Main Street Research’s Thermo Fisher Scientific TMO Stock Holding History
Bought
Maintained
Sold
| Quarter | Market Value | Status | Shares |
Change in Stake | Trade Value | Portfolio Weight | Portfolio Position | |
|---|---|---|---|---|---|---|---|---|
|
2026
Q2 | $401K | Sell |
800
-100
| -11% | -$48K | 0.02% | 100 |
|
|
2026
Q1 | $442K | Sell |
900
-251
| -22% | -$136K | 0.03% | 90 |
|
|
2025
Q4 | $667K | Buy |
1,151
+155
| +16% | +$87.7K | 0.04% | 65 |
|
|
2025
Q3 | $483K | Buy |
996
+78
| +8% | +$36.3K | 0.03% | 86 |
|
|
2025
Q2 | $373K | Sell |
918
-336
| -27% | -$140K | 0.02% | 85 |
|
|
2025
Q1 | $625K | Sell |
1,254
-400
| -24% | -$217K | 0.04% | 66 |
|
|
2024
Q4 | $861K | Sell |
1,654
-64
| -4% | -$35.2K | 0.05% | 61 |
|
|
2024
Q3 | $1.06M | Buy |
1,718
+163
| +10% | +$96.5K | 0.07% | 59 |
|
|
2024
Q2 | $861K | Sell |
1,555
-50
| -3% | -$28.6K | 0.06% | 54 |
|
|
2024
Q1 | $934K | Buy |
1,605
+183
| +13% | +$103K | 0.06% | 55 |
|
|
2023
Q4 | $755K | Buy |
1,422
+218
| +18% | +$106K | 0.06% | 58 |
|
|
2023
Q3 | $610K | Sell |
1,204
-49
| -4% | -$26.1K | 0.06% | 62 |
|
|
2023
Q2 | $654K | Sell |
1,253
-6
| -0.5% | -$3.24K | 0.1% | 50 |
|
|
2023
Q1 | $726K | Sell |
1,259
-67
| -5% | -$37.8K | 0.14% | 44 |
|
|
2022
Q4 | $731K | Sell |
1,326
-46
| -3% | -$24.4K | 0.18% | 47 |
|
|
2022
Q3 | $696K | Buy |
1,372
+85
| +7% | +$47.6K | 0.15% | 46 |
|
|
2022
Q2 | $699K | Sell |
1,287
-80
| -6% | -$44K | 0.18% | 39 |
|
|
2022
Q1 | $807K | Sell |
1,367
-3
| -0.2% | -$1.72K | 0.08% | 53 |
|
|
2021
Q4 | $914K | Sell |
1,370
-85
| -6% | -$53.1K | 0.07% | 64 |
|
|
2021
Q3 | $831K | Buy |
1,455
+44
| +3% | +$24.1K | 0.07% | 65 |
|
|
2021
Q2 | $712K | Sell |
1,411
-70
| -5% | -$33K | 0.06% | 75 |
|
|
2021
Q1 | $676K | Buy |
1,481
+43
| +3% | +$20.5K | 0.06% | 74 |
|
|
2020
Q4 | $670K | Buy |
1,438
+69
| +5% | +$32.4K | 0.07% | 70 |
|
|
2020
Q3 | $604K | Sell |
1,369
-29
| -2% | -$12K | 0.08% | 69 |
|
|
2020
Q2 | $507K | Sell |
1,398
-303
| -18% | -$102K | 0.08% | 66 |
|
|
2020
Q1 | $482K | Buy |
1,701
+514
| +43% | +$162K | 0.12% | 51 |
|
|
2019
Q4 | $386K | Buy |
1,187
+32
| +3% | +$9.7K | 0.06% | 67 |
|
|
2019
Q3 | $336K | Hold |
1,155
| – | – | 0.06% | 68 |
|
|
2019
Q2 | $339K | Sell |
1,155
-50
| -4% | -$13.8K | 0.08% | 67 |
|
|
2019
Q1 | $330K | Sell |
1,205
-120
| -9% | -$29.9K | 0.1% | 65 |
|
|
2018
Q4 | $297K | Hold |
1,325
| – | – | 0.12% | 64 |
|
|
2018
Q3 | $323K | Hold |
1,325
| – | – | 0.05% | 83 |
|
|
2018
Q2 | $274K | Hold |
1,325
| – | – | 0.04% | 93 |
|
|
2018
Q1 | $274K | Sell |
1,325
-294
| -18% | -$61.7K | 0.04% | 90 |
|
|
2017
Q4 | $307K | Sell |
1,619
-160
| -9% | -$30.7K | 0.05% | 89 |
|
|
2017
Q3 | $337K | Buy |
1,779
+59
| +3% | +$10.7K | 0.05% | 88 |
|
|
2017
Q2 | $300K | Buy |
+1,720
| New | +$289K | 0.05% | 105 |
|
|
2016
Q4 | – | Sell |
-1,445
| Closed | -$230K | – | 119 |
|
|
2016
Q3 | $230K | Buy |
+1,445
| New | +$223K | 0.05% | 101 |
|
Other funds holding TMO
RG
ECSS
LT
Main Street Research's TMO Position: Q2 2026 in Review
Main Street Research reduced its Thermo Fisher Scientific (TMO) stake by 11% in Q2 2026, selling an estimated $48K and leaving 800 shares worth $401K. The position accounts for 0.02% of the portfolio, ranked #100.
Main Street Research first reported a position in TMO in Q3 2016 and has held it in 38 quarters since. The position peaked at $1.06M in Q3 2024. 1,092 funds tracked by Wall St. Rank hold TMO as of Q2 2026.
- Main Street Research held 800 shares of Thermo Fisher Scientific worth $401K as of Q2 2026.
- Main Street Research sold 100 Thermo Fisher Scientific shares in Q2 2026, an estimated $48K.
- Thermo Fisher Scientific made up 0.02% of Main Street Research's portfolio in Q2 2026, its #100 holding.
- Main Street Research first reported a position in Thermo Fisher Scientific in Q3 2016 and has held it in 38 quarters since.
- Main Street Research's Thermo Fisher Scientific position peaked at $1.06M in Q3 2024.
- 1,092 funds tracked by Wall St. Rank held Thermo Fisher Scientific as of Q2 2026.
Based on Main Street Research's 13F filing for Q2 2026, filed 29 Jul 2026.