Thermo Fisher Scientific Inc.
MX ˙ BMV ˙ US8835561023
SecurityMX:TMO / Thermo Fisher Scientific Inc.
InstitutionTemasek Holdings (Private) Ltd
Latest Disclosed Ownership1,195,799 shares
Latest Disclosed Value $ 587,771,082
Temasek Holdings (Private) Ltd ownership in TMO / Thermo Fisher Scientific Inc.

On May 12, 2026 - Temasek Holdings (Private) Ltd filed a 13F-HR form disclosing ownership of 1,195,799 shares of Thermo Fisher Scientific Inc. (MX:TMO) valued at $587,771,082 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 891,418 shares of Thermo Fisher Scientific Inc.. This represents a change in shares of 34.15% during the quarter.

Temasek Holdings (Private) Ltd 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)
2026-05-12 2026-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,195,799 304,381 34.15 587,771 13.79 1.9281
2026-02-17 2025-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 891,418 -216,172 -19.52 516,532 -3.85 1.6359
2025-11-14 2025-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 1,107,590 -35,897 -3.14 537,203 15.87 1.8536
2025-08-14 2025-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 1,143,487 -114,630 -9.11 463,638 -25.94 1.7726
2025-05-16 2025-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,258,117 200,869 19.00 626,039 13.82 2.5198
2025-02-14 2024-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,057,248 -13,932 -1.30 550,012 -16.99 2.1693
2024-11-14 2024-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 1,071,180 2,813 0.26 662,600 12.15 2.6836
2024-08-14 2024-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 1,068,367 36,164 3.50 590,807 -1.52 2.7435
2024-05-15 2024-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,032,203 -227,334 -18.05 599,927 -10.26 3.3214
2024-02-14 2023-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,259,537 77,195 6.53 668,550 11.71 3.7421
2023-11-14 2023-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 1,182,342 29,601 2.57 598,466 -0.49 3.5616
2023-08-14 2023-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 1,152,741 146,812 14.59 601,443 3.73 3.4829
2023-05-15 2023-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,005,929 0 0.00 579,787 4.66 3.4406
2023-05-15 2022-12-31 13F/A-2 THERMO FISHER SCIENTIFIC COM 883556102 1,005,929 187 0.02 553,955 8.60 3.2378
2023-04-05 2022-12-31 13F/A-1 THERMO FISHER SCIENTIFIC COM 883556102 1,005,929 187 553,955 3.2397
2023-02-14 2022-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,005,929 187 553,955 3.2397
2023-05-15 2022-09-30 13F/A-2 THERMO FISHER SCIENTIFIC COM 883556102 1,005,742 -565,755 -36.00 510,102 -40.25 3.0534
2023-04-05 2022-09-30 13F/A-1 THERMO FISHER SCIENTIFIC COM 883556102 1,005,742 -565,755 510 3.0562
2022-11-14 2022-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 1,005,742 -565,755 510,102 3.0461
2023-05-15 2022-06-30 13F/A-1 THERMO FISHER SCIENTIFIC COM 883556102 1,571,497 6,211 0.40 853,763 -7.66 4.6769
2022-08-15 2022-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 1,571,497 6,211 853,763 4.6575
2023-05-15 2022-03-31 13F/A-2 THERMO FISHER SCIENTIFIC COM 883556102 1,565,286 -23,165 -1.46 924,536 -12.77 3.8944
2022-06-24 2022-03-31 13F/A-1 THERMO FISHER SCIENTIFIC COM 883556102 1,565,286 -23,165 924,536 3.8575
2022-05-16 2022-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,565,286 -23,165 924,536 3.8991
2022-02-14 2021-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,588,451 0 0.00 1,059,878 16.79 3.8256
2022-01-25 2021-09-30 13F/A-1 THERMO FISHER SCIENTIFIC COM 883556102 1,588,451 -23,710 -1.47 907,530 11.59 3.1752
2021-11-15 2021-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 1,588,451 -23,710 907,530 3.1752
2021-11-15 2021-06-30 13F/A-1 THERMO FISHER SCIENTIFIC COM 883556102 1,612,161 109,074 7.26 813,287 18.56 2.7222
2021-08-16 2021-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 1,612,161 109,074 813,287 2.3688
2021-05-17 2021-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,503,087 0 0.00 685,979 -2.02 2.6876
2021-02-16 2020-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,503,087 0 0.00 700,108 5.49 3.0073
2020-11-16 2020-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 1,503,087 -34,825 -2.26 663,643 19.09 3.3691
2020-08-14 2020-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 1,537,912 0 0.00 557,247 27.76 3.3270
2020-05-15 2020-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,537,912 34,825 2.32 436,152 -10.68 3.2151
2020-02-14 2019-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,503,087 0 0.00 488,308 11.54 3.1934
2019-11-14 2019-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 1,503,087 0 0.00 437,804 -0.82 3.2075
2019-08-14 2019-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 1,503,087 0 0.00 441,427 7.29 3.1541
2019-05-15 2019-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,503,087 0 0.00 411,425 22.31 2.8484
2019-02-14 2018-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,503,087 0 0.00 336,376 -8.31 2.3157
2018-11-14 2018-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 1,503,087 0 0.00 366,873 17.83 2.1341
2018-08-14 2018-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 1,503,087 0 0.00 311,349 0.33 1.6367
2018-05-15 2018-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,503,087 0 0.00 310,327 8.73 1.7020
2018-02-14 2017-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,503,087 0 0.00 285,406 0.36 1.7542
2017-11-14 2017-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 1,503,087 0 0.00 284,384 8.44 1.6558
2017-08-14 2017-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 1,503,087 -111,600 -6.91 262,244 5.74 1.6904
2017-05-15 2017-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 1,614,687 -1,284,628 -44.31 248,016 -39.37 1.8493
2017-02-14 2016-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 2,899,315 0 0.00 409,093 -11.29 3.2741
2016-11-14 2016-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 2,899,315 0 0.00 461,165 7.65 3.7350
2016-08-15 2016-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 2,899,315 0 0.00 428,403 4.36 3.3472
2016-05-16 2016-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 2,899,315 0 0.00 410,514 -0.18 3.2350
2016-02-16 2015-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 2,899,315 0 0.00 411,268 16.00 3.1226
2015-11-16 2015-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 2,899,315 -2,372,166 -45.00 354,528 -48.17 3.3648
2015-08-14 2015-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 5,271,481 0 0.00 684,027 -3.41 4.2756
2015-05-15 2015-03-31 13F THERMO FISHER SCIENTIFIC COM 883556102 5,271,481 0 0.00 708,171 7.22 5.3061
2015-02-13 2014-12-31 13F THERMO FISHER SCIENTIFIC COM 883556102 5,271,481 0 0.00 660,464 2.95 6.8643
2014-11-14 2014-09-30 13F THERMO FISHER SCIENTIFIC COM 883556102 5,271,481 0 0.00 641,539 3.14 6.8201
2014-08-14 2014-06-30 13F THERMO FISHER SCIENTIFIC COM 883556102 5,271,481 0 0.00 622,035 -1.86 9.3192
2014-05-15 2014-03-31 13F THERMO FISHER SSCIENTIFIC COM 883556102 5,271,481 5,271,481 633,843 9.8258
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
(%)
2026-05-12 2026-03-31 13F THERMO FISHER SCIENTIFIC COM Put 51,600 25,363 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.