147.41 USD
↗ 0.23 (0.16%)AFTER HOURS (AS OF Wed 03:00 PM EST)
MRK Stock After Hours
Merck & Co., Inc.
MRKNYSE • USD
Market: OPEN
After-hours trading runs 4:00 PM – 8:00 PM ET.
MRK last traded at $147.41 after hours, up $0.23 (0.16%) from its regular-session close of $147.18.
📅 MRK is expected to report earnings around Feb 2, 2027 before the open (estimated), with an estimated EPS of $1.78. MRK earnings details →
MRK After Hours Chart
MRK After Hours News
Gap Analytics — 5-year history, 5% minimum gap
Over the past 5 years, MRK has had 4 qualifying gap events (gaps of 5% or more at the open) — 2 gap-ups and 2 gap-downs. Gap-ups averaged +7.3%, 50% have fully filled, median time to fill 9 trading days. Gap-downs averaged -7.9%, 50% have fully filled, median time to fill 14 trading days. Most recent: a +8.7% gap up on Aug 19, 2026, still unfilled. Average 20-trading-day return after a MRK gap up: -0.74%. After a gap down: +5.58%.
Gap Ups2 events
Fill Rate
50.0%
Avg Gap
7.3%
Avg 50% Fill
19.5d
Avg Fill
9d
Gap Downs2 events
Fill Rate
50.0%
Avg Gap
7.9%
Avg 50% Fill
10.5d
Avg Fill
14d
Avg Gap Fill by Timeframes
Gap Ups
| 1 day | 1 week | 2 week | 4 week | |
|---|---|---|---|---|
| fills 25% | 50% | 50% | 50% | 100% |
| fills 50% | 0% | 50% | 50% | 50% |
| fills 75% | 0% | 50% | 50% | 50% |
| fills 100% | 0% | 0% | 50% | 50% |
Gap Downs
| 1 day | 1 week | 2 week | 4 week | |
|---|---|---|---|---|
| fills 25% | 50% | 50% | 50% | 100% |
| fills 50% | 50% | 50% | 50% | 100% |
| fills 75% | 0% | 50% | 50% | 50% |
| fills 100% | 0% | 0% | 0% | 50% |
Complete Gap History — 4 events
| Date | Gap From | Gap % | Status | Days to 50% | Days to Fill | % of Gap Filled After | |||
|---|---|---|---|---|---|---|---|---|---|
| 1 day | 1 week | 2 week | 4 week | ||||||
| 2026-08-19 | $135.17 | +8.71% | Open | 33d | — | 17% | 17% | 17% | 39% |
| 2025-07-29 | $84.06 | -5.01% | Filled | 1d | 14d | 72% | 89% | 89% | 100% |
| 2025-02-04 | $99.79 | -10.81% | Open | 20d | — | 21% | 21% | 21% | 59% |
| 2024-03-27 | $125.52 | +5.86% | Filled | 6d | 9d | 38% | 75% | 100% | 100% |
Frequently Asked Questions
What is MRK's after-hours price?
Merck & (MRK) is trading at $147.41 after hours, up $0.23 (0.16%) from its regular-session close of $147.18.
Why is MRK moving after hours?
MRK is up 0.16% in after-hours trading. Moves in this session almost always follow something released after the 4:00 PM ET close — an earnings report, guidance, a filing, or news — and trade on far thinner volume than the regular session, so the size of the move can overstate what the market will settle on at the next open.
When does MRK after-hours trading start and end?
After-hours trading in MRK on the NYSE runs from 4:00 PM to 8:00 PM ET on trading days, immediately after the regular session closes. Not every broker offers the full window, and liquidity thins sharply after about 6:30 PM ET.
Will MRK's after-hours move hold at the open?
An after-hours move that carries into the next session becomes an opening gap, and MRK's gap history is the best guide to what happens next: 50% of MRK gap-ups have fully filled, and 50% of gap-downs have filled over the past 5 years. Fill rates this high mean a large after-hours move is more often faded than extended.
When does MRK report earnings?
MRK is expected to report earnings around Feb 2, 2027 before the open (estimated), with an estimated EPS of $1.78. Earnings are the most common cause of a large after-hours move, since most companies report after the close.