Thermo Fisher Scientific Inc.
MX ˙ BMV ˙ US8835561023
SecurityMX:TMO / Thermo Fisher Scientific Inc.
InstitutionTower Research Capital LLC (TRC)
Latest Disclosed Ownership6,754 shares
Latest Disclosed Value $ 3,319,794
Tower Research Capital LLC (TRC) reports 28.33% decrease in ownership of TMO / Thermo Fisher Scientific Inc.

On May 15, 2026 - Tower Research Capital LLC (TRC) filed a 13F-HR form disclosing ownership of 6,754 shares of Thermo Fisher Scientific Inc. (MX:TMO) valued at $3,319,794 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 9,424 shares of Thermo Fisher Scientific Inc.. This represents a change in shares of -28.33% 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 6,754 -2,670 -28.33 3,320 -39.21 0.0569
2026-02-17 2025-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 9,424 3,091 48.81 5,461 77.79 0.1321
2025-11-14 2025-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 6,333 -14,131 -69.05 3,072 -62.99 0.0848
2025-08-15 2025-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 20,464 -1,362 -6.24 8,297 -22.84 0.2237
2025-05-15 2025-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 21,826 496 2.33 10,753 -3.09 0.3203
2025-02-13 2024-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 21,330 8,946 72.24 11,097 44.86 0.2202
2024-11-14 2024-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 12,384 -10,756 -46.48 7,660 -40.14 0.2027
2024-08-13 2024-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 23,140 13,251 134.00 12,796 122.66 0.2160
2024-05-15 2024-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 9,889 -45,740 -82.22 5,748 -80.54 0.1384
2024-02-13 2023-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 55,629 40,207 260.71 29,527 278.26 0.3647
2023-11-14 2023-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 15,422 9,098 143.86 7,806 136.62 0.2442
2023-08-14 2023-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 6,324 -645 -9.26 3,300 82,375.00 0.1099
2023-05-09 2023-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 6,969 748 12.02 4 33.33 0.1278
2023-02-10 2022-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 6,221 -31,219 -83.38 3 -99.98 0.1419
2022-11-10 2022-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 37,440 22,220 145.99 18,989 129.64 0.3082
2022-08-15 2022-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 15,220 -37,180 -70.95 8,269 -73.28 0.1854
2022-05-12 2022-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 52,400 22,367 74.47 30,950 54.44 0.2959
2022-02-14 2021-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 30,033 23,093 332.75 20,040 405.42 0.3467
2021-11-15 2021-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 6,940 -354 -4.85 3,965 7.77 0.1012
2021-08-16 2021-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 7,294 -30,722 -80.81 3,679 -78.80 0.0957
2021-05-17 2021-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 38,016 27,164 250.31 17,350 243.22 0.2921
2021-02-16 2020-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 10,852 2,693 33.01 5,055 40.34 0.1545
2020-11-16 2020-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 8,159 152 1.90 3,602 24.16 0.0399
2020-08-13 2020-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 8,007 4,242 112.67 2,901 171.63 0.1191
2020-05-15 2020-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 3,765 3,529 1,495.34 1,068 1,287.01 0.0650
2020-02-07 2019-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 236 -8,000 -97.13 77 -96.79 0.0064
2019-11-05 2019-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 8,236 8,215 39,119.05 2,399 39,883.33 0.1644
2019-08-13 2019-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 21 -5,664 -99.63 6 -99.61 0.0004
2019-05-14 2019-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 5,685 -4,964 -46.61 1,556 -34.70 0.0944
2019-02-14 2018-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 10,649 10,488 6,514.29 2,383 6,010.26 0.1718
2018-11-13 2018-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 161 -8,789 -98.20 39 -97.90 0.0029
2018-08-14 2018-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 8,950 8,950 1,854 0.1038
2018-05-15 2018-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 0 -2,405 -100.00 0 -100.00
2018-02-09 2017-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 2,405 1,758 271.72 457 274.59 0.0590
2017-11-14 2017-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 647 141 27.87 122 38.64 0.0101
2017-08-14 2017-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 506 -483 -48.84 88 -42.11 0.0100
2017-05-19 2017-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 989 -9,019 -90.12 152 -89.24 0.0152
2017-02-03 2016-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 10,008 9,577 2,222.04 1,412 1,946.38 0.1533
2016-11-08 2016-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 431 -3,289 -88.41 69 -87.43 0.0069
2016-08-10 2016-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 3,720 3,429 1,178.35 549 1,239.02 0.0524
2016-05-16 2016-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 291 291 0.00 41 0.0061
2015-07-30 2015-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 0 -1,470 -100.00 0 -100.00
2015-05-12 2015-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,470 -385 -20.75 197 -15.09 0.0244
2015-02-05 2014-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,855 -8,942 -82.82 232 -82.34 0.0695
2014-10-31 2014-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 10,797 10,528 3,913.75 1,314 4,006.25 0.1473
2014-08-14 2014-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 269 -5,094 -94.98 32 -95.04 0.0041
2014-05-02 2014-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 5,363 5,001 1,381.49 645 1,512.50 0.0827
2014-01-31 2013-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 362 -11,465 -96.94 40 -96.33 0.0067
2013-11-06 2013-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 11,827 10,987 1,307.98 1,090 1,435.21 0.1175
2013-08-05 2013-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 840 840 71 0.0058
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.