L3VLUP
ProSign in

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 Dec 2025
the date the book describes
Filed
27 Oct 2026
latest of these filings; the earliest 5 Feb 2026
Managers listing it
29
at least, of 95 tracked, among listed positions
Comparable managers
92
filed both Q3 2025 and Q4 2025; 9 listed it in both
Shares listed
17,290,263
combined, among listed positions
Reported value
$2.8bn
combined, at the quarter end

Among the 92 comparable managers: 15 buyers (opened or added shares) and 15 sellers (trimmed or exited), at least, among listed positions. Their net change in shares was -427,712.

Managers listing MKSI in Q4 2025

Share of 13F value is the position’s reported value over everything the manager reported that quarter. The share change is against Q3 2025, and only where both filings list the position. A rise in value with no rise in shares is the price, not buying.

29 of 29 holders

ActionFiling
Invesco Ltd3,855,511$616m0.06%Added+1,472,14519 Feb 2026 (the filing on sec.gov)
Fidelity (FMR LLC)3,198,335$511munder 0.1%Trimmed-244,92917 Feb 2026 (the filing on sec.gov)
T. Rowe Price Associates Inc2,753,850$440munder 0.1%Trimmed-879,16917 Feb 2026 (the filing on sec.gov)
Wellington Management Group LLP2,552,021$408m0.07%Trimmed-461,77417 Feb 2026 (the filing on sec.gov)
Neuberger Berman Group LLC1,461,189$233m0.17%Trimmed-173,60727 Oct 2026 (the filing on sec.gov)
Millennium Management LLC817,251$131m0.05%Added+371,00317 Feb 2026 (the filing on sec.gov)
Point72 Asset Management LP625,799$100m0.11%Trimmed-387,75417 Feb 2026 (the filing on sec.gov)
Balyasny Asset Management LLC511,620$82m0.10%Trimmed-338,62517 Feb 2026 (the filing on sec.gov)
Citadel Advisors LLC457,873$73munder 0.1%Added+316,71517 Feb 2026 (the filing on sec.gov)
Jane Street Group LLC383,115$61munder 0.1%Added+251,47312 Feb 2026 (the filing on sec.gov)
AQR Capital Management LLC196,662$31munder 0.1%Added+26,66517 Feb 2026 (the filing on sec.gov)
Tudor Investment Corp104,482$17munder 0.1%Newnew17 Feb 2026 (the filing on sec.gov)
AllianceBernstein LP86,122$14munder 0.1%Added+1,41017 Feb 2026 (the filing on sec.gov)
Glenview Capital Management LLC74,200$12m0.24%Trimmed-97,72217 Feb 2026 (the filing on sec.gov)
Arrowstreet Capital LP55,082$8.8munder 0.1%Added+15,92813 Feb 2026 (the filing on sec.gov)
Two Sigma Investments LP29,358$4.7munder 0.1%Added+23,15817 Feb 2026 (the filing on sec.gov)
Janus Henderson Group Ltd29,070$4.6munder 0.1%Held017 Feb 2026 (the filing on sec.gov)
Squarepoint Ops LLC26,648$4.3munder 0.1%Newnew13 Feb 2026 (the filing on sec.gov)
Light Street Capital Management LLC19,582$3.1m0.48%Newnew17 Feb 2026 (the filing on sec.gov)
Walleye Capital LLC11,453$1.8munder 0.1%Trimmed-38,83513 Feb 2026 (the filing on sec.gov)
PDT Partners LLC10,070$1.6m0.10%Held017 Feb 2026 (the filing on sec.gov)
Caxton Associates LLP7,811$1.2munder 0.1%Newnew13 Feb 2026 (the filing on sec.gov)
Brevan Howard Capital Management LP7,275$1.2munder 0.1%Trimmed-29,05917 Feb 2026 (the filing on sec.gov)
GAMCO Investors Inc3,885$621kunder 0.1%Trimmed-4,0005 Feb 2026 (the filing on sec.gov)
Verition Fund Management LLC3,590$574kunder 0.1%Trimmed-2,31313 Feb 2026 (the filing on sec.gov)
Page 1 of 2

Largest increases and reductions, by shares

Q3 2025 to Q4 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 (7)

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 →