Thermo Fisher Scientific Inc.
MX ˙ BMV ˙ US8835561023
SecurityMX:TMO / Thermo Fisher Scientific Inc.
InstitutionAcadian Asset Management Llc
Latest Disclosed Ownership2,127 shares
Latest Disclosed Value $ 1,045
Acadian Asset Management Llc reports 34.09% decrease in ownership of TMO / Thermo Fisher Scientific Inc.

On May 13, 2026 - Acadian Asset Management Llc filed a 13F-HR form disclosing ownership of 2,127 shares of Thermo Fisher Scientific Inc. (MX:TMO) valued at $1,045 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 10, 2026 disclosing 3,227 shares of Thermo Fisher Scientific Inc.. This represents a change in shares of -34.09% 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 2,127 -1,100 -34.09 1 0.00 0.0015
2026-02-10 2025-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 3,227 843 35.36 2 0.00 0.0031
2025-11-13 2025-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 2,384 -2,513 -51.32 1 0.00 0.0020
2025-08-07 2025-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 4,897 -6,419 -56.72 2 -80.00 0.0041
2025-05-21 2025-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 11,316 -5,413 -32.36 6 -37.50 0.0159
2025-02-11 2024-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 16,729 -4,748 -22.11 9 -38.46 0.0252
2024-11-12 2024-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 21,477 3,440 19.07 13 44.44 0.0413
2024-08-06 2024-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 18,037 -6,543 -26.62 10 -35.71 0.0307
2024-05-10 2024-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 24,580 909 3.84 14 16.67 0.0498
2024-02-13 2023-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 23,671 17,180 264.67 13 300.00 0.0487
2023-11-13 2023-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 6,491 -932 -12.56 3 0.00 0.0138
2023-08-07 2023-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 7,423 -937 -11.21 4 -25.00 0.0159
2023-05-11 2023-03-31 13F THERMO FISHRSER SCIENTIFIC COM 883556102 8,360 -284 -3.29 5 0.00 0.0211
2023-02-14 2022-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 8,644 -434 -4.78 5 -99.91 0.0234
2022-11-14 2022-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 9,078 1,521 20.13 4,602 12.08 0.0252
2022-08-09 2022-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 7,557 -6,192 -45.04 4,106 -49.41 0.0210
2022-05-12 2022-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 13,749 -5,679 -29.23 8,116 -37.37 0.0335
2022-02-10 2021-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 19,428 -8,224 -29.74 12,959 -17.95 0.0484
2021-11-12 2021-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 27,652 -73,461 -72.65 15,794 -69.04 0.0602
2021-08-11 2021-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 101,113 -144,187 -58.78 51,010 -54.44 0.1920
2021-05-11 2021-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 245,300 27,356 12.55 111,952 10.28 0.4350
2021-02-11 2020-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 217,944 100,068 84.89 101,512 95.05 0.3925
2020-11-09 2020-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 117,876 107,818 1,071.96 52,043 1,327.79 0.2180
2020-08-12 2020-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 10,058 3,439 51.96 3,645 94.19 0.0157
2020-05-11 2020-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 6,619 3,703 126.99 1,877 98.20 0.0107
2020-02-06 2019-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 2,916 1,881 181.74 947 213.58 0.0043
2019-11-07 2019-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 1,035 -2,265 -68.64 302 -68.83 0.0013
2019-08-08 2019-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 3,300 -2,875 -46.56 969 -42.70 0.0047
2019-05-09 2019-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 6,175 -2,595 -29.59 1,691 -13.86 0.0073
2019-02-07 2018-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 8,770 7,748 758.12 1,963 688.35 0.0097
2018-10-30 2018-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 1,022 0 0.00 249 17.45 0.0010
2018-07-24 2018-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 1,022 0 0.00 212 0.47 0.0009
2018-04-12 2018-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,022 -686 -40.16 211 -34.88 0.0009
2018-01-18 2017-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,708 -1,520 -47.09 324 -46.97 0.0014
2017-10-13 2017-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 3,228 2,206 215.85 611 243.26 0.0027
2017-07-25 2017-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 1,022 0 0.00 178 13.38 0.0008
2017-04-25 2017-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,022 0 0.00 157 9.03 0.0007
2017-01-19 2016-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,022 1,022 144 0.0007
2016-04-14 2016-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 0 -64 -100.00 0 -100.00
2016-01-14 2015-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 64 -2 -3.03 9 12.50 0.0000
2015-10-15 2015-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 66 -53 -44.54 8 -50.00 0.0000
2015-08-11 2015-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 119 2 1.71 16 0.00 0.0001
2015-04-20 2015-03-31 13F/A-1 THERMO FISHER SCIENTIFIC COM 883556102 117 -1,450 -92.53 16 -91.88 0.0001
2015-01-23 2014-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,567 1,514 2,856.60 197 3,183.33 0.0009
2014-10-22 2014-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 53 53 6 0.0000
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.