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TMO in the 13F filings

Thermo Fisher Scientific Inc · CUSIP 883556102

Sector · IndustrialsTheme · Healthcare: biopharma and medtech· 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 22 Jan 2026
Managers listing it
45
at least, of 95 tracked, among listed positions
Comparable managers
92
filed both Q3 2025 and Q4 2025; 29 listed it in both
Shares listed
52,150,282
combined, among listed positions
Reported value
$30.2bn
combined, at the quarter end

Among the 92 comparable managers: 27 buyers (opened or added shares) and 20 sellers (trimmed or exited), at least, among listed positions. Their net change in shares was +5,857,143.

Managers listing TMO 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.

45 of 45 holders

ActionFiling
Capital World Investors11,003,814$6.4bn0.87%Added+718,66911 Feb 2026 (the filing on sec.gov)
Fidelity (FMR LLC)9,793,347$5.7bn0.29%Added+2,199,53817 Feb 2026 (the filing on sec.gov)
T. Rowe Price Associates Inc7,701,353$4.5bn0.48%Added+1,230,87217 Feb 2026 (the filing on sec.gov)
Wellington Management Group LLP3,468,240$2.0bn0.35%Added+768,78017 Feb 2026 (the filing on sec.gov)
MFS Investment Management3,087,666$1.8bn0.58%Added+150,66822 Jan 2026 (the filing on sec.gov)
Capital Research Global Investors2,914,901$1.7bn0.31%Trimmed-247,76111 Feb 2026 (the filing on sec.gov)
AllianceBernstein LP2,449,523$1.4bn0.45%Trimmed-92,21817 Feb 2026 (the filing on sec.gov)
Invesco Ltd2,163,261$1.3bn0.12%Added+247,97519 Feb 2026 (the filing on sec.gov)
Janus Henderson Group Ltd1,096,959$636m0.28%Trimmed-140,90317 Feb 2026 (the filing on sec.gov)
Marshall Wace LLP953,828$553m0.50%Added+448,36513 Feb 2026 (the filing on sec.gov)
Neuberger Berman Group LLC899,816$521m0.39%Added+32,20027 Oct 2026 (the filing on sec.gov)
Arrowstreet Capital LP867,512$503m0.29%Trimmed-398,61313 Feb 2026 (the filing on sec.gov)
Viking Global Investors LP793,187$460m1.22%Newnew17 Feb 2026 (the filing on sec.gov)
Baillie Gifford & Co770,868$447m0.37%Added+279,63523 Jan 2026 (the filing on sec.gov)
Citadel Advisors LLC690,405$400m0.06%Added+340,70417 Feb 2026 (the filing on sec.gov)
Jane Street Group LLC666,711$386m0.06%Added+506,95812 Feb 2026 (the filing on sec.gov)
Farallon Capital Management LLC635,685$368m1.59%Trimmed-622,55617 Feb 2026 (the filing on sec.gov)
Point72 Asset Management LP436,858$253m0.28%Added+267,40717 Feb 2026 (the filing on sec.gov)
Artisan Partners LP300,931$174m0.26%Added+10,69017 Feb 2026 (the filing on sec.gov)
Glenview Capital Management LLC223,947$130m2.64%Trimmed-58,99417 Feb 2026 (the filing on sec.gov)
Holocene Advisors LP216,501$125m0.26%Added+120,20917 Feb 2026 (the filing on sec.gov)
Woodline Partners LP206,349$120m0.46%Added+167,41117 Feb 2026 (the filing on sec.gov)
Susquehanna International Group LLP193,555$112munder 0.1%Trimmed-20,81417 Feb 2026 (the filing on sec.gov)
AQR Capital Management LLC144,752$84munder 0.1%Trimmed-10,85617 Feb 2026 (the filing on sec.gov)
Steadfast Capital Management LP92,981$54m0.93%Added+4,88117 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 (5)

Exited (5)

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.
30 in Q3 2024 to 36 in Q2 2026

Tracked managers listing it, at least.

02040602014201620182020202220242026
the quarter shown share split complete books; unmarked quarters rest on listed positionsClick a quarter to open it.
TMO by quarter
QuarterHoldersReported valueBuyersSellers
Q2 201319$8.8bnn.a.n.a.
Q3 201319$10.1bnn.a.n.a.
Q4 201319$12.6bnn.a.n.a.
Q1 201422$12.8bnn.a.n.a.
Q2 201422$12.9bnn.a.n.a.
Q3 201422$13.6bnn.a.n.a.
Q4 201430$14.7bnn.a.n.a.
Q1 201527$15.0bnn.a.n.a.
Q2 201527$14.1bnn.a.n.a.
Q3 201520$13.5bnn.a.n.a.
Q4 201521$15.4bnn.a.n.a.
Q1 201621$14.7bnn.a.n.a.
Q2 201620$14.9bnn.a.n.a.
Q3 201618$15.7bnn.a.n.a.
Q4 201631$13.2bnn.a.n.a.
Q1 201727$13.8bnn.a.n.a.
Q2 201729$15.7bnn.a.n.a.
Q3 201728$17.9bnn.a.n.a.
Q4 201720$18.2bnn.a.n.a.
Q1 201828$20.1bnn.a.n.a.
Q2 201827$19.9bnn.a.n.a.
Q3 201827$23.6bnn.a.n.a.
Q4 201830$21.6bnn.a.n.a.
Q1 201930$27.4bnn.a.n.a.
Q2 201933$28.8bnn.a.n.a.
Q3 201926$27.9bnn.a.n.a.
Q4 201926$30.3bnn.a.n.a.
Q1 202027$25.8bnn.a.n.a.
Q2 202029$32.6bnn.a.n.a.
Q3 202029$38.9bnn.a.n.a.
Q4 202033$39.2bnn.a.n.a.
Q1 202135$36.5bnn.a.n.a.
Q2 202133$38.3bnn.a.n.a.
Q3 202132$42.6bnn.a.n.a.
Q4 202138$50.1bnn.a.n.a.
Q1 202232$43.2bnn.a.n.a.
Q2 202233$38.9bnn.a.n.a.
Q3 202226$34.3bnn.a.n.a.
Q4 202229$37.0bnn.a.n.a.
Q1 202335$37.1bnn.a.n.a.
Q2 202339$33.5bnn.a.n.a.
Q3 202339$32.6bnn.a.n.a.
Q4 202341$32.7bn1923
Q1 202430$34.1bn1418
Q2 202438$30.6bn2518
Q3 202430$33.8bn1219
Q4 202436$27.6bn2215
Q1 202531$24.2bn1222
Q2 202539$18.8bn2711
Q3 202532$21.9bn2213
Q4 202532$29.9bn2720
Q1 202634$24.4bn2323
Q2 202636$26.4bn2722

Compare with…

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

TMO and LLY →TMO and JNJ →TMO and VRTX →Choose a stock to compare with TMO →

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 TMO, latest filings →Back to the 13F Explorer →