• Oct 23, 2026

  $196.55+0.22%

• Oct 22, 2026

  $196.11-9.25%

  Shares fell 9.25% while comparable industrial instruments companies moved -1.23% on average, with 4 of 6 falling and 2 rising [1]. The decline was therefore much larger than the peer group's move and was not shared to that degree. Volume was 2.1x the trailing 20-session average, and the session traded in a range of 6.2% of the low [2].

  • 1Peer group
  • 2Market data

• Oct 21, 2026

  $216.10+2.35%

  MKSI rose 2.35% as comparable industrial instruments companies moved +1.32% on average, with 5 of 6 rising [1]. The gain came alongside a broadly positive group move [1].

  • 1Peer group

• Oct 20, 2026

  $211.14-1.98%

  Comparable listed companies in industrial instruments for measurement, display and control rose 1.78% on average, with 5 of 6 advancing [1]. MKSI fell 1.98%, so its decline was not shared by the sector [1].

  • 1Peer group

• Oct 19, 2026

  $215.41+0.27%

  Globenewswire published a headline stating that MKS Inc. would sell its Ophir Optics business to TTM Technologies, Inc. [1]. The shares closed up 0.27%.

  • 1Globenewswire

• Oct 16, 2026

  $214.83-5.99%

  Comparable listed companies in industrial instruments for measurement, display and control fell 1.34% on average, with 4 of 6 lower [1]. MKSI's 5.99% decline was far larger than the cohort's average move, so it was not shared to that degree [1].

  • 1Peer group

• Oct 15, 2026

  $228.52-2.55%

  MKSI fell 2.55% while comparable industrial instruments companies were roughly flat, moving +0.02% on average, with four of six rising [1]. The move was therefore not shared by the group. Volume was 2.1x the trailing 20-session average, and the session ranged from 212.35 to 230.57 [2].

  • 1Peer group
  • 2Market data

Closing prices for MKSI. Summaries describe past sessions only and are not advice, a forecast or a recommendation.

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