Thermo Fisher Scientific Inc.
MX ˙ BMV ˙ US8835561023
SecurityMX:TMO / Thermo Fisher Scientific Inc.
InstitutionSumitomo Mitsui Trust Holdings, Inc.
Latest Disclosed Ownership1,078,539 shares
Latest Disclosed Value $ 530,134,275
Sumitomo Mitsui Trust Holdings, Inc. reports 1.48% decrease in ownership of TMO / Thermo Fisher Scientific Inc.

On April 30, 2026 - Sumitomo Mitsui Trust Holdings, Inc. filed a 13F-HR form disclosing ownership of 1,078,539 shares of Thermo Fisher Scientific Inc. (MX:TMO) valued at $530,134,275 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 23, 2026 disclosing 1,094,733 shares of Thermo Fisher Scientific Inc.. This represents a change in shares of -1.48% 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)
2026-04-30 2026-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,078,539 -16,194 -1.48 530,134 -16.43 0.3432
2026-01-23 2025-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,094,733 -35,021 -3.10 634,343 15.77 0.3725
2025-10-27 2025-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 1,129,754 5,892 0.52 547,953 20.25 0.3153
2025-07-31 2025-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 1,123,862 5,483 0.49 455,681 -18.12 0.2839
2025-04-25 2025-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,118,379 -638 -0.06 556,505 -4.40 0.3934
2025-01-28 2024-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,119,017 14,576 1.32 582,146 -14.79 0.3929
2024-11-05 2024-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 1,104,441 18,160 1.67 683,174 13.73 0.4735
2024-07-19 2024-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 1,086,281 -73,418 -6.33 600,713 -10.88 0.4434
2024-04-19 2024-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,159,699 -8,484 -0.73 674,029 8.70 0.4627
2024-01-30 2023-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,168,183 -9,061 -0.77 620,060 4.06 0.4584
2023-10-30 2023-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 1,177,244 -24,517 -2.04 595,886 -4.97 0.4892
2023-07-31 2023-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 1,201,761 -217,664 -15.33 627,019 -23.36 0.4884
2023-04-27 2023-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,419,425 33,124 2.39 818,114 7.16 0.6095
2023-01-30 2022-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,386,301 -8,615 -0.62 763,422 7.91 0.6044
2022-10-21 2022-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 1,394,916 -1,034 -0.07 707,487 -6.71 0.5813
2022-07-26 2022-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 1,395,950 48,974 3.64 758,392 -4.68 0.5833
2022-04-27 2022-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,346,976 -1,950 -0.14 795,591 -11.61 0.5298
2022-02-02 2021-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,348,926 -51,752 -3.69 900,057 12.47 0.5472
2021-10-25 2021-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 1,400,678 -81,874 -5.52 800,249 7.00 0.4984
2021-08-02 2021-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 1,482,552 -179,151 -10.78 747,903 -1.38 0.4422
2021-04-30 2021-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,661,703 28,876 1.77 758,368 -0.29 0.4739
2021-02-05 2020-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,632,827 -197,749 -10.80 760,538 -5.90 0.4913
2020-10-30 2020-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 1,830,576 -130,774 -6.67 808,236 13.73 0.5444
2020-07-27 2020-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 1,961,350 -255,923 -11.54 710,676 13.02 0.5019
2020-04-27 2020-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 2,217,273 519,525 30.60 628,819 14.01 0.5407
2020-01-31 2019-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,697,748 13,801 0.82 551,547 12.45 0.4335
2019-10-31 2019-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 1,683,947 10,168 0.61 490,483 -0.22 0.4261
2019-07-29 2019-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 1,673,779 104,884 6.69 491,555 14.46 0.4388
2019-05-08 2019-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,568,895 60,869 4.04 429,438 28.01 0.3972
2019-02-06 2018-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,508,026 240,710 18.99 335,460 8.45 0.3607
2018-11-07 2018-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 1,267,316 24,941 2.01 309,326 20.20 0.3325
2018-08-01 2018-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 1,242,375 78,342 6.73 257,346 7.08 0.2999
2018-05-01 2018-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,164,033 34,168 3.02 240,326 12.02 0.3091
2018-02-06 2017-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,129,865 37,053 3.39 214,539 3.76 0.2769
2017-11-07 2017-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 1,092,812 -21,485 -1.93 206,760 6.35 0.2918
2017-08-07 2017-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 1,114,297 5,725 0.52 194,411 14.17 0.2852
2017-05-02 2017-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,108,572 -5,906 -0.53 170,277 8.28 0.2631
2017-01-27 2016-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,114,478 -19,706 -1.74 157,253 -12.83 0.2566
2016-10-28 2016-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 1,134,184 22,203 2.00 180,403 9.80 0.2959
2016-07-29 2016-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 1,111,981 5,533 0.50 164,306 4.88 0.2830
2016-05-06 2016-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,106,448 4,875 0.44 156,662 -0.45 0.2740
2016-02-09 2015-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,101,573 18,883 1.74 157,371 18.87 0.2813
2015-11-06 2015-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 1,082,690 -66,735 -5.81 132,391 -11.24 0.2563
2015-07-31 2015-06-30 13F Thermo Fisher Scientific COM 883556102 1,149,425 -21,955 -1.87 149,149 -5.22 0.2680
2015-05-08 2015-03-31 13F Thermo Fisher Scientific COM 883556102 1,171,380 1,171,380 0.00 157,363 0.2840
2015-02-04 2014-12-31 13F Thermo Fisher Scientific COM 883556102 0 -1,093,167 -100.00 0 -100.00
2014-11-07 2014-09-30 13F Thermo Fisher Scientific COM 883556102 1,093,167 18,651 1.74 133,038 4.93 0.2667
2014-08-11 2014-06-30 13F Thermo Fisher Scientific COM 883556102 1,074,516 12,241 1.15 126,793 -0.73 0.2603
2014-05-09 2014-03-31 13F Thermo Fisher Scientific COM 883556102 1,062,275 156,281 17.25 127,728 27.48 0.2688
2014-02-14 2013-12-31 13F Thermo Fisher Scientific COM 883556102 905,994 -41,773 -4.41 100,194 14.72 0.2080
2013-11-07 2013-09-30 13F Thermo Fisher Scientific COM 883556102 947,767 -165,711 -14.88 87,337 -7.32 0.1888
2013-08-12 2013-06-30 13F Thermo Fisher Scientific COM 883556102 1,113,478 1,113,478 94,234 0.2139
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.