Thermo Fisher Scientific Inc.
MX ˙ BMV ˙ US8835561023
SecurityMX:TMO / Thermo Fisher Scientific Inc.
InstitutionFirst Pacific Advisors, LP
ManagerRobert Rodriguez And Steven Romick
Latest Disclosed Ownership221,896 shares
Latest Disclosed Value $ 109,068,541
First Pacific Advisors, LP reports 1.52% increase in ownership of TMO / Thermo Fisher Scientific Inc.

On May 14, 2026 - First Pacific Advisors, LP filed a 13F-HR form disclosing ownership of 221,896 shares of Thermo Fisher Scientific Inc. (MX:TMO) valued at $109,068,541 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 218,572 shares of Thermo Fisher Scientific Inc.. This represents a change in shares of 1.52% 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)
2026-05-14 2026-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 221,896 3,324 1.52 109,069 -13.88 1.5277
2026-02-17 2025-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 218,572 3,626 1.69 126,652 21.48 1.6673
2025-11-13 2025-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 214,946 127,576 146.02 104,253 194.29 1.4410
2025-08-01 2025-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 87,370 87,370 35,425 0.5069
2023-11-13 2023-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 0 -650 -100.00 0 -100.00
2023-08-11 2023-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 650 0 0.00 339 -9.36 0.0050
2023-05-09 2023-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 650 0 0.00 375 4.76 0.0058
2023-02-07 2022-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 650 0 0.00 358 8.18 0.0055
2022-11-04 2022-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 650 0 0.00 330 -6.52 0.0052
2022-08-08 2022-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 650 -1,140 -63.69 353 -66.60 0.0052
2022-05-11 2022-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,790 -179 -9.09 1,057 -19.56 0.0136
2022-02-08 2021-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,969 -310 -13.60 1,314 0.92 0.0163
2021-11-03 2021-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 2,279 0 0.00 1,302 13.22 0.0169
2021-08-10 2021-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 2,279 0 0.00 1,150 10.58 0.0144
2021-05-11 2021-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 2,279 0 0.00 1,040 -2.07 0.0141
2021-02-09 2020-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 2,279 -71 -3.02 1,062 2.31 0.0137
2020-11-13 2020-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 2,350 0 0.00 1,038 21.97 0.0144
2020-08-11 2020-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 2,350 0 0.00 851 27.78 0.0115
2020-05-08 2020-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 2,350 0 0.00 666 -12.71 0.0094
2020-02-13 2019-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 2,350 0 0.00 763 11.55 0.0073
2019-11-13 2019-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 2,350 0 0.00 684 -0.87 0.0064
2019-08-14 2019-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 2,350 0 0.00 690 7.31 0.0060
2019-05-28 2019-03-31 13F/A-1 THERMO FISHER SCIENTIFIC COM 883556102 2,350 0 0.00 643 22.24 0.0056
2019-05-14 2019-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 2,350 0 643
2019-02-12 2018-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 2,350 -193,312 -98.80 526 -98.90 0.0050
2018-11-13 2018-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 195,662 -1,053,044 -84.33 47,757 -81.54 0.3457
2018-08-13 2018-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 1,248,706 -80,403 -6.05 258,657 -5.74 1.8581
2018-05-12 2018-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,329,109 -8,961 -0.67 274,408 8.00 2.0906
2018-02-10 2017-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,338,070 8,190 0.62 254,073 0.98 1.9005
2017-11-14 2017-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 1,329,880 -132,640 -9.07 251,613 -1.39 1.9330
2017-08-14 2017-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 1,462,520 21,450 1.49 255,166 15.28 1.9341
2017-05-12 2017-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,441,070 -19,030 -1.30 221,348 7.44 1.7764
2017-02-14 2016-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,460,100 -216,050 -12.89 206,020 -22.73 1.6411
2016-11-14 2016-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 1,676,150 -112,680 -6.30 266,608 0.87 2.2118
2016-08-09 2016-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 1,788,830 99,770 5.91 264,318 10.52 2.2284
2016-05-16 2016-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,689,060 -143,350 -7.82 239,154 -7.99 2.1690
2016-02-16 2015-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,832,410 -101,140 -5.23 259,927 9.94 2.3054
2015-11-16 2015-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 1,933,550 -1,514,850 -43.93 236,434 -47.16 2.0376
2015-08-14 2015-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 3,448,400 37,600 1.10 447,464 -2.34 3.6475
2015-05-15 2015-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 3,410,800 -206,600 -5.71 458,207 1.10 3.8067
2015-02-17 2014-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 3,617,400 67,700 1.91 453,224 4.91 3.6140
2014-11-14 2014-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 3,549,700 28,500 0.81 431,998 3.97 3.5916
2014-08-14 2014-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 3,521,200 12,100 0.34 415,502 -1.52 3.3737
2014-05-14 2014-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 3,509,100 -402,800 -10.30 421,935 -3.13 3.6881
2014-02-12 2013-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 3,911,900 5,800 0.15 435,590 21.02 4.1020
2013-11-14 2013-09-30 13F THERMO FISHER SCIENTIFIC CS 883556102 3,906,100 5,800 0.15 359,947 9.05 3.7162
2013-08-14 2013-06-30 13F THERMO FISHER SCIENTIFIC CS 883556102 3,900,300 3,900,300 330,083 3.5156
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.