Thermo Fisher Scientific Inc.
MX ˙ BMV ˙ US8835561023
SecurityMX:TMO / Thermo Fisher Scientific Inc.
InstitutionChelsea Counsel Co
Latest Disclosed Ownership5,255 shares
Latest Disclosed Value $ 2,585,131
Chelsea Counsel Co reports 2.50% decrease in ownership of TMO / Thermo Fisher Scientific Inc.

On June 4, 2026 - Chelsea Counsel Co filed a 13F-HR/A form disclosing ownership of 5,255 shares of Thermo Fisher Scientific Inc. (MX:TMO) valued at $2,585,131 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 24, 2026 disclosing 5,390 shares of Thermo Fisher Scientific Inc.. This represents a change in shares of -2.50% 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)
2026-06-04 2026-03-31 13F/A-1 THERMO FISHER SCIENTIFIC COM 883556102 5,255 -135 -2.50 2,585 -17.28 1.1385
2026-04-23 2026-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 5,390 0 3,125 1.3423
2026-02-24 2025-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 5,390 -20 -0.37 3,125 19.00 1.3423
2025-11-25 2025-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 5,410 -10 -0.18 2,626 19.42 1.1661
2025-07-18 2025-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 5,420 -1,740 -24.30 2,200 -38.32 1.0907
2025-05-22 2025-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 7,160 -112 -1.54 3,566 -5.81 1.9382
2025-02-27 2024-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 7,272 -490 -6.31 3,786 -21.20 1.9539
2024-11-21 2024-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 7,762 -980 -11.21 4,804 -0.70 2.3673
2024-11-21 2024-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 8,742 -8 -0.09 4,837 -4.93 2.4141
2024-06-17 2024-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 8,750 -240 -2.67 5,089 6.58 2.8851
2024-02-21 2023-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 8,990 -220 -2.39 4,775 2.36 2.5327
2023-11-22 2023-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 9,210 -50 -0.54 4,665 -3.52 2.3999
2023-11-22 2023-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 9,260 -150 -1.59 4,834 -10.91 2.3798
2023-05-19 2023-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 9,410 -415 -4.22 5,427 0.24 2.6354
2023-02-23 2022-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 9,825 -1,683 -14.62 5,413 -7.26 2.7034
2022-10-31 2022-09-30 13F THERMO FISHER SCIENTIFIC COMMON 883556102 11,508 -592 -4.89 5,837 -11.20 3.5992
2022-08-01 2022-06-30 13F THERMO FISHER SCIENTIFIC COMMON 883556102 12,100 -500 -3.97 6,573 -11.68 3.3768
2022-05-24 2022-03-31 13F THERMO FISHER SCIENTIFIC COMMON 883556102 12,600 -750 -5.62 7,442 -16.46 3.2787
2022-05-23 2021-12-31 13F THERMO FISHER SCIENTIFIC COMMON 883556102 13,350 -480 -3.47 8,908 12.73 3.8568
2022-02-10 2021-09-30 13F THERMO FISHER SCIENTIFIC COMMON 883556102 13,830 90 0.66 7,902 14.01 3.5934
2022-02-10 2021-06-30 13F THERMO FISHER SCIENTIFIC COMMON 883556102 13,740 20 0.15 6,931 10.70 3.1948
2022-02-10 2021-03-31 13F THERMO FISHER SCIENTIFIC COMMON 883556102 13,720 -345 -2.45 6,261 -4.43 3.1035
2022-03-08 2020-12-31 13F THERMO FISHER SCIENTIFIC COMMON 883556102 14,065 -2,573 -15.46 6,551 -10.82 3.3715
2022-05-06 2020-09-30 13F THERMO FISHER SCIENTIFIC COMMON 883556102 16,638 -1,525 -8.40 7,346 11.62 2.9499
2022-05-06 2020-09-30 13F THERMO FISHER SCIENTIFIC COMMON 883556102 3,165 1,397
2022-05-06 2020-06-30 13F THERMO FISHER SCIENTIFIC COMMON 883556102 18,163 46 0.25 6,581 28.08 2.5196
2022-05-06 2020-06-30 13F THERMO FISHER SCIENTIFIC COMMON 883556102 18,163 6,581
2020-06-12 2020-03-31 13F THERMO FISHER SCIENTIFIC COMMON 883556102 18,117 -13,445 -42.60 5,138 -49.89 4.0285
2020-03-23 2019-12-31 13F THERMO FISHER SCIENTIFIC COMMON 883556102 31,562 -2,677 -7.82 10,253 2.81 6.2380
2020-03-27 2019-09-30 13F/A-1 THERMO FISHER SCIENTIFIC COMMON 883556102 34,239 -5,602 -14.06 9,973 -14.76 6.0032
2020-03-23 2019-09-30 13F THERMO FISHER SCIENTIFIC COMMON 883556102 30,809 -9,032 0
2019-12-09 2019-06-30 13F THERMO FISHER SCIENTIFIC COMMON 883556102 39,841 -215 -0.54 11,700 6.71 6.2619
2019-12-09 2019-03-31 13F THERMO FISHER SCIENTIFIC COMMON 883556102 40,056 -175 -0.43 10,964 21.78 5.9078
2019-12-09 2018-12-31 13F THERMO FISHER SCIENTIFIC COMMON 883556102 40,231 -92 -0.23 9,003 -8.52 5.4647
2019-12-09 2018-09-30 13F THERMO FISHER SCIENTIFIC COMMON 883556102 40,323 3,465 9.40 9,842 28.91 5.1299
2018-10-03 2018-06-30 13F THERMO FISHER SCIENTIFIC COMMON 883556102 36,858 -3,698 -9.12 7,635 -8.81 4.5446
2018-10-03 2018-03-31 13F THERMO FISHER SCIENTIFIC COMMON 883556102 40,556 -764 -1.85 8,373 6.72 5.3843
2018-01-12 2017-12-31 13F THERMO FISHER SCIENTIFIC COMMON 883556102 41,320 -5,370 -11.50 7,846 -11.18 4.1899
2018-01-12 2017-09-30 13F THERMO FISHER SCIENTIFIC COMMON 883556102 46,690 -775 -1.63 8,834 6.68 4.4240
2018-01-22 2017-06-30 13F THERMO FISHER SCIENTIFIC COMMON 883556102 47,465 -1,900 -3.85 8,281 9.22 4.3062
2017-04-20 2017-03-31 13F THERMO FISHER SCIENTIFIC COMMON 883556102 49,365 -900 -1.79 7,582 6.89 3.8961
2017-04-20 2016-12-31 13F THERMO FISHER SCIENTIFIC COMMON 883556102 50,265 235 0.47 7,093 -10.87 3.7278
2016-11-01 2016-09-30 13F THERMO FISHER SCIENTIFIC COMMON 883556102 50,030 315 0.63 7,958 8.33 4.0719
2016-11-01 2016-06-30 13F THERMO FISHER SCIENTIFIC COMMON 883556102 49,715 202 0.41 7,346 4.78 3.3195
2016-06-01 2016-03-31 13F THERMO FISHER SCIENTIFIC COMMON 883556102 49,513 440 0.90 7,011 0.72 2.2565
2016-04-07 2015-12-31 13F THERMO FISHER SCIENTIFIC COMMON 883556102 49,073 -4,110 -7.73 6,961 7.04 2.1010
2015-12-22 2015-09-30 13F THERMO FISHER SCIENTIFIC COMMON 883556102 53,183 -930 -1.72 6,503 -7.39 1.5482
2015-08-31 2015-06-30 13F/A-1 THERMO FISHER SCIENTIFIC COMMON 883556102 51,493 -645 6,076 1.1638
2015-09-10 2015-06-30 13F/A-2 THERMO FISHER SCIENTIFIC COMMON 883556102 54,113 1,975 3.79 7,022 0.26 1.5716
2015-08-28 2015-06-30 13F THERMO FISHER SCIENTIFIC COMMON 883556102 51,493 6,076
2015-05-29 2015-03-31 13F THERMO FISHER SCIENTIFIC COMMON 883556102 52,138 1,245 2.45 7,004 9.85 1.5079
2015-05-29 2014-12-31 13F THERMO FISHER SCIENTIFIC COMMON 883556102 50,893 -710 -1.38 6,376 1.53 1.3122
2014-12-16 2014-09-30 13F THERMO FISHER SCIENTIFIC COMMON 883556102 51,603 110 0.21 6,280 3.36 1.2531
2014-09-04 2014-06-30 13F THERMO FISHER SCIENTIFIC COMMON 883556102 51,493 1,320 2.63 6,076 0.71 1.1862
2014-07-08 2014-03-31 13F THERMO FISHER SCIENTIFIC COMMON 883556102 50,173 5,138 11.41 6,033 20.30 1.2255
2014-03-24 2013-12-31 13F THERMO FISHER SCIENTIFIC COMMON 883556102 45,035 1,290 2.95 5,015 24.38 1.1870
2013-11-14 2013-09-30 13F THERMO FISHER SCIENTIFIC COMMON 883556102 43,745 5,760 15.16 4,032 25.41 0.8359
2013-11-14 2013-06-30 13F THERMO FISHER SCIENTIFIC COMMON 883556102 37,985 37,985 3,215 0.8436
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.