MKS INSTRS INC

Ticker: MKSI CUSIP: 55306N104 Class: EQTY

PUBLIC EMPLOYEES RETIREMENT SYSTEM OF OHIO's Holding History (CIK: 0001007280)

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

Q4 2025

Shares 55,319 Value ($000) $8,840 Avg Close $148.21 Range $120.73 - $170.37

Q3 2025

Shares 62,288 Value ($000) $7,709 Avg Close $106.31 Range $88.17 - $132.24

Q2 2025

Shares 71,083 Value ($000) $7,063 Avg Close $80.86 Range $54.50 - $100.44

Q1 2025

Shares 61,347 Value ($000) $4,917 Avg Close $100.21 Range $75.89 - $124.28

Q4 2024

Shares 39,464 Value ($000) $4,120 Avg Close $106.91 Range $96.54 - $118.37

Q3 2024

Shares 24,280 Value ($000) $2,639 Avg Close $117.45 Range $99.10 - $145.63

Q2 2024

Shares 25,490 Value ($000) $3,328 Avg Close $124.55 Range $105.72 - $137.52

Q1 2024

Shares 25,400 Value ($000) $3,378 Avg Close $114.51 Range $94.23 - $132.85

Q4 2023

Shares 27,794 Value ($000) $2,859 Avg Close $79.84 Range $62.28 - $104.49

Q3 2023

Shares 27,035 Value ($000) $2,340 Avg Close $95.58 Range $81.25 - $107.67

Q2 2023

Shares 30,029 Value ($000) $3,246 Avg Close $89.53 Range $77.81 - $108.20

Q1 2023

Shares 28,487 Value ($000) $2,525 Avg Close $93.12 Range $80.00 - $111.27

Q4 2022

Shares 29,371 Value ($000) $2,489 Avg Close $78.00 Range $62.97 - $89.22

Q3 2022

Shares 28,756 Value ($000) $2,376 Avg Close $100.01 Range $79.23 - $120.27

Q2 2022

Shares 27,634 Value ($000) $2,836 Avg Close $112.92 Range $94.75 - $148.07

Q1 2022

Shares 45,763 Value ($000) $6,864 Avg Close $150.35 Range $131.30 - $175.09

Q4 2021

Shares 46,199 Value ($000) $8,046 Avg Close $151.09 Range $136.06 - $172.80

Q3 2021

Shares 32,293 Value ($000) $4,873 Avg Close $148.13 Range $133.76 - $168.78

Q2 2021

Shares 33,261 Value ($000) $5,919 Avg Close $175.09 Range $158.98 - $192.11

Q1 2021

Shares 30,864 Value ($000) $5,723 Avg Close $161.78 Range $138.78 - $185.00

Q4 2020

Shares 28,175 Value ($000) $4,239 Avg Close $125.75 Range $101.82 - $152.08

Q3 2020

Shares 23,612 Value ($000) $2,579 Avg Close $112.47 Range $97.77 - $124.64

Q2 2020

Shares 44,729 Value ($000) $5,065 Avg Close $95.31 Range $70.45 - $112.06

Q1 2020

Shares 33,620 Value ($000) $2,738 Avg Close $97.84 Range $64.00 - $116.86

Q4 2019

Shares 68,126 Value ($000) $7,495 Avg Close $99.99 Range $81.07 - $109.78

Q3 2019

Shares 20,771 Value ($000) $1,917 Avg Close $78.64 Range $68.69 - $91.29

Q2 2019

Shares 20,491 Value ($000) $1,596 Avg Close $80.27 Range $67.03 - $98.53

Q1 2019

Shares 20,508 Value ($000) $1,908 Avg Close $76.40 Range $59.36 - $88.91

Q4 2018

Shares 38,509 Value ($000) $2,488 Avg Close $68.31 Range $53.35 - $77.61

Q3 2018

Shares 42,622 Value ($000) $3,416 Avg Close $86.11 Range $74.38 - $97.19

Q2 2018

Shares 132,574 Value ($000) $12,687 Avg Close $102.60 Range $86.55 - $115.42

Q1 2018

Shares 45,991 Value ($000) $5,319 Avg Close $103.13 Range $88.32 - $120.60

Q4 2017

Shares 48,760 Value ($000) $4,608 Avg Close $93.43 Range $82.69 - $103.63

Q3 2017

Shares 30,960 Value ($000) $2,924 Avg Close $76.52 Range $62.45 - $89.48

Q2 2017

Shares 2,273 Value ($000) $153 Avg Close $70.74 Range $60.40 - $82.65

Q1 2017

Shares 2,487 Value ($000) $171 Avg Close $61.31 Range $54.85 - $65.67

Q4 2016

Shares 2,679 Value ($000) $183 Avg Close $50.13 Range $43.15 - $57.04

Q3 2016

Shares 2,743 Value ($000) $136 Avg Close $43.66 Range $38.22 - $50.60

Q2 2016

Shares 2,843 Value ($000) $122 Avg Close $35.80 Range $32.24 - $39.81

Q1 2016

Shares 2,624 Value ($000) $99 Avg Close $31.35 Range $28.08 - $35.11

Q4 2015

Shares 2,854 Value ($000) $103 Avg Close $32.52 Range $26.43 - $35.02

Q3 2015

Shares 51,263 Value ($000) $1,719 Avg Close $31.60 Range $28.82 - $34.92

Q2 2015

Shares 51,432 Value ($000) $1,951 Avg Close $32.93 Range $29.54 - $35.95

Q1 2015

Shares 4,118 Value ($000) $139 Avg Close $31.63 Range $29.59 - $33.22

Q4 2014

Shares 4,272 Value ($000) $156 Avg Close $31.69 Range $27.30 - $33.99

Q3 2014

Shares 4,529 Value ($000) $151 Avg Close $29.19 Range $27.47 - $31.20

Q2 2014

Shares 6,442 Value ($000) $201 Avg Close $25.69 Range $23.72 - $27.88

Q1 2014

Shares 6,006 Value ($000) $180 Avg Close $26.46 Range $25.10 - $28.61

Q4 2013

Shares 7,308 Value ($000) $219 Avg Close $25.51 Range $23.10 - $27.14

Q3 2013

Shares 3,621 Value ($000) $96 Avg Close $23.28 Range $21.63 - $25.20

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	55,319	$8,840	$148.21	$120.73 - $170.37
Q3 2025	62,288	$7,709	$106.31	$88.17 - $132.24
Q2 2025	71,083	$7,063	$80.86	$54.50 - $100.44
Q1 2025	61,347	$4,917	$100.21	$75.89 - $124.28
Q4 2024	39,464	$4,120	$106.91	$96.54 - $118.37
Q3 2024	24,280	$2,639	$117.45	$99.10 - $145.63
Q2 2024	25,490	$3,328	$124.55	$105.72 - $137.52
Q1 2024	25,400	$3,378	$114.51	$94.23 - $132.85
Q4 2023	27,794	$2,859	$79.84	$62.28 - $104.49
Q3 2023	27,035	$2,340	$95.58	$81.25 - $107.67
Q2 2023	30,029	$3,246	$89.53	$77.81 - $108.20
Q1 2023	28,487	$2,525	$93.12	$80.00 - $111.27
Q4 2022	29,371	$2,489	$78.00	$62.97 - $89.22
Q3 2022	28,756	$2,376	$100.01	$79.23 - $120.27
Q2 2022	27,634	$2,836	$112.92	$94.75 - $148.07
Q1 2022	45,763	$6,864	$150.35	$131.30 - $175.09
Q4 2021	46,199	$8,046	$151.09	$136.06 - $172.80
Q3 2021	32,293	$4,873	$148.13	$133.76 - $168.78
Q2 2021	33,261	$5,919	$175.09	$158.98 - $192.11
Q1 2021	30,864	$5,723	$161.78	$138.78 - $185.00
Q4 2020	28,175	$4,239	$125.75	$101.82 - $152.08
Q3 2020	23,612	$2,579	$112.47	$97.77 - $124.64
Q2 2020	44,729	$5,065	$95.31	$70.45 - $112.06
Q1 2020	33,620	$2,738	$97.84	$64.00 - $116.86
Q4 2019	68,126	$7,495	$99.99	$81.07 - $109.78
Q3 2019	20,771	$1,917	$78.64	$68.69 - $91.29
Q2 2019	20,491	$1,596	$80.27	$67.03 - $98.53
Q1 2019	20,508	$1,908	$76.40	$59.36 - $88.91
Q4 2018	38,509	$2,488	$68.31	$53.35 - $77.61
Q3 2018	42,622	$3,416	$86.11	$74.38 - $97.19
Q2 2018	132,574	$12,687	$102.60	$86.55 - $115.42
Q1 2018	45,991	$5,319	$103.13	$88.32 - $120.60
Q4 2017	48,760	$4,608	$93.43	$82.69 - $103.63
Q3 2017	30,960	$2,924	$76.52	$62.45 - $89.48
Q2 2017	2,273	$153	$70.74	$60.40 - $82.65
Q1 2017	2,487	$171	$61.31	$54.85 - $65.67
Q4 2016	2,679	$183	$50.13	$43.15 - $57.04
Q3 2016	2,743	$136	$43.66	$38.22 - $50.60
Q2 2016	2,843	$122	$35.80	$32.24 - $39.81
Q1 2016	2,624	$99	$31.35	$28.08 - $35.11
Q4 2015	2,854	$103	$32.52	$26.43 - $35.02
Q3 2015	51,263	$1,719	$31.60	$28.82 - $34.92
Q2 2015	51,432	$1,951	$32.93	$29.54 - $35.95
Q1 2015	4,118	$139	$31.63	$29.59 - $33.22
Q4 2014	4,272	$156	$31.69	$27.30 - $33.99
Q3 2014	4,529	$151	$29.19	$27.47 - $31.20
Q2 2014	6,442	$201	$25.69	$23.72 - $27.88
Q1 2014	6,006	$180	$26.46	$25.10 - $28.61
Q4 2013	7,308	$219	$25.51	$23.10 - $27.14
Q3 2013	3,621	$96	$23.28	$21.63 - $25.20