William Blair & Company’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 | $85M | Buy |
172,953
+15,943
| +10% | +$8.65M | 0.24% | 94 |
|
|
2025
Q4 | $91M | Buy |
157,010
+22,886
| +17% | +$12.9M | 0.24% | 102 |
|
|
2025
Q3 | $65.1M | Sell |
134,124
-1,431
| -1% | -$666K | 0.17% | 125 |
|
|
2025
Q2 | $55M | Sell |
135,555
-5,255
| -4% | -$2.2M | 0.15% | 132 |
|
|
2025
Q1 | $70.1M | Sell |
140,810
-4,056
| -3% | -$2.2M | 0.21% | 108 |
|
|
2024
Q4 | $75.4M | Sell |
144,866
-1,547
| -1% | -$851K | 0.22% | 105 |
|
|
2024
Q3 | $90.6M | Sell |
146,413
-2,561
| -2% | -$1.52M | 0.27% | 89 |
|
|
2024
Q2 | $82.4M | Sell |
148,974
-3,298
| -2% | -$1.89M | 0.25% | 91 |
|
|
2024
Q1 | $88.5M | Sell |
152,272
-944
| -0.6% | -$530K | 0.28% | 89 |
|
|
2023
Q4 | $81.3M | Sell |
153,216
-2,072
| -1% | -$1M | 0.28% | 86 |
|
|
2023
Q3 | $78.6M | Buy |
155,288
+2,483
| +2% | +$1.32M | 0.3% | 78 |
|
|
2023
Q2 | $79.7M | Sell |
152,805
-4,929
| -3% | -$2.66M | 0.29% | 81 |
|
|
2023
Q1 | $90.9M | Sell |
157,734
-983
| -0.6% | -$554K | 0.36% | 69 |
|
|
2022
Q4 | $87.4M | Sell |
158,717
-504
| -0.3% | -$267K | 0.38% | 64 |
|
|
2022
Q3 | $80.8M | Buy |
159,221
+2,474
| +2% | +$1.38M | 0.37% | 69 |
|
|
2022
Q2 | $85.2M | Buy |
156,747
+7,449
| +5% | +$4.1M | 0.38% | 63 |
|
|
2022
Q1 | $88.2M | Sell |
149,298
-3,656
| -2% | -$2.1M | 0.31% | 79 |
|
|
2021
Q4 | $102M | Buy |
152,954
+2,189
| +1% | +$1.37M | 0.32% | 74 |
|
|
2021
Q3 | $86.1M | Sell |
150,765
-1,289
| -0.8% | -$707K | 0.29% | 82 |
|
|
2021
Q2 | $76.7M | Sell |
152,054
-2,309
| -1% | -$1.09M | 0.27% | 88 |
|
|
2021
Q1 | $70.4M | Buy |
154,363
+1,814
| +1% | +$866K | 0.27% | 85 |
|
|
2020
Q4 | $71.1M | Buy |
152,549
+12,135
| +9% | +$5.69M | 0.26% | 88 |
|
|
2020
Q3 | $62M | Buy |
140,414
+6,253
| +5% | +$2.58M | 0.26% | 85 |
|
|
2020
Q2 | $48.6M | Buy |
134,161
+5,244
| +4% | +$1.76M | 0.23% | 94 |
|
|
2020
Q1 | $36.6M | Sell |
128,917
-793
| -0.6% | -$250K | 0.23% | 96 |
|
|
2019
Q4 | $42.1M | Sell |
129,710
-3,468
| -3% | -$1.05M | 0.22% | 107 |
|
|
2019
Q3 | $38.8M | Sell |
133,178
-1,711
| -1% | -$490K | 0.22% | 101 |
|
|
2019
Q2 | $39.6M | Buy |
134,889
+3,019
| +2% | +$832K | 0.23% | 102 |
|
|
2019
Q1 | $36.1M | Sell |
131,870
-4,238
| -3% | -$1.05M | 0.22% | 105 |
|
|
2018
Q4 | $30.5M | Sell |
136,108
-4,280
| -3% | -$1M | 0.22% | 110 |
|
|
2018
Q3 | $34.3M | Buy |
140,388
+2,805
| +2% | +$645K | 0.21% | 113 |
|
|
2018
Q2 | $28.5M | Buy |
137,583
+10,085
| +8% | +$2.14M | 0.19% | 123 |
|
|
2018
Q1 | $26.3M | Buy |
127,498
+874
| +0.7% | +$183K | 0.19% | 120 |
|
|
2017
Q4 | $24M | Buy |
126,624
+4,641
| +4% | +$889K | 0.16% | 140 |
|
|
2017
Q3 | $23.1M | Buy |
121,983
+604
| +0.5% | +$109K | 0.17% | 136 |
|
|
2017
Q2 | $21.2M | Sell |
121,379
-16,297
| -12% | -$2.74M | 0.16% | 150 |
|
|
2017
Q1 | $21.4M | Buy |
137,676
+1,831
| +1% | +$280K | 0.17% | 143 |
|
|
2016
Q4 | $19.2M | Sell |
135,845
-1,428
| -1% | -$211K | 0.17% | 147 |
|
|
2016
Q3 | $21.8M | Buy |
137,273
+3,881
| +3% | +$598K | 0.19% | 133 |
|
|
2016
Q2 | $19.7M | Buy |
133,392
+1,176
| +0.9% | +$174K | 0.18% | 139 |
|
|
2016
Q1 | $18.7M | Buy |
132,216
+43,150
| +48% | +$5.78M | 0.18% | 141 |
|
|
2015
Q4 | $12.6M | Buy |
89,066
+1,182
| +1% | +$158K | 0.12% | 186 |
|
|
2015
Q3 | $10.7M | Buy |
87,884
+518
| +0.6% | +$67.5K | 0.09% | 213 |
|
|
2015
Q2 | $11.3M | Sell |
87,366
-3,633
| -4% | -$474K | 0.02% | 859 |
|
|
2015
Q1 | $12.2M | Sell |
90,999
-27,341
| -23% | -$3.52M | 0.02% | 795 |
|
|
2014
Q4 | $14.8M | Sell |
118,340
-47,005
| -28% | -$5.72M | 0.02% | 699 |
|
|
2014
Q3 | $20.1M | Sell |
165,345
-9,516
| -5% | -$1.16M | 0.03% | 575 |
|
|
2014
Q2 | $20.6M | Buy |
174,861
+1,965
| +1% | +$231K | 0.03% | 562 |
|
|
2014
Q1 | $20.8M | Buy |
172,896
+270
| +0.2% | +$32.1K | 0.03% | 536 |
|
|
2013
Q4 | $19.2M | Sell |
172,626
-18,181
| -10% | -$1.81M | 0.03% | 554 |
|
|
2013
Q3 | $17.6M | Buy |
190,807
+51,772
| +37% | +$4.68M | 0.03% | 544 |
|
|
2013
Q2 | $11.8M | Buy |
+139,035
| New | +$11.6M | 0.02% | 651 |
|
Other funds holding TMO
VCM
William Blair & Company's TMO Position: Q1 2026 in Review
William Blair & Company increased its Thermo Fisher Scientific (TMO) stake by 10% in Q1 2026, buying an estimated $8.65M and bringing the position to 172,953 shares worth $85M. The position accounts for 0.24% of the portfolio, ranked #94.
William Blair & Company first reported a position in TMO in Q2 2013 and has held it in 52 quarters since. The position peaked at $102M in Q4 2021. 2,590 funds tracked by Wall St. Rank hold TMO as of Q1 2026.
- William Blair & Company held 172,953 shares of Thermo Fisher Scientific worth $85M as of Q1 2026.
- William Blair & Company bought 15,943 Thermo Fisher Scientific shares in Q1 2026, an estimated $8.65M.
- Thermo Fisher Scientific made up 0.24% of William Blair & Company's portfolio in Q1 2026, its #94 holding.
- William Blair & Company first reported a position in Thermo Fisher Scientific in Q2 2013 and has held it in 52 quarters since.
- William Blair & Company's Thermo Fisher Scientific position peaked at $102M in Q4 2021.
- 2,590 funds tracked by Wall St. Rank held Thermo Fisher Scientific as of Q1 2026.
Based on William Blair & Company's 13F filing for Q1 2026, filed 8 May 2026.