SIDELINE GROUP

Exempt Reporting AdvisorFINRA MemberEst. 2025
Total AUM
Accounts
0
Advisory reps
1
Brokerage reps
0
Avg account
$0

Firm details

Headquarters
New York, New York
CRD number
337813
Registered since
July 8, 2025

Firm profile

FINTRX

Overview

Sideline Group is organized as a limited liability company and is registered with the SEC as of 2025. The firm operates primarily as a sponsor, general partner and managing member of pooled investment vehicles rather than as a traditional retail advisory practice. Its owner structure is listed as individual and its regulatory classification is unclassified. Sideline Group is not identified as an active ESG investor, is not a multi-state adviser, and does not list pension consulting or related-adviser roles. Investment activity centers on private fund formation and GP-led portfolio management, with a clear emphasis on venture capital strategies. The firm appears to allocate capital by creating and managing pooled vehicles where it serves in governance and sponsor roles, taking on active oversight and control functions typical of a GP. Public fee structure, client-facing advisory offerings and direct retail account activity are not reported.

Assets & Accounts

Investments & Alternatives

Location & Offices

Investment profile

FINTRX

Traditional investments used

Alternative investments used

Active ESG investor

Technology & operations

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CRM & tech providers

TAMPs used

Clients

FINTRX

Client base

Client personas

Contacts

1 of 1
  • Gregory Mazlin

    FounderCRD 8130215

Wealth teams

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Newly hired reps

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Recent M&A activity

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Recent filings

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Awards

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Location

Primary office

New York, NY

NEW YORK

Location

New York, NY

Headquartered in New York, NY, anchoring the New York-Newark, NY-NJ-CT-PA metro in the Northeast.

Metro area
New York-Newark, NY-NJ-CT-PA
Region
Northeast
County
NEW YORK
Address
405 W 13th St
Time zone
ET (UTC-5)
Office locations

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Source: FINTRX private wealth data intelligence

Intelligence for Private Wealth