Thermo Fisher Scientific Inc.
MX ˙ BMV ˙ US8835561023
SecurityMX:TMO / Thermo Fisher Scientific Inc.
InstitutionShelton Capital Management
Latest Disclosed Ownership6,490 shares
Latest Disclosed Value $ 3,190,030
Shelton Capital Management ownership in TMO / Thermo Fisher Scientific Inc.

On May 15, 2026 - Shelton Capital Management filed a 13F-HR form disclosing ownership of 6,490 shares of Thermo Fisher Scientific Inc. (MX:TMO) valued at $3,190,030 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 9,045 shares of Thermo Fisher Scientific Inc.. This represents a change in shares of -28.25% during the quarter.

Shelton Capital Management has a history of taking positions in derivatives of the underlying security (TMO) in the form of stock options.

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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Institutional Put/Call Ratios
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In addition to reporting standard equity and debt issues, institutions with more than 100MM assets under management must also disclose their put and call option holdings. Since put options generally indicate negative sentiment, and call options indicate positive sentiment, we can get a sense of the overall institutional sentiment by plotting the ratio of puts to calls. The chart to the right plots the historical put/call ratio for this instrument.

Using Put/Call Ratio as an indicator of investor sentiment overcomes one of the key deficiencies of using total institutional ownership, which is that a significant amount of assets under management are invested passively to track indices. Passively-managed funds do not typically buy options, so the put/call ratio indicator more closely tracks the sentiment of actively-managed funds.

MX:TMO / Thermo Fisher Scientific Inc. Historical Put/Call Ratio
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 6,490 -2,555 -28.25 3,190 -39.13 0.0698
2026-02-17 2025-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 9,045 5,300 141.52 5,241 188.60 0.1035
2025-11-14 2025-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 3,745 -55 -1.45 1,816 17.92 0.0389
2025-08-13 2025-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 3,800 -40 -1.04 1,541 -19.37 0.0354
2025-05-15 2025-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 3,840 -18 -0.47 1,911 -4.83 0.0455
2025-02-13 2024-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 3,858 -40 -1.03 2,007 -16.76 0.0500
2024-11-14 2024-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 3,898 -88 -2.21 2,411 9.39 0.0619
2024-08-13 2024-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 3,986 0 0.00 2,204 -4.84 0.0598
2024-05-15 2024-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 3,986 1,700 74.37 2,317 90.93 0.0658
2024-02-14 2023-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 2,286 -130 -5.38 1,213 -0.74 0.0384
2023-11-14 2023-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 2,416 0 0.00 1,223 -3.02 0.0448
2023-08-10 2023-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 2,416 -4 -0.17 1,261 -9.61 0.0453
2023-05-11 2023-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 2,420 -51 -2.06 1,395 2.50 0.0581
2023-02-13 2022-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 2,471 0 0.00 1,361 8.54 0.1425
2022-11-14 2022-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 2,471 -25 -1.00 1,253 -7.60 0.0596
2022-08-11 2022-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 2,496 -407 -14.02 1,356 -20.93 0.0610
2022-05-12 2022-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 2,903 0 0.00 1,715 -11.46 0.0633
2022-02-11 2021-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 2,903 -32 -1.09 1,937 15.50 0.0685
2021-11-15 2021-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 2,935 373 14.56 1,677 29.80 0.0655
2021-08-12 2021-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 2,562 -2,562 -50.00 1,292 -44.74 0.0488
2021-05-14 2021-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 5,124 2,505 95.65 2,338 91.64 0.0814
2021-02-16 2020-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 2,619 -9,954 -79.17 1,220 -78.02 0.0548
2020-11-09 2020-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 12,573 9,815 355.87 5,551 455.66 0.2298
2020-08-12 2020-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 2,758 -70 -2.48 999 24.56 0.0550
2020-05-13 2020-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 2,828 0 0.00 802 -12.73 0.0581
2020-02-11 2019-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 2,828 -234 -7.64 919 3.03 0.0508
2019-11-13 2019-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 3,062 0 0.00 892 -0.78 0.0527
2019-08-14 2019-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 3,062 2,224 265.39 899 -70.64 0.0518
2019-05-10 2019-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 838 -2,224 -72.63 3,062 347.01 0.0121
2019-01-31 2018-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 3,062 0 0.00 685 -8.30 0.0466
2018-11-14 2018-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 3,062 0 0.00 747 17.82 0.0426
2018-08-10 2018-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 3,062 0 0.00 634 0.32 0.0394
2018-05-15 2018-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 3,062 0 0.00 632 8.78 0.0415
2018-02-06 2017-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 3,062 0 0.00 581 0.35 0.0373
2017-11-28 2017-09-30 13F/A-1 THERMO FISHER SCIENTIFIC COM 883556102 3,062 -12,200 -79.94 579 -85.86 0.0391
2017-08-14 2017-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 15,262 -200 -1.29 4,094 72.38 0.2893
2017-11-28 2017-03-31 13F/A-1 THERMO FISHER SCIENTIFIC COM 883556102 15,462 4,104 36.13 2,375 48.16 0.1645
2017-05-15 2017-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 23,662 12,304 3,634
2017-11-28 2016-12-31 13F/A-2 THERMO FISHER SCIENTIFIC COM 883556102 11,358 -300 -2.57 1,603 -13.54 0.1221
2017-02-16 2016-12-31 13F/A-1 THERMO FISHER SCIENTIFIC COM 883556102 11,358 0 1,603 0.1407
2017-02-13 2016-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 11,358 1,603
2017-12-06 2016-09-30 13F/A-2 THERMO FISHER SCIENTIFIC COM 883556102 11,658 -3,302 -22.07 1,854 -16.11 0.1547
2017-12-04 2016-09-30 13F/A-1 THERMO FISHER SCIENTIFIC COM 883556102 11,358 -300 1,603 0.1022
2016-11-14 2016-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 11,708 -3,252 2,650
2016-08-01 2016-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 14,960 -198 -1.31 2,210 2.98 0.1947
2016-05-13 2016-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 15,158 100 0.66 2,146 0.47 0.1943
2016-02-01 2015-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 15,058 -800 -5.04 2,136 10.16 0.2065
2015-11-02 2015-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 15,858 1,700 12.01 1,939 5.55 0.2134
2015-08-11 2015-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 14,158 0 0.00 1,837 -3.42 0.1900
2015-05-12 2015-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 14,158 -2,600 -15.51 1,902 -9.43 0.2055
2015-02-10 2014-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 16,758 4,900 41.32 2,100 45.53 0.2446
2014-10-15 2014-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 11,858 1,100 10.22 1,443 13.71 0.1940
2014-07-25 2014-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 10,758 900 9.13 1,269 7.09 0.1772
2014-04-14 2014-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 9,858 0 0.00 1,185 7.92 0.1737
2014-01-22 2013-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 9,858 0 0.00 1,098 20.93 0.1660
2013-10-16 2013-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 9,858 7,200 270.88 908 303.56 0.1519
2013-07-10 2013-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 2,658 2,658 225 0.0410
Disclosed Put Options
File
Date
Effective
Date
Form Security Class ID Opt Avg Share Price Shares ΔShares
(%)
Value
(x1000)
ΔValue
(%)
Prior Allocation
(%)
Allocation
(%)
ΔAllocation
(%)
Cost Basis
(x1000)
Profit
(x1000)
Return
(%)
2017-08-14 2017-06-30 13F THERMO FISHER SCIENTIFIC COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2017-11-28 2017-03-31 13F/A THERMO FISHER SCIENTIFIC COM Put 4,700 -6.00 8,030 910.06 n/a n/a n/a
2017-12-06 2016-09-30 13F/A THERMO FISHER SCIENTIFIC COM Put 5,000 9,900.00 795 7.58 n/a n/a n/a
2016-08-01 2016-06-30 13F THERMO FISHER SCIENTIFIC COM Put 50 -99.00 739 4.38 n/a n/a n/a
2016-05-13 2016-03-31 13F THERMO FISHER SCIENTIFIC COM Put 5,000 66.67 708 66.20 n/a n/a n/a
2016-02-01 2015-12-31 13F THERMO FISHER SCIENTIFIC COM Put 3,000 -51.61 426 -43.80 n/a n/a n/a
2015-11-02 2015-09-30 13F THERMO FISHER SCIENTIFIC COM Put 6,200 0.00 758 -5.84 n/a n/a n/a
2015-08-11 2015-06-30 13F THERMO FISHER SCIENTIFIC COM Put 6,200 0.00 805 -3.36 n/a n/a n/a
2015-05-12 2015-03-31 13F THERMO FISHER SCIENTIFIC COM Put 6,200 833 n/a n/a n/a
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.