Thermo Fisher Scientific Inc.
MX ˙ BMV ˙ US8835561023
SecurityMX:TMO / Thermo Fisher Scientific Inc.
InstitutionNorthwestern Mutual Wealth Management Co
Latest Disclosed Ownership122,728 shares
Latest Disclosed Value $ 60,324,840
Northwestern Mutual Wealth Management Co reports 2.41% increase in ownership of TMO / Thermo Fisher Scientific Inc.

On May 7, 2026 - Northwestern Mutual Wealth Management Co filed a 13F-HR form disclosing ownership of 122,728 shares of Thermo Fisher Scientific Inc. (MX:TMO) valued at $60,324,840 USD as of March 31, 2026. The entity filed a previous 13F-HR/A on February 10, 2026 disclosing 119,839 shares of Thermo Fisher Scientific Inc.. This represents a change in shares of 2.41% 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.

Upgrade to unlock premium data and export to Excel .

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)
2026-05-07 2026-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 122,728 2,889 2.41 60,325 -13.13 0.0371
2026-02-10 2025-12-31 13F/A-1 THERMO FISHER SCIENTIFIC COM 883556102 119,839 908 0.76 69,442 20.38 0.0439
2026-02-05 2025-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 446,582 327,651 11,565 0.0073
2025-11-14 2025-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 118,931 4,995 4.38 57,684 24.87 0.0385
2025-08-13 2025-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 113,936 -2,374 -2.04 46,197 -20.18 0.0337
2025-05-14 2025-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 116,310 2,609 2.29 57,876 -2.16 0.0473
2025-02-11 2024-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 113,701 -1,098 -0.96 59,151 -16.70 0.0499
2024-11-12 2024-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 114,799 3,093 2.77 71,012 14.95 0.0631
2024-08-16 2024-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 111,706 4,030 3.74 61,776 -1.29 0.0609
2024-05-15 2024-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 107,676 -3,130 -2.82 62,584 6.41 0.0643
2024-02-13 2023-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 110,806 1,250 1.14 58,817 6.06 0.0663
2023-11-14 2023-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 109,556 2,921 2.74 55,456 -0.33 0.0721
2023-08-14 2023-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 106,635 3,179 3.07 55,637 -6.69 0.0719
2023-05-15 2023-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 103,456 -6,347 -5.78 59,629 -1.39 0.0832
2023-02-21 2022-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 109,803 2,897 2.71 60,470 11.52 0.0915
2022-11-14 2022-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 106,906 7,240 7.26 54,222 0.14 0.0946
2022-08-04 2022-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 99,666 4,745 5.00 54,147 -3.42 0.0930
2022-05-09 2022-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 94,921 8,256 9.53 56,064 -3.05 0.0899
2022-02-03 2021-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 86,665 6,222 7.73 57,827 25.83 0.0944
2021-11-15 2021-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 80,443 4,401 5.79 45,958 19.81 0.0840
2021-08-13 2021-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 76,042 3,203 4.40 38,360 15.39 0.0729
2021-05-14 2021-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 72,839 4,664 6.84 33,243 4.69 0.0706
2021-02-12 2020-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 68,175 -10,754 -13.62 31,755 -8.88 0.0734
2020-11-13 2020-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 78,929 1,316 1.70 34,849 23.92 0.0938
2020-08-14 2020-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 77,613 8,193 11.80 28,122 42.85 0.0868
2020-05-08 2020-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 69,420 5,688 8.92 19,687 -4.92 0.0760
2020-02-13 2019-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 63,732 40 0.06 20,706 11.62 0.0706
2019-11-12 2019-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 63,692 -9,865 -13.41 18,551 -14.13 0.0705
2019-08-12 2019-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 73,557 1,203 1.66 21,603 9.07 0.0868
2019-05-10 2019-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 72,354 3,711 5.41 19,806 28.94 0.0867
2019-02-12 2018-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 68,643 11,747 20.65 15,361 10.62 0.0769
2018-11-01 2018-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 56,896 3,032 5.63 13,886 24.46 0.0701
2018-08-10 2018-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 53,864 44,334 465.20 11,157 466.92 0.0625
2018-05-14 2018-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 9,530 106 1.12 1,968 10.01 0.0119
2018-01-31 2017-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 9,424 244 2.66 1,789 2.99 0.0114
2017-11-07 2017-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 9,180 778 9.26 1,737 18.49 0.0124
2017-08-10 2017-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 8,402 2,243 36.42 1,466 54.80 0.0118
2017-05-09 2017-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 6,159 -1,211 -16.43 947 -9.03 0.0086
2017-02-15 2016-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 7,370 -1,556 -17.43 1,041 -26.69 0.0113
2017-02-23 2016-09-30 13F/A-2 THERMO FISHER SCIENTIFIC COM 883556102 8,926 -7,995 -47.25 1,420 -43.18 0.0937
2016-11-14 2016-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 6,366 1,013
2016-08-29 2016-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 16,921 10,533 164.89 2,499 176.44 0.0358
2016-05-16 2016-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 6,388 -887 -12.19 904 -12.49 0.0146
2016-02-16 2015-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 7,275 1,096 17.74 1,033 36.82 0.0206
2015-11-16 2015-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 6,179 -24 -0.39 755 -6.21 0.0180
2015-09-30 2015-06-30 13F/A-1 THERMO FISHER SCIENTIFIC COM 883556102 6,203 2,605 72.40 805 66.67 0.0209
2015-08-14 2015-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 3,598 482
2015-05-15 2015-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 3,598 388 12.09 483 20.45 0.0135
2015-02-13 2014-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 3,210 -62 -1.89 401 0.75 0.0124
2014-11-14 2014-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 3,272 128 4.07 398 7.86 0.0139
2014-08-05 2014-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 3,144 1,319 72.27 369 69.27 0.0144
2014-05-15 2014-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,825 -5,017 -73.33 218 -71.39 0.0091
2014-02-14 2013-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 6,842 -1,256 -15.51 762 2.14 0.0346
2013-11-14 2013-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 8,098 -3,017 -27.14 746 -20.72 0.0392
2013-08-21 2013-06-30 13F/A-1 THERMO FISHER SCIENTIFIC COM 883556102 11,115 11,115 941 0.0563
2013-08-14 2013-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 75,640 6,401 0.0704
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.