Thermo Fisher Scientific Inc.
MX ˙ BMV ˙ US8835561023
SecurityMX:TMO / Thermo Fisher Scientific Inc.
InstitutionRathbone Brothers plc
Latest Disclosed Ownership953,908 shares
Latest Disclosed Value $ 468,874,399
Rathbone Brothers plc reports 2.93% increase in ownership of TMO / Thermo Fisher Scientific Inc.

On May 12, 2026 - Rathbone Brothers plc filed a 13F-HR form disclosing ownership of 953,908 shares of Thermo Fisher Scientific Inc. (MX:TMO) valued at $468,874,399 USD as of March 31, 2026. The entity filed a previous 13F-HR/A on February 6, 2026 disclosing 926,733 shares of Thermo Fisher Scientific Inc.. This represents a change in shares of 2.93% 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 INC USD1 COM 883556102 953,908 27,175 2.93 468,874 -12.69 2.0033
2026-02-06 2025-12-31 13F/A-1 THERMO FISHER SCIENTIFIC INC USD1 COM 883556102 926,733 -15,658 -1.66 536,995 17.48 2.1258
2026-01-21 2025-12-31 13F THERMO FISHER SCIENTIFIC INC USD1 COM 883556102 926,733 -15,658 536,995 2.1258
2025-11-13 2025-09-30 13F THERMO FISHER SCIENTIFIC INC USD1 COM 883556102 942,391 37,037 4.09 457,078 24.52 1.8559
2025-08-07 2025-06-30 13F THERMO FISHER SCIENTIFIC INC USD1 COM 883556102 905,354 63,364 7.53 367,085 -12.39 1.5832
2025-05-13 2025-03-31 13F THERMO FISHER SCIENTIFIC INC USD1 COM 883556102 841,990 45,673 5.74 418,974 1.14 2.0246
2025-02-13 2024-12-31 13F THERMO FISHER SCIENTIFIC INC USD1 COM 883556102 796,317 48,825 6.53 414,268 -10.40 2.0055
2024-11-13 2024-09-30 13F THERMO FISHER SCIENTIFIC INC USD1 COM 883556102 747,492 25,080 3.47 462,376 15.74 2.3332
2024-08-09 2024-06-30 13F THERMO FISHER SCIENTIFIC INC USD1 COM 883556102 722,412 37,954 5.55 399,494 0.42 2.1759
2024-05-14 2024-03-31 13F THERMO FISHER SCIENTIFIC INC USD1 COM 883556102 684,458 67,138 10.88 397,814 21.41 2.2958
2024-02-13 2023-12-31 13F THERMO FISHER SCIENTIFIC INC USD1 COM 883556102 617,320 48,350 8.50 327,667 13.78 2.1117
2023-11-13 2023-09-30 13F THERMO FISHER SCIENTIFIC INC USD1 COM 883556102 568,970 299,338 111.02 287,996 104.72 2.0885
2023-08-04 2023-06-30 13F THERMO FISHER SCIENTIFIC INC USD1 COM 883556102 269,632 39,663 17.25 140,680 6.14 1.3129
2023-05-12 2023-03-31 13F THERMO FISHER SCIENTIFIC INC USD1 COM 883556102 229,969 13,925 6.45 132,547 11.41 1.3552
2023-02-14 2022-12-31 13F THERMO FISHER SCIENTIFIC INC USD1 COM 883556102 216,044 13,651 6.74 118,973 15.90 1.3396
2022-11-14 2022-09-30 13F/A-1 THERMO FISHER SCIENTIFIC INC USD1 COM 883556102 202,393 15,174 8.10 102,652 0.92 1.2665
2022-11-03 2022-09-30 13F THERMO FISHER SCIENTIFIC INC USD1 COM 883556102 202,393 15,174 102,652 1.2665
2022-08-12 2022-06-30 13F THERMO FISHER SCIENTIFIC INC USD1 COM 883556102 187,219 7,393 4.11 101,712 -4.24 1.1660
2022-05-11 2022-03-31 13F THERMO FISHER SCIENTIFIC INC USD1 COM 883556102 179,826 19,421 12.11 106,214 -0.76 1.0837
2022-02-10 2021-12-31 13F THERMO FISHER SCIENTIFIC INC USD1 COM 883556102 160,405 13,400 9.12 107,029 27.43 1.0401
2021-11-04 2021-09-30 13F THERMO FISHER SCIENTIFIC INC USD1 COM 883556102 147,005 11,699 8.65 83,988 23.04 0.9036
2021-07-30 2021-06-30 13F THERMO FISHER SCIENTIFIC INC USD1 COM 883556102 135,306 27,465 25.47 68,258 38.69 0.7583
2021-05-14 2021-03-31 13F THERMO FISHER SCIENTIFIC INC USD1 COM 883556102 107,841 42,276 64.48 49,216 61.16 0.6302
2021-02-11 2020-12-31 13F THERMO FISHER SCIENTIFIC INC USD1 COM 883556102 65,565 31,300 91.35 30,539 101.86 0.4336
2020-11-13 2020-09-30 13F THERMO FISHER SCIENTIFIC INC USD1 COM 883556102 34,265 666 1.98 15,129 24.27 0.2589
2020-08-07 2020-06-30 13F THERMO FISHER SCIENTIFIC INC USD1 COM 883556102 33,599 22,957 215.72 12,174 303.38 0.2471
2020-05-04 2020-03-31 13F THERMO FISHER SCIENTIFIC INC USD1 COM 883556102 10,642 9,747 1,089.05 3,018 937.11 0.0879
2020-02-11 2019-12-31 13F THERMO FISHER SCIENTIFIC INC USD1 COM 883556102 895 0 0.00 291 11.49 0.0077
2019-11-13 2019-09-30 13F THERMO FISHER SCIENTIFIC INC USD1 COM 883556102 895 0 0.00 261 -0.76 0.0074
2019-08-12 2019-06-30 13F THERMO FISHER SCIENTIFIC INC USD1 COM 883556102 895 0 0.00 263 7.35 0.0082
2019-05-09 2019-03-31 13F THERMO FISHER SCIENTIFIC INC USD1 COM 883556102 895 -490 -35.38 245 -20.97 0.0081
2019-02-12 2018-12-31 13F THERMO FISHER SCIENTIFIC INC USD1 COM 883556102 1,385 290 26.48 310 16.10 0.0119
2018-10-12 2018-09-30 13F THERMO FISHER SCIENTIFIC INC USD1 COM 883556102 1,095 0 0.00 267 17.62 0.0091
2018-07-16 2018-06-30 13F THERMO FISHER SCIENTIFIC INC USD1 COM 883556102 1,095 0 0.00 227 0.44 0.0086
2018-04-06 2018-03-31 13F THERMO FISHER SCIENTIFIC INC USD1 COM 883556102 1,095 -35 -3.10 226 5.12 0.0092
2018-01-24 2017-12-31 13F THERMO FISHER SCIENTIFIC INC USD1 COM 883556102 1,130 -25 -2.16 215 -1.83 0.0088
2017-10-24 2017-09-30 13F THERMO FISHER SCIENTIFIC INC USD1 COM 883556102 1,155 0 0.00 219 8.42 0.0095
2017-08-10 2017-06-30 13F THERMO FISHER SCIENTIFIC INC USD1 COM 883556102 1,155 1,155 202 0.0090
2016-04-08 2016-03-31 13F THERMO FISHER SCIENTIFIC INC US$1 COM 883556102 0 0 0 0.0000
2016-01-19 2015-12-31 13F THERMO FISHER SCIENTIFIC INC US$1 COM 883556102 0 0 0 0.0000
2014-10-23 2014-09-30 13F THERMO FISHER SCIENTIFIC INC US$1 COM 883556102 0 -4,405 -100.00 0 -100.00
2014-07-02 2014-06-30 13F THERMO FISHER SCIENTIFIC INC US$1 COM 883556102 4,405 0 0.00 520 -1.89 0.0367
2014-04-11 2014-03-31 13F/A-1 THERMO FISHER SCIENTIFIC INC US$1 COM 883556102 4,405 -1,000 -18.50 530 6.43 0.0425
2014-04-10 2014-03-31 13F MERCK & CO INC US$0.50 COM 883556102 48,361 2,745
2013-10-11 2013-09-30 13F THERMO FISHER SCIENTIFIC INC US$1 COM 883556102 5,405 0 0.00 498 8.97 0.0580
2013-08-06 2013-06-30 13F THERMO FISHER SCIENTIFIC INC US$1 COM 883556102 5,405 5,405 457 0.0615
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.