Thermo Fisher Scientific Inc.
MX ˙ BMV ˙ US8835561023
SecurityMX:TMO / Thermo Fisher Scientific Inc.
InstitutionNational Pension Service
Latest Disclosed Ownership829,652 shares
Latest Disclosed Value $ 407,798,848
National Pension Service reports 2.12% increase in ownership of TMO / Thermo Fisher Scientific Inc.

On May 12, 2026 - National Pension Service filed a 13F-HR form disclosing ownership of 829,652 shares of Thermo Fisher Scientific Inc. (MX:TMO) valued at $407,798,848 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 10, 2026 disclosing 812,432 shares of Thermo Fisher Scientific Inc.. This represents a change in shares of 2.12% 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)
2026-05-12 2026-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 829,652 17,220 2.12 407,799 -13.38 0.3097
2026-02-10 2025-12-31 13F THERMO FISHER SCIENTIFIC INC COM THERMO FISHER SCIENTIFIC INC COM 883556102 812,432 -4,909 -0.60 470,764 18.75 0.3485
2025-11-04 2025-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 817,341 20,039 2.51 396,427 22.63 0.3079
2025-08-08 2025-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 797,302 1,148 0.14 323,274 -18.40 0.2791
2025-05-13 2025-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 796,154 51,175 6.87 396,166 2.22 0.3808
2025-02-05 2024-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 744,979 42,450 6.04 387,560 -10.82 0.3668
2024-10-30 2024-09-30 13F THERMOFISHERSCIENTIFICINC COM 883556102 702,529 88,208 14.36 434,563 27.92 0.4191
2024-08-13 2024-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 614,321 8,783 1.45 339,720 -3.47 0.3903
2024-05-14 2024-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 605,538 8,423 1.41 351,945 11.04 0.4223
2024-02-07 2023-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 597,115 10,807 1.84 316,943 7.77 0.4414
2023-11-15 2023-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 586,308 11,426 1.99 294,086 -0.55 0.4706
2023-08-16 2023-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 574,882 19,411 3.49 295,714 -5.44 0.4770
2023-05-12 2023-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 555,471 -31,694 -5.40 312,714 -3.29 0.5694
2023-02-24 2022-12-31 13F/A-1 THERMO FISHER SCIENTIFIC COM 883556102 587,165 14,167 2.47 323,346 9.23 0.6360
2023-02-21 2022-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 587,165 14,167 323 0.6360
2023-02-24 2022-09-30 13F/A-1 THERMO FISHER SCIENTIFIC COM 883556102 572,998 11,979 2.14 296,016 -2.88 0.6177
2022-11-18 2022-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 572,998 11,979 296,016 0.6177
2022-08-17 2022-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 561,019 44,997 8.72 304,790 0.00 0.6282
2022-05-13 2022-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 516,022 31,594 6.52 304,788 -5.71 0.5564
2022-02-15 2021-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 484,428 -14,471 -2.90 323,230 13.40 0.5639
2021-11-18 2021-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 498,899 -4,207 -0.84 285,036 12.31 0.5428
2021-08-17 2021-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 503,106 6,741 1.36 253,802 12.04 0.4821
2021-05-14 2021-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 496,365 19,295 4.04 226,531 1.94 0.4739
2021-02-19 2020-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 477,070 3,852 0.81 222,210 9.61 0.5066
2020-11-13 2020-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 473,218 0 0.00 202,722 18.23 0.5325
2020-08-11 2020-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 473,218 1,524 0.32 171,466 28.18 0.4897
2020-05-27 2020-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 471,694 5,888 1.26 133,772 -11.60 0.4528
2020-02-21 2019-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 465,806 30,606 7.03 151,326 19.38 0.4151
2019-11-15 2019-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 435,200 20,802 5.02 126,761 4.16 0.4011
2019-08-14 2019-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 414,398 21,694 5.52 121,700 13.22 0.4067
2019-05-15 2019-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 392,704 14,630 3.87 107,491 15.51 0.4135
2019-02-15 2018-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 378,074 20,921 5.86 93,059 6.75 0.3839
2018-11-15 2018-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 357,153 280 0.08 87,174 18.80 0.3549
2018-08-14 2018-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 356,873 24,184 7.27 73,377 6.83 0.3320
2018-04-13 2018-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 332,689 8,758 2.70 68,687 11.67 0.3405
2018-01-17 2017-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 323,931 5,445 1.71 61,508 3.58 0.3071
2017-10-16 2017-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 318,486 12,778 4.18 59,382 11.70 0.3268
2017-07-13 2017-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 305,708 23,707 8.41 53,160 22.48 0.3166
2017-04-11 2017-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 282,001 3,599 1.29 43,403 10.49 0.2906
2017-01-18 2016-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 278,402 18,144 6.97 39,283 -5.11 0.2687
2016-10-14 2016-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 260,258 20,629 8.61 41,397 16.91 0.3318
2016-08-11 2016-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 239,629 23,521 10.88 35,408 15.72 0.3143
2016-05-16 2016-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 216,108 8,516 4.10 30,599 3.91 0.3065
2016-02-12 2015-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 207,592 12,397 6.35 29,447 23.37 0.3093
2015-10-15 2015-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 195,195 30,599 18.59 23,868 11.76 0.3018
2015-07-15 2015-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 164,596 23,121 16.34 21,357 12.37 0.2770
2015-04-15 2015-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 141,475 20,016 16.48 19,006 24.89 0.2746
2015-01-13 2014-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 121,459 -630 -0.52 15,218 2.42 0.2568
2014-11-07 2014-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 122,089 122,089 14,858 0.2359
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.