What is the current MRK expected move?

As of Aug 14, 2026, Merck & Co., Inc. (MRK) has an expected move of 7.10% over the next 28 days, implying a one-standard-deviation price range of $125.82 to $145.06 from the current $135.44. The expected move is derived from at-the-money straddle pricing and represents the market consensus for a ±1σ price move.

What does the MRK expected move mean for traders?

Roughly 68% of outcomes should fall within ±1 expected move and 95% within ±2 under lognormal assumptions, though equity returns have empirically fatter tails than log-normal predicts. Strategies sized to the expected move (iron condors at ±1σ, strangles at ±1.5σ) target the typical outcome distribution; strategies that profit from tail moves (long-vol structures, ratio backspreads) target the tails the lognormal model under-prices.

How is MRK expected move calculated?

The expected move displayed here is derived from at-the-money implied volatility scaled to the chosen tenor: expected move % is approximately ATM IV times sqrt(T / 365), where T is days to expiration. An equivalent straddle-based form: the ATM straddle (call + put at the same strike) is roughly sqrt(2/pi) times spot times IV times sqrt(T/365), so the implied one-standard-deviation move is approximately 1.25 times ATM straddle divided by spot. The two formulations agree once the sqrt(2/pi) constant is reconciled.

Merck & Co., Inc. (MRK) Expected Move

Expected move estimates the probable price range for a given period based on at-the-money options pricing. It reflects the market consensus for volatility over the selected timeframe.

Merck & Co., Inc. (MRK) operates in the Healthcare sector, specifically the Drug Manufacturers - General industry, with a market capitalization near $328.31B, listed on NYSE, employing roughly 74,000 people, carrying a beta of 0.21 to the broader market. Merck & Co. Led by Robert Davis, public since 1978-01-13.

Snapshot as of Aug 14, 2026.

Spot Price: $135.44
Expected Move: 7.1%
Implied High: $145.06
Implied Low: $125.82
Front DTE: 28 days

As of Aug 14, 2026, Merck & Co., Inc. (MRK) has an expected move of 7.10%, a one-standard-deviation implied price range of roughly $125.82 to $145.06 from the current $135.44. Expected move is derived from at-the-money straddle pricing and represents the market's pricing of a ±1σ move. Roughly 68% of outcomes should fall within this range under lognormal assumptions, though empirical markets have fatter tails.

MRK Strategy Sizing to the Expected Move

With Merck & Co., Inc. pricing an expected move of 7.10% from $135.44, risk-defined strategies sized to the implied range structurally target the modal outcome distribution. Iron condors with wings at the ±1σ expected move boundaries collect premium against the ~68% probability that spot stays inside the range under lognormal assumptions; strangles set wider at ±1.5σ or ±2σ target the tails but pay smaller per-trade premium. Long-vol structures (long straddles, ratio backspreads) profit when realized move exceeds the implied move, the inverse trade: they bet against the lognormal assumption itself, capitalizing on the empirically fatter equity-return tails.

How to read the MRK implied-range chart

The shaded range above shows the one-standard-deviation implied price band at each listed expiration, derived from ATM implied volatility scaled to days-to-expiration. The front-tenor expected move is 7.10%, anchoring an implied range of approximately $125.82 to $145.06. Under lognormal assumptions, roughly 68% of outcomes fall inside that band; 95% fall inside ±2σ; 99.7% inside ±3σ. The empirical equity-return distribution has fatter tails than lognormal, so true tail-outcome frequency is moderately higher than these closed-form numbers suggest.

MRK expected move and event pricing

Expected move widens with √time: a 5% 30-day move corresponds to roughly a 2.5% 7.5-day move and a 10% 120-day move. MRK term-structure is in contango (slope 0.014), so longer-dated tenors price in proportionally more vol than √time scaling alone would suggest - typically because long-dated cycles include uncertain macro states. With IV rank at 26.1%, the implied move is at the low end of the typical MRK range - cheap optionality for buyers, thin premium for sellers.

Sizing MRK structures to the expected move

Iron condors with wings at ±1σ collect the modal-outcome premium; ±1.5σ widens probability of inside-range to ~87% but cuts collected premium roughly in half. Strangles do the inverse trade - they pay against the same lognormal distribution, profiting when realized exceeds implied. Calendar spreads bet on the slope of the term structure rather than the level. MRK put/call volume ratio currently at 0.31 indicates speculative call flow dominates - look for upside-skewed sentiment. The expected move is the inputs the chain is pricing, not a forecast - realized moves above or below are normal under any distribution.

Learn how expected move is reported and how to read the data →

Shaded band shows the ±1σ implied price range (~68% probability under lognormal assumptions) at each expiration; the center line marks current spot. Bands widen with longer DTE since volatility scales with √time.

Per-expiration expected move for MRK derived from ATM implied volatility at each listed expiration. Implied high/low bounds are computed as $135.44 × (1 ± expected move %). One standard-deviation range under lognormal assumptions, roughly 68% of outcomes fall inside.

Expiration	DTE	ATM IV	Expected Move	Implied High	Implied Low
Aug 21, 2026	7	23.9%	3.3%	$139.92	$130.96
Aug 28, 2026	14	24.8%	4.9%	$142.02	$128.86
Sep 4, 2026	21	25.0%	6.0%	$143.56	$127.32
Sep 11, 2026	28	24.3%	6.7%	$144.56	$126.32
Sep 18, 2026	35	25.7%	8.0%	$146.22	$124.66
Sep 25, 2026	42	26.4%	9.0%	$147.57	$123.31
Oct 2, 2026	49	25.5%	9.3%	$148.09	$122.79
Oct 16, 2026	63	26.3%	10.9%	$150.24	$120.64
Nov 20, 2026	98	28.0%	14.5%	$155.09	$115.79
Dec 18, 2026	126	28.8%	16.9%	$158.36	$112.52
Jan 15, 2027	154	28.8%	18.7%	$160.78	$110.10
Mar 19, 2027	217	29.0%	22.4%	$165.73	$105.15
Jun 17, 2027	307	29.6%	27.1%	$172.21	$98.67
Dec 17, 2027	490	30.2%	35.0%	$182.83	$88.05
Jan 21, 2028	525	29.9%	35.9%	$184.01	$86.87

Frequently asked MRK expected move questions

What is the current MRK expected move?: As of Aug 14, 2026, Merck & Co., Inc. (MRK) has an expected move of 7.10% over the next 28 days, implying a one-standard-deviation price range of $125.82 to $145.06 from the current $135.44. The expected move is derived from at-the-money straddle pricing and represents the market consensus for a ±1σ price move.
What does the MRK expected move mean for traders?: Roughly 68% of outcomes should fall within ±1 expected move and 95% within ±2 under lognormal assumptions, though equity returns have empirically fatter tails than log-normal predicts. Strategies sized to the expected move (iron condors at ±1σ, strangles at ±1.5σ) target the typical outcome distribution; strategies that profit from tail moves (long-vol structures, ratio backspreads) target the tails the lognormal model under-prices.
How is MRK expected move calculated?: The expected move displayed here is derived from at-the-money implied volatility scaled to the chosen tenor: expected move % is approximately ATM IV times sqrt(T / 365), where T is days to expiration. An equivalent straddle-based form: the ATM straddle (call + put at the same strike) is roughly sqrt(2/pi) times spot times IV times sqrt(T/365), so the implied one-standard-deviation move is approximately 1.25 times ATM straddle divided by spot. The two formulations agree once the sqrt(2/pi) constant is reconciled.