Thermo Fisher Scientific Inc.
MX ˙ BMV ˙ US8835561023
SecurityMX:TMO / Thermo Fisher Scientific Inc.
InstitutionSectoral Asset Management Inc
Latest Disclosed Ownership3,508 shares
Latest Disclosed Value $ 1,724,287
Sectoral Asset Management Inc reports 10.05% decrease in ownership of TMO / Thermo Fisher Scientific Inc.

On May 15, 2026 - Sectoral Asset Management Inc filed a 13F-HR form disclosing ownership of 3,508 shares of Thermo Fisher Scientific Inc. (MX:TMO) valued at $1,724,287 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 9, 2026 disclosing 3,900 shares of Thermo Fisher Scientific Inc.. This represents a change in shares of -10.05% 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 3,508 -392 -10.05 1,724 -23.68 1.4282
2026-02-09 2025-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 3,900 0 0.00 2,260 19.40 1.8115
2025-11-14 2025-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 3,900 0 0.00 1,893 19.60 1.1683
2025-08-14 2025-06-30 13F THERMO FISHER SCI COM 883556102 3,900 650 20.00 1,582 -2.16 1.0448
2025-05-15 2025-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 3,250 -1,500 -31.58 1,617 -34.59 1.2587
2025-02-14 2024-12-31 13F THERMO FISHER SCI COM 883556102 4,750 -500 -9.52 2,472 -23.87 1.6502
2024-11-14 2024-09-30 13F THERMO FISHER SCI COM 883556102 5,250 -5,265 -50.07 3,247 -44.15 1.9182
2024-08-13 2024-06-30 13F THERMO FISHER SCI COM 883556102 10,515 500 4.99 5,815 -0.10 2.3632
2024-05-14 2024-03-31 13F THERMO FISHER SCI COM 883556102 10,015 1,000 11.09 5,821 21.63 2.2883
2024-02-14 2023-12-31 13F THERMO FISHER SCI COM 883556102 9,015 1,850 25.82 4,785 31.96 2.0605
2023-11-14 2023-09-30 13F THERMO FISHER SCI COMMON 883556102 7,165 0 0.00 3,627 -3.00 0.7062
2023-08-11 2023-06-30 13F THERMO FISHER SCI COM 883556102 7,165 -800 -10.04 3,738 -18.56 0.6233
2023-05-12 2023-03-31 13F THERMO FISHER SCI COM 883556102 7,965 0 0.00 4,591 4.65 0.8823
2023-02-10 2022-12-31 13F THERMO FISHER SCI COM 883556102 7,965 2,125 36.39 4,386 48.08 0.8488
2022-11-10 2022-09-30 13F THERMO FISHER SCI COM 883556102 5,840 0 0.00 2,962 -6.65 0.5836
2022-08-15 2022-06-30 13F THERMO FISHER SCI COM 883556102 5,840 -10,885 -65.08 3,173 -67.88 0.6393
2022-05-10 2022-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 16,725 -425 -2.48 9,879 -13.67 1.7537
2022-02-11 2021-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 17,150 -1,500 -8.04 11,443 7.40 1.7222
2021-11-15 2021-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 18,650 8,250 79.33 10,655 103.11 0.8862
2021-08-16 2021-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 10,400 0 0.00 5,246 10.54 0.4244
2021-05-14 2021-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 10,400 0 0.00 4,746 -2.02 0.3598
2021-02-12 2020-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 10,400 1,750 20.23 4,844 26.84 0.3413
2020-11-13 2020-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 8,650 8,650 3,819 0.3283
2020-05-13 2020-03-31 13F THERMO FISHER SCI COM 883556102 0 -11,750 -100.00 0 -100.00
2020-02-12 2019-12-31 13F THERMO FISHER SCI COM 883556102 11,750 -6,450 -35.44 3,817 -27.99 0.5695
2019-11-14 2019-09-30 13F THERMO FISHER SCI COM 883556102 18,200 14,750 427.54 5,301 423.30 0.9145
2019-08-14 2019-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 3,450 -1,099 -24.16 1,013 -18.63 0.1211
2019-05-14 2019-03-31 13F THERMO FISHER SCI COM 883556102 4,549 0 0.00 1,245 22.30 0.1497
2019-02-12 2018-12-31 13F THERMO FISHER SCI COMMON 883556102 4,549 0 0.00 1,018 -8.29 0.1384
2018-11-14 2018-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 4,549 4,549 1,110 0.1178
2016-08-12 2016-06-30 13F THERMO FISHER SCI COMMON 883556102 0 -370,376 -100.00 0 -100.00
2016-05-13 2016-03-31 13F THERMO FISHER SCI COMMON 883556102 370,376 -236,560 -38.98 52,442 -39.09 2.5356
2016-02-12 2015-12-31 13F THERMO FISHER SCI COMMON 883556102 606,936 1,300 0.21 86,094 16.25 3.6708
2015-11-13 2015-09-30 13F THERMO FISHER SCIENTIFIC COMMON 883556102 605,636 15,600 2.64 74,057 -3.27 3.3926
2015-08-13 2015-06-30 13F THERMO FISHER SCIENTIFIC COMMON 883556102 590,036 2,900 0.49 76,563 -2.93 3.1935
2015-05-14 2015-03-31 13F THERMO FISHER SCIENTIFIC COMMON 883556102 587,136 66,450 12.76 78,876 20.91 2.9951
2015-02-13 2014-12-31 13F THERMO FISHER SCIENTIFIC COMMON 883556102 520,686 -3,914 -0.75 65,237 2.18 2.9262
2014-11-13 2014-09-30 13F THERMO FISHER SCI COM 883556102 524,600 84,300 19.15 63,844 22.88 2.6867
2014-08-14 2014-06-30 13F THERMO FISHER SCIENTIFIC COMMON 883556102 440,300 -345,200 -43.95 51,955 -44.99 2.2014
2014-05-14 2014-03-31 13F THERMO FISHER SCI COMMON 883556102 785,500 268,900 52.05 94,449 64.19 3.8851
2014-02-12 2013-12-31 13F THERMO FISHER SCI COMMON 883556102 516,600 -116,800 -18.44 57,523 -1.45 2.4806
2013-11-13 2013-09-30 13F THERMO FISHER SCI COMMON 883556102 633,400 125,600 24.73 58,368 35.82 2.8084
2013-08-12 2013-06-30 13F THERMO FISHER SCI COMMON 883556102 507,800 507,800 42,975 1.2708
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.