trade 15:48:46 ET) and updates after the next trading day becomes historical. Intraday MRK flow is in the Bullflow dashboard and API.
How to read this data
This summary covers recorded single-leg sweeps and blocks with positive premium, excluding cancelled trades. It describes the covered flow, not all options-market volume. Total premium is gross traded premium; it is not net buying pressure. The interactive dashboard can use different filters and may show different totals.
Calls, puts, and execution near the bid or ask provide context but do not establish whether a position was opened or closed, whether it was part of a hedge, or where the stock will move next. The session updates after the next trading day becomes historical.
Stock prices show regular-session candles delayed at least 15 minutes. The latest view refreshes during market hours; the flow-session view places recorded trades on their original date, using interpolated stock prices between candle samples. Gamma exposure shows its separately dated public closing snapshot.