Thermo Fisher Scientific Inc.
MX ˙ BMV ˙ US8835561023
SecurityMX:TMO / Thermo Fisher Scientific Inc.
InstitutionWellington Management Group Llp
Latest Disclosed Ownership1,478,251 shares
Latest Disclosed Value $ 726,604,714
Wellington Management Group Llp reports 57.38% decrease in ownership of TMO / Thermo Fisher Scientific Inc.

On May 15, 2026 - Wellington Management Group Llp filed a 13F-HR form disclosing ownership of 1,478,251 shares of Thermo Fisher Scientific Inc. (MX:TMO) valued at $726,604,714 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 3,468,240 shares of Thermo Fisher Scientific Inc.. This represents a change in shares of -57.38% 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)
2026-05-15 2026-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,478,251 -1,989,989 -57.38 726,605 -63.84 0.0192
2026-02-17 2025-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 3,468,240 768,780 28.48 2,009,672 53.49 0.3522
2025-11-14 2025-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 2,699,460 1,270,191 88.87 1,309,292 125.93 0.2292
2025-08-14 2025-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 1,429,269 -166,446 -10.43 579,511 -27.02 0.1052
2025-05-13 2025-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,595,715 167,763 11.75 794,028 6.89 0.1527
2025-02-12 2024-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,427,952 -1,100,685 -43.53 742,863 -52.51 0.1360
2024-11-14 2024-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 2,528,637 -497,243 -16.43 1,564,139 -6.52 0.2739
2024-08-14 2024-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 3,025,880 -44,647 -1.45 1,673,312 -6.24 0.2987
2024-05-15 2024-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 3,070,527 82,387 2.76 1,784,621 12.52 0.3162
2024-02-12 2023-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 2,988,140 -92,547 -3.00 1,586,075 1.71 0.2960
2023-11-14 2023-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 3,080,687 274,464 9.78 1,559,351 6.50 0.3127
2023-08-14 2023-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 2,806,223 -83,893 -2.90 1,464,147 -12.10 0.2776
2023-05-12 2023-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 2,890,116 -43,755 -1.49 1,665,776 3.10 0.3301
2023-02-13 2022-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 2,933,871 -2,314 -0.08 1,615,653 8.49 0.3240
2022-11-14 2022-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 2,936,185 -58,160 -1.94 1,489,204 -8.46 0.3172
2022-08-15 2022-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 2,994,345 -21,535 -0.71 1,626,769 -8.68 0.3276
2022-05-16 2022-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 3,015,880 -31,852 -1.05 1,781,330 -12.40 0.3050
2022-02-11 2021-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 3,047,732 -146,262 -4.58 2,033,568 11.44 0.3252
2021-11-15 2021-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 3,193,994 -941,382 -22.76 1,824,826 -12.53 0.3104
2021-08-16 2021-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 4,135,376 -1,029,608 -19.93 2,086,172 -11.50 0.3472
2021-05-17 2021-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 5,164,984 -2,135,182 -29.25 2,357,195 -30.68 0.4151
2021-02-12 2020-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 7,300,166 -425,422 -5.51 3,400,271 -0.31 0.6261
2020-11-16 2020-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 7,725,588 -20,983 -0.27 3,411,001 21.52 0.7060
2020-08-14 2020-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 7,746,571 214,446 2.85 2,806,892 31.40 0.6250
2020-05-14 2020-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 7,532,125 -272,800 -3.50 2,136,112 -15.75 0.5653
2020-02-11 2019-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 7,804,925 -509,625 -6.13 2,535,587 4.70 0.5314
2019-11-13 2019-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 8,314,550 -133,075 -1.58 2,421,779 -2.38 0.5461
2019-08-14 2019-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 8,447,625 -461,953 -5.18 2,480,900 1.73 0.5492
2019-05-15 2019-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 8,909,578 -202,619 -2.22 2,438,729 19.59 0.5523
2019-02-14 2018-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 9,112,197 -877,542 -8.78 2,039,218 -16.37 0.5104
2018-11-14 2018-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 9,989,739 -106,427 -1.05 2,438,296 16.59 0.5135
2018-08-14 2018-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 10,096,166 453,879 4.71 2,091,320 5.05 0.4655
2018-05-15 2018-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 9,642,287 928,156 10.65 1,990,747 20.31 0.4505
2018-02-13 2017-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 8,714,131 285,484 3.39 1,654,638 3.76 0.3656
2017-11-13 2017-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 8,428,647 2,285,984 37.21 1,594,700 48.80 0.3661
2017-08-14 2017-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 6,142,663 -1,369,489 -18.23 1,071,711 -7.12 0.2523
2017-05-11 2017-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 7,512,152 398,622 5.60 1,153,867 14.96 0.2779
2017-02-14 2016-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 7,113,530 448,546 6.73 1,003,720 -5.32 0.2518
2016-11-14 2016-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 6,664,984 517,019 8.41 1,060,132 16.70 0.2656
2016-08-15 2016-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 6,147,965 12,296 0.20 908,424 4.57 0.2348
2016-05-13 2016-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 6,135,669 1,267,967 26.05 868,749 25.82 0.2286
2016-02-12 2015-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 4,867,702 124,678 2.63 690,483 19.05 0.1806
2015-11-16 2015-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 4,743,024 833,543 21.32 579,977 14.33 0.1617
2015-08-14 2015-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 3,909,481 520,101 15.35 507,294 11.41 0.1309
2015-05-15 2015-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 3,389,380 131,646 4.04 455,330 11.56 0.1171
2015-02-13 2014-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 3,257,734 879,258 36.97 408,161 41.01 0.1079
2014-11-14 2014-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 2,378,476 2,364,664 17,120.36 289,460 17,658.28 0.0797
2014-08-14 2014-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 13,812 3,483 33.72 1,630 31.24 0.0004
2014-05-15 2014-03-31 13F THERMOFISHER COM 883556102 10,329 0 0.00 1,242 8.00 0.0003
2014-02-14 2013-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 10,329 0 0.00 1,150 20.80 0.0003
2013-11-14 2013-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 10,329 -63,933 -86.09 952 -84.85 0.0003
2013-08-14 2013-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 74,262 74,262 6,285 0.0021
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.