Thermo Fisher Scientific Inc.
CL ˙ SNSE ˙ US8835561023
SecurityCL:TMOCL / Thermo Fisher Scientific Inc.
InstitutionTcw Group Inc
Latest Disclosed Ownership6,213 shares
Latest Disclosed Value $ 3,053,876
Tcw Group Inc reports 4.60% increase in ownership of TMOCL / Thermo Fisher Scientific Inc.

On May 14, 2026 - Tcw Group Inc filed a 13F-HR form disclosing ownership of 6,213 shares of Thermo Fisher Scientific Inc. (CL:TMOCL) valued at $3,053,876 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 5,940 shares of Thermo Fisher Scientific Inc.. This represents a change in shares of 4.60% 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 6,213 273 4.60 3,054 -11.28 0.0230
2026-02-17 2025-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 5,940 5,940 3,442 0.0247
2021-07-23 2021-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 0 -31,593 -100.00 0 -100.00
2021-05-05 2021-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 31,593 -10,501 -24.95 14,418 -26.46 0.1381
2021-02-02 2020-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 42,094 -12,827 -23.36 19,606 -19.14 0.1707
2020-10-30 2020-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 54,921 -234 -0.42 24,248 21.34 0.2644
2020-08-05 2020-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 55,155 -125 -0.23 19,984 27.47 0.2331
2020-05-05 2020-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 55,280 13,147 31.20 15,678 14.54 0.2168
2020-02-10 2019-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 42,133 1,401 3.44 13,688 15.37 0.1516
2019-11-13 2019-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 40,732 7,172 21.37 11,864 20.37 0.1352
2019-08-07 2019-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 33,560 -2,088 -5.86 9,856 1.00 0.1048
2019-05-13 2019-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 35,648 7,112 24.92 9,758 52.80 0.0935
2019-02-11 2018-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 28,536 28,536 6,386 0.0661
2017-05-11 2017-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 0 -29,175 -100.00 0 -100.00
2017-02-10 2016-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 29,175 0 0.00 4,117 -11.29 0.0310
2016-11-14 2016-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 29,175 -2,504 -7.90 4,641 -0.85 0.0353
2016-08-12 2016-06-30 13F/A-1 THERMO FISHER SCIENTIFIC COM 883556102 31,679 850 2.76 4,681 7.24 0.0354
2016-08-11 2016-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 31,679 4,681
2016-05-16 2016-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 30,829 -12,441 -28.75 4,365 -28.87 0.0320
2016-02-16 2015-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 43,270 1,150 2.73 6,137 19.17 0.0441
2015-11-13 2015-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 42,120 -376 -0.88 5,150 -6.60 0.0370
2015-08-12 2015-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 42,496 -83,979 -66.40 5,514 -67.55 0.0355
2015-05-13 2015-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 126,475 123 0.10 16,991 7.33 0.0816
2015-02-13 2014-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 126,352 -83,238 -39.71 15,831 -37.93 0.0662
2014-11-14 2014-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 209,590 -4,744 -2.21 25,507 0.85 0.1026
2014-08-14 2014-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 214,334 4,566 2.18 25,292 0.27 0.1042
2014-05-13 2014-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 209,768 -457,813 -68.58 25,223 -66.07 0.1047
2014-02-18 2013-12-31 13F/A-1 THERMO FISHER SCIENTIFIC COM 883556102 667,581 -287,409 -30.10 74,335 -15.53 0.3133
2014-02-14 2013-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 74,335 667,581
2013-11-14 2013-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 954,990 -106,515 -10.03 88,003 -2.04 0.4065
2013-08-14 2013-06-30 13F/A-1 THERMO FISHER SCIENTIFIC COM 883556102 1,061,505 1,061,505 89,835 0.4430
2013-08-14 2013-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 1,061,505 89,835
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.