Montauk Renewables, Inc. (MNTK) Ownership
MNTK ownership summary
as of October 18, 2026- Institutions
- 19.1% of shares outstanding
- Insiders
- 70.15% of shares outstanding
- Shares outstanding
- 142.3M
- Float
- 65.8M shares available to trade
- Short interest
- 4.46% 1.9M shares short
- Days to cover
- 2.55 short interest up 29.4% vs prior month
- Institutions 19.10%
- Insiders 70.15%
- Other investors 10.75%
MNTK top institutional holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | BlackRock Inc | 3.31% | 4.7M | $10.1M | +490,896 (+11.6%) | June 30, 2026 |
| 2 | Vanguard Capital Management, LLC | 1.90% | 2.7M | $5.8M | +18,186 (+0.7%) | June 30, 2026 |
| 3 | Geode Capital Management, LLC | 1.32% | 1.9M | $4.0M | +120,014 (+6.8%) | June 30, 2026 |
| 4 | Baader Bank INC | 1.13% | 1.6M | $3.4M | — | June 30, 2026 |
| 5 | State Street Corp | 0.96% | 1.4M | $2.9M | +4,220 (+0.3%) | June 30, 2026 |
| 6 | Barclays PLC | 0.67% | 954K | $2.0M | −85,407 (−8.2%) | June 30, 2026 |
| 7 | American Century Companies Inc | 0.67% | 950K | $2.0M | −4,026 (−0.4%) | June 30, 2026 |
| 8 | Charles Schwab Investment Management Inc | 0.38% | 539K | $1.2M | +18,723 (+3.6%) | June 30, 2026 |
| 9 | Northern Trust Corp | 0.38% | 536K | $1.1M | +30,683 (+6.1%) | June 30, 2026 |
| 10 | Vanguard Portfolio Management, LLC | 0.33% | 469K | $1.0M | +80,134 (+20.6%) | June 30, 2026 |
| 11 | Dimensional Fund Advisors, Inc. | 0.32% | 449K | $960,471 | −287,766 (−39.1%) | June 30, 2026 |
| 12 | Vanguard Fiduciary Trust Co | 0.31% | 439K | $938,983 | +6,509 (+1.5%) | June 30, 2026 |
| 13 | Hosking Partners LLP | 0.27% | 391K | $835,706 | −6,415 (−1.6%) | June 30, 2026 |
| 14 | First Trust Advisors L.P. | 0.27% | 382K | $817,242 | +69,939 (+22.4%) | June 30, 2026 |
| 15 | The Goldman Sachs Group Inc | 0.27% | 377K | $807,373 | +46,088 (+13.9%) | June 30, 2026 |
| 16 | Renaissance Technologies Corp | 0.26% | 365K | $780,672 | +10,200 (+2.9%) | June 30, 2026 |
| 17 | JPMorgan Chase & Co | 0.19% | 271K | $579,901 | +108,730 (+67.0%) | June 30, 2026 |
| 18 | AQR Capital Management LLC | 0.17% | 238K | $509,645 | +199,801 (+521.0%) | June 30, 2026 |
| 19 | GSA Capital Partners LLP | 0.14% | 201K | $430,258 | −88,839 (−30.6%) | June 30, 2026 |
| 20 | JTC Employer Solutions Trustee Ltd | 0.14% | 198K | $423,418 | — | June 30, 2026 |
Value at the latest close. Change = shares bought or sold in the latest quarterly filing (13F). In the top 20, 13 holders added 1.2M shares and 5 cut 472K.
MNTK top mutual fund and ETF holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | Investec FR Dynamic Equity B | 3.64% | 5.2M | $11.1M | +112,101 (+2.2%) | June 30, 2026 |
| 2 | Vanguard MStar Total Stk Mkt Idx Invest | 1.33% | 1.9M | $4.1M | — | August 31, 2026 |
| 3 | iShares Russell 2000 ETF | 1.19% | 1.7M | $3.6M | −19,584 (−1.1%) | September 30, 2026 |
| 4 | Avantis US Small Cap Value ETF | 0.54% | 774K | $1.7M | — | September 30, 2026 |
| 5 | Fidelity Small Cap Index | 0.52% | 744K | $1.6M | −502 (−0.1%) | July 31, 2026 |
| 6 | iShares Russell 2000 Value ETF | 0.34% | 488K | $1.0M | +740 (+0.2%) | September 30, 2026 |
| 7 | Vanguard Russell 2000 ETF | 0.28% | 392K | $839,856 | +7,800 (+2.0%) | August 31, 2026 |
| 8 | Schwab US Small-Cap ETF™ | 0.25% | 359K | $768,831 | +243 (+0.1%) | September 30, 2026 |
| 9 | Fidelity Extended Market Index | 0.24% | 346K | $741,026 | −1,861 (−0.5%) | August 31, 2026 |
| 10 | First Trust NASDAQ® Cln Edge® GrnEngyETF | 0.19% | 267K | $570,943 | — | September 30, 2026 |
| 11 | iShares Micro-Cap ETF | 0.15% | 216K | $462,336 | −1,490 (−0.7%) | September 30, 2026 |
| 12 | Schwab Small Cap Index | 0.12% | 171K | $365,283 | — | August 31, 2026 |
| 13 | Russell Inv US Small Cap Equity Y | 0.10% | 149K | $318,941 | +9,453 (+6.8%) | August 31, 2026 |
| 14 | iShares Russell 2000 Growth ETF | 0.10% | 145K | $310,159 | −183 (−0.1%) | September 30, 2026 |
| 15 | Fidelity Nasdaq Composite ETF | 0.09% | 128K | $274,663 | — | September 30, 2026 |
| 16 | Multimanager Aggressive Equity IA | 0.09% | 127K | $272,015 | — | August 31, 2026 |
| 17 | Fidelity Total Market Index | 0.08% | 120K | $255,905 | +2,433 (+2.1%) | August 31, 2026 |
| 18 | iShares Russell 2000 Small-Cap Idx Instl | 0.08% | 109K | $232,209 | — | August 31, 2026 |
| 19 | Nuveen Small Cap Blend Idx R6 | 0.07% | 106K | $227,486 | — | August 31, 2026 |
| 20 | Fidelity Series Total Market Index | 0.07% | 101K | $216,369 | — | August 31, 2026 |
Funds report holdings monthly or quarterly; dates differ by fund.
MNTK insider transactions
latest 2| Date | Name | Transaction | Price | Shares | Value |
|---|---|---|---|---|---|
| 2022-11-28 | Scott E Hill | Sell | $12.03 | 104,147 | $1.3M |
| 2022-11-28 | Sean F Mcclain | Sell | $12.09 | 60,000 | $725,400 |
Reported trades by company officers, directors and other filers (including disclosures by members of Congress where EODHD lists them). "—" where the filing gives no share count.
MNTK shares outstanding
Year-end shares outstanding, adjusted for splits.
Who owns MNTK
Institutional investors own 19.1% of Montauk Renewables's shares and insiders 70.15%. The largest holder is BlackRock Inc with 3.31% of the shares (4.7M), as of June 30, 2026. Among the top 20 institutions, 13 added shares and 5 reduced their stake in the latest filings. Short interest is 4.46% of the float, or 2.55 days of average trading volume. The share count rose 1.5% since 2019.
Related: MNTK analyst forecast, MNTK key metrics. See the MNTK stock overview for the latest quote and news.
MNTK ownership FAQ
Who owns the most Montauk Renewables stock?
The largest shareholders of Montauk Renewables are BlackRock Inc (3.31%), Vanguard Capital Management, LLC (1.90%), Geode Capital Management, LLC (1.32%), Baader Bank INC (1.13%), State Street Corp (0.96%).
What percentage of Montauk Renewables is owned by institutions?
Institutions hold 19.1% of Montauk Renewables's shares outstanding; insiders hold 70.15%.
Which funds own Montauk Renewables?
The largest fund holders of Montauk Renewables are Investec FR Dynamic Equity B (3.64%), Vanguard MStar Total Stk Mkt Idx Invest (1.33%), iShares Russell 2000 ETF (1.19%), Avantis US Small Cap Value ETF (0.54%), Fidelity Small Cap Index (0.52%).
What is Montauk Renewables's short interest?
1.9M shares of Montauk Renewables were sold short, 4.46% of the float; at the average daily volume it would take 2.55 days to cover.
Are insiders buying or selling Montauk Renewables?
Of the latest 2 reported insider transactions in Montauk Renewables (since November 28, 2022), 0 were purchases and 2 were sales.
How many shares of Montauk Renewables are outstanding?
Montauk Renewables has 142.3M shares outstanding, of which 65.8M are in the public float.