MKS INSTRS INC

Ticker: MKSI CUSIP: 55306N104 Class: EQTY

TEACHERS RETIREMENT SYSTEM OF THE STATE OF KENTUCKY's Holding History (CIK: 0000714142)

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

Q4 2025

Shares 37,904 Value ($000) $6 Avg Close $148.21 Range $120.73 - $170.37

Q3 2025

Shares 38,963 Value ($000) $5 Avg Close $106.31 Range $88.17 - $132.24

Q2 2025

Shares 38,245 Value ($000) $4 Avg Close $80.86 Range $54.50 - $100.44

Q1 2025

Shares 40,833 Value ($000) $3 Avg Close $100.21 Range $75.89 - $124.28

Q4 2024

Shares 33,541 Value ($000) $4 Avg Close $106.91 Range $96.54 - $118.37

Q3 2024

Shares 34,581 Value ($000) $4 Avg Close $117.45 Range $99.10 - $145.63

Q2 2024

Shares 32,231 Value ($000) $4 Avg Close $124.55 Range $105.72 - $137.52

Q1 2024

Shares 28,068 Value ($000) $4 Avg Close $114.51 Range $94.23 - $132.85

Q4 2023

Shares 28,711 Value ($000) $3 Avg Close $79.84 Range $62.28 - $104.49

Q3 2023

Shares 94,235 Value ($000) $8 Avg Close $95.58 Range $81.25 - $107.67

Q2 2023

Shares 131,980 Value ($000) $14 Avg Close $89.53 Range $77.81 - $108.20

Q1 2023

Shares 63,891 Value ($000) $6 Avg Close $93.12 Range $80.00 - $111.27

Q4 2022

Shares 22,001 Value ($000) $2 Avg Close $78.00 Range $62.97 - $89.22

Q3 2022

Shares 49,770 Value ($000) $4,113 Avg Close $100.01 Range $79.23 - $120.27

Q1 2022

Shares 60,155 Value ($000) $9,024 Avg Close $150.35 Range $131.30 - $175.09

Q4 2021

Shares 60,050 Value ($000) $10,459 Avg Close $151.09 Range $136.06 - $172.80

Q3 2021

Shares 59,328 Value ($000) $8,953 Avg Close $148.13 Range $133.76 - $168.78

Q2 2021

Shares 58,158 Value ($000) $10,349 Avg Close $175.09 Range $158.98 - $192.11

Q1 2021

Shares 62,695 Value ($000) $11,625 Avg Close $161.78 Range $138.78 - $185.00

Q4 2020

Shares 64,879 Value ($000) $9,761 Avg Close $125.75 Range $101.82 - $152.08

Q3 2020

Shares 64,079 Value ($000) $7,000 Avg Close $112.47 Range $97.77 - $124.64

Q2 2020

Shares 65,699 Value ($000) $7,440 Avg Close $95.31 Range $70.45 - $112.06

Q1 2020

Shares 60,905 Value ($000) $4,960 Avg Close $97.84 Range $64.00 - $116.86

Q4 2019

Shares 52,422 Value ($000) $5,767 Avg Close $99.99 Range $81.07 - $109.78

Q3 2019

Shares 52,770 Value ($000) $4,869 Avg Close $78.64 Range $68.69 - $91.29

Q2 2019

Shares 47,888 Value ($000) $3,730 Avg Close $80.27 Range $67.03 - $98.53

Q1 2019

Shares 48,888 Value ($000) $4,549 Avg Close $76.40 Range $59.36 - $88.91

Q4 2018

Shares 48,888 Value ($000) $3,159 Avg Close $68.31 Range $53.35 - $77.61

Q3 2018

Shares 46,713 Value ($000) $3,744 Avg Close $86.11 Range $74.38 - $97.19

Q2 2018

Shares 60,119 Value ($000) $5,753 Avg Close $102.60 Range $86.55 - $115.42

Q1 2018

Shares 60,219 Value ($000) $6,965 Avg Close $103.13 Range $88.32 - $120.60

Q4 2017

Shares 71,839 Value ($000) $6,788 Avg Close $93.43 Range $82.69 - $103.63

Q3 2017

Shares 84,417 Value ($000) $7,973 Avg Close $76.52 Range $62.45 - $89.48

Q2 2017

Shares 95,242 Value ($000) $6,410 Avg Close $70.74 Range $60.40 - $82.65

Q1 2017

Shares 96,101 Value ($000) $6,607 Avg Close $61.31 Range $54.85 - $65.67

Q4 2016

Shares 92,390 Value ($000) $5,489 Avg Close $50.13 Range $43.15 - $57.04

Q3 2016

Shares 80,882 Value ($000) $4,023 Avg Close $43.66 Range $38.22 - $50.60

Q2 2016

Shares 51,294 Value ($000) $2,209 Avg Close $35.80 Range $32.24 - $39.81

Q1 2016

Shares 52,094 Value ($000) $1,961 Avg Close $31.35 Range $28.08 - $35.11

Q4 2015

Shares 52,094 Value ($000) $1,876 Avg Close $32.52 Range $26.43 - $35.02

Q3 2015

Shares 52,094 Value ($000) $1,747 Avg Close $31.60 Range $28.82 - $34.92

Q2 2015

Shares 44,890 Value ($000) $1,703 Avg Close $32.93 Range $29.54 - $35.95

Q1 2015

Shares 22,100 Value ($000) $747 Avg Close $31.63 Range $29.59 - $33.22

Q4 2014

Shares 18,900 Value ($000) $692 Avg Close $31.69 Range $27.30 - $33.99

Q3 2014

Shares 18,900 Value ($000) $631 Avg Close $29.19 Range $27.47 - $31.20

Q2 2014

Shares 18,900 Value ($000) $590 Avg Close $25.69 Range $23.72 - $27.88

Q1 2014

Shares 20,100 Value ($000) $601 Avg Close $26.46 Range $25.10 - $28.61

Q4 2013

Shares 20,100 Value ($000) $601 Avg Close $25.51 Range $23.10 - $27.14

Q3 2013

Shares 19,100 Value ($000) $508 Avg Close $23.28 Range $21.63 - $25.20

Q2 2013

Shares 21,600 Value ($000) $573 Avg Close $23.45 Range $21.31 - $25.25

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	37,904	$6	$148.21	$120.73 - $170.37
Q3 2025	38,963	$5	$106.31	$88.17 - $132.24
Q2 2025	38,245	$4	$80.86	$54.50 - $100.44
Q1 2025	40,833	$3	$100.21	$75.89 - $124.28
Q4 2024	33,541	$4	$106.91	$96.54 - $118.37
Q3 2024	34,581	$4	$117.45	$99.10 - $145.63
Q2 2024	32,231	$4	$124.55	$105.72 - $137.52
Q1 2024	28,068	$4	$114.51	$94.23 - $132.85
Q4 2023	28,711	$3	$79.84	$62.28 - $104.49
Q3 2023	94,235	$8	$95.58	$81.25 - $107.67
Q2 2023	131,980	$14	$89.53	$77.81 - $108.20
Q1 2023	63,891	$6	$93.12	$80.00 - $111.27
Q4 2022	22,001	$2	$78.00	$62.97 - $89.22
Q3 2022	49,770	$4,113	$100.01	$79.23 - $120.27
Q1 2022	60,155	$9,024	$150.35	$131.30 - $175.09
Q4 2021	60,050	$10,459	$151.09	$136.06 - $172.80
Q3 2021	59,328	$8,953	$148.13	$133.76 - $168.78
Q2 2021	58,158	$10,349	$175.09	$158.98 - $192.11
Q1 2021	62,695	$11,625	$161.78	$138.78 - $185.00
Q4 2020	64,879	$9,761	$125.75	$101.82 - $152.08
Q3 2020	64,079	$7,000	$112.47	$97.77 - $124.64
Q2 2020	65,699	$7,440	$95.31	$70.45 - $112.06
Q1 2020	60,905	$4,960	$97.84	$64.00 - $116.86
Q4 2019	52,422	$5,767	$99.99	$81.07 - $109.78
Q3 2019	52,770	$4,869	$78.64	$68.69 - $91.29
Q2 2019	47,888	$3,730	$80.27	$67.03 - $98.53
Q1 2019	48,888	$4,549	$76.40	$59.36 - $88.91
Q4 2018	48,888	$3,159	$68.31	$53.35 - $77.61
Q3 2018	46,713	$3,744	$86.11	$74.38 - $97.19
Q2 2018	60,119	$5,753	$102.60	$86.55 - $115.42
Q1 2018	60,219	$6,965	$103.13	$88.32 - $120.60
Q4 2017	71,839	$6,788	$93.43	$82.69 - $103.63
Q3 2017	84,417	$7,973	$76.52	$62.45 - $89.48
Q2 2017	95,242	$6,410	$70.74	$60.40 - $82.65
Q1 2017	96,101	$6,607	$61.31	$54.85 - $65.67
Q4 2016	92,390	$5,489	$50.13	$43.15 - $57.04
Q3 2016	80,882	$4,023	$43.66	$38.22 - $50.60
Q2 2016	51,294	$2,209	$35.80	$32.24 - $39.81
Q1 2016	52,094	$1,961	$31.35	$28.08 - $35.11
Q4 2015	52,094	$1,876	$32.52	$26.43 - $35.02
Q3 2015	52,094	$1,747	$31.60	$28.82 - $34.92
Q2 2015	44,890	$1,703	$32.93	$29.54 - $35.95
Q1 2015	22,100	$747	$31.63	$29.59 - $33.22
Q4 2014	18,900	$692	$31.69	$27.30 - $33.99
Q3 2014	18,900	$631	$29.19	$27.47 - $31.20
Q2 2014	18,900	$590	$25.69	$23.72 - $27.88
Q1 2014	20,100	$601	$26.46	$25.10 - $28.61
Q4 2013	20,100	$601	$25.51	$23.10 - $27.14
Q3 2013	19,100	$508	$23.28	$21.63 - $25.20
Q2 2013	21,600	$573	$23.45	$21.31 - $25.25