$MNTK

$2.25 +$0.01 (0.45%) Close

$MNTK Overview Financial Statements SEC Filings Executives News Red Flags Capital Raising Ownership Insider Transactions Congressional Trades

Ownership

13F as of Q2 2026 · 142.3M shares outstanding

Who owns MNTK?

By type of holder

Institutions 15.0% Insiders 17.5% Everyone else 67.5%

Concentration Top 10 holders own 26.7%

Aktiv Investment Management (Pty) Ltd 15.7% · BlackRock, Inc. 3.3%

Institutional ownership

15.0%

+0.4 pts vs last qtr

Institutional holders

-4 vs last qtr

Net shares bought

+571.9K

by institutions in Q2 2026

New / sold out

12 / 16

positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026

BlackRock, Inc. +490.9K
Aqr Capital Management LLC +199.8K

Biggest sellers in Q2 2026

Dimensional Fund Advisors LP −287.8K
Millennium Management LLC −163.4K

Who is planning to sell?

No insider has filed a notice of proposed sale (Form 144) for Montauk Renewables, Inc in the last 12 months.

Is your stake being diluted?

Diluted share count, FY2021–FY2025

+1.5%

+0.36% a year

Each share's claim on the business

−1.4%

shrank without buying or selling a share

Spent on buybacks vs paid in stock

— vs $55M

over 5 fiscal years

Diluted shares, split-adjusted

Buybacks Stock-based comp

How patient are the owners?

Institutional shares by how long they've been held

5+ years13% 3–5 years79% 1–3 years4% Under 1 year3%

Quarterly turnover

7.1%

of institutional shares changed hands

Top 10 managers, median time held

4.8 years

Super Investors

Investment managers reporting MNTK on Form 13F

Holder	Shares	% of company	Change vs last qtr	Held since	% of their book
B BlackRock, Inc.	4.7M	3.31%	+490.9K (+11.6%)	2021	0.0%
Shares held by quarter Peak holding4.8M (Q4'24) Change over 8 quarters+30.6K Share of the company3.310% BlackRock, Inc.'s full portfolio →
VC Vanguard Capital Management LLC	2.7M	1.90%	+18.2K (+0.7%)	2021	0.0%
Shares held by quarter Peak holding2.7M (Q2'26) Change over 8 quarters+2.7M Share of the company1.900% Vanguard Capital Management LLC's full portfolio →

BlackRock, Inc.

4.7M

% of company

3.31%

Change vs last qtr

+490.9K (+11.6%)

Held since

2021

Vanguard Capital Management LLC

2.7M

% of company

1.90%

Change vs last qtr

+18.2K (+0.7%)

Held since

2021

28 more super investors behind a free account

See every manager holding Montauk Renewables, Inc, how their position has changed, and how long they've held it.

Institutional Funds

Mutual funds and ETFs reporting MNTK on Form N-PORT; together they hold 7.4% of the company

Fund	Position value	Shares	% of company	% of the fund	As of
VT Vanguard Total Stock Market Index Fund Vanguard Index Funds	$2.96M	1.9M	1.33%	0.00%	June 30, 2026
IR iShares Russell 2000 ETF iShares Trust	$2.64M	1.7M	1.19%	0.00%	June 30, 2026

Vanguard Total Stock Market Index Fund

Vanguard Index Funds

Position value

$2.96M

% of company

1.33%

% of the fund

0.00%

As of

June 30, 2026

iShares Russell 2000 ETF

iShares Trust

Position value

$2.64M

% of company

1.19%

% of the fund

0.00%

As of

June 30, 2026

23 more funds behind a free account

See every fund holding Montauk Renewables, Inc and how much of the fund the position is.

Insiders and 5%+ holders

From Forms 3/4/5 and Schedules 13D/G

Holder	Shares	% of company	Change vs last qtr	8 quarters	Held since	% of their book
AI Aktiv Investment Management (Pty) Ltd 5%+ holder 13D · 15.7%	22.3M	15.66%	—	—	—	—
This holder reports through Schedule 13D/G, not a quarterly 13F. Share of the company15.660% Disclosed stake13D · 15.7% View the 13D/G filing →
MS McClain Sean F Insider	1.1M	0.80%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company0.800% McClain Sean F's insider activity →

Aktiv Investment Management (Pty) Ltd

5%+ holder13D · 15.7%

22.3M

% of company

15.66%

Change vs last qtr

—

Held since

—

McClain Sean F

Insider

1.1M

% of company

0.80%

Change vs last qtr

—

Held since

—

5 more holders behind a free account

See every insider and 5%+ holder of Montauk Renewables, Inc.

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