Thermo Fisher Scientific Inc.
MX ˙ BMV ˙ US8835561023
SecurityMX:TMO / Thermo Fisher Scientific Inc.
InstitutionClearbridge Investments, LLC
Latest Disclosed Ownership1,610,697 shares
Latest Disclosed Value $ 791,705,711
Clearbridge Investments, LLC reports 13.53% decrease in ownership of TMO / Thermo Fisher Scientific Inc.

On May 13, 2026 - Clearbridge Investments, LLC filed a 13F-HR form disclosing ownership of 1,610,697 shares of Thermo Fisher Scientific Inc. (MX:TMO) valued at $791,705,711 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 11, 2026 disclosing 1,862,726 shares of Thermo Fisher Scientific Inc.. This represents a change in shares of -13.53% 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 1,610,697 -252,029 -13.53 791,706 -26.65 0.6203
2026-02-11 2025-12-31 13F Thermo Fisher Scientific COM 883556102 1,862,726 -104,802 -5.33 1,079,356 13.11 0.8642
2025-11-13 2025-09-30 13F Thermo Fisher Scientific COM 883556102 1,967,528 546,587 38.47 954,290 65.64 0.7186
2025-08-12 2025-06-30 13F Thermo Fisher Scientific COM 883556102 1,420,941 -241,924 -14.55 576,135 -30.37 0.4678
2025-05-13 2025-03-31 13F Thermo Fisher Scientific COM 883556102 1,662,865 -188,324 -10.17 827,441 -14.08 0.7229
2025-02-12 2024-12-31 13F Thermo Fisher Scientific COM 883556102 1,851,189 -242,394 -11.58 963,044 -25.64 0.7805
2024-11-12 2024-09-30 13F Thermo Fisher Scientific COM 883556102 2,093,583 -4,499 -0.21 1,295,028 11.62 1.0184
2024-08-27 2024-06-30 13F/A-1 Thermo Fisher Scientific COM 883556102 2,098,082 -138,694 -6.20 1,160,239 -10.75 0.9424
2024-08-14 2024-06-30 13F Thermo Fisher Scientific COM 883556102 2,098,082 -138,694 1,160,239 0.9488
2024-05-13 2024-03-31 13F Thermo Fisher Scientific COM 883556102 2,236,776 8,046 0.36 1,300,036 9.89 1.0306
2024-02-09 2023-12-31 13F Thermo Fisher Scientific COM 883556102 2,228,730 553,695 33.06 1,182,987 39.53 1.0178
2023-11-13 2023-09-30 13F Thermo Fisher Scientific COM 883556102 1,675,035 51,113 3.15 847,852 0.07 0.8156
2023-08-11 2023-06-30 13F Thermo Fisher Scientific COM 883556102 1,623,922 -156,773 -8.80 847,281 -17.45 0.7646
2023-05-12 2023-03-31 13F Thermo Fisher Scientific COM 883556102 1,780,695 -293,587 -14.15 1,026,339 -10.15 0.9807
2023-02-10 2022-12-31 13F Thermo Fisher Scientific COM 883556102 2,074,282 -564,175 -21.38 1,142,286 -14.64 1.1282
2022-11-14 2022-09-30 13F Thermo Fisher Scientific COM 883556102 2,638,457 -108,005 -3.93 1,338,199 -10.31 1.3494
2022-08-11 2022-06-30 13F Thermo Fisher Scientific COM 883556102 2,746,462 -27,074 -0.98 1,492,098 -8.92 1.3907
2022-05-13 2022-03-31 13F Thermo Fisher Scientific COM 883556102 2,773,536 -29,979 -1.07 1,638,189 -12.43 1.2310
2022-02-11 2021-12-31 13F Thermo Fisher Scientific COM 883556102 2,803,515 -86,816 -3.00 1,870,618 13.28 1.2741
2021-11-12 2021-09-30 13F Thermo Fisher Scientific COM 883556102 2,890,331 -66,214 -2.24 1,651,333 10.72 1.1773
2021-08-13 2021-06-30 13F Thermo Fisher Scientific COM 883556102 2,956,545 24,684 0.84 1,491,488 11.47 1.0377
2021-05-13 2021-03-31 13F Thermo Fisher Scientific COM 883556102 2,931,861 -182,947 -5.87 1,338,043 -7.77 0.9978
2021-02-10 2020-12-31 13F Thermo Fisher Scientific COM 883556102 3,114,808 -140,353 -4.31 1,450,815 0.95 1.1206
2020-11-12 2020-09-30 13F Thermo Fisher Scientific COM 883556102 3,255,161 -200,815 -5.81 1,437,219 14.77 1.2355
2020-08-14 2020-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 3,455,976 49,214 1.44 1,252,239 29.61 1.1306
2020-05-22 2020-03-31 13F/A-1 THERMO FISHER SCIENTIFIC COM 883556102 3,406,762 -2,526 -0.07 966,158 -13.17 1.0473
2020-05-15 2020-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 3,406,762 -2,526 966,158 1,047,342.3778
2020-02-14 2019-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 3,409,288 13,078 0.39 1,112,689 12.48 0.9217
2019-11-14 2019-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 3,396,210 268,846 8.60 989,214 7.71 0.8634
2019-08-14 2019-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 3,127,364 38,169 1.24 918,444 8.62 0.7960
2019-05-15 2019-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 3,089,195 71,898 2.38 845,574 25.23 0.7471
2019-02-14 2018-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 3,017,297 39,966 1.34 675,241 -7.08 0.6830
2018-11-28 2018-09-30 13F/A-1 THERMO FISHER SCIENTIFIC COM 883556102 2,977,331 -12,419 -0.42 726,707 17.34 0.6255
2018-11-14 2018-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 2,977,331 -12,419 726,707
2018-08-14 2018-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 2,989,750 57,623 1.97 619,297 2.30 0.5070
2018-05-15 2018-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 2,932,127 69,728 2.44 605,367 11.38 0.5713
2018-02-14 2017-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 2,862,399 143,518 5.28 543,512 5.66 0.5022
2017-11-14 2017-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 2,718,881 75,735 2.87 514,412 11.55 0.4947
2017-08-14 2017-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 2,643,146 71,363 2.77 461,150 16.74 0.4532
2017-06-07 2017-03-31 13F/A-1 THERMO FISHER SCIENTIFIC COM 883556102 2,571,783 365,409 16.56 395,026 26.89 0.3974
2017-05-15 2017-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 2,571,783 395,026
2017-02-14 2016-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 2,206,374 233,092 11.81 311,319 -0.81 0.3422
2016-11-14 2016-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 1,973,282 103,761 5.55 313,870 13.62 0.3534
2016-08-15 2016-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 1,869,521 99,588 5.63 276,240 10.23 0.3264
2016-05-16 2016-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,769,933 58,316 3.41 250,605 3.22 0.2994
2016-02-16 2015-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,711,617 92,303 5.70 242,793 22.62 0.2812
2015-11-16 2015-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 1,619,314 -2,420 -0.15 198,010 -5.90 0.2370
2015-08-17 2015-06-30 13F/A-1 THERMO FISHER SCIENTIFIC COM 883556102 1,621,734 -27,761 -1.68 210,436 -5.03 0.2225
2015-08-14 2015-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 1,621,734 210,436
2015-05-15 2015-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,649,495 19,713 1.21 221,593 8.52 0.2301
2015-02-17 2014-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,629,782 -2,244 -0.14 204,195 2.81 0.2148
2014-11-14 2014-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 1,632,026 -7,048 -0.43 198,618 2.69 0.2187
2014-08-14 2014-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 1,639,074 -22,607 -1.36 193,411 -3.20 0.2175
2014-05-15 2014-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,661,681 -201,430 -10.81 199,801 -3.69 0.2371
2014-02-14 2013-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,863,111 12,739 0.69 207,457 21.67 0.2586
2013-11-14 2013-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 1,850,372 -229,492 -11.03 170,512 -3.13 0.2381
2013-08-14 2013-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 2,079,864 2,079,864 176,019 0.2687
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.