266.51 USD
↘ 0.80 (0.30%)AFTER HOURS (AS OF Fri 07:37 PM EDT)
MKSI Stock After Hours
MKS Inc. Common Stock
MKSINASDAQ • USD
Market: CLOSED
After-hours trading runs 4:00 PM – 8:00 PM ET.
MKSI last traded at $266.51 after hours, down $0.80 (0.30%) from its regular-session close of $267.31.
📅 MKSI is expected to report earnings around Nov 4, 2026 after the close (estimated), with an estimated EPS of $3.59. MKSI earnings details →
MKSI After Hours Chart
MKSI After Hours News
Gap Analytics — 5-year history, 5% minimum gap
Over the past 5 years, MKSI has had 38 qualifying gap events (gaps of 5% or more at the open) — 22 gap-ups and 16 gap-downs. Gap-ups averaged +7.2%, 68% have fully filled, median time to fill 3 trading days. Gap-downs averaged -6%, 88% have fully filled, median time to fill 4 trading days. Most recent: a -5.3% gap down on Aug 18, 2026, still unfilled. MKSI has 1 unfilled gap from the past 60 days — a -5.3% gap down on Aug 18, 2026, currently 31% retraced. Average 20-trading-day return after a MKSI gap up: +0.36%. After a gap down: +3.51%.
Gap Ups22 events
Fill Rate
68.2%
Avg Gap
7.2%
Avg 50% Fill
1d
Avg Fill
3d
Gap Downs16 events
Fill Rate
87.5%
Avg Gap
6.0%
Avg 50% Fill
2d
Avg Fill
4d
Avg Gap Fill by Timeframes
Gap Ups
| 1 day | 1 week | 2 week | 4 week | |
|---|---|---|---|---|
| fills 25% | 59% | 77% | 82% | 86% |
| fills 50% | 41% | 59% | 68% | 73% |
| fills 75% | 27% | 59% | 68% | 73% |
| fills 100% | 5% | 50% | 59% | 59% |
Gap Downs
| 1 day | 1 week | 2 week | 4 week | |
|---|---|---|---|---|
| fills 25% | 69% | 88% | 94% | 94% |
| fills 50% | 44% | 75% | 88% | 88% |
| fills 75% | 38% | 75% | 88% | 88% |
| fills 100% | 19% | 69% | 81% | 81% |
Active Unfilled Gaps (past 60 days)
26 days ago
2026-08-18
Gap %
-5.26%
Gap From
$320.74
% vs Current
+19.99%
retraced 31% to $309.15
Complete Gap History — 38 events
| Date | Gap From | Gap % | Status | Days to 50% | Days to Fill | % of Gap Filled After | |||
|---|---|---|---|---|---|---|---|---|---|
| 1 day | 1 week | 2 week | 4 week | ||||||
| 26 days ago | $320.74 | -5.26% | Open | — | — | 31% | 31% | 31% | 31% |
| 2026-08-12 | $294.38 | +6.29% | Filled | 3d | 6d | 40% | 100% | 100% | 100% |
| 2026-08-06 | $313.10 | -7.05% | Filled | 1d | 5d | 84% | 100% | 100% | 100% |
| 2026-08-04 | $309.98 | +5.58% | Filled | 2d | 3d | 39% | 100% | 100% | 100% |
| 2026-07-31 | $293.30 | +5.69% | Filled | 1d | 2d | 95% | 100% | 100% | 100% |
| 2026-07-30 | $257.61 | +12.11% | Filled | 18d | 22d | 13% | 13% | 13% | 78% |
| 2026-07-28 | $315.70 | -6.14% | Filled | 4d | 6d | 3% | 100% | 100% | 100% |
| 2026-07-21 | $324.28 | +7.09% | Filled | 1d | 5d | 59% | 100% | 100% | 100% |
| 2026-07-17 | $332.00 | -5.11% | Filled | 1d | 2d | 92% | 100% | 100% | 100% |
| 2026-07-14 | $352.03 | +6.02% | Filled | 1d | 2d | 94% | 100% | 100% | 100% |
| 2026-07-09 | $349.39 | +5.94% | Filled | 2d | 3d | 19% | 100% | 100% | 100% |
| 2026-07-07 | $368.06 | -6.85% | Filled | 2d | 3d | 40% | 100% | 100% | 100% |
| 2026-06-25 | $381.62 | +6.91% | Filled | 1d | 6d | 93% | 100% | 100% | 100% |
| 2026-06-23 | $420.56 | -7.58% | Filled | 3d | 6d | 18% | 100% | 100% | 100% |
| 2026-05-08 | $300.79 | +5.95% | Filled | 1d | 3d | 55% | 100% | 100% | 100% |
| 2026-05-07 | $293.77 | +7.63% | Filled | 1d | 8d | 91% | 91% | 100% | 100% |
| 2026-04-08 | $238.17 | +7.90% | Open | — | — | 37% | 37% | 37% | 37% |
| 2026-04-02 | $235.96 | -5.74% | Filled | 1d | 1d | 100% | 100% | 100% | 100% |
| 2026-02-18 | $262.94 | -7.44% | Filled | 1d | 3d | 90% | 100% | 100% | 100% |
| 2026-01-15 | $190.30 | +7.72% | Open | — | — | 18% | 34% | 34% | 34% |
| 2025-11-06 | $139.92 | +5.22% | Filled | 6d | 7d | 10% | 85% | 100% | 100% |
| 2025-10-13 | $121.26 | +6.75% | Open | — | — | 21% | 31% | 31% | 31% |
| 2025-08-07 | $89.62 | +8.40% | Open | — | — | 21% | 21% | 21% | 21% |
| 2025-05-12 | $80.05 | +9.01% | Open | 10d | — | 6% | 6% | 79% | 98% |
| 2025-04-23 | $62.86 | +8.00% | Open | — | — | 11% | 11% | 11% | 11% |
| 2025-04-10 | $73.20 | -5.61% | Filled | 9d | 10d | 1% | 10% | 100% | 100% |
| 2025-04-08 | $62.99 | +5.37% | Filled | 1d | 1d | 100% | 100% | 100% | 100% |
| 2025-04-07 | $60.29 | -5.14% | Filled | 1d | 1d | 100% | 100% | 100% | 100% |
| 2025-04-04 | $64.27 | -5.72% | Filled | 1d | 2d | 55% | 100% | 100% | 100% |
| 2025-04-03 | $81.28 | -5.68% | Filled | 25d | 27d | 12% | 12% | 12% | 14% |
| 2025-02-13 | $111.20 | -5.49% | Open | 5d | — | 43% | 88% | 88% | 88% |
| 2024-11-07 | $103.29 | +14.00% | Filled | 7d | 30d | 32% | 47% | 89% | 89% |
| 2024-08-05 | $106.56 | -5.55% | Filled | 1d | 1d | 100% | 100% | 100% | 100% |
| 2024-05-09 | $123.38 | +5.16% | Filled | 1d | 3d | 96% | 100% | 100% | 100% |
| 2023-12-15 | $99.14 | -5.20% | Filled | 3d | 5d | 47% | 100% | 100% | 100% |
| 2022-12-13 | $84.26 | +5.34% | Filled | 1d | 3d | 67% | 100% | 100% | 100% |
| 2022-11-10 | $65.09 | +6.08% | Open | — | — | 9% | 9% | 9% | 9% |
| 2022-11-03 | $79.96 | -6.34% | Filled | 7d | 7d | 5% | 47% | 100% | 100% |
Frequently Asked Questions
What is MKSI's after-hours price?
MKS (MKSI) is trading at $266.51 after hours, down $0.80 (0.30%) from its regular-session close of $267.31.
Why is MKSI moving after hours?
MKSI is down 0.30% 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 MKSI after-hours trading start and end?
After-hours trading in MKSI on the NASDAQ 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 MKSI's after-hours move hold at the open?
An after-hours move that carries into the next session becomes an opening gap, and MKSI's gap history is the best guide to what happens next: 68% of MKSI gap-ups have fully filled, and 88% 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 MKSI report earnings?
MKSI is expected to report earnings around Nov 4, 2026 after the close (estimated), with an estimated EPS of $3.59. Earnings are the most common cause of a large after-hours move, since most companies report after the close.