Thermo Fisher Scientific Inc.
MX ˙ BMV ˙ US8835561023
SecurityMX:TMO / Thermo Fisher Scientific Inc.
InstitutionCHICAGO TRUST Co NA
Latest Disclosed Ownership1,616 shares
Latest Disclosed Value $ 794,312
CHICAGO TRUST Co NA reports 15.04% decrease in ownership of TMO / Thermo Fisher Scientific Inc.

On April 24, 2026 - CHICAGO TRUST Co NA filed a 13F-HR form disclosing ownership of 1,616 shares of Thermo Fisher Scientific Inc. (MX:TMO) valued at $794,312 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 1,902 shares of Thermo Fisher Scientific Inc.. This represents a change in shares of -15.04% 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)
2026-04-24 2026-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,616 -286 -15.04 794 -27.95 0.0792
2026-02-17 2025-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 0 -100.00 0
2026-02-17 2025-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,902 45 2.42 1,102 22.44 0.1092
2025-10-10 2025-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 1,857 -59 -3.08 901 15.98 0.1250
2025-07-14 2025-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 1,916 655 51.94 777 23.76 0.1092
2025-04-14 2025-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,261 -299 -19.17 627 -22.69 0.1113
2025-01-13 2024-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,560 -161 -9.36 812 -23.78 0.1436
2024-10-10 2024-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 1,721 64 3.86 1,065 16.16 0.1836
2024-07-11 2024-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 1,657 -86 -4.93 916 -9.58 0.1859
2024-04-12 2024-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,743 -197 -10.15 1,013 -1.55 0.2096
2024-01-16 2023-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,940 -279 -12.57 1,030 -8.37 0.2289
2023-10-27 2023-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 2,219 -207 -8.53 1,123 -11.23 0.2821
2023-07-19 2023-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 2,426 -56 -2.26 1,266 -11.54 0.3035
2023-04-11 2023-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 2,482 -35 -1.39 1,431 142,900.00 0.3590
2023-01-12 2022-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 2,517 -263 -9.46 1 -99.93 0.3458
2022-10-13 2022-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 2,780 -65 -2.28 1,410 -8.80 0.3657
2022-08-03 2022-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 2,845 -1,035 -26.68 1,546 -32.52 0.3896
2022-04-12 2022-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 3,880 -137 -3.41 2,291 -14.55 0.3621
2022-01-18 2021-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 4,017 -200 -4.74 2,681 11.24 0.5337
2021-10-13 2021-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 4,217 380 9.90 2,410 24.48 0.5293
2021-07-21 2021-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 3,837 1,253 48.49 1,936 64.21 0.4581
2021-04-12 2021-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 2,584 -530 -17.02 1,179 -18.75 0.4049
2021-01-28 2020-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 3,114 57 1.86 1,451 7.48 0.4987
2020-10-08 2020-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 3,057 100 3.38 1,350 26.05 0.5629
2020-07-13 2020-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 2,957 197 7.14 1,071 36.96 0.4739
2020-04-07 2020-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 2,760 -316 -10.27 782 -21.80 0.3955
2020-01-13 2019-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 3,076 0 0.00 1,000 11.61 0.4068
2019-10-09 2019-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 3,076 0 0.00 896 -0.88 0.3781
2019-07-23 2019-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 3,076 200 6.95 904 14.87 0.3852
2019-04-10 2019-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 2,876 0 0.00 787 22.20 0.3392
2019-01-09 2018-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 2,876 -20 -0.69 644 -8.91 0.3052
2018-10-10 2018-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 2,896 -50 -1.70 707 15.90 0.2816
2018-07-12 2018-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 2,946 -1 -0.03 610 0.16 0.2596
2018-05-10 2018-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 2,947 -886 -23.12 609 -16.35 0.2601
2018-01-17 2017-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 3,833 -19 -0.49 728 -0.14 0.2909
2017-10-16 2017-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 3,852 0 0.00 729 8.48 0.3074
2017-07-12 2017-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 3,852 0 0.00 672 13.71 0.2985
2017-04-17 2017-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 3,852 -2,425 -38.63 591 -33.30 0.2614
2017-01-18 2016-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 6,277 -1,350 -17.70 886 -26.96 0.3844
2016-10-12 2016-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 7,627 -150 -1.93 1,213 5.57 0.5292
2016-07-08 2016-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 7,777 -20 -0.26 1,149 4.08 0.4721
2016-04-08 2016-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 7,797 -475 -5.74 1,104 -5.96 0.4581
2016-01-08 2015-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 8,272 0 0.00 1,174 16.12 0.4554
2015-10-14 2015-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 8,272 0 0.00 1,011 -5.78 0.3882
2015-07-07 2015-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 8,272 0 0.00 1,073 -3.42 0.3775
2015-04-16 2015-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 8,272 8,272 1,111 0.3807
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.