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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
30 Sep 2025
the date the book describes
Filed
27 Oct 2026
latest of these filings; the earliest 13 Nov 2025
Managers listing it
10
at least, of 95 tracked, among listed positions
Comparable managers
95
filed both Q2 2025 and Q3 2025; 6 listed it in both
Shares listed
13,134,253
combined, among listed positions
Reported value
$1.6bn
combined, at the quarter end

Among the 95 comparable managers: 6 buyers (opened or added shares) and 3 sellers (trimmed or exited), at least, among listed positions. Their net change in shares is not known from listed positions, because at least one of them lists it in only one of the two quarters.

Managers listing MKSI in Q3 2025

Share of 13F value is the position’s reported value over everything the manager reported that quarter. The share change is against Q2 2025, and only where both filings list the position. A rise in value with no rise in shares is the price, not buying.

10 of 10 holders

ActionFiling
T. Rowe Price Associates Inc3,633,019$450munder 0.1%Trimmed-496,10914 Nov 2025 (the filing on sec.gov)
Wellington Management Group LLP3,013,795$373m0.07%Added+14,34114 Nov 2025 (the filing on sec.gov)
Invesco Ltd2,383,366$295munder 0.1%Addedn.a.13 Nov 2025 (the filing on sec.gov)
Neuberger Berman Group LLC1,634,796$202m0.15%Trimmed-253,82527 Oct 2026 (the filing on sec.gov)
Point72 Asset Management LP1,013,553$125m0.21%Newnew14 Nov 2025 (the filing on sec.gov)
Balyasny Asset Management LLC850,245$105m0.13%Added+117,56314 Nov 2025 (the filing on sec.gov)
Capital Research Global Investors387,153$48munder 0.1%Held013 Nov 2025 (the filing on sec.gov)
Glenview Capital Management LLC171,922$21m0.47%Trimmed-60,37414 Nov 2025 (the filing on sec.gov)
Brevan Howard Capital Management LP36,334$4.5munder 0.1%Addedn.a.14 Nov 2025 (the filing on sec.gov)
PDT Partners LLC10,070$1.2m0.08%Newnew17 Nov 2025 (the filing on sec.gov)

Largest increases and reductions, by shares

Q2 2025 to Q3 2025, 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 (2)

Exited (0)

No exit shown by a manager’s own filing.

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 →