Thermo Fisher Scientific Inc.
MX ˙ BMV ˙ US8835561023
SecurityMX:TMO / Thermo Fisher Scientific Inc.
InstitutionKentucky Retirement Systems
Latest Disclosed Ownership29,835 shares
Latest Disclosed Value $ 3,322
Kentucky Retirement Systems reports 25.83% increase in ownership of TMO / Thermo Fisher Scientific Inc.

On May 19, 2026 - Kentucky Retirement Systems filed a 13F-HR form disclosing ownership of 29,835 shares of Thermo Fisher Scientific Inc. (MX:TMO) valued at $3,322 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 10, 2026 disclosing 23,710 shares of Thermo Fisher Scientific Inc.. This represents a change in shares of 25.83% 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)
2026-05-19 2026-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 29,835 6,125 25.83 3 -99.98 0.2433
2026-02-10 2025-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 23,710 0 0.00 13,739 19.47 0.3722
2025-11-13 2025-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 23,710 -769 -3.14 11,500 15.86 0.3181
2025-08-20 2025-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 24,479 -1,604 -6.15 9,925 -23.52 0.2904
2025-04-22 2025-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 26,083 -167 -0.64 12,979 -4.96 0.3957
2025-02-03 2024-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 26,250 -362 -1.36 13,656 -17.04 0.4026
2024-11-06 2024-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 26,612 -2,153 -7.48 16,461 3.48 0.4852
2024-08-12 2024-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 28,765 -577 -1.97 15,907 -6.72 0.4608
2024-05-15 2024-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 29,342 -1,572 -5.09 17,054 3.93 0.5095
2024-02-08 2023-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 30,914 -1,568 -4.83 16,409 -0.20 0.5122
2023-10-12 2023-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 32,482 1,469 4.74 16,441 102,656.25 0.5714
2023-08-07 2023-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 31,013 3 0.01 16 -5.88 0.5416
2023-05-10 2023-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 31,010 207 0.67 18 6.25 0.6583
2023-02-06 2022-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 30,803 135 0.44 17 -99.90 0.6690
2022-11-16 2022-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 30,668 1,614 5.56 15,555 -1.45 0.6598
2022-08-08 2022-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 29,054 3,937 15.67 15,784 6.40 0.6666
2022-05-09 2022-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 25,117 1,983 8.57 14,835 -3.89 0.6079
2022-02-04 2021-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 23,134 259 1.13 15,436 18.11 0.6273
2021-11-17 2021-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 22,875 -12 -0.05 13,069 13.19 0.6148
2021-08-12 2021-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 22,887 -972 -4.07 11,546 6.03 0.5459
2021-05-14 2021-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 23,859 -1,192 -4.76 10,889 -6.68 0.5323
2021-02-11 2020-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 25,051 1,945 8.42 11,668 14.37 0.6021
2020-11-12 2020-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 23,106 1,119 5.09 10,202 28.05 0.6295
2020-08-12 2020-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 21,987 -5,399 -19.71 7,967 2.57 0.5590
2020-05-01 2020-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 27,386 6,757 32.75 7,767 15.89 0.5309
2020-02-18 2019-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 20,629 108 0.53 6,702 12.13 0.4879
2019-11-05 2019-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 20,521 1,894 10.17 5,977 9.27 0.4747
2019-08-07 2019-06-30 13F/A-1 THERMO FISHER SCIENTIFIC COM 883556102 18,627 1,026 5.83 5,470 13.53 0.4823
2019-08-07 2019-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 18,627 1,026 5,470
2019-05-22 2019-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 17,601 90 0.51 4,818 22.94 0.4663
2019-02-25 2018-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 17,511 358 2.09 3,919 -6.40 0.4294
2018-11-19 2018-09-30 13F/A-1 THERMO FISHER SCIENTIFIC COM 883556102 17,153 71 0.42 4,187 18.34 0.4002
2018-11-16 2018-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 29,835 12,753 3,322
2018-08-13 2018-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 17,082 -3,886 -18.53 3,538 -18.27 0.3621
2018-05-07 2018-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 20,968 -3,760 -15.21 4,329 -7.80 0.3689
2018-02-13 2017-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 24,728 707 2.94 4,695 3.30 0.3343
2017-11-08 2017-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 24,021 -1,058 -4.22 4,545 3.86 0.3432
2017-08-18 2017-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 25,079 50 0.20 4,376 13.84 0.3289
2017-05-24 2017-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 25,029 -3,636 -12.68 3,844 -4.97 0.2960
2017-02-24 2016-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 28,665 -1,468 -4.87 4,045 -15.61 0.2894
2016-11-30 2016-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 30,133 -3,330 -9.95 4,793 -3.05 0.3190
2016-09-12 2016-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 33,463 -2,942 -8.08 4,944 -4.09 0.3198
2016-06-09 2016-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 36,405 6,092 20.10 5,155 19.88 0.3129
2016-02-22 2015-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 30,313 2,970 10.86 4,300 28.59 0.3166
2015-11-18 2015-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 27,343 484 1.80 3,344 -4.05 0.2880
2015-08-26 2015-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 26,859 152 0.57 3,485 -2.87 0.2835
2015-05-29 2015-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 26,707 -3,030 -10.19 3,588 -3.70 0.2913
2015-03-04 2014-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 29,737 -1,299 -4.19 3,726 -1.35 0.2748
2014-12-12 2014-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 31,036 -1,440 -4.43 3,777 -3.28 0.2772
2014-05-22 2014-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 32,476 2,641 8.85 3,905 17.55 0.2821
2014-02-13 2013-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 29,835 -110 -0.37 3,322 20.41 0.2433
2013-11-15 2013-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 29,945 29,945 2,759 0.2222
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.