Thermo Fisher Scientific Inc.
MX ˙ BMV ˙ US8835561023
SecurityMX:TMO / Thermo Fisher Scientific Inc.
InstitutionGuggenheim Capital Llc
Latest Disclosed Ownership37,348 shares
Latest Disclosed Value $ 18,357,663
Guggenheim Capital Llc reports 7.39% decrease in ownership of TMO / Thermo Fisher Scientific Inc.

On May 15, 2026 - Guggenheim Capital Llc filed a 13F-HR form disclosing ownership of 37,348 shares of Thermo Fisher Scientific Inc. (MX:TMO) valued at $18,357,663 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 40,329 shares of Thermo Fisher Scientific Inc.. This represents a change in shares of -7.39% 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)
2026-05-15 2026-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 37,348 -2,981 -7.39 18,358 -21.44 0.0709
2026-02-17 2025-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 40,329 -2,655 -6.18 23,369 12.09 0.1673
2025-11-13 2025-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 42,984 -270 -0.62 20,848 18.88 0.1513
2025-08-13 2025-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 43,254 792 1.87 17,538 -17.00 0.1392
2025-05-14 2025-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 42,462 1,841 4.53 21,129 -0.01 0.1941
2025-02-13 2024-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 40,621 2,328 6.08 21,132 -10.78 0.1713
2024-11-13 2024-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 38,293 1,136 3.06 23,687 15.28 0.1658
2024-08-14 2024-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 37,157 -298 -0.80 20,548 -5.61 0.1457
2024-05-14 2024-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 37,455 144 0.39 21,769 9.92 0.1534
2024-02-14 2023-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 37,311 2,242 6.39 19,804 11.57 0.1496
2023-11-14 2023-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 35,069 -2,053 -5.53 17,751 -8.35 0.1526
2023-08-11 2023-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 37,122 3,847 11.56 19,368 0.99 0.1520
2023-05-11 2023-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 33,275 6,227 23.02 19,179 28.75 0.1614
2023-02-14 2022-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 27,048 4,285 18.82 14,895 29.02 0.1308
2022-11-14 2022-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 22,763 -2,979 -11.57 11,545 -17.45 0.1057
2022-08-15 2022-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 25,742 -5,406 -17.36 13,985 -23.99 0.1104
2022-05-16 2022-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 31,148 -23,858 -43.37 18,398 -49.87 0.1107
2022-02-14 2021-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 55,006 10,477 23.53 36,703 44.27 0.1914
2021-11-15 2021-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 44,529 -6,228 -12.27 25,441 -0.64 0.1528
2021-08-13 2021-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 50,757 -3,298 -6.10 25,606 3.79 0.1507
2021-05-13 2021-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 54,055 -5,697 -9.53 24,670 -11.36 0.1620
2021-02-16 2020-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 59,752 2,714 4.76 27,831 10.51 0.1745
2020-11-13 2020-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 57,038 -1,295 -2.22 25,184 19.15 0.1823
2020-08-14 2020-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 58,333 -4,764 -7.55 21,137 18.12 0.1635
2020-06-02 2020-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 63,097 -2,274 -3.48 17,895 -15.74 0.1802
2020-02-20 2019-12-31 13F/A-1 THERMO FISHER SCIENTIFIC COM 883556102 65,371 -11,341 -14.78 21,238 -4.95 0.1595
2020-02-14 2019-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 65,371 -11,341 21,238 125,873.3807
2020-02-20 2019-09-30 13F/A-1 THERMO FISHER SCIENTIFIC COM 883556102 76,712 -13,601 -15.06 22,345 -15.75 0.1786
2019-11-14 2019-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 76,712 -13,601 22,345 163,750.7143
2019-08-14 2019-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 90,313 -7,972 -8.11 26,522 -1.42 0.2158
2019-05-15 2019-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 98,285 -10,357 -9.53 26,903 10.65 0.2192
2019-02-14 2018-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 108,642 -484 -0.44 24,313 -8.72 0.2060
2018-11-14 2018-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 109,126 1,340 1.24 26,636 19.30 0.1736
2018-08-14 2018-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 107,786 -164,593 -60.43 22,326 -60.30 0.1490
2018-05-15 2018-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 272,379 -43,082 -13.66 56,235 -6.12 0.1372
2018-02-14 2017-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 315,461 17,552 5.89 59,899 6.27 0.1419
2017-11-14 2017-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 297,909 -34,422 -10.36 56,365 -2.79 0.1324
2017-08-14 2017-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 332,331 9,065 2.80 57,981 16.77 0.1536
2017-05-15 2017-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 323,266 -19,154 -5.59 49,654 2.77 0.1346
2017-02-14 2016-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 342,420 34,765 11.30 48,315 -1.27 0.1382
2016-11-14 2016-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 307,655 35,107 12.88 48,935 21.51 0.1522
2016-08-15 2016-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 272,548 -17,000 -5.87 40,272 -1.77 0.1265
2016-05-16 2016-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 289,548 -39,754 -12.07 40,996 -12.23 0.1293
2016-02-16 2015-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 329,302 -154,763 -31.97 46,711 -21.09 0.1359
2015-11-16 2015-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 484,065 -81,902 -14.47 59,192 -19.40 0.1821
2015-08-14 2015-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 565,967 64,363 12.83 73,439 8.98 0.1813
2015-05-18 2015-03-31 13F/A-1 THERMO FISHER SCIENTIFIC COM 883556102 501,604 83,156 19.87 67,387 28.53 0.1595
2015-05-15 2015-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 501,604 67,387
2015-02-17 2014-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 418,448 54,624 15.01 52,428 18.41 0.1315
2014-11-14 2014-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 363,824 40,616 12.57 44,277 16.09 0.1068
2014-08-14 2014-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 323,208 33,871 11.71 38,139 9.62 0.0965
2014-05-16 2014-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 289,337 14,358 5.22 34,791 13.63 0.0990
2014-02-14 2013-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 274,979 74,108 36.89 30,619 65.42 0.0930
2013-11-14 2013-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 200,871 -7,782 -3.73 18,510 4.83 0.0665
2013-08-22 2013-06-30 13F/A-1 THERMO FISHER SCIENTIFIC COM 883556102 208,653 208,653 17,657 0.0743
2013-08-14 2013-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 208,653 17,657 0.0744
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.