TMO
Thermo Fisher Scientific Inc
Thermo Fisher Scientific Inc historical holders
total: 22
Viking Global Investors Thermo Fisher Scientific Inc transactions over time
- Total transactions:
- 36
- New positions:
- 4
- Sold out:
- 3
- Added:
- 13
- Reduced:
- 16
- Held since:
- 2025 Q4
- Held for:
- 2 quarters
- Latest activity:
- 2026 Q1
Ole Andreas Halvorsen has been an institutional investor in Thermo Fisher Scientific Inc (TMO) since at least 2013 Q2. According to 2026 Q1 report, Ole Andreas Halvorsen holds 1,668,025 shares with a market value of roughly $819.88M representing 2.29% of their equity portfolio. In our earliest available record from 2013 Q2, Viking Global Investors held about 8.69M shares of TMO. Ole Andreas Halvorsen later completely sold out the position and reinvested in TMO again in 2025 Q4. Since at least 2013 Q2, Viking Global Investors has made 35 more transactions in this position.
Does Ole Andreas Halvorsen still hold TMO?
Yes, Ole Andreas Halvorsen continues to hold Thermo Fisher Scientific Inc (TMO). According to their 2026 Q1 report, they maintain a position of 1,668,025 shares valued at approximately $819.88M, representing 2.29% of their equity portfolio.
Has Ole Andreas Halvorsen reinvested in TMO after selling?
Yes, Ole Andreas Halvorsen has shown renewed interest in Thermo Fisher Scientific Inc (TMO). After completely selling their position, they reinitiated an investment in 2025 Q4, demonstrating continued conviction in this ticker.
Estimated cost basis*
- Weighted AVG buy price:
- $533.34
TMO transactions history by Viking Global Investors
36 results
| Period |
% of portfolio |
Shares held after* |
Reported price* |
Value* |
% (shares) of activity |
% change to portfolio |
|---|---|---|---|---|---|---|
|
2026 Q1
|
2.29%
|
1,668,025
|
$491.53
|
$819,884,328
|
+110.29% (+874,838)
|
+1.2%
|
|
2025 Q4
|
1.22%
|
793,187
|
$579.45
|
$459,612,207
|
new
|
+1.22%
|
|
2024 Q2
|
0.00%
|
0
|
$581.21
|
|
-100% (-128,489)
|
-0.28%
|
|
2024 Q1
|
0.28%
|
128,489
|
$581.21
|
$74,679,092
|
-76.14% (-409,996)
|
-0.87%
|
|
2023 Q4
|
1.05%
|
538,485
|
$530.79
|
$285,822,453
|
-40.15% (-361,230)
|
-0.78%
|
|
2023 Q3
|
1.85%
|
899,715
|
$506.17
|
$455,408,742
|
+7.98% (+66,482)
|
+0.14%
|
|
2023 Q2
|
1.78%
|
833,233
|
$521.75
|
$434,739,318
|
-2.75% (-23,603)
|
-0.06%
|
|
2023 Q1
|
2.32%
|
856,836
|
$576.37
|
$493,854,565
|
+2.06% (+17,310)
|
+0.05%
|
|
2022 Q4
|
2.31%
|
839,526
|
$550.69
|
$462,318,573
|
+41.44% (+245,989)
|
+0.68%
|
|
2022 Q3
|
1.39%
|
593,537
|
$507.19
|
$301,036,000
|
-31.19% (-269,050)
|
-0.62%
|
|
2022 Q2
|
2.14%
|
$543.28
|
+77.96% (+377,891)
|
|||
|
2022 Q1
|
1.16%
|
$590.65
|
+129.65% (+273,638)
|
|||
|
2021 Q4
|
0.41%
|
$667.24
|
+15.82% (+28,821)
|
|||
|
2021 Q3
|
0.29%
|
$571.33
|
-81.98% (-829,164)
|
|||
|
2021 Q2
|
1.55%
|
$504.47
|
+17.35% (+149,514)
|
|||
|
2021 Q1
|
1.17%
|
$456.38
|
+1,007.58% (+784,070)
|
|||
|
2020 Q4
|
0.10%
|
$465.79
|
-94.35% (-1,299,406)
|
|||
|
2020 Q3
|
2.20%
|
$441.52
|
-20.58% (-356,921)
|
|||
|
2020 Q2
|
2.72%
|
$362.34
|
new
|
|||
|
2019 Q2
|
0.00%
|
$273.72
|
-100% (-1,146,037)
|
|||
|
2019 Q1
|
1.80%
|
$273.72
|
+109.17% (+598,131)
|
|||
|
2018 Q4
|
0.70%
|
$223.79
|
-70.82% (-1,329,914)
|
|||
|
2018 Q3
|
2.54%
|
$244.08
|
-24.29% (-602,542)
|
|||
|
2018 Q2
|
2.94%
|
$207.14
|
+186.85% (+1,615,681)
|
|||
|
2018 Q1
|
1.08%
|
$206.46
|
+6.16% (+50,164)
|
|||
|
2017 Q4
|
0.95%
|
$189.88
|
new
|
|||
|
2015 Q3
|
0.00%
|
$129.76
|
-100% (-207,527)
|
|||
|
2015 Q2
|
0.10%
|
$129.76
|
-94.12% (-3,324,310)
|
|||
|
2015 Q1
|
1.84%
|
$134.34
|
-38.96% (-2,254,673)
|
|||
|
2014 Q4
|
3.33%
|
$125.29
|
-27.46% (-2,189,992)
|
|||
|
2014 Q3
|
3.90%
|
$121.70
|
-3.56% (-294,778)
|
|||
|
2014 Q2
|
4.26%
|
$118.00
|
-14.45% (-1,397,359)
|
|||
|
2014 Q1
|
4.88%
|
$120.24
|
-6.81% (-707,017)
|
|||
|
2013 Q4
|
5.39%
|
$111.35
|
-1.85% (-195,114)
|
|||
|
2013 Q3
|
5.38%
|
$92.15
|
+21.65% (+1,881,170)
|
|||
|
2013 Q2
|
4.09%
|
$84.63
|
new or own*
|
|||
* Shares, change to shares, sold shares, shares held after: split-adjusted.
* Reported price: this doesn't represent the actual buy or sell price. It is the split-adjusted price of the security as of the last day of the reported period.
If the security is completely sold out, we show the reported split-adjusted price prior to the actual period.
If the security is completely sold out, we show the reported split-adjusted price prior to the actual period.
* Estimated cost basis: based on "Reported price*" (not earlier than 2013 Q2). Calculation starts from the latest "new buy" activity to the latest "close out" activity (if any).
* Value or Price: If the security is completely sold out, we show the reported value (or price) prior to the actual period.
* New buy or own: this means there is no earlier reporting (for us or in general). So we can't know if the actual purchase of the security happened at the reported period or earlier.