Thermo Fisher Scientific Inc.
US ˙ NYSE ˙ US8835561023

SecurityTMO / Thermo Fisher Scientific Inc.
InstitutionSei Investments Co
Latest Disclosed Ownership210,044 shares
Latest Disclosed Value $ 121,716,844
Sei Investments Co reports 37.65% increase in ownership of TMO / Thermo Fisher Scientific Inc.

On February 13, 2026 - Sei Investments Co filed a 13F-HR form disclosing ownership of 210,044 shares of Thermo Fisher Scientific Inc. (US:TMO) valued at $121,709,996 USD as of December 31, 2025. The entity filed a previous 13F-HR on November 13, 2025 disclosing 152,589 shares of Thermo Fisher Scientific Inc.. This represents a change in shares of 37.65% during the quarter. The current value of the position is $99,550,354 USD.

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)
2026-02-13 2025-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 210,044 57,455 37.65 121,717 64.43 0.1201
2025-11-13 2025-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 152,589 -64,087 -29.58 74,025 -15.75 0.0796
2025-08-14 2025-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 216,676 -41,761 -16.16 87,859 -31.68 0.1018
2025-05-14 2025-03-31 13F/A-1 THERMO FISHER SCIENTIFIC COM 883556102 258,437 6,435 2.55 128,607 -1.90 0.1655
2025-05-13 2025-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 257,227 5,225 132,798 0.1444
2025-02-11 2024-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 252,002 -31,071 -10.98 131,093 -25.13 0.1684
2024-11-12 2024-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 283,073 7,929 2.88 175,104 15.08 0.2274
2024-08-13 2024-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 275,144 1,598 0.58 152,160 -4.29 0.2156
2024-05-07 2024-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 273,546 -48,978 -15.19 158,981 -7.13 0.2329
2024-02-14 2023-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 322,524 64,741 25.11 171,184 31.20 0.2748
2023-11-14 2023-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 257,783 -16,995 -6.18 130,480 -8.99 0.2345
2023-08-11 2023-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 274,778 -16,978 -5.82 143,368 -14.74 0.2501
2023-05-12 2023-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 291,756 38,076 15.01 168,162 20.39 0.3124
2023-02-10 2022-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 253,680 40,315 18.89 139,686 29.08 0.3104
2022-11-14 2022-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 213,365 4,520 2.16 108,213 -5.23 0.2414
2022-08-15 2022-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 208,845 33,082 18.82 114,185 9.44 0.2466
2022-05-13 2022-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 175,763 10,416 6.30 104,332 -5.49 0.2097
2022-02-14 2021-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 165,347 9,071 5.80 110,393 23.13 0.2071
2021-11-12 2021-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 156,276 51,905 49.73 89,654 66.99 0.1881
2021-08-06 2021-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 104,371 14,723 16.42 53,688 31.28 0.1190
2021-05-12 2021-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 89,648 -1,711 -1.87 40,895 -3.44 0.1030
2021-02-08 2020-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 91,359 -59,783 -39.55 42,351 -36.62 0.1095
2020-12-04 2020-09-30 13F/A-1 THERMO FISHER SCIENTIFIC COM 883556102 151,142 -1,560 -1.02 66,816 20.97 0.1935
2020-11-06 2020-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 154,717 2,015 68,394 164,677.5454
2020-08-17 2020-06-30 13F/A-1 THERMO FISHER SCIENTIFIC COM 883556102 152,702 -4,622 -2.94 55,235 23.82 0.1714
2020-08-11 2020-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 162,744 5,420 53,624 145,457.9544
2020-05-14 2020-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 157,324 -1,180 -0.74 44,608 -13.57 0.1638
2020-02-06 2019-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 158,504 -23,715 -13.01 51,609 -2.70 0.1539
2019-11-12 2019-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 182,219 -3,992 -2.14 53,041 -3.02 0.1357
2019-08-14 2019-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 186,211 -21,156 -10.20 54,692 -3.76 0.1786
2019-05-15 2019-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 207,367 4,853 2.40 56,828 15.99 0.1908
2019-02-13 2018-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 202,514 5,732 2.91 48,994 2.37 0.1744
2018-11-08 2018-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 196,782 -27,141 -12.12 47,860 3.19 0.1735
2018-08-03 2018-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 223,923 5,523 2.53 46,382 2.86 0.1576
2018-05-11 2018-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 218,400 -30,704 -12.33 45,092 -4.67 0.1728
2018-02-08 2017-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 249,104 -12,815 -4.89 47,303 -4.55 0.1643
2017-11-06 2017-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 261,919 28,541 12.23 49,556 21.71 0.1761
2017-07-31 2017-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 233,378 -32,337 -12.17 40,718 -0.24 0.1623
2017-05-05 2017-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 265,715 17,134 6.89 40,814 16.36 0.1789
2017-02-02 2016-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 248,581 -19,402 -7.24 35,075 -17.71 0.1698
2016-11-04 2016-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 267,983 141,279 111.50 42,625 127.67 0.2165
2016-08-11 2016-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 126,704 -13,685 -9.75 18,722 -5.81 0.1123
2016-05-10 2016-03-31 13F/A-1 THERMO FISHER SCIENTIFIC COM 883556102 140,389 -543 -0.39 19,877 -0.58 0.1237
2016-02-03 2015-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 140,932 89,797 175.61 19,992 219.72 0.1218
2015-11-02 2015-09-30 13F/A-1 THERMO FISHER SCIENTIFIC COM 883556102 51,135 1,655 3.34 6,253 -2.62 0.0574
2015-10-30 2015-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 51,135 6,253
2015-08-07 2015-06-30 13F/A-1 THERMO FISHER SCIENTIFIC COM 883556102 49,480 -3,802 -7.14 6,421 -10.23 0.0580
2015-08-04 2015-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 49,480 -3,802 6,421 0.0580
2015-05-14 2015-03-31 13F/A-1 THERMO FISHER SCIENTIFIC COM 883556102 53,282 -82,436 -60.74 7,153 -57.96 0.0621
2015-05-01 2015-03-31 13F THERAVANCE NOTE 2.125% 1/1 883556102 53,282 7,153
2015-02-10 2014-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 135,718 135,718 17,014 0.1504
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.