Thermo Fisher Scientific Inc.
MX ˙ BMV ˙ US8835561023
SecurityMX:TMO / Thermo Fisher Scientific Inc.
InstitutionMader & Shannon Wealth Management, Inc.
Latest Disclosed Ownership18,200 shares
Latest Disclosed Value $ 8,945,846
Mader & Shannon Wealth Management, Inc. reports 23.87% increase in ownership of TMO / Thermo Fisher Scientific Inc.

On April 13, 2026 - Mader & Shannon Wealth Management, Inc. filed a 13F-HR form disclosing ownership of 18,200 shares of Thermo Fisher Scientific Inc. (MX:TMO) valued at $8,945,846 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 29, 2026 disclosing 14,693 shares of Thermo Fisher Scientific Inc.. This represents a change in shares of 23.87% 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)
2026-04-13 2026-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 18,200 3,507 23.87 8,946 25.53 4.1402
2026-01-29 2025-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 14,693 0 0.00 7,126 0.00 3.4928
2025-11-12 2025-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 14,693 240 1.66 7,126 21.60 3.4928
2025-07-31 2025-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 14,453 72 0.50 5,860 -18.10 3.1919
2025-05-05 2025-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 14,381 1,158 8.76 7,156 4.01 4.0828
2025-02-03 2024-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 13,223 -58 -0.44 6,879 -16.26 4.2533
2024-11-12 2024-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 13,281 -750 -5.35 8,215 5.88 4.7768
2024-08-01 2024-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 14,031 -672 -4.57 7,759 -9.20 4.6643
2024-05-13 2024-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 14,703 891 6.45 8,546 16.56 4.7927
2024-01-24 2023-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 13,812 201 1.48 7,331 6.42 4.1702
2023-11-07 2023-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 13,611 242 1.81 6,889 -1.23 4.5286
2023-08-08 2023-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 13,369 600 4.70 6,975 -5.22 4.3072
2023-05-10 2023-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 12,769 -1,801 -12.36 7,360 -8.29 4.8542
2023-01-24 2022-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 14,570 3,355 29.92 8,024 41.07 5.3110
2022-10-27 2022-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 11,215 93 0.84 5,688 -5.86 6.1970
2022-07-26 2022-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 11,122 -2,651 -19.25 6,042 -25.73 3.6100
2022-05-05 2022-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 13,773 451 3.39 8,135 -8.48 4.4152
2022-01-28 2021-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 13,322 190 1.45 8,889 18.47 4.9193
2021-11-01 2021-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 13,132 -2 -0.02 7,503 13.24 4.7933
2021-08-11 2021-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 13,134 3,418 35.18 6,626 49.44 3.4136
2021-05-03 2021-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 9,716 -70 -0.72 4,434 -2.72 2.5940
2021-02-02 2020-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 9,786 618 6.74 4,558 12.63 3.0202
2020-11-05 2020-09-30 13F THERMO FISHER SCIENTIFIC COM COM 883556102 9,168 108 1.19 4,047 23.31 3.1654
2020-08-13 2020-06-30 13F THERMO FISHER SCIENTIFIC COM COM 883556102 9,060 279 3.18 3,282 31.81 2.6717
2020-05-12 2020-03-31 13F THERMO FISHER SCIENTIFIC COM COM 883556102 8,781 -372 -4.06 2,490 -16.25 2.2032
2020-02-11 2019-12-31 13F THERMO FISHER SCIENTIFIC COM COM 883556102 9,153 282 3.18 2,973 15.10 2.3945
2019-11-07 2019-09-30 13F THERMO FISHER SCIENTIFIC COM COM 883556102 8,871 -285 -3.11 2,584 -3.91 2.0463
2019-08-13 2019-06-30 13F THERMO FISHER SCIENTIFIC COM COM 883556102 9,156 5,802 172.99 2,689 192.81 2.2859
2019-04-30 2019-03-31 13F THERMO FISHER SCIENTIFIC COM COM 883556102 3,354 -203 -5.71 918 15.33 0.8230
2019-02-13 2018-12-31 13F THERMO FISHER SCIENTIFIC COM COM 883556102 3,557 3,557 796 0.6484
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.