Thermo Fisher Scientific Inc.
MX ˙ BMV ˙ US8835561023
SecurityMX:TMO / Thermo Fisher Scientific Inc.
InstitutionCongress Asset Management Co /ma
Latest Disclosed Ownership200,288 shares
Latest Disclosed Value $ 98,447,804
Congress Asset Management Co /ma reports 4.16% decrease in ownership of TMO / Thermo Fisher Scientific Inc.

On April 14, 2026 - Congress Asset Management Co /ma filed a 13F-HR form disclosing ownership of 200,288 shares of Thermo Fisher Scientific Inc. (MX:TMO) valued at $98,447,804 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 9, 2026 disclosing 208,978 shares of Thermo Fisher Scientific Inc.. This represents a change in shares of -4.16% 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)
2026-04-14 2026-03-31 13F Thermo Fisher Scientific COM 883556102 200,288 -8,690 -4.16 98,448 -18.70 0.7056
2026-01-09 2025-12-31 13F Thermo Fisher Scientific COM 883556102 208,978 59,093 39.43 121,092 66.57 0.8523
2025-10-10 2025-09-30 13F Thermo Fisher Scientific COM 883556102 149,885 -12,613 -7.76 72,697 10.34 0.4838
2025-07-16 2025-06-30 13F Thermo Fisher Scientific COM 883556102 162,498 -5,251 -3.13 65,887 -21.07 0.4519
2025-04-11 2025-03-31 13F Thermo Fisher Scientific Inc C COM 883556102 167,749 31,894 23.48 83,472 18.11 0.6244
2025-01-30 2024-12-31 13F Thermo Fisher Scientific Inc C COM 883556102 135,855 -41,837 -23.54 70,676 -35.70 0.4777
2024-10-28 2024-09-30 13F Thermo Fisher Scientific Inc C COM 883556102 177,692 156,631 743.70 109,915 843.80 0.7494
2024-08-02 2024-06-30 13F Thermo Fisher Scientific Inc C COM 883556102 21,061 -189 -0.89 11,647 -5.70 0.0835
2024-04-11 2024-03-31 13F Thermo Fisher Scientific Inc C COM 883556102 21,250 1,155 5.75 12,351 15.79 0.0881
2024-03-04 2023-12-31 13F Thermo Fisher Scientific Inc C COM 883556102 20,095 3,343 19.96 10,666 25.79 0.0840
2023-11-01 2023-09-30 13F Thermo Fisher Scientific COM 883556102 16,752 973 6.17 8,479 3.00 0.0750
2023-07-27 2023-06-30 13F Thermo Fisher Scientific COM 883556102 15,779 -1,294 -7.58 8,233 -16.34 0.0715
2023-04-21 2023-03-31 13F Thermo Fisher Scientific COM 883556102 17,073 1,072 6.70 9,840 11.68 0.0917
2023-01-18 2022-12-31 13F Thermo Fisher Scientific COM 883556102 16,001 9,848 160.05 8,812 182.31 0.0884
2022-11-08 2022-09-30 13F Thermo Fisher Scientific COM 883556102 6,153 -883 -12.55 3,121 -18.36 0.0335
2022-08-02 2022-06-30 13F Thermo Fisher Scientific COM 883556102 7,036 -1,049 -12.97 3,823 -19.95 0.0366
2022-04-20 2022-03-31 13F Thermo Fisher Scientific COM 883556102 8,085 -188,206 -95.88 4,776 -96.35 0.0406
2022-01-28 2021-12-31 13F Thermo Fisher Scientific COM 883556102 196,291 -41,581 -17.48 130,973 -3.63 0.9973
2021-11-08 2021-09-30 13F Thermo Fisher Scientific COM 883556102 237,872 17,389 7.89 135,903 22.19 1.0607
2021-08-05 2021-06-30 13F Thermo Fisher Scientific COM 883556102 220,483 2,184 1.00 111,227 11.64 0.9303
2021-05-05 2021-03-31 13F Thermo Fisher Scientific COM 883556102 218,299 -884 -0.40 99,628 -2.41 0.8997
2021-01-26 2020-12-31 13F Thermo Fisher Scientific COM 883556102 219,183 -6,565 -2.91 102,091 2.43 0.9616
2020-11-03 2020-09-30 13F Thermo Fisher Scientific COM 883556102 225,748 -3,875 -1.69 99,672 19.80 1.0792
2020-07-23 2020-06-30 13F Thermo Fisher Scientific COM 883556102 229,623 1,335 0.58 83,202 28.51 0.9888
2020-04-21 2020-03-31 13F Thermo Fisher Scientific COM 883556102 228,288 -4,553 -1.96 64,742 -14.41 0.9861
2020-02-10 2019-12-31 13F Thermo Fisher Scientific COM 883556102 232,841 -6,235 -2.61 75,643 8.63 0.9210
2019-11-01 2019-09-30 13F Thermo Fisher Scientific COM 883556102 239,076 -4,150 -1.71 69,636 -2.51 0.8965
2019-08-07 2019-06-30 13F Thermo Fisher Scientific COM 883556102 243,226 -2,040 -0.83 71,431 6.40 0.9065
2019-05-08 2019-03-31 13F Thermo Fisher Scientific COM 883556102 245,266 -8,005 -3.16 67,134 18.44 0.8781
2019-01-25 2018-12-31 13F Thermo Fisher Scientific COM 883556102 253,271 -3,032 -1.18 56,680 -9.40 0.8523
2018-10-26 2018-09-30 13F Thermo Fisher Scientific COM 883556102 256,303 2,909 1.15 62,558 19.19 0.8092
2018-07-25 2018-06-30 13F Thermo Fisher Scientific COM 883556102 253,394 -4,548 -1.76 52,488 -1.44 0.7225
2018-05-11 2018-03-31 13F Thermo Fisher Scientific COM 883556102 257,942 -10,577 -3.94 53,255 4.45 0.7491
2018-01-30 2017-12-31 13F Thermo Fisher Scientific COM 883556102 268,519 -5,603 -2.04 50,986 -1.69 0.7425
2017-10-17 2017-09-30 13F Thermo Fisher Scientific COM 883556102 274,122 -8,620 -3.05 51,864 5.14 0.8018
2017-07-26 2017-06-30 13F Thermo Fisher Scientific COM 883556102 282,742 -10,993 -3.74 49,330 9.34 0.8826
2017-05-09 2017-03-31 13F Thermo Fisher Scientific COM 883556102 293,735 -10,141 -3.34 45,118 5.23 0.8624
2017-02-14 2016-12-31 13F Thermo Fisher Scientific COM 883556102 303,876 -21,546 -6.62 42,877 -17.17 0.8987
2016-11-14 2016-09-30 13F Thermo Fisher Scientific COM 883556102 325,422 -10,122 -3.02 51,762 4.40 1.1417
2016-08-04 2016-06-30 13F Thermo Fisher Scientific COM 883556102 335,544 -6,175 -1.81 49,580 2.47 1.1449
2016-05-09 2016-03-31 13F Thermo Fisher Scientific COM 883556102 341,719 450 0.13 48,384 -0.05 1.1716
2016-01-26 2015-12-31 13F Thermo Fisher Scientific COM 883556102 341,269 341,269 0.00 48,409 1.2022
2015-11-16 2015-09-30 13F Thermo Fisher Scientific COM 883556102 0 -1,602 -100.00 0 -100.00
2015-08-14 2015-06-30 13F Thermo Fisher Scientific COM 883556102 1,602 -402 -20.06 208 -22.68 0.0060
2015-05-12 2015-03-31 13F Thermo Fisher Scientific COM 883556102 2,004 2,004 0.00 269 0.0065
2015-02-05 2014-12-31 13F Thermo Fisher Scientific COM 883556102 0 -2,000 -100.00 0 -100.00
2014-11-12 2014-09-30 13F Thermo Fisher Scientific COM 883556102 2,000 0 0.00 243 2.97 0.0062
2014-08-12 2014-06-30 13F Thermo Fisher Scientific COM 883556102 2,000 0 0.00 236 -1.67 0.0060
2014-05-14 2014-03-31 13F Thermo Fisher Scientific COM 883556102 2,000 0 0.00 240 7.62 0.0060
2014-02-14 2013-12-31 13F Thermo Fisher Scientific COM 883556102 2,000 2,000 223 0.0058
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.