Thermo Fisher Scientific Inc.
MX ˙ BMV ˙ US8835561023
SecurityMX:TMO / Thermo Fisher Scientific Inc.
InstitutionAureus Asset Management, LLC
Latest Disclosed Ownership76,103 shares
Latest Disclosed Value $ 37,407,001
Aureus Asset Management, LLC reports 0.95% decrease in ownership of TMO / Thermo Fisher Scientific Inc.

On May 13, 2026 - Aureus Asset Management, LLC filed a 13F-HR form disclosing ownership of 76,103 shares of Thermo Fisher Scientific Inc. (MX:TMO) valued at $37,407,001 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 76,833 shares of Thermo Fisher Scientific Inc.. This represents a change in shares of -0.95% 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 Stock 883556102 76,103 -730 -0.95 37,407 -15.98 2.4917
2026-02-17 2025-12-31 13F Thermo Fisher Scientific Stock 883556102 76,833 -250 -0.32 44,521 19.08 2.8360
2025-11-17 2025-09-30 13F Thermo Fisher Scientific Stock 883556102 77,083 -1,188 -1.52 37,387 17.81 2.4344
2025-08-14 2025-06-30 13F Thermo Fisher Scientific Stock 883556102 78,271 21,784 38.56 31,736 12.91 2.0301
2025-05-15 2025-03-31 13F Thermo Fisher Scientific Stock 883556102 56,487 -495 -0.87 28,108 -5.18 1.9695
2025-02-14 2024-12-31 13F Thermo Fisher Scientific Stock 883556102 56,982 -945 -1.63 29,644 -17.27 1.9153
2024-11-14 2024-09-30 13F Thermo Fisher Scientific Stock 883556102 57,927 -477 -0.82 35,832 10.94 2.3440
2024-08-13 2024-06-30 13F Thermo Fisher Scientific Stock 883556102 58,404 -910 -1.53 32,297 -6.31 2.2573
2024-05-13 2024-03-31 13F Thermo Fisher Scientific Stock 883556102 59,314 -11 -0.02 34,474 9.48 2.3534
2024-02-14 2023-12-31 13F Thermo Fisher Scientific Stock 883556102 59,325 -757 -1.26 31,489 3.54 2.3029
2023-11-13 2023-09-30 13F Thermo Fisher Scientific Stock 883556102 60,082 -2,070 -3.33 30,412 -6.22 2.4426
2023-08-11 2023-06-30 13F Thermo Fisher Scientific Stock 883556102 62,152 11,177 21.93 32,428 10.37 2.4305
2023-05-12 2023-03-31 13F Thermo Fisher Scientific Stock 883556102 50,975 30 0.06 29,380 4.73 2.3242
2023-02-14 2022-12-31 13F Thermo Fisher Scientific Stock 883556102 50,945 291 0.57 28,055 9.20 2.4229
2022-11-14 2022-09-30 13F Thermo Fisher Scientific Stock 883556102 50,654 -958 -1.86 25,691 -8.38 2.2378
2022-08-15 2022-06-30 13F Thermo Fisher Scientific Stock 883556102 51,612 135 0.26 28,040 -7.78 2.2627
2022-05-12 2022-03-31 13F Thermo Fisher Scientific Stock 883556102 51,477 -18,477 -26.41 30,405 -34.86 2.0205
2022-02-14 2021-12-31 13F Thermo Fisher Scientific Stock 883556102 69,954 -895 -1.26 46,676 15.31 2.8818
2021-11-12 2021-09-30 13F Thermo Fisher Scientific Stock 883556102 70,849 1,577 2.28 40,478 15.83 2.6625
2021-08-16 2021-06-30 13F Thermo Fisher Scientific Stock 883556102 69,272 2,249 3.36 34,946 14.25 2.2456
2021-05-14 2021-03-31 13F Thermo Fisher Scientific Stock 883556102 67,023 2,821 4.39 30,588 2.29 2.3734
2021-02-16 2020-12-31 13F Thermo Fisher Scientific Stock 883556102 64,202 591 0.93 29,904 6.47 2.5194
2020-11-13 2020-09-30 13F Thermo Fisher Scientific Stock 883556102 63,611 2,354 3.84 28,086 26.54 2.6577
2020-08-11 2020-06-30 13F Thermo Fisher Scientific Stock 883556102 61,257 986 1.64 22,196 29.85 2.4204
2020-05-14 2020-03-31 13F Thermo Fisher Scientific Stock 883556102 60,271 240 0.40 17,093 -12.35 2.3707
2020-02-12 2019-12-31 13F Thermo Fisher Scientific Stock 883556102 60,031 572 0.96 19,502 12.60 2.1787
2019-11-12 2019-09-30 13F Thermo Fisher Scientific Stock 883556102 59,459 -497 -0.83 17,319 -1.64 2.1556
2019-08-14 2019-06-30 13F Thermo Fisher Scientific Stock 883556102 59,956 1,550 2.65 17,608 10.14 2.1684
2019-05-13 2019-03-31 13F Thermo Fisher Scientific Stock 883556102 58,406 2,887 5.20 15,987 28.67 2.1176
2019-02-13 2018-12-31 13F Thermo Fisher Scientific Stock 883556102 55,519 -6,553 -10.56 12,425 -17.99 1.9534
2018-11-14 2018-09-30 13F Thermo Fisher Scientific Stock 883556102 62,072 -400 -0.64 15,150 17.08 1.9263
2018-08-13 2018-06-30 13F Thermo Fisher Scientific Stock 883556102 62,472 3,170 5.35 12,940 5.69 1.7782
2018-05-15 2018-03-31 13F Thermo Fisher Scientific Stock 883556102 59,302 1,682 2.92 12,243 11.90 1.8393
2018-02-14 2017-12-31 13F Thermo Fisher Scientific Stock 883556102 57,620 299 0.52 10,941 0.89 1.6938
2017-11-13 2017-09-30 13F THERMO FISHER SCIENTIFIC INC COM Stock 883556102 57,321 -29,101 -33.67 10,845 -28.07 1.7150
2017-08-14 2017-06-30 13F THERMO FISHER SCIENTIFIC INC COM Stock 883556102 86,422 -20,920 -19.49 15,078 -17.86 2.5353
2017-05-12 2017-03-31 13F THERMO FISHER SCIENTIFIC INC COM Stock 883556102 107,342 -1,305 -1.20 18,357 19.75 3.1861
2017-02-14 2016-12-31 13F THERMO FISHER SCIENTIFIC INC COM Stock 883556102 108,647 4,650 4.47 15,330 -7.33 3.0035
2016-11-14 2016-09-30 13F THERMO FISHER SCIENTIFIC INC COM Stock 883556102 103,997 -397 -0.38 16,542 7.24 3.3094
2016-08-15 2016-06-30 13F/A-1 THERMO FISHER SCIENTIFIC COM 883556102 104,394 4,375 4.37 15,425 8.92 3.3213
2016-08-15 2016-06-30 13F SPDR S&P 500 ETF TRUST COM 883556102 1,331 279
2016-05-13 2016-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 100,019 2,380 2.44 14,162 2.25 3.0939
2016-02-16 2015-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 97,639 9,488 10.76 13,850 28.49 3.1098
2015-11-13 2015-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 88,151 1,781 2.06 10,779 -3.82 2.6808
2015-08-12 2015-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 86,370 6,120 7.63 11,207 3.95 2.3559
2015-05-13 2015-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 80,250 5,200 6.93 10,781 14.65 2.4789
2015-02-12 2014-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 75,050 10,490 16.25 9,403 19.68 2.2863
2014-11-14 2014-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 64,560 61,020 1,723.73 7,857 1,779.67 1.9715
2014-08-08 2014-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 3,540 -350 -9.00 418 -10.68 0.1045
2014-05-06 2014-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 3,890 3,890 468 0.1202
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.