MCHXMARCHEX INC

CL B · CUSIP 56624R108

Smart Money Ownership

Of the 5 tracked institutions holding MCHX, 2 have a 3-year clone track record — 2 of them beat the S&P. Average holder's clone alpha: +6.5pt. It's a gauge of who owns the name, not just how many.

Jim Simons

Alpha = the manager's 3-year clone return minus the S&P 500. A skilled roster is a stronger tell than a crowded one — though even skilled managers' edge doesn't reliably survive the 13F disclosure lag. Why →

MCHX (MARCHEX INC) Institutional Ownership Summary

Among the 5 tracked institutional investors we monitor, MCHX (MARCHEX INC) is held with a combined value of $6.00M across 3,685,496 shares. The largest holder is RENAISSANCE TECHNOLOGIES LLC with a position worth $2.54M. 2 funds increased their holdings. 1 fund reduced its position.

Total Institutional Value

$6.00M

Total Shares Held

3,685,496

Institutional Holders

This Quarter's Biggest Movers

Ranked by estimated dollars moved (share change × implied price). 13F data lags up to 45 days.

Biggest Buyers

BlackRock, Inc.+3% shares~$25.8K CITADEL ADVISORS LLC+4% shares~$1.2K

Biggest Sellers

RENAISSANCE TECHNOLOGIES LLC−2% shares~$46.5K

13F Institutional Holders

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RENAISSANCE TECHNOLOGIES LLC

#	Fund	Value↓	Shares	Portfolio %	Change
1	RENAISSANCE TECHNOLOGIES LLC	$2.54M	1,576,464	0.00%	-1.8%
2	VANGUARD GROUP INC	$2.15M	1,294,755	0.00%	-
3	BlackRock, Inc.	$1.06M	656,221	0.00%	+2.5%
4	STATE STREET CORP	$226.52K	140,696	0.00%	-
5	CITADEL ADVISORS LLC	$27.95K	17,360	0.00%	+4.4%

Activist & Large Holders (13D/13G)

Investor	Ownership	Type	Filed
HOROWITZ RUSSELL C	18.5%	13D	2026-07-07

SEC Schedule 13D (activist) and 13G (passive) filings for MCHX. Filed when an investor acquires 5%+ ownership.

Frequently Asked Questions

Which institutional investors own the most MCHX stock?

As of the latest SEC 13F filings, RENAISSANCE TECHNOLOGIES LLC is the largest institutional holder of MCHX with a position worth $2.54M, representing 0.00% of their portfolio. In total, 5 institutional investors hold MCHX with a combined value of $6.00M.

What percentage of MCHX is owned by institutional investors?

Institutional investors hold $6.00M worth of MCHX stock across 5 positions. The largest institutional holder is RENAISSANCE TECHNOLOGIES LLC with $2.54M in holdings.

What is a 13F filing and why does it matter for MCHX?

A 13F filing is a quarterly report required by the SEC from institutional investment managers with over $100 million in assets. It discloses their holdings in U.S. equities. For MCHX, these filings reveal which major funds are accumulating or reducing positions, providing insights into institutional sentiment.

Track MCHX institutional moves

Get notified when hedge funds change their MCHX positions.