Thermo Fisher Scientific Inc.
MX ˙ BMV ˙ US8835561023
SecurityMX:TMO / Thermo Fisher Scientific Inc.
InstitutionDimensional Fund Advisors Lp
Latest Disclosed Ownership1,689,790 shares
Latest Disclosed Value $ 830,485,979
Dimensional Fund Advisors Lp reports 2.19% increase in ownership of TMO / Thermo Fisher Scientific Inc.

On May 7, 2026 - Dimensional Fund Advisors Lp filed a 13F-HR form disclosing ownership of 1,689,790 shares of Thermo Fisher Scientific Inc. (MX:TMO) valued at $830,485,979 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 1,653,504 shares of Thermo Fisher Scientific Inc.. This represents a change in shares of 2.19% 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)
2026-05-07 2026-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,689,790 36,286 2.19 830,486 -13.32 0.1725
2026-02-12 2025-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,653,504 -14,243 -0.85 958,158 18.49 0.2010
2025-11-12 2025-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 1,667,747 -24,687 -1.46 808,643 17.83 0.1735
2025-08-12 2025-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 1,692,434 -37,248 -2.15 686,261 -20.27 0.1589
2025-05-13 2025-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,729,682 -170,141 -8.96 860,695 -12.92 0.2139
2025-02-13 2024-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,899,823 192,179 11.25 988,346 -6.43 0.2374
2024-11-07 2024-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 1,707,644 -32,838 -1.89 1,056,265 9.74 0.2562
2024-08-09 2024-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 1,740,482 20,075 1.17 962,482 -3.74 0.2514
2024-05-10 2024-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,720,407 10,241 0.60 999,918 10.15 0.2707
2024-02-07 2023-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,710,166 -989 -0.06 907,756 4.81 0.2651
2023-11-09 2023-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 1,711,155 -203,807 -10.64 866,133 -13.31 0.2841
2023-08-09 2023-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 1,914,962 -81,547 -4.08 999,098 -13.17 0.3184
2023-05-12 2023-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,996,509 -171,563 -7.91 1,150,644 96,349.54 0.3876
2023-02-09 2022-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 2,168,072 -55,798 -2.51 1,194 -99.89 0.3528
2022-11-10 2022-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 2,223,870 -12,824 -0.57 1,128,005 -7.16 0.4331
2022-08-12 2022-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 2,236,694 -103,850 -4.44 1,215,058 -12.11 0.4358
2022-05-13 2022-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 2,340,544 4,559 0.20 1,382,477 -11.30 0.4259
2022-02-09 2021-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 2,335,985 -8,105 -0.35 1,558,644 16.37 0.4712
2021-11-12 2021-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 2,344,090 41,023 1.78 1,339,329 15.28 0.4314
2021-08-12 2021-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 2,303,067 95,570 4.33 1,161,852 15.33 0.3679
2021-05-14 2021-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 2,207,497 -60,933 -2.69 1,007,422 -4.65 0.3332
2021-03-08 2020-12-31 13F/A-2 THERMO FISHER SCIENTIFIC COM 883556102 2,268,430 -176,739 -7.23 1,056,562 -2.13 0.3815
2021-02-11 2020-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 2,268,430 -176,739 1,056,562 381,574.0351
2020-11-12 2020-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 2,445,169 -37,846 -1.52 1,079,518 20.00 0.4578
2020-08-13 2020-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 2,483,015 -10,353 -0.42 899,593 27.22 0.3954
2020-05-14 2020-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 2,493,368 -46,052 -1.81 707,125 -14.29 0.3684
2020-02-14 2019-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 2,539,420 -15,645 -0.61 824,984 10.86 0.3007
2019-11-12 2019-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 2,555,065 -79,176 -3.01 744,178 -3.81 0.2892
2019-08-13 2019-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 2,634,241 -67,814 -2.51 773,636 4.61 0.3004
2019-08-12 2019-03-31 13F/A-2 THERMO FISHER SCIENTIFIC COM 883556102 2,702,055 -4,271 -0.16 739,567 22.11 0.2946
2019-05-10 2019-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 2,702,055 -4,271 739,567
2019-02-26 2018-12-31 13F/A-1 THERMO FISHER SCIENTIFIC COM 883556102 2,706,326 17,860 0.66 605,651 -7.70 0.2744
2019-02-13 2018-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 2,706,326 17,860 605,651
2018-11-13 2018-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 2,688,466 17,505 0.66 656,201 18.61 0.2498
2018-08-10 2018-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 2,670,961 82,255 3.18 553,246 3.52 0.2206
2018-05-11 2018-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 2,588,706 -138,886 -5.09 534,457 3.19 0.2227
2018-02-12 2017-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 2,727,592 -79,324 -2.83 517,939 -2.47 0.2147
2017-11-13 2017-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 2,806,916 -19,098 -0.68 531,030 7.70 0.2321
2017-08-11 2017-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 2,826,014 -9,446 -0.33 493,051 13.21 0.2276
2017-05-12 2017-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 2,835,460 57,480 2.07 435,527 11.11 0.2082
2017-02-09 2016-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 2,777,980 36,898 1.35 391,983 -10.09 0.1958
2016-11-10 2016-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 2,741,082 -3,386 -0.12 435,952 7.51 0.2356
2016-08-09 2016-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 2,744,468 33,035 1.22 405,488 5.62 0.2333
2016-05-13 2016-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 2,711,433 -50,884 -1.84 383,900 -2.03 0.2298
2016-02-10 2015-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 2,762,317 -156,440 -5.36 391,849 9.80 0.2442
2015-11-13 2015-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 2,918,757 22,496 0.78 356,889 -5.04 0.2343
2015-08-14 2015-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 2,896,261 58,073 2.05 375,827 -1.43 0.2301
2015-05-14 2015-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 2,838,188 -66,688 -2.30 381,287 4.75 0.2408
2015-02-06 2014-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 2,904,876 -152,161 -4.98 363,981 -2.17 0.2391
2014-11-13 2014-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 3,057,037 -427,429 -12.27 372,053 -9.51 0.2636
2014-08-08 2014-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 3,484,466 -15,894 -0.45 411,169 -2.30 0.2858
2014-05-14 2014-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 3,500,360 2,171 0.06 420,827 8.04 0.3144
2014-02-12 2013-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 3,498,189 -14,334 -0.41 389,505 20.33 0.3035
2013-11-13 2013-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 3,512,523 18,133 0.52 323,686 9.45 0.2801
2013-08-15 2013-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 3,494,390 3,494,390 295,750 0.2785
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.