Thermo Fisher Scientific Inc.
MX ˙ BMV ˙ US8835561023
SecurityMX:TMO / Thermo Fisher Scientific Inc.
InstitutionMarietta Wealth Management, LLC
Latest Disclosed Ownership17,632 shares
Latest Disclosed Value $ 8,666,657
Marietta Wealth Management, LLC reports 2.39% increase in ownership of TMO / Thermo Fisher Scientific Inc.

On April 21, 2026 - Marietta Wealth Management, LLC filed a 13F-HR form disclosing ownership of 17,632 shares of Thermo Fisher Scientific Inc. (MX:TMO) valued at $8,666,657 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 28, 2026 disclosing 17,220 shares of Thermo Fisher Scientific Inc.. This represents a change in shares of 2.39% 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)
2026-04-21 2026-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 17,632 412 2.39 8,667 -13.15 1.0300
2026-01-28 2025-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 17,220 110 0.64 9,978 20.25 1.1542
2025-10-20 2025-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 17,110 711 4.34 8,299 24.80 1.0148
2025-07-22 2025-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 16,399 1,007 6.54 6,649 -13.19 0.8670
2025-04-22 2025-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 15,392 1,365 9.73 7,659 4.96 1.1243
2025-01-24 2024-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 14,027 708 5.32 7,297 -11.42 1.0468
2024-10-22 2024-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 13,319 366 2.83 8,239 15.01 1.1970
2024-07-19 2024-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 12,953 134 1.05 7,163 -3.85 1.1166
2024-04-25 2024-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 12,819 44 0.34 7,451 9.88 1.2296
2024-01-30 2023-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 12,775 -299 -2.29 6,781 2.46 1.2079
2023-10-30 2023-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 13,074 -15 -0.11 6,618 -3.10 1.3147
2023-07-18 2023-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 13,089 454 3.59 6,829 -6.22 1.2869
2023-04-27 2023-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 12,635 -298 -2.30 7,282 2.25 1.5463
2023-01-30 2022-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 12,933 152 1.19 7,122 9.87 1.6107
2022-10-20 2022-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 12,781 17 0.13 6,482 -6.52 1.6177
2022-08-08 2022-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 12,764 -148 -1.15 6,934 -9.07 1.6765
2022-04-12 2022-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 12,912 529 4.27 7,626 -7.70 1.5948
2022-01-28 2021-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 12,383 -129 -1.03 8,262 15.58 1.6597
2021-11-12 2021-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 12,512 205 1.67 7,148 15.12 1.5611
2021-08-12 2021-06-30 13F Thermo Fisher Scientific com 883556102 12,307 389 3.26 6,209 14.16 1.4011
2021-05-06 2021-03-31 13F Thermo Fisher Scientific com 883556102 11,918 597 5.27 5,439 3.15 1.3549
2021-02-09 2020-12-31 13F Thermo Fisher Scientific com 883556102 11,321 285 2.58 5,273 8.21 1.4501
2020-11-04 2020-09-30 13F Thermo Fisher Scientific com 883556102 11,036 1,162 11.77 4,873 36.19 1.5194
2020-08-05 2020-06-30 13F Thermo Fisher Scientific com 883556102 9,874 2,965 42.92 3,578 82.64 1.2222
2020-05-14 2020-03-31 13F Thermo Fisher Scientific com 883556102 6,909 2,845 70.00 1,959 48.41 0.7634
2020-02-07 2019-12-31 13F Thermo Fisher Scientific com 883556102 4,064 -16 -0.39 1,320 11.11 0.4352
2019-11-14 2019-09-30 13F Thermo Fisher Scientific com 883556102 4,080 -54 -1.31 1,188 -2.14 0.4330
2019-08-14 2019-06-30 13F Thermo Fisher Scientific com 883556102 4,134 -170 -3.95 1,214 3.06 0.4727
2019-05-09 2019-03-31 13F Thermo Fisher Scientific com 883556102 4,304 0 0.00 1,178 22.33 0.4839
2019-02-05 2018-12-31 13F Thermo Fisher Scientific com 883556102 4,304 -1 -0.02 963 -8.37 0.4606
2018-11-10 2018-09-30 13F Thermo Fisher Scientific com 883556102 4,305 209 5.10 1,051 23.94 0.4645
2018-08-08 2018-06-30 13F Thermo Fisher Scientific com 883556102 4,096 -85 -2.03 848 -1.74 0.4140
2018-05-14 2018-03-31 13F Thermo Fisher Scientific com 883556102 4,181 0 0.00 863 8.69 0.4527
2018-02-06 2017-12-31 13F Thermo Fisher Scientific com 883556102 4,181 -205 -4.67 794 -4.34 0.4299
2017-11-13 2017-09-30 13F Thermo Fisher Scientific com 883556102 4,386 40 0.92 830 9.50 0.4645
2017-08-11 2017-06-30 13F Thermo Fisher Scientific com 883556102 4,346 -75 -1.70 758 11.63 0.4605
2017-05-09 2017-03-31 13F Thermo Fisher Scientific com 883556102 4,421 100 2.31 679 11.31 0.4508
2017-02-13 2016-12-31 13F Thermo Fisher Scntfc com 883556102 4,321 4,321 610 0.4883
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.