MKS INSTRS INC

Ticker: MKSI CUSIP: 55306N104 Class: EQTY

NEEDHAM INVESTMENT MANAGEMENT LLC's Holding History (CIK: 0001167212)

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

Q4 2025

Shares 130,500 Value ($000) $20,854 Avg Close $148.21 Range $120.73 - $170.37

Q3 2025

Shares 130,750 Value ($000) $16,183 Avg Close $106.31 Range $88.17 - $132.24

Q2 2025

Shares 128,750 Value ($000) $12,793 Avg Close $80.86 Range $54.50 - $100.44

Q1 2025

Shares 128,750 Value ($000) $10,319 Avg Close $100.21 Range $75.89 - $124.28

Q4 2024

Shares 129,000 Value ($000) $13,466 Avg Close $106.91 Range $96.54 - $118.37

Q3 2024

Shares 124,500 Value ($000) $13,534 Avg Close $117.45 Range $99.10 - $145.63

Q2 2024

Shares 123,000 Value ($000) $16,061 Avg Close $124.55 Range $105.72 - $137.52

Q1 2024

Shares 173,000 Value ($000) $23,009 Avg Close $114.51 Range $94.23 - $132.85

Q4 2023

Shares 187,000 Value ($000) $19,237 Avg Close $79.84 Range $62.28 - $104.49

Q3 2023

Shares 157,000 Value ($000) $13,587 Avg Close $95.58 Range $81.25 - $107.67

Q2 2023

Shares 121,000 Value ($000) $13,080 Avg Close $89.53 Range $77.81 - $108.20

Q1 2023

Shares 121,500 Value ($000) $10,767 Avg Close $93.12 Range $80.00 - $111.27

Q4 2022

Shares 139,500 Value ($000) $11,820 Avg Close $78.00 Range $62.97 - $89.22

Q3 2022

Shares 115,500 Value ($000) $9,545 Avg Close $100.01 Range $79.23 - $120.27

Q2 2022

Shares 153,000 Value ($000) $15,702 Avg Close $112.92 Range $94.75 - $148.07

Q1 2022

Shares 137,000 Value ($000) $20,550 Avg Close $150.35 Range $131.30 - $175.09

Q4 2021

Shares 137,000 Value ($000) $23,862 Avg Close $151.09 Range $136.06 - $172.80

Q3 2021

Shares 155,000 Value ($000) $23,392 Avg Close $148.13 Range $133.76 - $168.78

Q2 2021

Shares 110,500 Value ($000) $19,664 Avg Close $175.09 Range $158.98 - $192.11

Q1 2021

Shares 108,000 Value ($000) $20,026 Avg Close $161.78 Range $138.78 - $185.00

Q4 2020

Shares 85,000 Value ($000) $12,788 Avg Close $125.75 Range $101.82 - $152.08

Q3 2020

Shares 85,500 Value ($000) $9,340 Avg Close $112.47 Range $97.77 - $124.64

Q2 2020

Shares 85,500 Value ($000) $9,682 Avg Close $95.31 Range $70.45 - $112.06

Q1 2020

Shares 100,000 Value ($000) $8,146 Avg Close $97.84 Range $64.00 - $116.86

Q4 2019

Shares 95,000 Value ($000) $10,450 Avg Close $99.99 Range $81.07 - $109.78

Q3 2019

Shares 97,000 Value ($000) $8,951 Avg Close $78.64 Range $68.69 - $91.29

Q2 2019

Shares 103,000 Value ($000) $8,022 Avg Close $80.27 Range $67.03 - $98.53

Q1 2019

Shares 96,000 Value ($000) $8,932 Avg Close $76.40 Range $59.36 - $88.91

Q4 2018

Shares 98,000 Value ($000) $6,331 Avg Close $68.31 Range $53.35 - $77.61

Q3 2018

Shares 95,000 Value ($000) $7,615 Avg Close $86.11 Range $74.38 - $97.19

Q2 2018

Shares 93,000 Value ($000) $8,901 Avg Close $102.60 Range $86.55 - $115.42

Q1 2018

Shares 98,500 Value ($000) $11,391 Avg Close $103.13 Range $88.32 - $120.60

Q4 2017

Shares 101,000 Value ($000) $9,546 Avg Close $93.43 Range $82.69 - $103.63

Q3 2017

Shares 104,000 Value ($000) $9,822 Avg Close $76.52 Range $62.45 - $89.48

Q2 2017

Shares 104,000 Value ($000) $7,000 Avg Close $70.74 Range $60.40 - $82.65

Q1 2017

Shares 107,000 Value ($000) $7,356 Avg Close $61.31 Range $54.85 - $65.67

Q4 2016

Shares 148,500 Value ($000) $8,821 Avg Close $50.13 Range $43.15 - $57.04

Q3 2016

Shares 171,500 Value ($000) $8,528 Avg Close $43.66 Range $38.22 - $50.60

Q2 2016

Shares 185,000 Value ($000) $7,966 Avg Close $35.80 Range $32.24 - $39.81

Q1 2016

Shares 209,100 Value ($000) $7,873 Avg Close $31.35 Range $28.08 - $35.11

Q4 2015

Shares 216,600 Value ($000) $7,798 Avg Close $32.52 Range $26.43 - $35.02

Q3 2015

Shares 216,600 Value ($000) $7,263 Avg Close $31.60 Range $28.82 - $34.92

Q2 2015

Shares 216,600 Value ($000) $8,218 Avg Close $32.93 Range $29.54 - $35.95

Q1 2015

Shares 216,600 Value ($000) $7,324 Avg Close $31.63 Range $29.59 - $33.22

Q4 2014

Shares 216,600 Value ($000) $7,928 Avg Close $31.69 Range $27.30 - $33.99

Q3 2014

Shares 216,600 Value ($000) $7,230 Avg Close $29.19 Range $27.47 - $31.20

Q2 2014

Shares 216,600 Value ($000) $6,767 Avg Close $25.69 Range $23.72 - $27.88

Q1 2014

Shares 216,600 Value ($000) $6,475 Avg Close $26.46 Range $25.10 - $28.61

Q4 2013

Shares 216,600 Value ($000) $6,481 Avg Close $25.51 Range $23.10 - $27.14

Q3 2013

Shares 216,600 Value ($000) $5,760 Avg Close $23.28 Range $21.63 - $25.20

Q2 2013

Shares 189,100 Value ($000) $5,018 Avg Close $23.45 Range $21.31 - $25.25

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	130,500	$20,854	$148.21	$120.73 - $170.37
Q3 2025	130,750	$16,183	$106.31	$88.17 - $132.24
Q2 2025	128,750	$12,793	$80.86	$54.50 - $100.44
Q1 2025	128,750	$10,319	$100.21	$75.89 - $124.28
Q4 2024	129,000	$13,466	$106.91	$96.54 - $118.37
Q3 2024	124,500	$13,534	$117.45	$99.10 - $145.63
Q2 2024	123,000	$16,061	$124.55	$105.72 - $137.52
Q1 2024	173,000	$23,009	$114.51	$94.23 - $132.85
Q4 2023	187,000	$19,237	$79.84	$62.28 - $104.49
Q3 2023	157,000	$13,587	$95.58	$81.25 - $107.67
Q2 2023	121,000	$13,080	$89.53	$77.81 - $108.20
Q1 2023	121,500	$10,767	$93.12	$80.00 - $111.27
Q4 2022	139,500	$11,820	$78.00	$62.97 - $89.22
Q3 2022	115,500	$9,545	$100.01	$79.23 - $120.27
Q2 2022	153,000	$15,702	$112.92	$94.75 - $148.07
Q1 2022	137,000	$20,550	$150.35	$131.30 - $175.09
Q4 2021	137,000	$23,862	$151.09	$136.06 - $172.80
Q3 2021	155,000	$23,392	$148.13	$133.76 - $168.78
Q2 2021	110,500	$19,664	$175.09	$158.98 - $192.11
Q1 2021	108,000	$20,026	$161.78	$138.78 - $185.00
Q4 2020	85,000	$12,788	$125.75	$101.82 - $152.08
Q3 2020	85,500	$9,340	$112.47	$97.77 - $124.64
Q2 2020	85,500	$9,682	$95.31	$70.45 - $112.06
Q1 2020	100,000	$8,146	$97.84	$64.00 - $116.86
Q4 2019	95,000	$10,450	$99.99	$81.07 - $109.78
Q3 2019	97,000	$8,951	$78.64	$68.69 - $91.29
Q2 2019	103,000	$8,022	$80.27	$67.03 - $98.53
Q1 2019	96,000	$8,932	$76.40	$59.36 - $88.91
Q4 2018	98,000	$6,331	$68.31	$53.35 - $77.61
Q3 2018	95,000	$7,615	$86.11	$74.38 - $97.19
Q2 2018	93,000	$8,901	$102.60	$86.55 - $115.42
Q1 2018	98,500	$11,391	$103.13	$88.32 - $120.60
Q4 2017	101,000	$9,546	$93.43	$82.69 - $103.63
Q3 2017	104,000	$9,822	$76.52	$62.45 - $89.48
Q2 2017	104,000	$7,000	$70.74	$60.40 - $82.65
Q1 2017	107,000	$7,356	$61.31	$54.85 - $65.67
Q4 2016	148,500	$8,821	$50.13	$43.15 - $57.04
Q3 2016	171,500	$8,528	$43.66	$38.22 - $50.60
Q2 2016	185,000	$7,966	$35.80	$32.24 - $39.81
Q1 2016	209,100	$7,873	$31.35	$28.08 - $35.11
Q4 2015	216,600	$7,798	$32.52	$26.43 - $35.02
Q3 2015	216,600	$7,263	$31.60	$28.82 - $34.92
Q2 2015	216,600	$8,218	$32.93	$29.54 - $35.95
Q1 2015	216,600	$7,324	$31.63	$29.59 - $33.22
Q4 2014	216,600	$7,928	$31.69	$27.30 - $33.99
Q3 2014	216,600	$7,230	$29.19	$27.47 - $31.20
Q2 2014	216,600	$6,767	$25.69	$23.72 - $27.88
Q1 2014	216,600	$6,475	$26.46	$25.10 - $28.61
Q4 2013	216,600	$6,481	$25.51	$23.10 - $27.14
Q3 2013	216,600	$5,760	$23.28	$21.63 - $25.20
Q2 2013	189,100	$5,018	$23.45	$21.31 - $25.25