WMS · Insider trading · 13F holders · Congress trades
Advanced Drainage Systems, Inc. (WMS)
Who is buying and selling WMS: company insiders on SEC Form 4, hedge funds and superinvestors on Form 13F, and members of Congress under the STOCK Act. Every figure links to the filing or page it comes from.
- 13F filers holding
- 34
- Insider buys, 90 days
- $0
- Insider sales, 90 days
- $0
- Congress trades, 12 months
- 3
WMS at a glance
- No open-market insider purchases or sales of WMS were filed in the last 90 days.
- 34 13F filers hold WMS among their 50 largest positions, worth $1.2B combined, including Steven Schonfeld. The biggest bets by portfolio weight are Owls Nest Partners IA, LLC (10.8%), ACK Asset Management LLC (7.1%) and Triodos Investment Management BV (5.0%). In their latest 13Fs, 1 manager opened a new position and 8 added to one.
- Members of Congress have disclosed 7 WMS trades since 2015, 1 purchase and 2 sales in the past year; the latest was Tommy Tuberville (R-AL), selling $1K–15K on May 7, 2024.
- WMS last closed at $136.04 on Oct 30, 2026.
WMS insider trading
No open-market insider purchases or sales of WMS were filed in the last 90 days.
Who owns WMS? Hedge funds and superinvestors
34 13F filers hold WMS among their 50 largest positions, worth $1.2B combined, including Steven Schonfeld. The biggest bets by portfolio weight are Owls Nest Partners IA, LLC (10.8%), ACK Asset Management LLC (7.1%) and Triodos Investment Management BV (5.0%). In their latest 13Fs, 1 manager opened a new position and 8 added to one.
Superinvestors holding WMS: Steven Schonfeld 0.4%
| Manager | % of portfolio | Value | Shares | Last quarter | 13F |
|---|---|---|---|---|---|
| Impax Asset Management Group plcMutual fund manager | 1.9% | $289.7M | 1,845,942 | -4.2% shares | Q2 2026 |
| Impactive Capital LPHedge fund | 8.8% | $122.9M | 782,790 | -8.6% shares | Q2 2026 |
| Mirova US LLCHedge fund | 1.0% | $97.2M | 619,117 | -1.5% shares | Q2 2026 |
| Liontrust Investment Partners LLPInvestment manager | 1.3% | $87.7M | 558,705 | +6.5% shares | Q2 2026 |
| Triodos Investment Management BVAsset manager | 5.0% | $82.9M | 528,311 | -1.6% shares | Q2 2026 |
| Hill City Capital, LPHedge fund | 1.8% | $75.3M | 480,000 | +29.7% shares | Q2 2026 |
| Steven SchonfeldHedge fund | 0.4% | $72.2M | 460,060 | -6.0% shares | Q2 2026 |
| Interval Partners, LPHedge fund | 2.3% | $71.0M | 452,250 | +16.3% shares | Q2 2026 |
| ACK Asset Management LLCHedge fund | 7.1% | $61.2M | 390,000 | +0.0% shares | Q2 2026 |
| Geneva Capital Management LLCAsset manager | 0.9% | $38.6M | 245,893 | -3.9% shares | Q2 2026 |
| Robeco Schweiz AGInvestment manager | 0.6% | $34.4M | 271,480 | -0.1% shares | Q3 2026 |
| Owls Nest Partners IA, LLCHedge fund | 10.8% | $33.3M | 211,839 | -19.8% shares | Q2 2026 |
| PGGM InvestmentsAsset manager | 0.7% | $29.9M | 190,291 | — | Q2 2026 |
| MirovaHedge fund | 1.0% | $27.2M | 173,559 | +0.8% shares | Q2 2026 |
| Cramer Rosenthal Mcglynn LLCAsset manager | 1.1% | $22.5M | 143,426 | +19.7% shares | Q2 2026 |
| Lombard Odier Asset Management (Europe) LtdAsset manager | 0.9% | $12.9M | 82,032 | -26.2% shares | Q2 2026 |
| Pier Capital, LLCAsset manager | 1.3% | $10.1M | 64,151 | +0.5% shares | Q2 2026 |
| HITE Hedge Asset Management LLCHedge fund | 0.5% | $9.5M | 60,437 | — | Q2 2026 |
| EDENTREE ASSET MANAGEMENT LtdAsset manager | 2.4% | $7.9M | 50,200 | -8.8% shares | Q2 2026 |
| Prentiss Smith & Co IncWealth manager | 3.0% | $5.3M | 41,935 | -2.9% shares | Q3 2026 |
| Future Fund LLCSovereign wealth fund | 1.3% | $4.6M | 29,057 | +6.3% shares | Q2 2026 |
| Rik Saylor Financial, Inc.Wealth manager | 2.7% | $4.0M | 25,596 | +11.7% shares | Q2 2026 |
| Gryphon Financial Partners LLCWealth manager | 0.4% | $4.0M | 25,447 | -7.3% shares | Q2 2026 |
| Alpine Peaks Capital, LPHedge fund | 4.7% | $4.0M | 25,344 | -17.4% shares | Q2 2026 |
| Vision Capital Management, Inc.Wealth manager | 0.4% | $3.6M | 28,314 | -1.9% shares | Q3 2026 |
| VARCOV Co.Hedge fund | 1.2% | $3.2M | 20,190 | — | Q2 2026 |
| Montanaro Asset Management LtdAsset manager | 0.9% | $2.8M | 17,900 | +65.7% shares | Q2 2026 |
| Bell Asset Management LtdInstitutional asset manager | 0.9% | $2.5M | 19,871 | -32.9% shares | Q3 2026 |
| Corbyn Investment Management Inc/mdAsset manager | 1.0% | $2.4M | 15,263 | +0.0% shares | Q2 2026 |
| Cannon Advisors, Inc.Wealth manager | 0.9% | $1.6M | 12,398 | -2.6% shares | Q3 2026 |
The 30 largest of 34 positions, by value. Each manager counts with its latest 13F (Q3 2026: 7, Q2 2026: 27). Screen WMS in the grand portfolio →
WMS stock trades by members of Congress
Members of Congress have disclosed 7 WMS trades since 2015, 1 purchase and 2 sales in the past year; the latest was Tommy Tuberville (R-AL), selling $1K–15K on May 7, 2024.
| Filed | Member | Trade | Amount | Traded | Since |
|---|---|---|---|---|---|
| Aug 5, 2026 | Tommy TubervilleR-AL · Senate | Sale | $1K–15K | May 7, 2024 | -19.1% |
| Aug 13, 2025 | Lisa C. McClainR-MI · House | Sale | $1K–15K | Jul 16, 2025 | +23.1% |
| Aug 13, 2025 | Lisa C. McClainR-MI · House | Buy | $1K–15K | Jun 17, 2025 | +20.2% |
| Feb 13, 2025 | Robert P. Bresnahan, Jr.R-PA · House | Sale | $1K–15K | Jan 13, 2025 | +18.7% |
| Nov 16, 2023 | Tommy TubervilleR-AL · Senate | Buy | $1K–15K | Oct 17, 2023 | +15.1% |
| Mar 11, 2016 | Suzan K. DelBeneD-WA · House | Sale | $15K–50K | Feb 2, 2016 | +579.3% |
| Apr 16, 2015 | Suzan K. DelBeneD-WA · House | Buy | $15K–50K | Mar 6, 2015 | +390.9% |
4 members have traded WMS: Tommy Tuberville, Lisa C. McClain, Robert P. Bresnahan, Jr., Suzan K. DelBene.
WMS questions and answers
Are insiders buying WMS stock?
No open-market insider purchases or sales of WMS were filed in the last 90 days.
Which hedge funds own WMS?
34 13F filers hold WMS among their 50 largest positions, worth $1.2B combined, including Steven Schonfeld. The biggest bets by portfolio weight are Owls Nest Partners IA, LLC (10.8%), ACK Asset Management LLC (7.1%) and Triodos Investment Management BV (5.0%). In their latest 13Fs, 1 manager opened a new position and 8 added to one.
Has Congress traded WMS?
Members of Congress have disclosed 7 WMS trades since 2015, 1 purchase and 2 sales in the past year; the latest was Tommy Tuberville (R-AL), selling $1K–15K on May 7, 2024.
Who is the largest holder of WMS?
Among 13F filers, Impax Asset Management Group plc reports the largest WMS position, $289.7M (1,845,942 shares) in its Q2 2026 13F. The biggest bet by portfolio weight is Owls Nest Partners IA, LLC's: 10.8% of its portfolio.
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