Thermo Fisher Scientific Inc.
MX ˙ BMV ˙ US8835561023
SecurityMX:TMO / Thermo Fisher Scientific Inc.
InstitutionMassmutual Trust Co Fsb/adv
Latest Disclosed Ownership53,163 shares
Latest Disclosed Value $ 26,131,209
Massmutual Trust Co Fsb/adv reports 0.77% decrease in ownership of TMO / Thermo Fisher Scientific Inc.

On April 13, 2026 - Massmutual Trust Co Fsb/adv filed a 13F-HR form disclosing ownership of 53,163 shares of Thermo Fisher Scientific Inc. (MX:TMO) valued at $26,131,209 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 7, 2026 disclosing 53,574 shares of Thermo Fisher Scientific Inc.. This represents a change in shares of -0.77% 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)
2026-04-13 2026-03-31 13F Thermo Fisher Scientific Common / Ordinary Stock 883556102 53,163 -411 -0.77 26,131 -15.82 0.7116
2026-01-07 2025-12-31 13F Thermo Fisher Scientific Common / Ordinary Stock 883556102 53,574 -720 -1.33 31,043 17.89 0.7989
2025-10-22 2025-09-30 13F Thermo Fisher Scientific Common / Ordinary Stock 883556102 54,294 1,150 2.16 26,334 22.21 0.6707
2025-07-09 2025-06-30 13F Thermo Fisher Scientific Common / Ordinary Stock 883556102 53,144 1,384 2.67 21,548 -16.34 0.5741
2025-04-01 2025-03-31 13F Thermo Fisher Scientific Common / Ordinary Stock 883556102 51,760 3,829 7.99 25,756 3.29 0.7450
2025-01-16 2024-12-31 13F Thermo Fisher Scientific Common / Ordinary Stock 883556102 47,931 -3,514 -6.83 24,935 -21.64 0.6995
2024-10-02 2024-09-30 13F Thermo Fisher Scientific Common / Ordinary Stock 883556102 51,445 1,146 2.28 31,822 14.41 0.9063
2024-07-02 2024-06-30 13F Thermo Fisher Scientific Common / Ordinary Stock 883556102 50,299 85 0.17 27,815 -4.69 0.8439
2024-04-09 2024-03-31 13F Thermo Fisher Scientific Common / Ordinary Stock 883556102 50,214 2,385 4.99 29,185 14.96 0.9081
2024-01-03 2023-12-31 13F Thermo Fisher Scientific Common / Ordinary Stock 883556102 47,829 -601 -1.24 25,387 3.57 0.8517
2023-10-04 2023-09-30 13F Thermo Fisher Scientific Common / Ordinary Stock 883556102 48,430 866 1.82 24,514 -1.22 0.9052
2023-08-02 2023-06-30 13F Thermo Fisher Scientific Common / Ordinary Stock 883556102 47,564 -3,180 -6.27 24,817 -15.15 0.8925
2023-04-11 2023-03-31 13F Thermo Fisher Scientific Common / Ordinary Stock 883556102 50,744 716 1.43 29,247 108,222.22 1.1179
2023-01-06 2022-12-31 13F Thermo Fisher Scientific Common / Ordinary Stock 883556102 50,028 137 0.27 28 8.00 1.1333
2022-10-07 2022-09-30 13F Thermo Fisher Scientific Common / Ordinary Stock 883556102 49,891 836 1.70 25 -3.85 1.1483
2022-07-07 2022-06-30 13F Thermo Fisher Scientific Common / Ordinary Stock 883556102 49,055 2,108 4.49 27 -3.70 1.1542
2022-04-08 2022-03-31 13F Thermo Fisher Scientific Common / Ordinary Stock 883556102 46,947 655 1.41 28 -10.00 1.0482
2022-02-09 2021-12-31 13F Thermo Fisher Scientific Common / Ordinary Stock 883556102 46,292 1,126 2.49 31 20.00 1.1470
2021-11-12 2021-09-30 13F Thermo Fisher Scientific Common / Ordinary Stock 883556102 45,166 2,770 6.53 26 19.05 1.0669
2021-08-16 2021-06-30 13F Thermo Fisher Scientific Common / Ordinary Stock 883556102 42,396 4,417 11.63 21 23.53 0.9084
2021-05-17 2021-03-31 13F Thermo Fisher Scientific Common / Ordinary Stock 883556102 37,979 2,586 7.31 17 6.25 0.8152
2021-02-16 2020-12-31 13F Thermo Fisher Scientific Common / Ordinary Stock 883556102 35,393 1,037 3.02 16 6.67 0.8441
2020-11-13 2020-09-30 13F Thermo Fisher Scientific Common / Ordinary Stock 883556102 34,356 -426 -1.22 15 -99.88 0.8867
2020-08-13 2020-06-30 13F Thermo Fisher Scientific Common / Ordinary Stock 883556102 34,782 2,829 8.85 12,603 39.08 0.8122
2020-05-15 2020-03-31 13F Thermo Fisher Scientific Common / Ordinary Stock 883556102 31,953 5,487 20.73 9,062 5.40 0.7235
2020-05-15 2019-12-31 13F Thermo Fisher Scientific Common / Ordinary Stock 883556102 26,466 781 3.04 8,598 14.93 0.5311
2019-11-14 2019-09-30 13F Thermo Fisher Scientific Common / Ordinary Stock 883556102 25,685 481 1.91 7,481 1.07 0.5010
2019-08-14 2019-06-30 13F Thermo Fisher Scientific Common / Ordinary Stock 883556102 25,204 4,297 20.55 7,402 29.36 0.5118
2019-05-15 2019-03-31 13F Thermo Fisher Scientific Common / Ordinary Stock 883556102 20,907 5,128 32.50 5,723 62.05 0.4127
2019-02-26 2018-12-31 13F Thermo Fisher Scientific Common / Ordinary Stock 883556102 15,779 320 2.07 3,531 -6.41 0.3022
2018-11-09 2018-09-30 13F Thermo Fisher Scientific Common / Ordinary Stock 883556102 15,459 2,420 18.56 3,773 39.74 0.2800
2018-08-20 2018-06-30 13F Thermo Fisher Scientific Common / Ordinary Stock 883556102 13,039 12,834 6,260.49 2,701 6,328.57 0.2156
2018-05-21 2018-03-31 13F Thermo Fisher Scientific Common / Ordinary Stock 883556102 205 -25 -10.87 42 -2.33 0.0035
2018-03-01 2017-12-31 13F/A-1 Thermo Fisher Scientific Common / Ordinary Stock 883556102 230 125 119.05 44 126.32 0.0036
2018-02-21 2017-12-31 13F Coca-Cola European Partners Common / Ordinary Stock 883556102 850 745 34
2018-02-13 2017-09-30 13F Thermo Fisher Scientific common 883556102 105 0 0.00 20 5.56 0.0016
2017-08-14 2017-06-30 13F Thermo Fisher Scientific common 883556102 105 35 50.00 18 80.00 0.0016
2017-05-02 2017-03-31 13F Thermo Fisher Scientific common 883556102 70 -285 -80.28 11 -80.00 0.0010
2017-02-13 2016-12-31 13F Thermo Fisher Scientific common 883556102 355 234 193.39 50 194.12 0.0061
2016-08-10 2016-06-30 13F THERMO FISHER SCIENTIFIC common 883556102 121 -67 -35.64 18 -34.62 0.0023
2016-05-10 2016-03-31 13F THERMO FISHER SCIENTIFIC common 883556102 188 -337 -64.19 27 -64.86 0.0036
2016-02-12 2015-12-31 13F THERMO FISHER SCIENTIFIC common 883556102 525 177 50.86 74 76.19 0.0107
2015-11-04 2015-09-30 13F THERMO FISHER SCIENTIFIC common 883556102 348 143 69.76 42 75.00 0.0089
2015-07-29 2015-06-30 13F THERMO FISHER SCIENTIFIC common 883556102 205 -143 -41.09 24 -47.83 0.0054
2015-05-11 2015-03-31 13F THERMO FISHER SCIENTIFIC common 883556102 348 0 0.00 47 6.98 0.0077
2015-02-05 2014-12-31 13F THERMO FISHER SCIENTIFIC common 883556102 348 0 0.00 44 2.38 0.0141
2014-11-04 2014-09-30 13F THERMO FISHER SCIENTIFIC COMMON STOCK 883556102 348 143 69.76 42 75.00 0.0084
2014-07-09 2014-06-30 13F THERMO FISHER SCIENTIFIC COMMON STOCK 883556102 205 0 0.00 24 0.00 0.0096
2014-05-15 2014-03-31 13F THERMO FISHER SCIENTIFIC common 883556102 205 -24 -10.48 25 -4.00 0.0144
2014-02-14 2013-12-31 13F/A-1 THERMO FISHER SCIENTIFIC COMMON STOCK 883556102 229 229 25 0.0235
2014-02-13 2013-12-31 13F THERMO FISHER SCIENTIFIC COMMON STOCK 883556102 229 25 0.0235
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.