Montauk Renewables
Turns landfill and farm waste into renewable natural gas, electricity, and environmental credits.
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Breakdown13F · Form 4
Shares outstanding 142.34M · Float 41.68M · 29.3% free float
A Form 4 total here can count shares the filer formally disclaims — an award voted by proxy, for instance — which the holder's own Schedule 13D/G excludes, so where the two disagree the schedule's smaller figure is used.
Institutions13F, as of Mar 31, 2026
93 holders · 20.81M shares · 21 new positions · 49 increased · 30 reduced · 9 closed
| Holder | Shares | % outstanding | Chg q/q | Filed |
|---|---|---|---|---|
| BlackRock, Inc. | 4.22M | 2.96% | −105.3K | May 13, 2026 |
| Vanguard Capital Management LLC | 2.69M | 1.89% | +2.69Mnew | May 15, 2026 |
| Geode Capital Management, LLC | 1.76M | 1.24% | +34.3K | May 15, 2026 |
| Baader Bank Aktiengesellschaft | 1.61M | 1.13% | 0 | May 8, 2026 |
| State Street Corp | 1.37M | 0.96% | −20.5K | May 15, 2026 |
| Barclays PLC | 1.04M | 0.73% | +929.5K | May 15, 2026 |
| American Century Companies Inc | 954.5K | 0.67% | −643 | May 15, 2026 |
| Dimensional Fund Advisors LP | 736.6K | 0.52% | −96.0K | May 7, 2026 |
Beneficial owners13D/G · 5% or more, as filed
| Holder | % of class | Shares | Form | Filed |
|---|---|---|---|---|
| Aktiv Investment Management (Pty) Ltd | 15.70% | 22.30M | 13D | Nov 10, 2025 ↗ |
InsidersForm 4
| Insider | Role | Shares | % outstanding | Filed |
|---|---|---|---|---|
| Aktiv Investment Management (Pty) Ltd | 10 percent owner | 22.30M | 15.66% | Nov 10, 2025 |
| Sean F. McClain | director, officer: President & CEO | 1.14M | 0.80% | May 22, 2026 |
| Kevin A. van Asdalan | officer: Chief Financial Officer | 497.5K | 0.35% | May 22, 2026 |
| James A. Shaw | officer: Chief Operating Officer | 477.4K | 0.34% | May 22, 2026 |
| John Ciroli | officer: Chief Legal Officer | 470.8K | 0.33% | May 22, 2026 |
| Sharon R. Frank | officer: VP Environ Health & Safety | 39.3K | 0.03% | Nov 26, 2025 |
| John A. Copelyn | director | 17.5K | 0.01% | May 13, 2026 |
2 ten-percent owners hold 24.64M shares by Form 4 — the 13D/G table above shows those stakes, the figure above counts officers and directors only · 4 people have not refiled in the last 18 months (18.74M shares), so they are not in the figure above
Latest trades
| Date | Insider | Type | Shares | Avg price | Owned after |
|---|---|---|---|---|---|
| May 11, 2026 | John A. Copelyndirector | Purchase | 17,506 | $1.45 | 17,506 |
CongressHouse and Senate disclosures
Not reported.