Ranked by reported Q1 2026 13F market value
Share of total reported institutional value in WMS held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | BlackRock, Inc. | 7.4M | $1.02B | +4.4% | 9.691% | 0.02% |
| 2 | VANGUARD PORTFOLIO MANAGEMENT LLC | 3.6M | $495.8M | — | 4.720% | 0.03% |
| 3 | VANGUARD CAPITAL MANAGEMENT LLC | 3.4M | $469.5M | — | 4.470% | 0.01% |
| 4 | STATE STREET CORP | 2.5M | $341.4M | +0.8% | 3.250% | 0.01% |
| 5 | UBS ASSET MANAGEMENT AMERICAS INC | 2.5M | $336.0M | -4.1% | 3.199% | 0.07% |
| 6 | Pictet Asset Management Holding SA | 2.2M | $302.3M | +32.9% | 2.879% | 0.32% |
| 7 | BAILLIE GIFFORD & CO | 2.0M | $280.8M | -8.8% | 2.673% | 0.29% |
| 8 | FIRST TRUST ADVISORS LP | 2.0M | $280.3M | -15.6% | 2.669% | 0.20% |
| 9 | Impax Asset Management Group plc | 1.9M | $264.3M | -6.7% | 2.517% | 1.84% |
| 10 | AMERICAN CENTURY COMPANIES INC | 1.7M | $227.3M | +9.5% | 2.164% | 0.12% |
| 11 | GEODE CAPITAL MANAGEMENT, LLC | 1.3M | $184.5M | +5.8% | 1.756% | 0.01% |
| 12 | MORGAN STANLEY | 1.3M | $182.8M | -22.0% | 1.741% | 0.01% |
| 13 | Amundi | 1.3M | $176.7M | +0.7% | 1.682% | 0.05% |
| 14 | DIMENSIONAL FUND ADVISORS LP | 1.2M | $163.4M | +0.2% | 1.556% | 0.03% |
| 15 | KAYNE ANDERSON RUDNICK INVESTMENT MANAGEMENT LLC | 1.1M | $151.7M | -7.1% | 1.444% | 0.45% |
| 16 | WELLINGTON MANAGEMENT GROUP LLP | 1.1M | $145.8M | -15.9% | 1.388% | 0.03% |
| 17 | Invesco Ltd. | 983K | $134.7M | -0.2% | 1.283% | 0.02% |
| 18 | Impactive Capital LP | 856K | $117.5M | -41.3% | 1.118% | 8.52% |
| 19 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 703K | $96.4M | -2.1% | 0.917% | 0.01% |
| 20 | WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC | 656K | $89.9M | -4.7% | 0.856% | 0.30% |
| 21 | Capital International Investors | 639K | $87.6M | -31.8% | 0.834% | 0.02% |
| 22 | Mirova US LLC | 629K | $86.2M | -4.9% | 0.821% | 0.98% |
| 23 | Liontrust Investment Partners LLP | 574K | $83.1M | 0.0% | 0.749% | 1.23% |
| 24 | JANUS HENDERSON GROUP PLC | 593K | $81.3M | -1.0% | 0.774% | 0.04% |
| 25 | NORTHERN TRUST CORP | 589K | $80.8M | +1.0% | 0.769% | 0.01% |
denotes a marquee investor (Buffett, Burry, ARK, Tiger Global, Pershing Square, Baupost and other widely-followed managers). “% of Fund” shows how much of that investor’s total 13F portfolio is invested in WMS — a direct measure of their conviction.
Filings activity in WMS during Q1 2026, grouped by how each filer changed its position.
8 quarters of 13F filings · Δ columns show change vs prior quarter
| Quarter | Inst. Holders | Δ Holders | Ownership % | Δ Ownership | Total 13F Value | Δ Value |
|---|---|---|---|---|---|---|
| Q1 2026 | 562 | +6.4% | 88.57% | 7.19 pp | $9.15B | 7.5% |
| Q4 2025 | 528 | +9.8% | 95.76% | 95.44 pp | $9.90B | 50% |
| Q3 2025 | 481 | +2.3% | 191.20% | +114.40 pp | $19.76B | +149% |
| Q2 2025 | 470 | +4.4% | 76.80% | +7.69 pp | $7.94B | +11% |
| Q1 2025 | 450 | 1.1% | 69.11% | 2.18 pp | $7.14B | 3.1% |
| Q4 2024 | 455 | 3.4% | 71.29% | 21.05 pp | $7.37B | 23% |
| Q3 2024 | 471 | 3.5% | 92.34% | 0.65 pp | $9.55B | 0.7% |
| Q2 2024 | 488 | — | 92.99% | — | $9.61B | — |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Δ columns compare to the immediately prior filed quarter.
Quick answers to the most common questions about buying WMS stock.
Based on Q1 2026 13F filings, institutional ownership of Advanced Drainage Systems, Inc. stands at 88.6%, held across 562 reporting institutions.
BlackRock, Inc. is the largest reported institutional holder of WMS, with approximately 7,422,729 shares worth $1.02B as of Q1 2026.
No marquee "smart money" managers (Berkshire, Burry, ARK, Tiger Global, Pershing Square, Baupost, etc.) currently appear among the top 25 institutional holders of WMS.
Our composite Smart Money Score for WMS is 34 out of 100 (Bearish). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
103 institutions opened new positions in WMS during Q1 2026, while 69 fully exited. 158 added to existing positions and 297 trimmed.
WMS institutional ownership fell by 7.19 percentage points quarter-over-quarter, with a net change of +34 holders.
The top 10 institutions account for 43.9% of all reported 13F value in WMS, and the top 25 account for 64.2%.
All data is sourced from SEC Form 13F filings, which institutional investment managers with at least $100M in assets are required to file each quarter. We process every 13F filing from EDGAR and recompute the aggregates after each cycle. Insider transactions are sourced from Form 4 filings.
Advanced Drainage Systems, Inc. (WMS) Institutional Ownership