Thermo Fisher Scientific Inc.
MX ˙ BMV ˙ US8835561023
SecurityMX:TMO / Thermo Fisher Scientific Inc.
InstitutionFirst American Trust, Fsb
Latest Disclosed Ownership20,828 shares
Latest Disclosed Value $ 10,237,894
First American Trust, Fsb reports 0.63% decrease in ownership of TMO / Thermo Fisher Scientific Inc.

On May 12, 2026 - First American Trust, Fsb filed a 13F-HR form disclosing ownership of 20,828 shares of Thermo Fisher Scientific Inc. (MX:TMO) valued at $10,237,894 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 11, 2026 disclosing 20,960 shares of Thermo Fisher Scientific Inc.. This represents a change in shares of -0.63% 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)
2026-05-12 2026-03-31 13F THERMO FISHER SCIENTIFIC COMMON STOCK 883556102 20,828 -132 -0.63 10,238 -15.71 0.3619
2026-02-11 2025-12-31 13F THERMO FISHER SCIENTIFIC COMMON STOCK 883556102 20,960 -302 -1.42 12,146 17.78 0.8346
2025-11-10 2025-09-30 13F THERMO FISHER SCIENTIFIC COMMON STOCK 883556102 21,262 162 0.77 10,313 20.54 0.7488
2025-08-11 2025-06-30 13F THERMO FISHER SCIENTIFIC COMMON STOCK 883556102 21,100 -204 -0.96 8,556 -19.30 0.6830
2025-05-12 2025-03-31 13F THERMO FISHER SCIENTIFIC COMMON STOCK 883556102 21,304 5,149 31.87 10,601 26.14 0.9748
2025-02-11 2024-12-31 13F THERMO FISHER SCIENTIFIC COMMON STOCK 883556102 16,155 -6 -0.04 8,404 -15.93 0.8384
2024-11-12 2024-09-30 13F THERMO FISHER SCIENTIFIC COMMON STOCK 883556102 16,161 -2,227 -12.11 9,997 -1.69 0.9911
2024-08-12 2024-06-30 13F THERMO FISHER SCIENTIFIC COMMON STOCK 883556102 18,388 880 5.03 10,169 -0.07 1.0193
2024-05-13 2024-03-31 13F THERMO FISHER SCIENTIFIC COMMON STOCK 883556102 17,508 1,149 7.02 10,176 17.19 1.0667
2024-01-30 2023-12-31 13F THERMO FISHER SCIENTIFIC COMMON STOCK 883556102 16,359 -407 -2.43 8,684 2.32 1.0747
2023-10-31 2023-09-30 13F THERMO FISHER SCIENTIFIC COMMON STOCK 883556102 16,766 -135 -0.80 8,486 105,975.00 1.2010
2023-07-26 2023-06-30 13F THERMO FISHER SCIENTIFIC COMMON STOCK 883556102 16,901 766 4.75 9 -11.11 1.2148
2023-04-26 2023-03-31 13F THERMO FISHER SCIENTIFIC COMMON STOCK 883556102 16,135 3,688 29.63 9 50.00 1.3799
2023-01-25 2022-12-31 13F THERMO FISHER SCIENTIFIC COMMON STOCK 883556102 12,447 2,473 24.79 7 -99.88 1.0623
2022-10-18 2022-09-30 13F THERMO FISHER SCIENTIFIC COMMON STOCK 883556102 9,974 -135 -1.34 5,058 -7.90 0.8496
2022-07-19 2022-06-30 13F THERMO FISHER SCIENTIFIC COMMON STOCK 883556102 10,109 -172 -1.67 5,492 -9.57 0.8691
2022-04-12 2022-03-31 13F THERMO FISHER SCIENTIFIC COMMON STOCK 883556102 10,281 909 9.70 6,073 -2.88 0.7934
2022-01-11 2021-12-31 13F THERMO FISHER SCIENTIFIC COMMON STOCK 883556102 9,372 314 3.47 6,253 20.83 0.8538
2021-10-21 2021-09-30 13F THERMO FISHER SCIENTIFIC COMMON STOCK 883556102 9,058 355 4.08 5,175 17.85 0.7813
2021-07-29 2021-06-30 13F THERMO FISHER SCIENTIFIC COMMON STOCK 883556102 8,703 -348 -3.84 4,391 6.32 0.6896
2021-04-27 2021-03-31 13F THERMO FISHER SCIENTIFIC COMMON STOCK 883556102 9,051 -4 -0.04 4,130 -2.09 0.6519
2021-01-28 2020-12-31 13F THERMO FISHER SCIENTIFIC COMMON STOCK 883556102 9,055 -4,600 -33.69 4,218 -30.04 0.7028
2020-10-14 2020-09-30 13F THERMO FISHER SCIENTIFIC COMMON STOCK 883556102 13,655 82 0.60 6,029 22.59 1.0803
2020-07-08 2020-06-30 13F THERMO FISHER SCIENTIFIC COMMON STOCK 883556102 13,573 556 4.27 4,918 33.21 0.9645
2020-04-28 2020-03-31 13F THERMO FISHER SCIENTIFIC COMMON STOCK 883556102 13,017 184 1.43 3,692 -11.44 0.9019
2020-01-29 2019-12-31 13F THERMO FISHER SCIENTIFIC COMMON STOCK 883556102 12,833 70 0.55 4,169 12.16 0.7980
2019-10-10 2019-09-30 13F THERMO FISHER SCIENTIFIC COMMON STOCK 883556102 12,763 11 0.09 3,717 -0.75 0.7458
2019-07-08 2019-06-30 13F THERMO FISHER SCIENTIFIC COMMON STOCK 883556102 12,752 557 4.57 3,745 12.19 0.7789
2019-04-09 2019-03-31 13F THERMO FISHER SCIENTIFIC COMMON STOCK 883556102 12,195 301 2.53 3,338 25.44 0.7362
2019-01-11 2018-12-31 13F THERMO FISHER SCIENTIFIC COMMON STOCK 883556102 11,894 -338 -2.76 2,661 -10.88 0.6697
2018-10-02 2018-09-30 13F THERMO FISHER SCIENTIFIC COMMON STOCK 883556102 12,232 -5,266 -30.09 2,986 -17.60 0.6662
2018-07-06 2018-06-30 13F THERMO FISHER SCIENTIFIC COMMON STOCK 883556102 17,498 529 3.12 3,624 3.42 0.8522
2018-04-09 2018-03-31 13F THERMO FISHER SCIENTIFIC COMMON STOCK 883556102 16,969 -4 -0.02 3,504 8.72 0.8505
2018-01-10 2017-12-31 13F THERMO FISHER SCIENTIFIC COMMON STOCK 883556102 16,973 387 2.33 3,223 2.71 0.7932
2017-10-06 2017-09-30 13F THERMO FISHER SCIENTIFIC COMMON STOCK 883556102 16,586 573 3.58 3,138 12.31 0.8196
2017-07-06 2017-06-30 13F THERMO FISHER SCIENTIFIC COMMON STOCK 883556102 16,013 5,482 52.06 2,794 72.68 0.7774
2017-04-05 2017-03-31 13F THERMO FISHER SCIENTIFIC COMMON STOCK 883556102 10,531 -547 -4.94 1,618 3.52 0.4935
2017-01-04 2016-12-31 13F THERMO FISHER SCIENTIFIC COMMON STOCK 883556102 11,078 -520 -4.48 1,563 -15.28 0.4833
2016-10-05 2016-09-30 13F THERMO FISHER SCIENTIFIC COMMON STOCK 883556102 11,598 -6,910 -37.34 1,845 -32.54 0.5760
2016-07-06 2016-06-30 13F THERMO FISHER SCIENTIFIC COMMON STOCK 883556102 18,508 -1,019 -5.22 2,735 -1.08 0.9652
2016-04-05 2016-03-31 13F THERMO FISHER SCIENTIFIC COMMON STOCK 883556102 19,527 290 1.51 2,765 1.36 0.9692
2016-01-07 2015-12-31 13F THERMO FISHER SCIENTIFIC COMMON STOCK 883556102 19,237 -282 -1.44 2,728 14.29 1.0053
2015-10-13 2015-09-30 13F THERMO FISHER SCIENTIFIC COMMON STOCK 883556102 19,519 80 0.41 2,387 -5.35 0.9218
2015-07-02 2015-06-30 13F THERMO FISHER SCIENTIFIC COMMON STOCK 883556102 19,439 -695 -3.45 2,522 -6.73 0.9336
2015-05-11 2015-03-31 13F THERMO FISHER SCIENTIFIC COMMON STOCK 883556102 20,134 -361 -1.76 2,704 5.30 0.9637
2015-01-07 2014-12-31 13F THERMO FISHER SCIENTIFIC COMMON STOCK 883556102 20,495 -10,504 -33.88 2,568 -31.94 0.9506
2014-10-03 2014-09-30 13F THERMO FISHER SCIENTIFIC COMMON STOCK 883556102 30,999 -75 -0.24 3,773 2.89 1.4004
2014-07-09 2014-06-30 13F THERMO FISHER SCIENTIFIC COMMON STOCK 883556102 31,074 174 0.56 3,667 -1.29 1.3935
2014-05-08 2014-03-31 13F THERMO FISHER SCIENTIFIC COMMON STOCK 883556102 30,900 5,770 22.96 3,715 32.77 1.3874
2014-02-07 2013-12-31 13F THERMO FISHER SCIENTIFIC COMMON STOCK 883556102 25,130 -520 -2.03 2,798 18.36 0.9447
2013-11-07 2013-09-30 13F THERMO FISHER SCIENTIFIC COMMON STOCK 883556102 25,650 -1,296 -4.81 2,364 3.68 0.8502
2013-07-10 2013-06-30 13F THERMO FISHER SCIENTIFIC COMMON STOCK 883556102 26,946 26,946 2,280 0.8557
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.