Thermo Fisher Scientific Inc.
MX ˙ BMV ˙ US8835561023
SecurityMX:TMO / Thermo Fisher Scientific Inc.
InstitutionRMB Capital Management, LLC
Latest Disclosed Ownership46,597 shares
Latest Disclosed Value $ 22,920,578
RMB Capital Management, LLC ownership in TMO / Thermo Fisher Scientific Inc.

On May 15, 2026 - RMB Capital Management, LLC filed a 13F-HR form disclosing ownership of 46,597 shares of Thermo Fisher Scientific Inc. (MX:TMO) valued at $22,920,578 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 43,146 shares of Thermo Fisher Scientific Inc.. This represents a change in shares of 8.00% during the quarter.

RMB Capital Management, LLC 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 46,597 3,451 8.00 22,921 -8.37 0.4078
2026-02-17 2025-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 43,146 14,251 49.32 25,014 78.39 0.4334
2025-11-13 2025-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 28,895 1,354 4.92 14,023 25.50 0.2573
2025-08-14 2025-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 27,541 14,342 108.66 11,174 70.06 0.2121
2025-05-15 2025-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 13,199 -4,702 -26.27 6,571 -29.45 0.1620
2025-02-13 2024-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 17,901 418 2.39 9,313 -13.88 0.2146
2024-11-06 2024-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 17,483 1,000 6.07 10,814 18.63 0.2456
2024-08-13 2024-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 16,483 -2,579 -13.53 9,115 -17.73 0.2186
2024-05-15 2024-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 19,062 11,365 147.65 11,079 171.21 0.2539
2024-02-14 2023-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 7,697 420 5.77 4,085 10.92 0.1248
2023-11-13 2023-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 7,277 41 0.57 3,683 -2.44 0.1260
2023-08-11 2023-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 7,236 374 5.45 3,775 -4.53 0.1240
2023-05-11 2023-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 6,862 453 7.07 3,955 12.04 0.1382
2023-02-14 2022-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 6,409 -19 -0.30 3,529 8.25 0.1255
2022-11-14 2022-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 6,428 5,925 1,177.93 3,260 1,094.14 0.1214
2022-08-16 2022-06-30 13F/A-1 THERMO FISHER SCIENTIFIC COM 883556102 503 21 4.36 273 -4.21 0.0094
2022-08-01 2022-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 503 21 273 0.0102
2022-05-06 2022-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 482 0 0.00 285 -11.49 0.0090
2022-01-26 2021-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 482 -106 -18.03 322 -4.17 0.0097
2021-10-20 2021-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 588 106 21.99 336 38.27 0.0110
2021-08-13 2021-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 482 -519 -51.85 243 -46.83 0.0081
2021-05-12 2021-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,001 -221 -18.09 457 -19.68 0.0169
2021-02-11 2020-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,222 -695 -36.25 569 -32.74 0.0208
2020-11-10 2020-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 1,917 -102 -5.05 846 15.73 0.0366
2020-08-05 2020-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 2,019 -95 -4.49 731 21.83 0.0322
2020-05-11 2020-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 2,114 -14 -0.66 600 -13.17 0.0285
2020-02-13 2019-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 2,128 -10,632 -83.32 691 -81.40 0.0192
2019-11-12 2019-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 12,760 1,496 13.28 3,716 12.33 0.0977
2019-08-13 2019-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 11,264 872 8.39 3,308 16.27 0.0837
2019-05-15 2019-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 10,392 9,287 840.45 2,845 1,051.82 0.0719
2019-02-13 2018-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,105 -52 -4.49 247 -12.41 0.0063
2018-11-14 2018-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 1,157 2 0.17 282 17.99 0.0068
2018-08-13 2018-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 1,155 -4,153 -78.24 239 -78.19 0.0057
2018-05-14 2018-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 5,308 -4,200 -44.17 1,096 -39.28 0.0280
2018-02-14 2017-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 9,508 -49,147 -83.79 1,805 -83.74 0.0469
2017-11-14 2017-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 58,655 -935 -1.57 11,098 6.74 0.2867
2017-08-14 2017-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 59,590 59,590 10,397 0.2975
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
(%)
2026-05-15 2026-03-31 13F THERMO FISHER SCIENTIFIC COM Put 11,000 5,407 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.