Thermo Fisher Scientific Inc.
MX ˙ BMV ˙ US8835561023
SecurityMX:TMO / Thermo Fisher Scientific Inc.
InstitutionPrincipal Financial Group Inc
Latest Disclosed Ownership624,721 shares
Latest Disclosed Value $ 307,069,272
Principal Financial Group Inc reports 2.63% decrease in ownership of TMO / Thermo Fisher Scientific Inc.

On May 4, 2026 - Principal Financial Group Inc filed a 13F-HR form disclosing ownership of 624,721 shares of Thermo Fisher Scientific Inc. (MX:TMO) valued at $307,069,272 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 2, 2026 disclosing 641,610 shares of Thermo Fisher Scientific Inc.. This represents a change in shares of -2.63% 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)
2026-05-04 2026-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 624,721 -16,889 -2.63 307,069 -17.41 0.0837
2026-02-02 2025-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 641,610 70,109 12.27 371,781 34.13 0.1898
2025-11-04 2025-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 571,501 -626,401 -52.29 277,189 -42.93 0.1398
2025-08-08 2025-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 1,197,902 -31,076 -2.53 485,708 -20.58 0.2567
2025-04-28 2025-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,228,978 12,063 0.99 611,540 -3.40 0.3432
2025-01-31 2024-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,216,915 -30,923 -2.48 633,076 -17.98 0.3451
2024-10-31 2024-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 1,247,838 225,568 22.07 771,876 36.54 0.4252
2024-07-29 2024-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 1,022,270 247,110 31.88 565,316 25.48 0.3357
2024-04-29 2024-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 775,160 166,547 27.37 450,531 39.46 0.2648
2024-02-07 2023-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 608,613 -10,563 -1.71 323,046 3.07 0.2060
2023-11-02 2023-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 619,176 2,067 0.33 313,408 -2.66 0.2252
2023-08-07 2023-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 617,109 -11,128 -1.77 321,977 -11.08 0.2200
2023-05-09 2023-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 628,237 32,303 5.42 362,097 10.34 0.2589
2023-02-09 2022-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 595,934 -17,409 -2.84 328,175 5.49 0.2471
2022-11-09 2022-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 613,343 -21,413 -3.37 311,081 -9.79 0.2472
2022-08-10 2022-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 634,756 -15,245 -2.35 344,850 -10.18 0.2552
2022-05-09 2022-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 650,001 -12,509 -1.89 383,923 -13.15 0.1524
2022-05-09 2022-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 637,951 376,806
2022-02-09 2021-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 662,510 -32,518 -4.68 442,053 11.32 0.2639
2021-11-09 2021-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 695,028 15,220 2.24 397,091 15.79 0.2590
2021-08-10 2021-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 679,808 6,576 0.98 342,943 11.62 0.2216
2021-05-10 2021-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 673,232 -32,842 -4.65 307,249 -6.58 0.2168
2021-02-23 2020-12-31 13F/A-1 THERMO FISHER SCIENTIFIC COM 883556102 706,074 -74,646 -9.56 328,875 -4.59 0.2436
2021-02-08 2020-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 706,074 -74,646 328,875 225,506.0443
2020-11-06 2020-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 780,720 -49,078 -5.91 344,703 14.65 0.2901
2020-08-05 2020-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 829,798 30,433 3.81 300,668 32.63 0.2666
2020-05-12 2020-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 799,365 -19,641 -2.40 226,700 -14.80 0.2509
2020-02-05 2019-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 819,006 48,648 6.31 266,070 18.58 0.2217
2019-11-13 2019-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 770,358 51,008 7.09 224,382 6.21 0.1978
2019-08-12 2019-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 719,350 51,518 7.71 211,259 15.57 0.1900
2019-05-10 2019-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 667,832 -17,579 -2.56 182,799 19.17 0.1703
2019-02-14 2018-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 685,411 -9,652 -1.39 153,388 -9.59 0.1635
2018-11-14 2018-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 695,063 6,250 0.91 169,651 18.90 0.1495
2018-08-13 2018-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 688,813 -6,499 -0.93 142,681 -0.61 0.1311
2018-05-14 2018-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 695,312 -24,207 -3.36 143,553 5.07 0.1380
2018-02-12 2017-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 719,519 -87,326 -10.82 136,622 -10.50 0.1258
2017-11-02 2017-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 806,845 229 0.03 152,656 8.47 0.1480
2017-08-08 2017-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 806,616 245,662 43.79 140,730 63.33 0.1410
2017-05-11 2017-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 560,954 -8,202 -1.44 86,163 7.29 0.1037
2017-02-13 2016-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 569,156 -8,907 -1.54 80,308 -12.66 0.1019
2016-11-10 2016-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 578,063 11,392 2.01 91,946 9.81 0.1214
2016-08-09 2016-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 566,671 29,782 5.55 83,731 10.15 0.1168
2016-05-10 2016-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 536,889 2,294 0.43 76,018 0.25 0.1104
2016-02-09 2015-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 534,595 12,627 2.42 75,832 18.81 0.1127
2015-11-12 2015-09-30 13F/A-1 THERMO FISHER SCIENTIFIC COM 883556102 521,968 5,698 1.10 63,826 -4.73 0.1003
2015-11-09 2015-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 521,968 63,826
2015-08-10 2015-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 516,270 7,978 1.57 66,992 -1.89 0.0999
2015-05-14 2015-03-31 13F/A-1 THERMO FISHER SCIENTIFIC COM 883556102 508,292 12,533 2.53 68,283 9.93 0.1017
2015-05-12 2015-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 508,292 68,283
2015-02-12 2014-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 495,759 19,097 4.01 62,114 7.07 0.0965
2014-11-13 2014-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 476,662 -369,196 -43.65 58,010 -41.88 0.0984
2014-08-12 2014-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 845,858 356,391 72.81 99,812 69.60 0.1678
2014-05-13 2014-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 489,467 90,025 22.54 58,853 32.32 0.1050
2014-02-12 2013-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 399,442 1,729 0.43 44,478 21.36 0.0830
2013-11-05 2013-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 397,713 -10,629 -2.60 36,649 6.05 0.0757
2013-08-12 2013-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 408,342 408,342 34,558 0.0765
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.