Thermo Fisher Scientific Inc.
MX ˙ BMV ˙ US8835561023
SecurityMX:TMO / Thermo Fisher Scientific Inc.
InstitutionGabelli Funds Llc
Latest Disclosed Ownership14,570 shares
Latest Disclosed Value $ 7,161,592
Gabelli Funds Llc reports 2.35% decrease in ownership of TMO / Thermo Fisher Scientific Inc.

On May 14, 2026 - Gabelli Funds Llc filed a 13F-HR form disclosing ownership of 14,570 shares of Thermo Fisher Scientific Inc. (MX:TMO) valued at $7,161,592 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 5, 2026 disclosing 14,920 shares of Thermo Fisher Scientific Inc.. This represents a change in shares of -2.35% 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)
2026-05-14 2026-03-31 13F THERMO FISHER SCIENTIFIC EQUITY 883556102 14,570 -350 -2.35 7,162 -17.17 0.0484
2026-02-05 2025-12-31 13F THERMO FISHER SCIENTIFIC EQUITY 883556102 14,920 -9,745 -39.51 8,645 -27.74 0.0585
2025-11-12 2025-09-30 13F THERMO FISHER SCIENTIFIC EQUITY 883556102 24,665 -370 -1.48 11,963 17.86 0.0810
2025-08-13 2025-06-30 13F THERMO FISHER SCIENTIFIC EQUITY 883556102 25,035 0 0.00 10,151 -18.52 0.0721
2025-05-14 2025-03-31 13F THERMO FISHER SCIENTIFIC EQUITY 883556102 25,035 0 0.00 12,457 -4.35 0.0949
2025-02-13 2024-12-31 13F THERMO FISHER SCIENTIFIC EQUITY 883556102 25,035 -885 -3.41 13,024 -18.77 0.0978
2024-11-13 2024-09-30 13F THERMO FISHER SCIENTIFIC EQUITY 883556102 25,920 -3,580 -12.14 16,033 -1.72 0.1156
2024-08-13 2024-06-30 13F THERMO FISHER SCIENTIFIC EQUITY 883556102 29,500 65 0.22 16,314 -4.64 0.1239
2024-05-14 2024-03-31 13F THERMO FISHER SCIENTIFIC EQUITY 883556102 29,435 200 0.68 17,108 10.25 0.1260
2024-02-13 2023-12-31 13F THERMO FISHER SCIENTIFIC EQUITY 883556102 29,235 -31,865 -52.15 15,518 -49.83 0.1195
2023-11-08 2023-09-30 13F THERMO FISHER SCIENTIFIC EQUITY 883556102 61,100 -11,728 -16.10 30,927 -18.61 0.2509
2023-08-10 2023-06-30 13F THERMO FISHER SCIENTIFIC EQUITY 883556102 72,828 7,990 12.32 37,998 1.68 0.2880
2023-05-12 2023-03-31 13F THERMO FISHER SCIENTIFIC EQUITY 883556102 64,838 -3,620 -5.29 37,371 -0.87 0.2832
2023-02-13 2022-12-31 13F THERMO FISHER SCIENTIFIC EQUITY 883556102 68,458 -10,350 -13.13 37,699 -5.68 0.2930
2022-11-14 2022-09-30 13F/A-1 THERMO FISHER SCIENTIFIC COM 883556102 78,808 -4,907 -5.86 39,971 -12.11 0.3295
2022-11-10 2022-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 78,808 -4,907 39,971 0.3295
2022-08-12 2022-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 83,715 1,283 1.56 45,481 -6.59 0.3492
2022-05-18 2022-03-31 13F/A-1 THERMO FISHER SCIENTIFIC COM 883556102 82,432 -487 -0.59 48,688 -12.00 0.3199
2022-05-13 2022-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 82,432 -487 48,688 0.3287
2022-02-11 2021-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 82,919 20,599 33.05 55,327 55.39 0.3492
2021-11-12 2021-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 62,320 -4,750 -7.08 35,605 5.23 0.2359
2021-08-13 2021-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 67,070 -14,348 -17.62 33,835 -8.94 0.2155
2021-05-14 2021-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 81,418 -40,752 -33.36 37,158 -34.70 0.2491
2021-02-05 2020-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 122,170 -32,180 -20.85 56,904 -16.50 0.4054
2020-11-06 2020-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 154,350 1,500 0.98 68,149 23.05 0.5309
2020-08-13 2020-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 152,850 36,100 30.92 55,384 67.27 0.4513
2020-05-14 2020-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 116,750 -28,400 -19.57 33,110 -29.78 0.2950
2020-02-14 2019-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 145,150 0 0.00 47,155 11.54 0.3050
2019-11-01 2019-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 145,150 5,400 3.86 42,278 3.01 0.2793
2019-08-02 2019-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 139,750 -9,000 -6.05 41,042 0.80 0.2635
2019-05-02 2019-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 148,750 13,350 9.86 40,716 34.37 0.2560
2019-01-30 2018-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 135,400 -1,200 -0.88 30,301 -9.12 0.2078
2018-11-02 2018-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 136,600 -3,900 -2.78 33,341 14.56 0.1913
2018-08-10 2018-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 140,500 9,500 7.25 29,103 7.61 0.1724
2018-05-09 2018-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 131,000 -19,500 -12.96 27,046 -5.36 0.1613
2018-02-02 2017-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 150,500 0 0.00 28,577 0.36 0.1646
2017-11-01 2017-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 150,500 5,000 3.44 28,475 12.17 0.1631
2017-08-03 2017-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 145,500 0 0.00 25,385 13.58 0.1508
2017-05-04 2017-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 145,500 7,000 5.05 22,349 14.36 0.1318
2017-02-10 2016-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 138,500 14,500 11.69 19,542 -0.92 0.1156
2016-11-10 2016-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 124,000 0 0.00 19,723 7.65 0.1170
2016-08-04 2016-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 124,000 -7,100 -5.42 18,322 -1.29 0.1081
2016-05-05 2016-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 131,100 2,400 1.86 18,562 1.68 0.1119
2016-02-05 2015-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 128,700 -800 -0.62 18,256 15.29 0.1105
2015-10-23 2015-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 129,500 2,400 1.89 15,835 -3.98 0.0941
2015-08-05 2015-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 127,100 14,100 12.48 16,492 8.64 0.0863
2015-05-01 2015-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 113,000 33,000 41.25 15,180 51.45 0.0770
2015-02-05 2014-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 80,000 30,000 60.00 10,023 64.72 0.0487
2014-10-30 2014-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 50,000 50,000 6,085 0.0309
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.