MKS INSTRS INC

Ticker: MKSI CUSIP: 55306N104 Class: EQTY

GROUP ONE TRADING, L.P.'s Holding History (CIK: 0000932540)

Note: Option positions (PUT/CALL) are excluded.

Q4 2025
Shares 6 Value ($000) $1 Avg Close $148.21 Range $120.73 - $170.37
Q1 2025
Shares 918 Value ($000) $74 Avg Close $100.21 Range $75.89 - $124.28
Q2 2024
Shares 433 Value ($000) $57 Avg Close $124.55 Range $105.72 - $137.52
Q1 2024
Shares 433 Value ($000) $58 Avg Close $114.51 Range $94.23 - $132.85
Q4 2023
Shares 108 Value ($000) $11 Avg Close $79.84 Range $62.28 - $104.49
Q3 2023
Shares 108 Value ($000) $9 Avg Close $95.58 Range $81.25 - $107.67
Q4 2019
Shares 274 Value ($000) $30 Avg Close $99.99 Range $81.07 - $109.78
Q3 2019
Shares 12 Value ($000) $1 Avg Close $78.64 Range $68.69 - $91.29
Q4 2018
Shares 416 Value ($000) $27 Avg Close $68.31 Range $53.35 - $77.61
Q1 2018
Shares 175 Value ($000) $20 Avg Close $103.13 Range $88.32 - $120.60
Q4 2017
Shares 51 Value ($000) $5 Avg Close $93.43 Range $82.69 - $103.63
Q2 2017
Shares 200 Value ($000) $13 Avg Close $70.74 Range $60.40 - $82.65