WEITZ INVESTMENT MANAGEMENT, INC.: THERMO FISHER SCIENTIFIC INC (TMO): Quarterly 13F Position History
As of Q1 2026, WEITZ INVESTMENT MANAGEMENT, INC. reported 121,000 shares of THERMO FISHER SCIENTIFIC INC (TMO), worth $59.5M and representing 4.2% of its 13F equity book. Quarter-over-quarter share count change: 13,950 (-10.3%) . The position first appeared in Q4 2016 and has been disclosed across 38 13F-HR filings in Pactolio's tracked window.
- 121,000Shares Held (Latest Filing)
- $59.5MReported Market Value (Latest Filing)
- 4.2%Portfolio Weight (% of 13F Equity Book)
- 13,950Quarter-over-Quarter Share Change
- -$18.7MQuarter-over-Quarter Value Change
- 150,450Peak Reported Shares (Historical)
Quarterly 13F-HR Disclosure History Source: SEC 13F-HR filings, 38 quarter s
| Quarter | Shares | QoQ Share Change | Share Change (%) | Market Value | Weight | Implied Price |
|---|---|---|---|---|---|---|
| Q1 2026 | 121,000 | 13,950 | -10.3% | $59.5M | 4.2% | $491.5 |
| Q4 2025 | 134,950 | 15,500 | -10.3% | $78.2M | 4.6% | $579.5 |
| Q3 2025 | 150,450 | 0 | — | $73.0M | 4.0% | $485.0 |
| Q2 2025 | 150,450 | +24,300 | +19.3% | $61.0M | 3.3% | $405.5 |
| Q1 2025 | 126,150 | +5,950 | +5.0% | $62.8M | 3.3% | $497.6 |
| Q4 2024 | 120,200 | 0 | — | $62.5M | 3.2% | $520.2 |
| Q3 2024 | 120,200 | 5,000 | -4.0% | $74.4M | 3.7% | $618.6 |
| Q2 2024 | 125,200 | 0 | — | $69.2M | 3.6% | $553.0 |
| Q1 2024 | 125,200 | +120 | +0.1% | $72.8M | 3.7% | $581.2 |
| Q4 2023 | 125,080 | 0 | — | $66.4M | 3.5% | $530.8 |
| Q3 2023 | 125,080 | +21,380 | +20.6% | $63.3M | 3.5% | $506.2 |
| Q2 2023 | 103,700 | +35,740 | +52.6% | $54.1M | 2.9% | $521.8 |
| Q1 2023 | 67,960 | 0 | — | $39.2M | 2.3% | $576.4 |
| Q4 2022 | 67,960 | 5,000 | -6.9% | $37.4M | 2.1% | $550.7 |
| Q3 2022 | 72,960 | 5,382 | -6.9% | $37.0M | 2.2% | $507.2 |
| Q2 2022 | 78,342 | 0 | — | $42.6M | 2.2% | $543.3 |
| Q1 2022 | 78,342 | 0 | — | $46.3M | 2.0% | $590.7 |
| Q4 2021 | 78,342 | 4,658 | -5.6% | $52.3M | 2.1% | $667.2 |
| Q3 2021 | 83,000 | 0 | — | $47.4M | 2.0% | $571.3 |
| Q2 2021 | 83,000 | 0 | — | $41.9M | 1.8% | $504.5 |
| Q1 2021 | 83,000 | +1,500 | +1.8% | $37.9M | 1.7% | $456.4 |
| Q4 2020 | 81,500 | 13,500 | -14.2% | $38.0M | 1.6% | $465.8 |
| Q3 2020 | 95,000 | 15,000 | -13.6% | $41.9M | 2.0% | $441.5 |
| Q2 2020 | 110,000 | 0 | — | $39.9M | 2.0% | $362.3 |
| Q1 2020 | 110,000 | 0 | — | $31.2M | 1.7% | $283.6 |
| Q4 2019 | 110,000 | 0 | — | $35.7M | 1.4% | $324.9 |
| Q3 2019 | 110,000 | 0 | — | $32.0M | 1.3% | $291.3 |
| Q2 2019 | 110,000 | +5,000 | +4.8% | $32.3M | 1.3% | $293.7 |
| Q1 2019 | 105,000 | 873 | -0.8% | $28.7M | 1.2% | $273.7 |
| Q4 2018 | 105,873 | 10,051 | -8.7% | $23.7M | 1.1% | $223.8 |
| Q3 2018 | 115,924 | 15,500 | -11.8% | $28.3M | 1.2% | $244.1 |
| Q2 2018 | 131,424 | 157 | -0.1% | $27.2M | 1.2% | $207.1 |
| Q1 2018 | 131,581 | 144 | -0.1% | $27.2M | 1.1% | $206.5 |
| Q4 2017 | 131,725 | 0 | — | $25.0M | 1.0% | $189.9 |
| Q3 2017 | 131,725 | +180 | +0.1% | $24.9M | 1.0% | $189.2 |
| Q2 2017 | 131,545 | 4,000 | -3.0% | $23.0M | 1.0% | $174.5 |
| Q1 2017 | 135,545 | +3,385 | +2.6% | $20.8M | 0.9% | $153.6 |
| Q4 2016 | 132,160 | — | — | $18.6M | 0.7% | $141.1 |
Methodology & FAQ
How This Position History Is Sourced
Each row is one SEC Form 13F-HR filing disclosing this position. Share count, market value, and reported quarter are taken verbatim from the filing; portfolio weight is recomputed against the same filing's total reported equity book. Implied price-per-share is market value divided by shares — a quarter-end mark, not the manager's cost basis. See the full methodology document for the normalization rules.
When did WEITZ INVESTMENT MANAGEMENT, INC. first disclose a TMO position in 13F-HR filings?
WEITZ INVESTMENT MANAGEMENT, INC. first reported THERMO FISHER SCIENTIFIC INC (TMO) on its 13F-HR filing for the period ending 2016-12-31 (Q4 2016). The position has appeared on 38 reported quarters within Pactolio's tracked window.
What was WEITZ INVESTMENT MANAGEMENT, INC.'s most recent quarter-over-quarter share-count change in TMO?
Between Q4 2025 and Q1 2026, WEITZ INVESTMENT MANAGEMENT, INC. reduced its TMO position by 13,950 shares (-10.3%), leaving 121,000 shares at a market value of $59.5M.
Does the implied price-per-share represent WEITZ INVESTMENT MANAGEMENT, INC.'s cost basis in TMO?
No. The implied price-per-share column is the 13F-HR reported market value divided by reported share count on the filing date (end of quarter). It is a quarter-end mark, not a cost basis or transaction price. Use it as a sanity check on the value column, not as an indicator of the manager's entry or exit price.