Montauk Renewables, Inc.
Montauk Renewables, Inc. (MNTK) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · MNTK · as of Mar 31, 2025
Ownership Breakdown
91
Institutional Holders
▼ 1 vs Q4
$44.88M
Total Inst. Value
▼ $42.76M vs Q4
142.34M
Shares Outstanding
freeFloat 29.28%
21.47M
13F Shares Held
▼ 543,288 vs Q4
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
MNTK largest shareholders · institutional ownership
Q1 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
BLACKROCK, INC. gas & other services combined | 4.55M | 3.19% | 3.19% | $9.51B | May 2, 2025 | ▼ 217.8K |
VANGUARD GROUP INC gas & other services combined | 3.84M | 2.69% | 2.69% | $8.02B | May 9, 2025 | ▲ 52.6K |
GEODE CAPITAL MANAGEMENT, LLC gas & other services combined | 1.68M | 1.18% | 1.18% | $3.51B | May 13, 2025 | ▲ 32.0K |
BAADER BANK AKTIENGESELLSCHAFT gas & other services combined | 1.60M | 1.12% | 1.12% | $3.35B | May 8, 2025 | — held |
STATE STREET CORP gas & other services combined | 1.45M | 1.02% | 1.02% | $3.04B | May 15, 2025 | ▼ 114.6K |
AMERICAN CENTURY COMPANIES INC gas & other services combined | 1.03M | 71.89% | 71.89% | $2.14B | May 13, 2025 | ▲ 33.9K |
DIMENSIONAL FUND ADVISORS LP gas & other services combined | 948.2K | 66.44% | 66.44% | $1.98B | May 13, 2025 | ▲ 96.9K |
HOSKING PARTNERS LLP gas & other services combined | 761.3K | 53.35% | 53.35% | $1.59B | May 12, 2025 | ▼ 7.8K |
NORTHERN TRUST CORP gas & other services combined | 580.3K | 40.66% | 40.66% | $1.21B | May 13, 2025 | ▼ 38.3K |
CHARLES SCHWAB INVESTMENT MANAGEMENT INC gas & other services combined | 508.7K | 35.64% | 35.64% | $1.06B | Sep 15, 2025 | ▲ 12.2K |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q1 2025 vs prior quarter
Q1 2025
22
Increased
+749.2K shares4
New Positions
first time holders18
Decreased
−1.21M shares0
Sold Out
fully exitedNet shares change (top 50)
459.7K
+749.2K / −1.21M
Net new holders
+8
4 new / 0 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
MNTK insider trading · insider activity
Source: SEC Form 4
Insiders have been net buyers of shares recently. Selling may be driven by pre-scheduled Rule 10b5-1 plans rather than negative sentiment.
5
Buy transactions
0
Sell transactions
0.00
Buy/Sell ratio
$0M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
| Name · Role | Date | Type | Shares | Price | Value | After Trans. | Filing |
|---|---|---|---|---|---|---|---|
Shaw James A Chief Operating Officer | May 20, 2026 | Award | 282,842 | — | — | 477.4K | Form 4 ↗ |
McClain Sean F President & CEO | May 20, 2026 | Award | 383,183 | — | — | 1.14M | Form 4 ↗ |
Van Asdalan Kevin A Chief Financial Officer | May 20, 2026 | Award | 302,982 | — | — | 497.5K | Form 4 ↗ |
Ciroli John Chief Legal Officer | May 20, 2026 | Award | 302,982 | — | — | 470.8K | Form 4 ↗ |
Copelyn John A director | May 11, 2026 | Purchase | 17,506 | $1.45 | $25.4K | 17.5K | Form 4 ↗ |
Frank Sharon R VP Environ Health & Safety | Nov 24, 2025 | Tax Withhold | 2,748 | $1.67 | $4.6K | 39.3K | Form 4 ↗ |
Frank Sharon R VP Environ Health & Safety | Nov 24, 2024 | Tax Withhold | 2,748 | $4.46 | $12.3K | 42.0K | Form 4 ↗ |
Frank Sharon R VP Environ. Health & Safety | Nov 24, 2023 | Tax Withhold | 2,658 | $9.09 | $24.2K | 44.8K | Form 4 ↗ |
Barsch Michael See Remarks | Sep 15, 2023 | Award | 75,000 | $9.57 | $717.8K | 75.0K | Form 4 ↗ |
Van Asdalan Kevin A CFO and Treasurer | Apr 19, 2023 | Award | 166,667 | $6.77 | $1.13M | 166.7K | Form 4 ↗ |
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
Montauk Renewables, Inc. (MNTK) is primarily owned by institutional investors, who hold approximately 15.1% of total shares outstanding. Company insiders own approximately 70.72%, while retail and public investors account for the remaining 14.20%.
The largest institutional shareholder of Montauk Renewables, Inc. is BLACKROCK, INC., holding approximately 4.55 million shares — equal to 3.19% of outstanding shares — as of March 31, 2025.
A total of 91 institutional investors currently hold MNTK stock, with a combined institutional value of approximately $44,880,335 as of the most recent 13F filing period.
Frequently asked questions
MNTK ownershipMontauk Renewables, Inc. (MNTK) is primarily owned by institutional investors, who hold approximately 15.1% of shares. The largest shareholder is BLACKROCK, INC. with a 3.19% stake. Company insiders hold 70.72%. Data sourced from SEC Form 13F as of March 31, 2025.