Citadel Advisors’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
Q1 | $425M | Buy |
864,489
+174,084
| +25% | +$94.5M | 0.07% | 216 |
|
|
2025
Q4 | $400M | Buy |
690,405
+340,704
| +97% | +$193M | 0.06% | 246 |
|
|
2025
Q3 | $170M | Sell |
349,701
-747,122
| -68% | -$348M | 0.03% | 549 |
|
|
2025
Q2 | $445M | Buy |
1,096,823
+976,250
| +810% | +$408M | 0.08% | 182 |
|
|
2025
Q1 | $60M | Sell |
120,573
-219,367
| -65% | -$119M | 0.01% | 1022 |
|
|
2024
Q4 | $177M | Buy |
339,940
+173,754
| +105% | +$95.5M | 0.03% | 451 |
|
|
2024
Q3 | $103M | Sell |
166,186
-816,508
| -83% | -$483M | 0.02% | 677 |
|
|
2024
Q2 | $543M | Buy |
982,694
+882,024
| +876% | +$505M | 0.11% | 119 |
|
|
2024
Q1 | $58.5M | Sell |
100,670
-428,205
| -81% | -$240M | 0.01% | 1084 |
|
|
2023
Q4 | $281M | Buy |
528,875
+281,915
| +114% | +$136M | 0.06% | 233 |
|
|
2023
Q3 | $125M | Buy |
246,960
+121,162
| +96% | +$64.6M | 0.03% | 515 |
|
|
2023
Q2 | $65.6M | Sell |
125,798
-111,917
| -47% | -$60.4M | 0.01% | 843 |
|
|
2023
Q1 | $137M | Buy |
237,715
+86,060
| +57% | +$48.5M | 0.03% | 472 |
|
|
2022
Q4 | $83.5M | Buy |
151,655
+120,973
| +394% | +$64.1M | 0.02% | 751 |
|
|
2022
Q3 | $15.6M | Sell |
30,682
-242,002
| -89% | -$135M | ﹤0.01% | 2171 |
|
|
2022
Q2 | $148M | Buy |
272,684
+241,031
| +761% | +$133M | 0.04% | 393 |
|
|
2022
Q1 | $18.7M | Buy |
31,653
+8,372
| +36% | +$4.81M | ﹤0.01% | 2062 |
|
|
2021
Q4 | $15.5M | Sell |
23,281
-170,824
| -88% | -$107M | ﹤0.01% | 2361 |
|
|
2021
Q3 | $111M | Sell |
194,105
-187,607
| -49% | -$103M | 0.02% | 612 |
|
|
2021
Q2 | $193M | Buy |
381,712
+155,110
| +68% | +$73.2M | 0.04% | 335 |
|
|
2021
Q1 | $103M | Buy |
226,602
+124,572
| +122% | +$59.5M | 0.03% | 574 |
|
|
2020
Q4 | $47.5M | Buy |
102,030
+75,824
| +289% | +$35.6M | 0.01% | 979 |
|
|
2020
Q3 | $11.6M | Sell |
26,206
-12,260
| -32% | -$5.07M | ﹤0.01% | 2121 |
|
|
2020
Q2 | $13.9M | Sell |
38,466
-350,677
| -90% | -$118M | 0.01% | 1850 |
|
|
2020
Q1 | $110M | Buy |
389,143
+382,268
| +5,560% | +$121M | 0.05% | 304 |
|
|
2019
Q4 | $2.23M | Sell |
6,875
-9,935
| -59% | -$3.01M | ﹤0.01% | 4232 |
|
|
2019
Q3 | $4.9M | Sell |
16,810
-89,441
| -84% | -$25.6M | ﹤0.01% | 3140 |
|
|
2019
Q2 | $31.2M | Sell |
106,251
-622,976
| -85% | -$172M | 0.01% | 1035 |
|
|
2019
Q1 | $200M | Buy |
729,227
+502,851
| +222% | +$125M | 0.1% | 150 |
|
|
2018
Q4 | $50.7M | Buy |
226,376
+222,975
| +6,556% | +$52.3M | 0.03% | 610 |
|
|
2018
Q3 | $830K | Buy |
3,401
+2,423
| +248% | +$557K | ﹤0.01% | 5859 |
|
|
2018
Q2 | $203K | Sell |
978
-513,660
| -100% | -$109M | ﹤0.01% | 7873 |
|
|
2018
Q1 | $106M | Buy |
514,638
+265,537
| +107% | +$55.7M | 0.06% | 301 |
|
|
2017
Q4 | $47.3M | Sell |
249,101
-595,354
| -71% | -$114M | 0.03% | 647 |
|
|
2017
Q3 | $160M | Buy |
844,455
+700,283
| +486% | +$127M | 0.12% | 129 |
|
|
2017
Q2 | $25.2M | Sell |
144,172
-77,948
| -35% | -$13.1M | 0.02% | 851 |
|
|
2017
Q1 | $34.1M | Sell |
222,120
-420,555
| -65% | -$64.3M | 0.03% | 637 |
|
|
2016
Q4 | $90.7M | Buy |
642,675
+639,703
| +21,524% | +$94.3M | 0.09% | 193 |
|
|
2016
Q3 | $473K | Sell |
2,972
-157,276
| -98% | -$24.2M | ﹤0.01% | 4953 |
|
|
2016
Q2 | $23.7M | Buy |
+160,248
| New | +$23.7M | 0.03% | 663 |
|
|
2016
Q1 | – | Sell |
-780,000
| Closed | -$105M | – | 7954 |
|
|
2015
Q4 | $111M | Buy |
780,000
+151,727
| +24% | +$20.2M | 0.12% | 173 |
|
|
2015
Q3 | $76.8M | Buy |
628,273
+257,321
| +69% | +$33.5M | 0.07% | 267 |
|
|
2015
Q2 | $48.1M | Sell |
370,952
-6,206
| -2% | -$809K | 0.04% | 518 |
|
|
2015
Q1 | $50.7M | Sell |
377,158
-39,636
| -10% | -$5.11M | 0.05% | 479 |
|
|
2014
Q4 | $52.2M | Buy |
416,794
+112,058
| +37% | +$13.6M | 0.05% | 452 |
|
|
2014
Q3 | $37.1M | Buy |
304,736
+161,508
| +113% | +$19.6M | 0.04% | 560 |
|
|
2014
Q2 | $16.9M | Sell |
143,228
-47,601
| -25% | -$5.6M | 0.02% | 913 |
|
|
2014
Q1 | $22.9M | Sell |
190,829
-1,229,184
| -87% | -$146M | 0.03% | 749 |
|
|
2013
Q4 | $158M | Buy |
+1,420,013
| New | +$141M | 0.21% | 76 |
|
|
2013
Q3 | – | Sell |
-256,147
| Closed | -$23.2M | – | 6868 |
|
|
2013
Q2 | $21.7M | Buy |
+256,147
| New | +$21.3M | 0.04% | 619 |
|
Other funds holding TMO
VCM
Citadel Advisors's TMO Position: Q1 2026 in Review
Citadel Advisors increased its Thermo Fisher Scientific (TMO) stake by 25% in Q1 2026, buying an estimated $94.5M and bringing the position to 864,489 shares worth $425M. The position accounts for 0.07% of the portfolio, ranked #216.
Citadel Advisors first reported a position in TMO in Q2 2013 and has held it in 50 quarters since. The position peaked at $543M in Q2 2024. 2,587 funds tracked by Wall St. Rank hold TMO as of Q1 2026.
- Citadel Advisors held 864,489 shares of Thermo Fisher Scientific worth $425M as of Q1 2026.
- Citadel Advisors bought 174,084 Thermo Fisher Scientific shares in Q1 2026, an estimated $94.5M.
- Thermo Fisher Scientific made up 0.07% of Citadel Advisors's portfolio in Q1 2026, its #216 holding.
- Citadel Advisors first reported a position in Thermo Fisher Scientific in Q2 2013 and has held it in 50 quarters since.
- Citadel Advisors's Thermo Fisher Scientific position peaked at $543M in Q2 2024.
- 2,587 funds tracked by Wall St. Rank held Thermo Fisher Scientific as of Q1 2026.
Based on Citadel Advisors's 13F filing for Q1 2026, filed 15 May 2026.