Ranked by reported Q1 2026 13F market value
Share of total reported institutional value in MNTK held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | BlackRock, Inc. | 4.2M | $4.9M | -2.4% | 2.964% | 0.00% |
| 2 | VANGUARD CAPITAL MANAGEMENT LLC | 2.7M | $3.1M | — | 1.889% | 0.00% |
| 3 | GEODE CAPITAL MANAGEMENT, LLC | 1.8M | $2.0M | +2.0% | 1.236% | 0.00% |
| 4 | Baader Bank Aktiengesellschaft | 1.6M | $1.8M | 0.0% | 1.128% | 0.15% |
| 5 | STATE STREET CORP | 1.4M | $1.6M | -1.5% | 0.959% | 0.00% |
| 6 | BARCLAYS PLC | 1.0M | $1.2M | +849.9% | 0.730% | 0.00% |
| 7 | AMERICAN CENTURY COMPANIES INC | 954K | $1.1M | -0.1% | 0.670% | 0.00% |
| 8 | DIMENSIONAL FUND ADVISORS LP | 737K | $847K | -11.5% | 0.517% | 0.00% |
| 9 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 521K | $599K | -4.4% | 0.366% | 0.00% |
| 10 | NORTHERN TRUST CORP | 505K | $581K | +8.5% | 0.355% | 0.00% |
| 11 | VANGUARD FIDUCIARY TRUST CO | 432K | $497K | — | 0.304% | 0.00% |
| 12 | Hosking Partners LLP | 397K | $456K | +0.2% | 0.279% | 0.02% |
| 13 | VANGUARD PORTFOLIO MANAGEMENT LLC | 389K | $447K | — | 0.273% | 0.00% |
| 14 | RENAISSANCE TECHNOLOGIES LLC | 355K | $408K | +3.5% | 0.249% | 0.00% |
| 15 | GOLDMAN SACHS GROUP INC | 331K | $381K | +69.0% | 0.233% | 0.00% |
| 16 | FIRST TRUST ADVISORS LP | 312K | $359K | -7.8% | 0.219% | 0.00% |
| 17 | MORGAN STANLEY | 261K | $301K | -20.5% | 0.184% | 0.00% |
| 18 | MILLENNIUM MANAGEMENT LLC | 207K | $238K | +706.4% | 0.145% | 0.00% |
| 19 | MARSHALL WACE, LLP | 205K | $235K | — | 0.144% | 0.00% |
| 20 | Bank of New York Mellon Corp | 196K | $225K | -6.5% | 0.138% | 0.00% |
| 21 | ALLIANCEBERNSTEIN L.P. | 98K | $163K | 0.0% | 0.068% | 0.00% |
| 22 | Nuveen, LLC | 140K | $161K | +0.6% | 0.098% | 0.00% |
| 23 | D. E. Shaw & Co., Inc. | 118K | $136K | -38.5% | 0.083% | 0.00% |
| 24 | Rathbone Brothers plc | 102K | $117K | +10.9% | 0.072% | 0.00% |
| 25 | RHUMBLINE ADVISERS | 93K | $107K | -3.8% | 0.065% | 0.00% |
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 MNTK — a direct measure of their conviction.
Filings activity in MNTK 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 | 90 | +11% | 9.74% | 3.90 pp | $23M | 29% |
| Q4 2025 | 81 | 9.0% | 13.64% | 3.50 pp | $32M | 20% |
| Q3 2025 | 89 | +2.3% | 17.14% | 1.67 pp | $41M | 8.9% |
| Q2 2025 | 87 | 5.4% | 18.81% | +0.26 pp | $44M | +1.4% |
| Q1 2025 | 92 | 2.1% | 18.55% | 17.74 pp | $44M | 49% |
| Q4 2024 | 94 | +0.0% | 36.29% | 10.96 pp | $86M | 23% |
| Q3 2024 | 94 | 15% | 47.25% | 5.87 pp | $112M | 11% |
| Q2 2024 | 110 | — | 53.12% | — | $126M | — |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Δ columns compare to the immediately prior filed quarter.
Latest Form 4 transactions by company officers and directors. Insider buys are widely viewed as the highest-conviction signal because executives are risking personal capital.
| Date | Insider | Action | Shares | Price | Value |
|---|---|---|---|---|---|
| May 11, 2026 | Copelyn John A | Buy | 18K | $1.45 | $25K |
Quick answers to the most common questions about buying MNTK stock.
Based on Q1 2026 13F filings, institutional ownership of Montauk Renewables, Inc. stands at 9.7%, held across 90 reporting institutions.
BlackRock, Inc. is the largest reported institutional holder of MNTK, with approximately 4,218,997 shares worth $0.00B as of Q1 2026.
Yes — 2 widely-followed marquee investors appear among the top 25 institutional holders of MNTK, including RENAISSANCE TECHNOLOGIES LLC, MILLENNIUM MANAGEMENT LLC.
Our composite Smart Money Score for MNTK is 49 out of 100 (Neutral). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
20 institutions opened new positions in MNTK during Q1 2026, while 11 fully exited. 12 added to existing positions and 55 trimmed.
MNTK institutional ownership fell by 3.90 percentage points quarter-over-quarter, with a net change of +9 holders.
The top 10 institutions account for 76.9% of all reported 13F value in MNTK, and the top 25 account for 95.3%.
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.
Montauk Renewables, Inc. (MNTK) Institutional Ownership