Thermo Fisher Scientific Inc.
MX ˙ BMV ˙ US8835561023
SecurityMX:TMO / Thermo Fisher Scientific Inc.
InstitutionFisher Asset Management, LLC
Latest Disclosed Ownership2,851,579 shares
Latest Disclosed Value $ 1,401,637,491
Fisher Asset Management, LLC reports 2.12% increase in ownership of TMO / Thermo Fisher Scientific Inc.

On May 5, 2026 - Fisher Asset Management, LLC filed a 13F-HR form disclosing ownership of 2,851,579 shares of Thermo Fisher Scientific Inc. (MX:TMO) valued at $1,401,637,491 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 9, 2026 disclosing 2,792,421 shares of Thermo Fisher Scientific Inc.. This represents a change in shares of 2.12% 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)
2026-05-05 2026-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 2,851,579 59,158 2.12 1,401,637 -13.38 0.4753
2026-02-09 2025-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 2,792,421 71,320 2.62 1,618,069 22.60 0.5523
2025-11-12 2025-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 2,721,101 31,298 1.16 1,319,789 21.01 0.4777
2025-08-13 2025-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 2,689,803 -25,615 -0.94 1,090,608 -19.29 0.4330
2025-05-14 2025-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 2,715,418 49,516 1.86 1,351,193 -2.57 0.5849
2025-02-05 2024-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 2,665,902 29,344 1.11 1,386,883 -14.96 0.5518
2024-11-12 2024-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 2,636,558 65,586 2.55 1,630,896 14.71 0.6683
2024-08-14 2024-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 2,570,972 73,574 2.95 1,421,748 -2.05 0.6185
2024-05-09 2024-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 2,497,398 -74,268 -2.89 1,451,513 6.34 0.6779
2024-03-05 2023-12-31 13F/A-1 THERMO FISHER SCIENTIFIC COM 883556102 2,571,666 589 0.02 1,365,015 4.89 0.7217
2024-02-06 2023-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 2,572,994 1,917 1,365,720 0.6724
2023-11-13 2023-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 2,571,077 114,394 4.66 1,301,403 1.53 0.7381
2023-12-12 2023-06-30 13F/A-1 THERMO FISHER SCIENTIFIC COM 883556102 2,456,683 60,712 2.53 1,281,775 -7.19 0.7086
2023-08-08 2023-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 2,457,187 61,216 1,282 0.7084
2023-12-12 2023-03-31 13F/A-1 THERMO FISHER SCIENTIFIC COM 883556102 2,395,971 44,874 1.91 1,381,078 106,629.29 0.8388
2023-05-01 2023-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 2,395,840 44,743 1,381 0.8362
2023-02-03 2022-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 2,351,097 46,035 2.00 1,295 -99.89 0.8752
2022-11-08 2022-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 2,305,062 -35,752 -1.53 1,169,105 -8.07 0.8763
2022-08-09 2022-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 2,340,814 83,936 3.72 1,271,718 -4.60 0.9000
2022-05-05 2022-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 2,256,878 104,324 4.85 1,333,025 -7.19 0.7865
2022-02-02 2021-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 2,152,554 139,982 6.96 1,436,271 24.91 0.8043
2021-10-26 2021-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 2,012,572 86,150 4.47 1,149,843 18.32 0.7142
2021-07-27 2021-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 1,926,422 112,351 6.19 971,822 17.38 0.6102
2021-04-27 2021-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,814,071 82,766 4.78 827,906 2.67 0.5832
2021-01-29 2020-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,731,305 116,353 7.20 806,407 13.10 0.6042
2020-11-12 2020-09-30 13F/A-1 THERMO FISHER SCIENTIFIC COM 883556102 1,614,952 85,254 5.57 713,034 28.64 0.6241
2020-11-10 2020-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 1,614,952 85,254 713,034 605,488.8454
2020-08-07 2020-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 1,529,698 585,222 61.96 554,271 106.93 0.5410
2020-04-28 2020-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 944,476 942,774 55,392.13 267,853 48,336.35 0.3322
2020-02-12 2019-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,702 123 7.79 553 20.22 0.0006
2019-10-29 2019-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 1,579 668 73.33 460 71.64 0.0005
2019-07-30 2019-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 911 -57 -5.89 268 23.50 0.0003
2019-04-22 2019-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 968 0 0.00 217 0.00 0.0003
2019-01-25 2018-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 968 -825 -46.01 217 -50.46 0.0003
2018-10-23 2018-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 1,793 73 4.24 438 23.03 0.0005
2018-07-09 2018-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 1,720 -190 -9.95 356 -9.64 0.0005
2018-05-10 2018-03-31 13F/A-2 THERMO FISHER SCIENTIFIC COM 883556102 1,910 -160 -7.73 394 0.25 0.0005
2018-04-20 2018-03-31 13F/A-1 THERMO FISHER SCIENTIFIC COM 883556102 1,910 0 394 0.0005
2018-04-19 2018-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,910 -160 394
2018-01-24 2017-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 2,070 805 63.64 393 64.44 0.0005
2017-10-17 2017-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 1,265 -19 -1.48 239 6.70 0.0003
2017-07-12 2017-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 1,284 -1,318 -50.65 224 -44.00 0.0003
2017-04-24 2017-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 2,602 895 52.43 400 65.98 0.0006
2017-01-10 2016-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,707 225 15.18 241 2.12 0.0004
2016-10-11 2016-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 1,482 1,482 0.00 236 0.0004
2016-07-12 2016-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 0 -1,642 -100.00 0 -100.00
2016-04-18 2016-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,642 -225 -12.05 239 -9.81 0.0005
2016-01-14 2015-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,867 1,867 265 0.0005
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.