Active

Sideline Group

General contacts

Investor type

PE / VC

Founded

2021

AUM

$155 M

Location

New York, New York, United States

Investment Ticket

$10-50 m

Investment Stage

Pre-seed Seed Series B

Region of investment

North America

Investor profile last updated: 07 May, 2026

Profile

Sideline Group is a New York-based investment firm that focuses on private equity and venture investments, primarily in the offline economy. Founded by Greg Mazlin, the firm partners with brands and operators in consumer goods, sports, media, and entertainment, emphasizing growth-stage businesses that promote healthier lifestyles and community engagement. The team comprises professionals with backgrounds from notable firms like Blackstone and Boston Consulting Group, ensuring a disciplined investment approach.

The firm manages private equity and early-stage venture funds, including its debut Sideline Group Fund I, which closed in 2026 with $155 million in committed capital. Sideline Group targets investments in areas such as performance apparel, fitness concepts, and community-driven events. Its portfolio includes companies like Bandit Running and Urban Golf Performance, reflecting its commitment to active lifestyles and experiential consumption.

Industry

Consumer Products Consumer Services (B2C) Marketing and Advertising Media and Entertainment Sports/SportsTech Technology

Sideline Group Funds

Name	Type	Industry	Stage	Region	Size	AUM	Launch date
Sideline Group Fund I	Venture Capital (VC)	Consumer Products Consumer Services (B2C) Marketing and Advertising Media and Entertainment Sports/SportsTech Technology	Pre-seed Seed	North America	$5-10 m	$155 M	April 2026

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Investment-team contacts for Sideline Group — including verified work emails and LinkedIn profiles — are available to Private Equity List subscribers.
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Contacts sourced from the firm's website and LinkedIn, re-verified on a rolling cycle. Spot a stale contact, or none at all? Report it — we re-run that firm within 48h and get back to you.

FAQs about Sideline Group

Is Sideline Group a venture capital or private equity firm?

Sideline Group is a venture capital and private equity firm. It backs companies at Pre-seed, Seed and Series B, writing tickets of $10-50 m.

Where is Sideline Group located?

Sideline Group is located in New York, New York, United States.

When was Sideline Group founded?

Sideline Group was founded in 2021.

What sectors and industries does Sideline Group invest in?

Sideline Group invests in companies and startups in Consumer Products, Consumer Services (B2C), Marketing and Advertising, Media and Entertainment, Sports/SportsTech, Technology.

What is Sideline Group geographical focus of investments?

Sideline Group invests in companies and startups in North America.

At what stages of companies and startups does Sideline Group typically invest in?

Sideline Group invests in companies and startups at Pre-seed, Seed, Series B.

What is the usual amount of Sideline Group investment?

Sideline Group usually invests $10-50 m on average.

What is the amount of assets of under management (AUM) for Sideline Group?

Sideline Group has around $155m assets under management.

When was Sideline Group last fund created?

Sideline Group last fund was created/launched in 2026-04-17

What are the contacts of Sideline Group?

Sideline Group can be reached through its website sidelinegroup.co and its LinkedIn page. Its general enquiries address is info@sidelinegroup.co. Cold-mailing a general inbox rarely reaches a partner, so Private Equity List also lists the investment-team contacts for Sideline Group — names, roles, verified work emails and LinkedIn profiles — available on a Pro plan from $129/month (see pricing). Contacts are sourced from the firm's website and LinkedIn and re-verified on a rolling cycle. Spot a stale contact, or none at all? Report it — we re-run that firm within 48h and get back to you.

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Yes. Every field on this page — profile, funds, investment criteria, portfolio and investment-team contacts — is available programmatically through the Private Equity List REST API and MCP server, so AI assistants such as Claude and ChatGPT can query Sideline Group directly instead of scraping this page. One subscription covers both the web app and machine access — see API & MCP.

When was the Sideline Group profile last updated?

Private Equity List re-verifies investor profiles on a rolling cycle, pulling from the firm's own website and LinkedIn rather than a one-off import. This profile was last updated on 07 May, 2026. Something out of date here? Report it — we re-run that firm within 48h and get back to you.