Thermo Fisher Scientific Inc.
MX ˙ BMV ˙ US8835561023
SecurityMX:TMO / Thermo Fisher Scientific Inc.
InstitutionCastle Rock Wealth Management, LLC
Latest Disclosed Ownership3,701 shares
Latest Disclosed Value $ 1,818,705
Castle Rock Wealth Management, LLC reports 0.93% increase in ownership of TMO / Thermo Fisher Scientific Inc.

On April 8, 2026 - Castle Rock Wealth Management, LLC filed a 13F-HR form disclosing ownership of 3,701 shares of Thermo Fisher Scientific Inc. (MX:TMO) valued at $1,818,705 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 5, 2026 disclosing 3,667 shares of Thermo Fisher Scientific Inc.. This represents a change in shares of 0.93% 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.

Upgrade to unlock premium data and export to Excel .

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)
2026-04-08 2026-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 3,701 34 0.93 1,819 -13.01 0.3937
2026-02-05 2025-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 3,667 76 2.12 2,091 10.93 0.4521
2025-10-16 2025-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 3,591 46 1.30 1,885 29.31 0.4166
2025-07-23 2025-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 3,545 347 10.85 1,457 -6.66 0.3406
2025-04-09 2025-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 3,198 -131 -3.94 1,561 -11.81 0.4215
2025-03-05 2024-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 3,329 167 5.28 1,771 -6.25 0.4217
2024-10-09 2024-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 3,162 57 1.84 1,889 12.25 0.4506
2024-07-12 2024-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 3,105 115 3.85 1,682 -2.15 0.4201
2024-05-13 2024-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 2,990 1,189 66.02 1,719 79.81 0.4695
2024-01-09 2023-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,801 161 9.82 956 16.73 0.2898
2023-10-11 2023-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 1,640 43 2.69 819 -1.44 0.2750
2023-07-11 2023-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 1,597 66 4.31 831 1.59 0.2840
2023-05-12 2023-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,531 22 1.46 819 -6.08 0.2924
2023-01-31 2022-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,509 30 2.03 871 17.54 0.3894
2022-10-14 2022-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 1,479 -18 -1.20 741 -10.62 0.3734
2022-07-13 2022-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 1,497 -284 -15.95 829 -18.96 0.4229
2022-04-25 2022-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,781 -1,651 -48.11 1,023 -48.64 0.4706
2022-02-02 2021-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 3,432 -22 -0.64 1,992 -7.65 0.8123
2021-11-12 2021-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 3,454 191 5.85 2,157 22.35 0.7384
2021-08-13 2021-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 3,263 364 12.56 1,763 25.57 0.6467
2021-04-27 2021-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 2,899 244 9.19 1,404 2.78 0.5658
2021-01-29 2020-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 2,655 298 12.64 1,366 23.62 0.5679
2020-12-07 2020-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 2,357 1,067 82.71 1,105 106.16 0.7242
2020-08-10 2020-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 1,290 1,290 536 0.3140
2020-05-15 2020-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 0 -4,130 -100.00 0 -100.00
2020-02-13 2019-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 4,130 4,130 1,395 1.2569
2019-11-13 2019-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 0 -800 -100.00 0 -100.00
2019-08-08 2019-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 800 800 236 0.2619
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.