Thermo Fisher Scientific Inc.
MX ˙ BMV ˙ US8835561023
SecurityMX:TMO / Thermo Fisher Scientific Inc.
InstitutionCalamos Wealth Management LLC
Latest Disclosed Ownership2,091 shares
Latest Disclosed Value $ 1,027,789
Calamos Wealth Management LLC reports 8.45% increase in ownership of TMO / Thermo Fisher Scientific Inc.

On May 4, 2026 - Calamos Wealth Management LLC filed a 13F-HR form disclosing ownership of 2,091 shares of Thermo Fisher Scientific Inc. (MX:TMO) valued at $1,027,789 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 29, 2026 disclosing 1,928 shares of Thermo Fisher Scientific Inc.. This represents a change in shares of 8.45% 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)
2026-05-04 2026-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 2,091 163 8.45 1,028 -8.06 0.0354
2026-01-29 2025-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,928 443 29.83 1,117 55.14 0.0385
2025-10-20 2025-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 1,485 262 21.42 720 45.45 0.0260
2025-07-29 2025-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 1,223 -376 -23.51 496 -37.74 0.0210
2025-04-29 2025-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,599 -38 -2.32 796 -6.58 0.0397
2025-01-24 2024-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,637 -18,727 -91.96 852 -93.24 0.0426
2024-11-12 2024-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 20,364 30 0.15 12,597 12.02 0.6453
2024-07-25 2024-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 20,334 334 1.67 11,245 -3.27 0.5991
2024-05-08 2024-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 20,000 18,309 1,082.73 11,624 1,195.88 0.6524
2024-01-31 2023-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,691 -16,723 -90.82 898 -90.38 0.0565
2023-10-26 2023-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 18,414 69 0.38 9,321 -2.62 0.7065
2023-07-28 2023-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 18,345 -575 -3.04 9,572 -12.22 0.7016
2023-05-04 2023-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 18,920 16,015 551.29 10,905 581.93 0.8543
2023-01-26 2022-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 2,905 -88 -2.94 1,600 5.34 0.1242
2022-10-24 2022-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 2,993 -62 -2.03 1,518 -8.55 0.1302
2022-08-01 2022-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 3,055 40 1.33 1,660 -6.79 0.1473
2022-05-03 2022-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 3,015 146 5.09 1,781 -6.95 0.1331
2022-02-01 2021-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 2,869 -98 -3.30 1,914 12.92 0.1399
2021-10-26 2021-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 2,967 -63 -2.08 1,695 10.86 0.1370
2021-07-22 2021-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 3,030 -10,514 -77.63 1,529 -75.26 0.1191
2021-04-12 2021-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 13,544 -5,116 -27.42 6,181 -28.88 0.5095
2021-01-27 2020-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 18,660 1,109 6.32 8,691 12.16 0.7934
2020-10-26 2020-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 17,551 1,213 7.42 7,749 30.90 0.8864
2020-07-27 2020-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 16,338 1,602 10.87 5,920 41.66 0.7387
2020-04-28 2020-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 14,736 13,976 1,838.95 4,179 1,591.90 0.6372
2020-01-15 2019-12-31 13F THERMO FISHER SCIENTIFIC COMMON STOCK 883556102 760 0 0.00 247 11.76 0.0291
2019-10-21 2019-09-30 13F THERMO FISHER SCIENTIFIC COMMON STOCK 883556102 760 0 0.00 221 -0.90 0.0295
2019-08-07 2019-06-30 13F THERMO FISHER SCIENTIFIC COMMON STOCK 883556102 760 0 0.00 223 7.21 0.0301
2019-04-12 2019-03-31 13F THERMO FISHER SCIENTIFIC COMMON STOCK 883556102 760 760 208 0.0297
2018-04-13 2018-03-31 13F THERMO FISHER SCIENTIFIC COMMON STOCK 883556102 0 -14,337 -100.00 0 -100.00
2018-02-13 2017-12-31 13F THERMO FISHER SCIENTIFIC COMMON STOCK 883556102 14,337 -1,675 -10.46 2,722 -10.14 0.3532
2017-10-25 2017-09-30 13F THERMO FISHER SCIENTIFIC COMMON STOCK 883556102 16,012 136 0.86 3,029 9.35 0.4197
2017-08-09 2017-06-30 13F THERMO FISHER SCIENTIFIC COMMON STOCK 883556102 15,876 184 1.17 2,770 14.94 0.3919
2017-04-20 2017-03-31 13F THERMO FISHER SCIENTIFIC COMMON STOCK 883556102 15,692 3,400 27.66 2,410 38.99 0.3603
2017-02-06 2016-12-31 13F THERMO FISHER SCIENTIFIC COMMON STOCK 883556102 12,292 -11,056 -47.35 1,734 -53.31 0.2791
2016-11-14 2016-09-30 13F THERMO FISHER SCIENTIFIC COMMON STOCK 883556102 23,348 2,047 9.61 3,714 18.02 0.6348
2016-07-26 2016-06-30 13F THERMO FISHER SCIENTIFIC COMMON STOCK 883556102 21,301 12,765 149.54 3,147 160.30 0.5561
2016-04-25 2016-03-31 13F THERMO FISHER SCIENTIFIC COMMON STOCK 883556102 8,536 1,546 22.12 1,209 21.88 0.2327
2016-02-05 2015-12-31 13F THERMO FISHER SCIENTIFIC COMMON STOCK 883556102 6,990 6,990 992 0.1976
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.