Thermo Fisher Scientific Inc.
MX ˙ BMV ˙ US8835561023
SecurityMX:TMO / Thermo Fisher Scientific Inc.
InstitutionCantillon Capital Management Llc
Latest Disclosed Ownership769,698 shares
Latest Disclosed Value $ 378,329,658
Cantillon Capital Management Llc reports 11.87% decrease in ownership of TMO / Thermo Fisher Scientific Inc.

On May 7, 2026 - Cantillon Capital Management Llc filed a 13F-HR form disclosing ownership of 769,698 shares of Thermo Fisher Scientific Inc. (MX:TMO) valued at $378,329,658 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 11, 2026 disclosing 873,322 shares of Thermo Fisher Scientific Inc.. This represents a change in shares of -11.87% during the quarter.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-07 2026-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 769,698 -103,624 -11.87 378,330 -25.24 2.5137
2026-02-11 2025-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 873,322 6,552 0.76 506,046 20.37 2.7363
2026-02-17 2025-09-30 13F/A-1 THERMO FISHER SCIENTIFIC INC COM USD1 COMMON STOCK 883556102 866,770 -9,495 -1.08 420,401 18.33 2.3147
2025-10-30 2025-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 866,770 -9,495 420,401 2.3147
2026-02-17 2025-06-30 13F/A-1 THERMO FISHER SCIENTIFIC INC COM USD1 COMMON STOCK 883556102 876,265 -25,508 -2.83 355,290 -20.82 2.0540
2025-07-30 2025-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 876,265 -25,508 355,290 2.0540
2026-02-17 2025-03-31 13F/A-1 THERMO FISHER SCIENTIFIC INC COM USD1 COMMON STOCK 883556102 901,773 -28,097 -3.02 448,722 -7.24 2.9058
2025-05-09 2025-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 901,773 -28,097 448,722 2.9058
2025-02-05 2024-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 929,870 130,870 16.38 483,746 -2.12 2.9234
2024-11-07 2024-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 799,000 -23,838 -2.90 494,237 8.62 3.0223
2024-08-05 2024-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 822,838 -41,876 -4.84 455,029 -9.46 3.0424
2024-05-08 2024-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 864,714 -17,303 -1.96 502,580 7.35 3.1608
2024-02-07 2023-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 882,017 -21,746 -2.41 468,166 2.34 3.1280
2023-11-06 2023-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 903,763 -3,451 -0.38 457,458 -3.36 3.3932
2023-08-09 2023-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 907,214 87,092 10.62 473,339 0.14 3.3088
2023-05-04 2023-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 820,122 -14,827 -1.78 472,694 2.80 3.8495
2023-02-06 2022-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 834,949 -16,490 -1.94 459,798 6.47 3.8941
2022-11-03 2022-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 851,439 -6,767 -0.79 431,842 -7.38 3.9112
2022-08-03 2022-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 858,206 -4,695 -0.54 466,246 -8.52 3.8918
2022-05-03 2022-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 862,901 24,611 2.94 509,673 -8.88 3.6391
2022-01-27 2021-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 838,290 -62,921 -6.98 559,340 8.63 3.6947
2021-10-26 2021-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 901,211 -15,459 -1.69 514,889 11.34 3.5108
2021-07-27 2021-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 916,670 -12,734 -1.37 462,433 9.02 3.1145
2021-05-03 2021-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 929,404 -34,796 -3.61 424,161 -5.55 3.0877
2021-02-03 2020-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 964,200 -4,781 -0.49 449,105 4.97 3.3675
2020-10-30 2020-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 968,981 -11,867 -1.21 427,824 20.38 3.5771
2020-07-31 2020-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 980,848 10,323 1.06 355,400 29.12 3.0874
2020-04-30 2020-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 970,525 -1,256 -0.13 275,241 -12.82 3.0432
2020-02-07 2019-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 971,781 -21,083 -2.12 315,702 9.17 2.9359
2019-11-04 2019-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 992,864 -8,117 -0.81 289,191 -1.63 2.8113
2019-07-26 2019-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 1,000,981 -20,764 -2.03 293,968 5.11 2.9703
2019-05-01 2019-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,021,745 -3,185 -0.31 279,672 21.93 2.9726
2019-02-05 2018-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,024,930 489,081 91.27 229,369 75.37 2.7683
2018-11-09 2018-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 535,849 535,849 130,790 1.4709
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.