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MKSI in the 13F filings

MKS Instruments Inc · CUSIP 55306N104

Sector · IndustrialsTheme · AI infrastructure and semiconductors· L3VLUP-definedTheme · Industrials and automation· L3VLUP-defined
Quarter
Q3 2026 · early filersQ2 2026Q1 2026Q4 2025Q3 2025Q2 2025Q1 2025Q4 2024Q3 2024Q2 2024Q1 2024Q4 2023
Quarter end
31 Mar 2026
the date the book describes
Filed
27 Oct 2026
latest of these filings; the earliest 12 May 2026
Managers listing it
37
at least, of 95 tracked, among listed positions
Comparable managers
91
filed both Q4 2025 and Q1 2026; 12 listed it in both
Shares listed
19,637,693
combined, among listed positions
Reported value
$4.5bn
combined, at the quarter end

AllianceBernstein LP. Values in this filing are at the previous quarter end's prices; its share count is the quarter end's.

Among the 91 comparable managers: 28 buyers (opened or added shares) and 12 sellers (trimmed or exited), at least, among listed positions. Their net change in shares was +2,349,530.

Managers listing MKSI in Q1 2026

Share of 13F value is the position’s reported value over everything the manager reported that quarter. The share change is against Q4 2025, and only where both filings list the position. A rise in value with no rise in shares is the price, not buying.

37 of 37 holders

ActionFiling
Invesco Ltd3,721,459$855m0.08%Trimmed-134,05212 May 2026 (the filing on sec.gov)
Fidelity (FMR LLC)1,933,843$444munder 0.1%Trimmed-1,264,49215 May 2026 (the filing on sec.gov)
Wellington Management Group LLP1,833,137$421m0.08%Trimmed-718,88415 May 2026 (the filing on sec.gov)
T. Rowe Price Associates Inc1,700,148$391munder 0.1%Trimmed-1,053,70215 May 2026 (the filing on sec.gov)
Point72 Asset Management LP1,610,331$370m0.47%Added+984,53215 May 2026 (the filing on sec.gov)
Neuberger Berman Group LLC1,433,529$329m0.25%Trimmed-27,66027 Oct 2026 (the filing on sec.gov)
Whale Rock Capital Management LLC1,306,724$300m3.88%Newnew15 May 2026 (the filing on sec.gov)
Capital World Investors1,277,200$294munder 0.1%Newnew13 May 2026 (the filing on sec.gov)
Citadel Advisors LLC947,032$218munder 0.1%Added+489,15915 May 2026 (the filing on sec.gov)
Millennium Management LLC894,369$206m0.09%Added+77,11815 May 2026 (the filing on sec.gov)
AQR Capital Management LLC616,497$137m0.06%Added+419,83515 May 2026 (the filing on sec.gov)
Balyasny Asset Management LLC407,395$94m0.12%Trimmed-104,22515 May 2026 (the filing on sec.gov)
Two Sigma Investments LP278,687$64m0.05%Added+249,32915 May 2026 (the filing on sec.gov)
Jane Street Group LLC243,253$56munder 0.1%Trimmed-139,86212 May 2026 (the filing on sec.gov)
AllianceBernstein LP319,921$51munder 0.1%Added+233,79915 May 2026 (the filing on sec.gov)
Voloridge Investment Management LLC166,066$38m0.15%Newnew15 May 2026 (the filing on sec.gov)
Light Street Capital Management LLC122,264$28m5.26%Added+102,68215 May 2026 (the filing on sec.gov)
D. E. Shaw & Co.120,173$28munder 0.1%Newnew15 May 2026 (the filing on sec.gov)
Renaissance Technologies LLC103,603$24munder 0.1%Newnew14 May 2026 (the filing on sec.gov)
Marshall Wace LLP98,690$23munder 0.1%Newnew15 May 2026 (the filing on sec.gov)
Tudor Investment Corp81,280$19munder 0.1%Trimmed-23,20215 May 2026 (the filing on sec.gov)
Walleye Capital LLC79,188$18m0.08%Added+67,73513 May 2026 (the filing on sec.gov)
PDT Partners LLC76,801$18m1.04%Added+66,73115 May 2026 (the filing on sec.gov)
ExodusPoint Capital Management LP60,098$14m0.11%Newnew14 May 2026 (the filing on sec.gov)
Acadian Asset Management LLC41,299$9.5munder 0.1%Added+40,74413 May 2026 (the filing on sec.gov)
Page 1 of 2

Largest increases and reductions, by shares

Q4 2025 to Q1 2026, among managers that listed it in both quarters or opened it.

Increases

Reductions

New positions and exits

At least these many: a manager is shown exiting only where its own filing shows the position gone.

New (12)

Exited (3)

Ownership over time

Every quarter on file. A quarter-end value moves with the price as well as with the shares held; buyers and sellers count comparable managers, by shares.
10 in Q3 2024 to 27 in Q2 2026

Tracked managers listing it, at least.

01020302014201620182020202220242026
the quarter shown share split complete books; unmarked quarters rest on listed positionsClick a quarter to open it.
MKSI by quarter
QuarterHoldersReported valueBuyersSellers
Q2 20133$86mn.a.n.a.
Q3 20134$94mn.a.n.a.
Q4 20132$88mn.a.n.a.
Q1 20142$83mn.a.n.a.
Q2 20141$37mn.a.n.a.
Q3 20141$35mn.a.n.a.
Q4 20143$40mn.a.n.a.
Q1 20151$20mn.a.n.a.
Q2 20151$19mn.a.n.a.
Q3 20152$16mn.a.n.a.
Q4 20151$13mn.a.n.a.
Q1 20163$47mn.a.n.a.
Q2 20162$179mn.a.n.a.
Q3 20162$284mn.a.n.a.
Q4 20164$520mn.a.n.a.
Q1 20176$464mn.a.n.a.
Q2 20179$378mn.a.n.a.
Q3 201712$634mn.a.n.a.
Q4 20179$464mn.a.n.a.
Q1 201810$700mn.a.n.a.
Q2 201810$622mn.a.n.a.
Q3 20188$515mn.a.n.a.
Q4 20188$478mn.a.n.a.
Q1 20198$729mn.a.n.a.
Q2 20195$546mn.a.n.a.
Q3 20195$691mn.a.n.a.
Q4 20198$878mn.a.n.a.
Q1 20208$789mn.a.n.a.
Q2 20207$1.1bnn.a.n.a.
Q3 20209$1.2bnn.a.n.a.
Q4 20207$1.6bnn.a.n.a.
Q1 20218$2.0bnn.a.n.a.
Q2 20218$1.8bnn.a.n.a.
Q3 202110$1.0bnn.a.n.a.
Q4 20217$1.2bnn.a.n.a.
Q1 20226$924mn.a.n.a.
Q2 20229$519mn.a.n.a.
Q3 20227$378mn.a.n.a.
Q4 20227$457mn.a.n.a.
Q1 20235$478mn.a.n.a.
Q2 202311$1.2bnn.a.n.a.
Q3 20238$859mn.a.n.a.
Q4 20239$1.9bn54
Q1 20247$2.5bn24
Q2 20249$2.5bn62
Q3 202410$1.5bn63
Q4 20246$862m33
Q1 20259$817m71
Q2 20257$1.1bn43
Q3 202510$1.6bn63
Q4 202513$2.6bn1515
Q1 202622$3.8bn2812
Q2 202627$8.5bn1827

Compare with…

Holders over time, buyers and sellers, and the managers holding both, side by side for up to four stocks.

MKSI and NVDA →MKSI and AVGO →MKSI and MU →Choose a stock to compare with MKSI →

How much of the picture this is

A 13F is a manager’s long US-listed equity book at a quarter end, filed up to 45 days later. It shows no shorts, cash, bonds or performance, and it is never today’s portfolio. Large books are listed to their largest positions, so a manager missing from this table may still hold a small position below that line. These are 95 tracked managers, not the institutional market.

Which funds own MKSI, latest filings →Back to the 13F Explorer →