Thermo Fisher Scientific Inc.
MX ˙ BMV ˙ US8835561023
SecurityMX:TMO / Thermo Fisher Scientific Inc.
InstitutionChevy Chase Trust Holdings, Inc.
Latest Disclosed Ownership310,001 shares
Latest Disclosed Value $ 152,374,976
Chevy Chase Trust Holdings, Inc. reports 3.17% increase in ownership of TMO / Thermo Fisher Scientific Inc.

On May 15, 2026 - Chevy Chase Trust Holdings, Inc. filed a 13F-HR form disclosing ownership of 310,001 shares of Thermo Fisher Scientific Inc. (MX:TMO) valued at $152,374,976 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 300,473 shares of Thermo Fisher Scientific Inc.. This represents a change in shares of 3.17% 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)
2026-05-15 2026-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 310,001 9,528 3.17 152,375 -12.48 0.3185
2026-02-13 2025-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 300,473 10,704 3.69 174,109 23.88 0.4703
2025-11-14 2025-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 289,769 17,687 6.50 140,544 27.40 0.3867
2025-07-29 2025-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 272,082 29,510 12.17 110,318 -8.60 0.3209
2025-04-23 2025-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 242,572 22,368 10.16 120,704 5.37 0.3860
2025-01-30 2024-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 220,204 -22,068 -9.11 114,557 -23.56 0.3488
2024-11-14 2024-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 242,272 32,397 15.44 149,862 29.12 0.4593
2024-07-22 2024-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 209,875 -5,970 -2.77 116,061 -7.49 0.3703
2024-05-03 2024-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 215,845 -1,755 -0.81 125,451 8.62 0.4106
2024-01-24 2023-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 217,600 -857 -0.39 115,500 4.45 0.4134
2023-10-23 2023-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 218,457 -4,922 -2.20 110,576 -5.12 0.4368
2023-07-25 2023-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 223,379 -6,439 -2.80 116,548 -12.01 0.4365
2023-05-17 2023-03-31 13F/A-1 THERMO FISHER SCIENTIFIC COM 883556102 229,818 1,557 0.68 132,460 5.38 0.5242
2023-05-16 2023-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 7,013 -221,248 4,042 0.5520
2023-02-09 2022-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 228,261 -12,984 -5.38 125,701 2.73 0.5343
2022-11-04 2022-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 241,245 2,129 0.89 122,357 -5.81 0.5225
2022-08-10 2022-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 239,116 -258 -0.11 129,907 -8.12 0.5372
2022-04-27 2022-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 239,374 381 0.16 141,386 -11.34 0.4872
2022-01-31 2021-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 238,993 -5,284 -2.16 159,465 14.26 0.5140
2021-10-20 2021-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 244,277 -9,058 -3.58 139,563 9.21 0.4863
2021-07-20 2021-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 253,335 -15,213 -5.66 127,799 4.27 0.4348
2021-04-22 2021-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 268,548 -20,656 -7.14 122,560 -9.02 0.4369
2021-02-12 2020-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 289,204 -7,370 -2.49 134,705 2.87 0.4801
2020-11-06 2020-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 296,574 -24,591 -7.66 130,943 12.52 0.5175
2020-08-14 2020-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 321,165 -22,860 -6.64 116,371 19.27 0.4719
2020-05-13 2020-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 344,025 5,315 1.57 97,566 -11.33 0.4541
2020-02-12 2019-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 338,710 1,132 0.34 110,037 11.91 0.4164
2019-11-20 2019-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 337,578 548 0.16 98,326 -0.66 0.4032
2019-08-14 2019-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 337,030 -1,823 -0.54 98,979 5.31 0.4102
2019-05-13 2019-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 338,853 4,471 1.34 93,985 25.60 0.3887
2019-02-14 2018-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 334,382 600 0.18 74,831 -8.15 0.3650
2018-10-23 2018-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 333,782 -7,893 -2.31 81,470 15.11 0.3378
2018-08-02 2018-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 341,675 -583 -0.17 70,775 0.16 0.3067
2018-04-10 2018-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 342,258 -7,888 -2.25 70,663 6.28 0.3140
2018-01-22 2017-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 350,146 -721 -0.21 66,486 0.15 0.2863
2017-11-14 2017-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 350,867 11,453 3.37 66,384 12.10 0.3007
2017-07-13 2017-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 339,414 1,300 0.38 59,218 14.02 0.2834
2017-04-05 2017-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 338,114 5,944 1.79 51,935 10.81 0.2549
2017-01-09 2016-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 332,170 1,284 0.39 46,869 -10.95 0.2484
2016-10-05 2016-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 330,886 -6,966 -2.06 52,630 5.43 0.2880
2016-07-08 2016-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 337,852 1,802 0.54 49,921 4.92 0.2782
2016-04-07 2016-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 336,050 5,301 1.60 47,582 1.42 0.2721
2016-01-15 2015-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 330,749 -20,828 -5.92 46,917 9.13 0.2752
2015-10-15 2015-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 351,577 11,103 3.26 42,991 -2.69 0.2684
2015-07-15 2015-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 340,474 -2,241 -0.65 44,180 -4.04 0.2646
2015-04-17 2015-03-31 13F/A-1 THERMO FISHER SCIENTIFIC COM 883556102 342,715 5,385 1.60 46,041 8.94 0.2777
2015-04-15 2015-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 342,715 46,041
2015-01-15 2014-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 337,330 -4,509 -1.32 42,264 1.59 0.2642
2014-10-17 2014-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 341,839 28,182 8.98 41,601 12.40 0.2693
2014-07-16 2014-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 313,657 -4,566 -1.43 37,011 -3.27 0.2574
2014-04-15 2014-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 318,223 4,181 1.33 38,263 9.42 0.2743
2014-01-23 2013-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 314,042 4,341 1.40 34,968 22.52 0.2555
2013-10-15 2013-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 309,701 6,662 2.20 28,540 11.28 0.2329
2013-07-18 2013-06-30 13F/A-2 THERMO FISHER SCIENTIFIC COM 883556102 303,039 303,039 25,646 0.2244
2013-07-18 2013-06-30 13F/A-1 THERMO FISHER SCIENTIFIC COM 883556102 55,287 -247,752 4,679 1.0110
2013-07-17 2013-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 55,287 4,679
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.