Thermo Fisher Scientific Inc.
MX ˙ BMV ˙ US8835561023
SecurityMX:TMO / Thermo Fisher Scientific Inc.
InstitutionKorea Investment CORP
Latest Disclosed Ownership266,151 shares
Latest Disclosed Value $ 130,821,201
Korea Investment CORP reports 1.82% increase in ownership of TMO / Thermo Fisher Scientific Inc.

On May 13, 2026 - Korea Investment CORP filed a 13F-HR form disclosing ownership of 266,151 shares of Thermo Fisher Scientific Inc. (MX:TMO) valued at $130,821,201 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 261,399 shares of Thermo Fisher Scientific Inc.. This represents a change in shares of 1.82% 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)
2026-05-13 2026-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 266,151 4,752 1.82 130,821 -13.63 0.2710
2026-02-13 2025-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 261,399 4,677 1.82 151,468 21.65 0.2982
2025-11-13 2025-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 256,722 -2,259 -0.87 124,515 18.58 0.2561
2025-08-13 2025-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 258,981 -96,717 -27.19 105,006 -40.67 0.2336
2025-05-14 2025-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 355,698 26,965 8.20 176,995 3.50 0.4290
2025-02-12 2024-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 328,733 -31,544 -8.76 171,017 -23.26 0.4055
2024-11-13 2024-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 360,277 11,493 3.30 222,857 15.54 0.5289
2024-08-13 2024-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 348,784 13,939 4.16 192,878 -0.89 0.4860
2024-05-14 2024-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 334,845 -30,572 -8.37 194,615 0.34 0.4938
2024-02-13 2023-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 365,417 -57,061 -13.51 193,960 -9.30 0.5093
2023-11-13 2023-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 422,478 24,506 6.16 213,846 2.99 0.6299
2023-08-11 2023-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 397,972 -79,251 -16.61 207,642 -24.51 0.5834
2023-05-12 2023-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 477,223 19,615 4.29 275,057 9.15 0.8009
2023-02-13 2022-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 457,608 -80,717 -14.99 252,000 -7.70 0.7917
2022-11-10 2022-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 538,325 36,408 7.25 273,033 0.13 0.8405
2022-08-12 2022-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 501,917 -21,461 -4.10 272,681 -11.79 0.8335
2022-05-13 2022-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 523,378 40,988 8.50 309,133 -3.96 0.7646
2022-02-09 2021-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 482,390 17,658 3.80 321,870 21.22 0.8366
2021-11-12 2021-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 464,732 -45,819 -8.97 265,515 3.09 0.7916
2021-08-12 2021-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 510,551 -91,768 -15.24 257,558 -6.30 0.7377
2021-05-13 2021-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 602,319 -78,278 -11.50 274,886 -13.29 0.8677
2021-02-10 2020-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 680,597 -41,959 -5.81 317,008 -0.63 0.9524
2020-11-12 2020-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 722,556 -193,069 -21.09 319,023 -3.84 1.1272
2020-08-12 2020-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 915,625 19,066 2.13 331,768 30.48 1.2188
2020-05-14 2020-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 896,559 -27,883 -3.02 254,264 -15.34 1.1161
2020-02-11 2019-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 924,442 487,300 111.47 300,323 135.87 1.0949
2019-11-12 2019-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 437,142 2,200 0.51 127,326 -0.32 0.5382
2019-08-12 2019-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 434,942 -4,300 -0.98 127,734 6.24 0.5492
2019-05-15 2019-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 439,242 23,566 5.67 120,229 29.25 0.5411
2019-02-13 2018-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 415,676 -6,700 -1.59 93,024 -9.77 0.5056
2018-11-13 2018-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 422,376 -35,032 -7.66 103,094 8.81 0.4754
2018-08-13 2018-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 457,408 5,800 1.28 94,747 1.62 0.4317
2018-05-09 2018-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 451,608 -10,983 -2.37 93,239 6.15 0.4339
2018-02-12 2017-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 462,591 22,152 5.03 87,837 5.41 0.3998
2017-10-25 2017-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 440,439 -43,200 -8.93 83,331 -1.24 0.3850
2017-07-31 2017-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 483,639 30,744 6.79 84,380 21.30 0.3932
2017-04-25 2017-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 452,895 -90,853 -16.71 69,565 -9.33 0.3451
2017-02-13 2016-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 543,748 107,165 24.55 76,723 10.48 0.3687
2016-11-09 2016-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 436,583 22,858 5.52 69,443 13.60 0.3701
2016-08-12 2016-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 413,725 91,200 28.28 61,132 33.87 0.3640
2016-05-12 2016-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 322,525 -24,900 -7.17 45,666 -7.34 0.3339
2016-02-01 2015-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 347,425 3,800 1.11 49,282 17.29 0.3433
2015-11-12 2015-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 343,625 85,725 33.24 42,018 25.56 0.3346
2015-08-13 2015-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 257,900 -25,100 -8.87 33,465 -11.98 0.2852
2015-05-11 2015-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 283,000 86,100 43.73 38,018 54.11 0.2962
2015-02-12 2014-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 196,900 2,400 1.23 24,670 4.22 0.2025
2014-11-14 2014-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 194,500 -79,300 -28.96 23,671 -26.73 0.1931
2014-08-14 2014-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 273,800 2,100 0.77 32,308 -1.11 0.2689
2014-05-14 2014-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 271,700 175,700 183.02 32,669 205.60 0.2893
2014-02-06 2013-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 96,000 3,300 3.56 10,690 25.15 0.1011
2013-11-07 2013-09-30 13F/A-1 THERMO FISHER SCIENTIFIC COM 883556102 92,700 3,300 3.69 8,542 12.90 0.0908
2013-11-05 2013-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 60,700 5,594
2013-08-08 2013-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 89,400 89,400 7,566 0.0907
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.