Thermo Fisher Scientific Inc.
MX ˙ BMV ˙ US8835561023
SecurityMX:TMO / Thermo Fisher Scientific Inc.
InstitutionVontobel Holding Ltd.
Latest Disclosed Ownership601,220 shares
Latest Disclosed Value $ 295,517,666
Vontobel Holding Ltd. ownership in TMO / Thermo Fisher Scientific Inc.

On May 8, 2026 - Vontobel Holding Ltd. filed a 13F-HR form disclosing ownership of 601,220 shares of Thermo Fisher Scientific Inc. (MX:TMO) valued at $295,517,666 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 661,892 shares of Thermo Fisher Scientific Inc.. This represents a change in shares of -9.17% during the quarter.

Vontobel Holding Ltd. has a history of taking positions in derivatives of the underlying security (TMO) in the form of stock options. The firm currently holds call options representing 0 of underlying shares valued at $0 USD .

Note: prior versions of this page mistakenly stated that the share values represented the number of options, not the number of underlying shares. For more information on the data backing these reports, please see the SEC document Frequently Asked Questions About Form 13F.

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)
2026-05-08 2026-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 601,220 -60,672 -9.17 295,518 -22.95 1.0159
2026-02-13 2025-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 661,892 -152,179 -18.69 383,533 -2.86 1.2080
2025-10-15 2025-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 814,071 -275,032 -25.25 394,841 -10.59 1.1923
2025-07-23 2025-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 1,089,103 46,743 4.48 441,588 -14.86 1.4069
2025-04-28 2025-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,042,360 116,443 12.58 518,678 7.68 1.8910
2025-01-30 2024-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 925,917 132,320 16.67 481,690 -1.88 1.6483
2024-10-16 2024-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 793,597 -27,364 -3.33 490,895 8.13 1.5847
2024-08-13 2024-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 820,961 667,250 434.09 453,991 408.17 1.4744
2024-05-10 2024-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 153,711 -6,464 -4.04 89,338 5.08 0.7143
2024-06-04 2023-12-31 13F/A-1 THERMO FISHER SCIENTIFIC COM 883556102 160,175 10,663 7.13 85,019 12.34 0.7121
2024-01-30 2023-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 267,853 118,341 142,174 0.7139
2024-06-04 2023-09-30 13F/A-1 THERMO FISHER SCIENTIFIC COM 883556102 149,512 -4,020 -2.62 75,678 -5.53 0.6989
2023-10-11 2023-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 249,980 -5,255 126,532 0.7058
2024-06-04 2023-06-30 13F/A-1 THERMO FISHER SCIENTIFIC COM 883556102 153,532 -1,832 -1.18 80,105 -10.54 0.7028
2023-07-24 2023-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 255,235 99,871 133,169 0.7064
2024-06-04 2023-03-31 13F/A-1 THERMO FISHER SCIENTIFIC COM 883556102 155,364 -6,854 -4.23 89,547 1.58 0.8332
2023-04-12 2023-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 258,642 96,424 149,073 0.8480
2023-02-14 2022-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 162,218 -93,819 -36.64 88,151 -32.12 0.8897
2022-11-04 2022-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 256,037 -20,622 -7.45 129,859 -12.42 1.5162
2022-07-27 2022-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 276,659 3,148 1.15 148,267 -8.92 1.6029
2022-05-13 2022-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 273,511 12,970 4.98 162,779 -6.11 1.4069
2022-02-14 2021-12-31 13F/A-1 THERMO FISHER SCIENTIFIC COM 883556102 260,541 10,086 4.03 173,377 21.16 1.4408
2022-02-10 2021-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 250,455 0 143,092 0.5431
2021-10-29 2021-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 250,455 17,422 7.48 143,092 20.82 1.2622
2021-08-06 2021-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 233,033 12,531 5.68 118,437 17.69 1.0233
2021-05-11 2021-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 220,502 23,913 12.16 100,633 3.26 0.7460
2021-02-12 2020-12-31 13F/A-1 THERMO FISHER SCIENTIFIC COM 883556102 196,589 196,589 97,460 0.6388
2021-02-12 2020-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 196,589 97,460 0.6388
Disclosed Call 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
(%)
2026-02-13 2025-12-31 13F THERMO FISHER SCIENTIFIC COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2025-10-15 2025-09-30 13F THERMO FISHER SCIENTIFIC COM Call 400 194 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.