Mario Gabelli's WM Position Overview
Mario Gabelli (via Gamco Investors, Inc. Et Al) currently holds 133,828 shares of Waste Management, Inc. (WM) worth $29.4 M, representing 0.28% of the portfolio. First purchased in 2013-Q2, this long-term strategic position has been held for 51 quarters.
Based on 13F filings since 2013, Mario Gabelli has maintained a long-term strategic position in WM, representing a significant commitment to this investment thesis. Largest addition occurred in Q2 2015, adding 236,100 shares. Largest reduction occurred in Q3 2015, reducing 163,000 shares.
Analysis based on 13F filings available since 2013 Q2
Mario Gabelli's Waste Management (WM) Holding Value Over Time
Track share changes against reported price movement
Quarterly Waste Management (WM) Trades by Mario Gabelli
| Report Date | Bought/Sold (Sh.) | % Change | Qtr. End Shares | Reported Price |
|---|---|---|---|---|
| Q4 2025 | +1,315 | Add 0.99% | 133,828 | $219.71 |
| Q3 2025 | -5,683 | Reduce 4.11% | 132,513 | $220.83 |
| Q2 2025 | -4,520 | Reduce 3.17% | 138,196 | $228.82 |
| Q1 2025 | -6,106 | Reduce 4.10% | 142,716 | $231.51 |
| Q4 2024 | -6,844 | Reduce 4.40% | 148,822 | $201.79 |
| Q3 2024 | -5,354 | Reduce 3.33% | 155,666 | $207.60 |
| Q2 2024 | -14,475 | Reduce 8.25% | 161,020 | $213.34 |
| Q1 2024 | -9,820 | Reduce 5.30% | 175,495 | $213.15 |
| Q4 2023 | -12,605 | Reduce 6.37% | 185,315 | $179.10 |
| Q3 2023 | -11,431 | Reduce 5.46% | 197,920 | $152.44 |
| Q2 2023 | -10,815 | Reduce 4.91% | 209,351 | $173.42 |
| Q1 2023 | -9,057 | Reduce 3.95% | 220,166 | $163.17 |
| Q4 2022 | -18,190 | Reduce 7.35% | 229,223 | $156.88 |
| Q3 2022 | -22,255 | Reduce 8.25% | 247,413 | $160.21 |
| Q2 2022 | -6,692 | Reduce 2.42% | 269,668 | $152.98 |
| Q1 2022 | -8,750 | Reduce 3.07% | 276,360 | $158.50 |
| Q4 2021 | -21,734 | Reduce 7.08% | 285,110 | $166.90 |
| Q3 2021 | -10,433 | Reduce 3.29% | 306,844 | $149.36 |
| Q2 2021 | -7,430 | Reduce 2.29% | 317,277 | $140.11 |
| Q1 2021 | -12,545 | Reduce 3.72% | 324,707 | $129.02 |
| Q4 2020 | -23,260 | Reduce 6.45% | 337,252 | $117.93 |
| Q3 2020 | -38,300 | Reduce 9.60% | 360,512 | $113.17 |
| Q2 2020 | -93,506 | Reduce 18.99% | 398,812 | $105.91 |
| Q1 2020 | -31,909 | Reduce 6.09% | 492,318 | $92.56 |
| Q4 2019 | -46,375 | Reduce 8.13% | 524,227 | $113.96 |
| Q3 2019 | -97,379 | Reduce 14.58% | 570,602 | $115.00 |
| Q2 2019 | -37,730 | Reduce 5.35% | 667,981 | $115.37 |
| Q1 2019 | -48,143 | Reduce 6.39% | 705,711 | $103.91 |
| Q4 2018 | -83,712 | Reduce 9.99% | 753,854 | $88.99 |
| Q3 2018 | -35,400 | Reduce 4.06% | 837,566 | $90.36 |
| Q2 2018 | -57,700 | Reduce 6.20% | 872,966 | $81.34 |
| Q1 2018 | -68,722 | Reduce 6.88% | 930,666 | $84.12 |
| Q4 2017 | -42,225 | Reduce 4.05% | 999,388 | $86.30 |
| Q3 2017 | -18,927 | Reduce 1.78% | 1.04 M | $78.27 |
| Q2 2017 | -65,925 | Reduce 5.85% | 1.06 M | $73.35 |
| Q1 2017 | -30,304 | Reduce 2.62% | 1.13 M | $72.92 |
| Q4 2016 | -44,720 | Reduce 3.72% | 1.16 M | $70.91 |
| Q3 2016 | -24,900 | Reduce 2.03% | 1.2 M | $63.76 |
| Q2 2016 | -40,330 | Reduce 3.18% | 1.23 M | $66.27 |
| Q1 2016 | -41,380 | Reduce 3.16% | 1.27 M | $59.00 |
| Q4 2015 | -17,400 | Reduce 1.31% | 1.31 M | $53.37 |
| Q3 2015 | -163,000 | Reduce 10.95% | 1.33 M | $49.81 |
| Q2 2015 | +236,100 | Add 18.85% | 1.49 M | $46.35 |
| Q1 2015 | +2,830 | Add 0.23% | 1.25 M | $54.23 |
| Q4 2014 | -26,678 | Reduce 2.09% | 1.25 M | $51.32 |
| Q3 2014 | +19,630 | Add 1.56% | 1.28 M | $47.53 |
| Q2 2014 | +38,850 | Add 3.19% | 1.26 M | $44.73 |
| Q1 2014 | -2,300 | Reduce 0.19% | 1.22 M | $42.07 |
| Q4 2013 | +28,100 | Add 2.36% | 1.22 M | $44.87 |
| Q3 2013 | +67,466 | Add 6.00% | 1.19 M | $41.24 |
| Q2 2013 | +1.12 M | Add 0.00% | 1.12 M | $40.33 |
Mario Gabelli's Waste Management Investment FAQs
Mario Gabelli first purchased Waste Management, Inc. (WM) in Q2 2013, acquiring 1,124,501 shares, as reported in their 13F filing for that period. Note: Analysis reflects filings available since Q2 2013; earlier records may be incomplete.
Mario Gabelli has held Waste Management, Inc. (WM) for 51 quarters since Q2 2013.
Mario Gabelli's largest addition to Waste Management, Inc. (WM) was in Q2 2013, adding 1,124,501 shares worth $45.35 M.
According to the latest 13F filing for Q4 2025, Mario Gabelli's firm, Gamco Investors, Inc. Et Al, owns 133,828 shares of Waste Management, Inc. (WM), valued at approximately $29.4 M.
As of the Q4 2025 filing, Waste Management, Inc. (WM) represents approximately 0.28% of Mario Gabelli's publicly disclosed stock portfolio, making it one of their key holdings.
Mario Gabelli's peak holding in Waste Management, Inc. (WM) was 1,488,499 shares, as reported at the end of Q2 2015.