MKS INSTRS INC

Ticker: MKSI CUSIP: 55306N104 Class: EQTY

Leith Wheeler Investment Counsel Ltd.'s Holding History (CIK: 0001353651)

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

Q4 2025

Shares 48,469 Value ($000) $7,745 Avg Close $148.21 Range $120.73 - $170.37

Q3 2025

Shares 67,164 Value ($000) $8,313 Avg Close $106.31 Range $88.17 - $132.24

Q2 2025

Shares 71,288 Value ($000) $7,083 Avg Close $80.86 Range $54.50 - $100.44

Q1 2025

Shares 73,174 Value ($000) $5,865 Avg Close $100.21 Range $75.89 - $124.28

Q4 2024

Shares 72,283 Value ($000) $7,546 Avg Close $106.91 Range $96.54 - $118.37

Q3 2024

Shares 74,846 Value ($000) $8,137 Avg Close $117.45 Range $99.10 - $145.63

Q2 2024

Shares 77,836 Value ($000) $10,164 Avg Close $124.55 Range $105.72 - $137.52

Q1 2024

Shares 77,266 Value ($000) $10,276 Avg Close $114.51 Range $94.23 - $132.85

Q4 2023

Shares 77,176 Value ($000) $7,939 Avg Close $79.84 Range $62.28 - $104.49

Q3 2023

Shares 78,176 Value ($000) $6,765 Avg Close $95.58 Range $81.25 - $107.67

Q2 2023

Shares 77,246 Value ($000) $8,350 Avg Close $89.53 Range $77.81 - $108.20

Q1 2023

Shares 72,511 Value ($000) $6,426 Avg Close $93.12 Range $80.00 - $111.27

Q4 2022

Shares 72,031 Value ($000) $6 Avg Close $78.00 Range $62.97 - $89.22

Q3 2022

Shares 55,231 Value ($000) $4,564 Avg Close $100.01 Range $79.23 - $120.27

Q2 2022

Shares 44,561 Value ($000) $5,888 Avg Close $112.92 Range $94.75 - $148.07

Q1 2022

Shares 39,976 Value ($000) $5,996 Avg Close $150.35 Range $131.30 - $175.09

Q4 2021

Shares 47,619 Value ($000) $8,294 Avg Close $151.09 Range $136.06 - $172.80

Q3 2021

Shares 47,129 Value ($000) $7,112 Avg Close $148.13 Range $133.76 - $168.78

Q2 2021

Shares 46,569 Value ($000) $8,287 Avg Close $175.09 Range $158.98 - $192.11

Q1 2021

Shares 44,149 Value ($000) $8,186 Avg Close $161.78 Range $138.78 - $185.00

Q4 2020

Shares 61,279 Value ($000) $11,739 Avg Close $125.75 Range $101.82 - $152.08

Q3 2020

Shares 60,084 Value ($000) $6,563 Avg Close $112.47 Range $97.77 - $124.64

Q2 2020

Shares 59,274 Value ($000) $6,712 Avg Close $95.31 Range $70.45 - $112.06

Q1 2020

Shares 53,853 Value ($000) $4,386 Avg Close $97.84 Range $64.00 - $116.86

Q4 2019

Shares 12,910 Value ($000) $1,420 Avg Close $99.99 Range $81.07 - $109.78

Q3 2019

Shares 16,190 Value ($000) $1,494 Avg Close $78.64 Range $68.69 - $91.29

Q2 2019

Shares 12,000 Value ($000) $935 Avg Close $80.27 Range $67.03 - $98.53

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	48,469	$7,745	$148.21	$120.73 - $170.37
Q3 2025	67,164	$8,313	$106.31	$88.17 - $132.24
Q2 2025	71,288	$7,083	$80.86	$54.50 - $100.44
Q1 2025	73,174	$5,865	$100.21	$75.89 - $124.28
Q4 2024	72,283	$7,546	$106.91	$96.54 - $118.37
Q3 2024	74,846	$8,137	$117.45	$99.10 - $145.63
Q2 2024	77,836	$10,164	$124.55	$105.72 - $137.52
Q1 2024	77,266	$10,276	$114.51	$94.23 - $132.85
Q4 2023	77,176	$7,939	$79.84	$62.28 - $104.49
Q3 2023	78,176	$6,765	$95.58	$81.25 - $107.67
Q2 2023	77,246	$8,350	$89.53	$77.81 - $108.20
Q1 2023	72,511	$6,426	$93.12	$80.00 - $111.27
Q4 2022	72,031	$6	$78.00	$62.97 - $89.22
Q3 2022	55,231	$4,564	$100.01	$79.23 - $120.27
Q2 2022	44,561	$5,888	$112.92	$94.75 - $148.07
Q1 2022	39,976	$5,996	$150.35	$131.30 - $175.09
Q4 2021	47,619	$8,294	$151.09	$136.06 - $172.80
Q3 2021	47,129	$7,112	$148.13	$133.76 - $168.78
Q2 2021	46,569	$8,287	$175.09	$158.98 - $192.11
Q1 2021	44,149	$8,186	$161.78	$138.78 - $185.00
Q4 2020	61,279	$11,739	$125.75	$101.82 - $152.08
Q3 2020	60,084	$6,563	$112.47	$97.77 - $124.64
Q2 2020	59,274	$6,712	$95.31	$70.45 - $112.06
Q1 2020	53,853	$4,386	$97.84	$64.00 - $116.86
Q4 2019	12,910	$1,420	$99.99	$81.07 - $109.78
Q3 2019	16,190	$1,494	$78.64	$68.69 - $91.29
Q2 2019	12,000	$935	$80.27	$67.03 - $98.53