MKS INSTRS INC

Ticker: MKSI CUSIP: 55306N104 Class: EQTY

ALLIANCEBERNSTEIN L.P.'s Holding History (CIK: 0001109448)

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

Q4 2025

Shares 86,122 Value ($000) $13,762 Avg Close $148.21 Range $120.73 - $170.37

Q3 2025

Shares 84,712 Value ($000) $10,485 Avg Close $106.31 Range $88.17 - $132.24

Q2 2025

Shares 85,890 Value ($000) $8,534 Avg Close $80.86 Range $54.50 - $100.44

Q1 2025

Shares 87,165 Value ($000) $6,986 Avg Close $100.21 Range $75.89 - $124.28

Q4 2024

Shares 88,486 Value ($000) $9,237 Avg Close $106.91 Range $96.54 - $118.37

Q3 2024

Shares 90,999 Value ($000) $9,893 Avg Close $117.45 Range $99.10 - $145.63

Q2 2024

Shares 88,045 Value ($000) $11,497 Avg Close $124.55 Range $105.72 - $137.52

Q1 2024

Shares 91,244 Value ($000) $12,135 Avg Close $114.51 Range $94.23 - $132.85

Q4 2023

Shares 92,573 Value ($000) $9,523 Avg Close $79.84 Range $62.28 - $104.49

Q3 2023

Shares 91,481 Value ($000) $7,917 Avg Close $95.58 Range $81.25 - $107.67

Q2 2023

Shares 88,341 Value ($000) $9,550 Avg Close $89.53 Range $77.81 - $108.20

Q1 2023

Shares 85,496 Value ($000) $7,577 Avg Close $93.12 Range $80.00 - $111.27

Q4 2022

Shares 216,323 Value ($000) $18,329 Avg Close $78.00 Range $62.97 - $89.22

Q3 2022

Shares 351,074 Value ($000) $29,013 Avg Close $100.01 Range $79.23 - $120.27

Q2 2022

Shares 314,728 Value ($000) $32,301 Avg Close $112.92 Range $94.75 - $148.07

Q1 2022

Shares 361,955 Value ($000) $54,293 Avg Close $150.35 Range $131.30 - $175.09

Q4 2021

Shares 470,078 Value ($000) $81,873 Avg Close $151.09 Range $136.06 - $172.80

Q3 2021

Shares 468,679 Value ($000) $70,728 Avg Close $148.13 Range $133.76 - $168.78

Q2 2021

Shares 1,443,473 Value ($000) $256,866 Avg Close $175.09 Range $158.98 - $192.11

Q1 2021

Shares 1,455,373 Value ($000) $269,855 Avg Close $161.78 Range $138.78 - $185.00

Q4 2020

Shares 1,602,455 Value ($000) $241,089 Avg Close $125.75 Range $101.82 - $152.08

Q3 2020

Shares 1,748,473 Value ($000) $190,986 Avg Close $112.47 Range $97.77 - $124.64

Q2 2020

Shares 1,438,256 Value ($000) $162,868 Avg Close $95.31 Range $70.45 - $112.06

Q1 2020

Shares 746,335 Value ($000) $60,789 Avg Close $97.84 Range $64.00 - $116.86

Q4 2019

Shares 171,593 Value ($000) $18,877 Avg Close $99.99 Range $81.07 - $109.78

Q3 2019

Shares 168,527 Value ($000) $15,552 Avg Close $78.64 Range $68.69 - $91.29

Q2 2019

Shares 125,066 Value ($000) $9,741 Avg Close $80.27 Range $67.03 - $98.53

Q1 2019

Shares 119,196 Value ($000) $11,091 Avg Close $76.40 Range $59.36 - $88.91

Q4 2018

Shares 123,716 Value ($000) $7,993 Avg Close $68.31 Range $53.35 - $77.61

Q3 2018

Shares 48,050 Value ($000) $3,851 Avg Close $86.11 Range $74.38 - $97.19

Q2 2018

Shares 43,436 Value ($000) $4,157 Avg Close $102.60 Range $86.55 - $115.42

Q1 2018

Shares 135,690 Value ($000) $15,693 Avg Close $103.13 Range $88.32 - $120.60

Q4 2017

Shares 141,120 Value ($000) $13,336 Avg Close $93.43 Range $82.69 - $103.63

Q3 2017

Shares 139,784 Value ($000) $13,203 Avg Close $76.52 Range $62.45 - $89.48

Q2 2017

Shares 114,544 Value ($000) $7,709 Avg Close $70.74 Range $60.40 - $82.65

Q1 2017

Shares 82,304 Value ($000) $5,658 Avg Close $61.31 Range $54.85 - $65.67

Q4 2016

Shares 87,504 Value ($000) $5,198 Avg Close $50.13 Range $43.15 - $57.04

Q3 2016

Shares 514,629 Value ($000) $25,593 Avg Close $43.66 Range $38.22 - $50.60

Q2 2016

Shares 646,869 Value ($000) $27,854 Avg Close $35.80 Range $32.24 - $39.81

Q1 2016

Shares 628,229 Value ($000) $23,653 Avg Close $31.35 Range $28.08 - $35.11

Q4 2015

Shares 650,229 Value ($000) $23,408 Avg Close $32.52 Range $26.43 - $35.02

Q3 2015

Shares 588,179 Value ($000) $19,722 Avg Close $31.60 Range $28.82 - $34.92

Q2 2015

Shares 562,799 Value ($000) $21,353 Avg Close $32.93 Range $29.54 - $35.95

Q1 2015

Shares 582,694 Value ($000) $19,701 Avg Close $31.63 Range $29.59 - $33.22

Q4 2014

Shares 592,074 Value ($000) $21,670 Avg Close $31.69 Range $27.30 - $33.99

Q3 2014

Shares 694,454 Value ($000) $23,181 Avg Close $29.19 Range $27.47 - $31.20

Q2 2014

Shares 643,844 Value ($000) $20,114 Avg Close $25.69 Range $23.72 - $27.88

Q1 2014

Shares 1,535,518 Value ($000) $45,897 Avg Close $26.46 Range $25.10 - $28.61

Q4 2013

Shares 1,631,682 Value ($000) $48,853 Avg Close $25.51 Range $23.10 - $27.14

Q3 2013

Shares 1,642,721 Value ($000) $43,680 Avg Close $23.28 Range $21.63 - $25.20

Q2 2013

Shares 1,674,280 Value ($000) $44,435 Avg Close $23.45 Range $21.31 - $25.25

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	86,122	$13,762	$148.21	$120.73 - $170.37
Q3 2025	84,712	$10,485	$106.31	$88.17 - $132.24
Q2 2025	85,890	$8,534	$80.86	$54.50 - $100.44
Q1 2025	87,165	$6,986	$100.21	$75.89 - $124.28
Q4 2024	88,486	$9,237	$106.91	$96.54 - $118.37
Q3 2024	90,999	$9,893	$117.45	$99.10 - $145.63
Q2 2024	88,045	$11,497	$124.55	$105.72 - $137.52
Q1 2024	91,244	$12,135	$114.51	$94.23 - $132.85
Q4 2023	92,573	$9,523	$79.84	$62.28 - $104.49
Q3 2023	91,481	$7,917	$95.58	$81.25 - $107.67
Q2 2023	88,341	$9,550	$89.53	$77.81 - $108.20
Q1 2023	85,496	$7,577	$93.12	$80.00 - $111.27
Q4 2022	216,323	$18,329	$78.00	$62.97 - $89.22
Q3 2022	351,074	$29,013	$100.01	$79.23 - $120.27
Q2 2022	314,728	$32,301	$112.92	$94.75 - $148.07
Q1 2022	361,955	$54,293	$150.35	$131.30 - $175.09
Q4 2021	470,078	$81,873	$151.09	$136.06 - $172.80
Q3 2021	468,679	$70,728	$148.13	$133.76 - $168.78
Q2 2021	1,443,473	$256,866	$175.09	$158.98 - $192.11
Q1 2021	1,455,373	$269,855	$161.78	$138.78 - $185.00
Q4 2020	1,602,455	$241,089	$125.75	$101.82 - $152.08
Q3 2020	1,748,473	$190,986	$112.47	$97.77 - $124.64
Q2 2020	1,438,256	$162,868	$95.31	$70.45 - $112.06
Q1 2020	746,335	$60,789	$97.84	$64.00 - $116.86
Q4 2019	171,593	$18,877	$99.99	$81.07 - $109.78
Q3 2019	168,527	$15,552	$78.64	$68.69 - $91.29
Q2 2019	125,066	$9,741	$80.27	$67.03 - $98.53
Q1 2019	119,196	$11,091	$76.40	$59.36 - $88.91
Q4 2018	123,716	$7,993	$68.31	$53.35 - $77.61
Q3 2018	48,050	$3,851	$86.11	$74.38 - $97.19
Q2 2018	43,436	$4,157	$102.60	$86.55 - $115.42
Q1 2018	135,690	$15,693	$103.13	$88.32 - $120.60
Q4 2017	141,120	$13,336	$93.43	$82.69 - $103.63
Q3 2017	139,784	$13,203	$76.52	$62.45 - $89.48
Q2 2017	114,544	$7,709	$70.74	$60.40 - $82.65
Q1 2017	82,304	$5,658	$61.31	$54.85 - $65.67
Q4 2016	87,504	$5,198	$50.13	$43.15 - $57.04
Q3 2016	514,629	$25,593	$43.66	$38.22 - $50.60
Q2 2016	646,869	$27,854	$35.80	$32.24 - $39.81
Q1 2016	628,229	$23,653	$31.35	$28.08 - $35.11
Q4 2015	650,229	$23,408	$32.52	$26.43 - $35.02
Q3 2015	588,179	$19,722	$31.60	$28.82 - $34.92
Q2 2015	562,799	$21,353	$32.93	$29.54 - $35.95
Q1 2015	582,694	$19,701	$31.63	$29.59 - $33.22
Q4 2014	592,074	$21,670	$31.69	$27.30 - $33.99
Q3 2014	694,454	$23,181	$29.19	$27.47 - $31.20
Q2 2014	643,844	$20,114	$25.69	$23.72 - $27.88
Q1 2014	1,535,518	$45,897	$26.46	$25.10 - $28.61
Q4 2013	1,631,682	$48,853	$25.51	$23.10 - $27.14
Q3 2013	1,642,721	$43,680	$23.28	$21.63 - $25.20
Q2 2013	1,674,280	$44,435	$23.45	$21.31 - $25.25