Thermo Fisher Scientific Inc.
MX ˙ BMV ˙ US8835561023
SecurityMX:TMO / Thermo Fisher Scientific Inc.
InstitutionPrincipal Securities, Inc.
Latest Disclosed Ownership12,642 shares
Latest Disclosed Value $ 6,213,758
Principal Securities, Inc. reports 37.68% increase in ownership of TMO / Thermo Fisher Scientific Inc.

On May 13, 2026 - Principal Securities, Inc. filed a 13F-HR form disclosing ownership of 12,642 shares of Thermo Fisher Scientific Inc. (MX:TMO) valued at $6,213,758 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 9,182 shares of Thermo Fisher Scientific Inc.. This represents a change in shares of 37.68% 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)
2026-05-13 2026-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 12,642 3,460 37.68 6,214 16.79 0.0911
2026-02-12 2025-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 9,182 798 9.52 5,320 30.84 0.0821
2025-11-12 2025-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 8,384 -1,988 -19.17 4,066 -3.31 0.0670
2025-08-11 2025-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 10,372 1,314 14.51 4,205 -10.76 0.0790
2025-04-30 2025-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 9,058 0 0.00 4,712 0.00 0.1054
2025-01-30 2024-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 9,058 766 9.24 4,712 -8.13 0.1061
2024-10-28 2024-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 8,292 1,982 31.41 5,129 47.00 0.1240
2024-07-31 2024-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 6,310 1,860 41.80 3,489 34.92 0.0962
2024-05-10 2024-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 4,450 812 22.32 2,586 33.92 0.0806
2024-05-10 2023-12-31 13F/A-1 THERMO FISHER SCIENTIFIC COM 883556102 3,638 3,638 1,931 0.0719
2024-02-07 2023-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 3,638 3,638 1,931 0.0719
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.