What Harmonai does

Harmonai is a San Francisco-based, privately-held quantitative research advisor that conducts artificial intelligence research to generate systematic trading signals for its own proprietary trading activities. The firm is built around a team of quant researchers and AI developers, with stated capabilities spanning high-frequency trading infrastructure (nanosecond-latency custom hardware and order-book models), machine learning, and quantitative risk management priors applied to medium-to-high frequency trading. The founder, Oz Sozen, is a classically-trained quant whose prior work includes co-founding LaSalle Trading Group (an HFT firm started with partners from Hehmeyer Trading and Jump Trading) and deploying industry-wide behavioral AI used by the Federal Reserve and major banks to manage $10T of mortgage market risk post-2008, as well as predictive ML for energy derivatives hedging post-Enron.

The firm's stated technology stack is centered on quantitative predictive models that produce trading signals without a discretionary thesis, allowing it to trade in any direction found quantitatively optimal under any market regime. The system explicitly avoids reliance on fixed fundamental views, cultural or capital privilege, and discretionary judgment; instead it adheres to mathematical methods applied to structured market and time-series financial data. Harmonai does not maintain a traditional product surface — there are no external customers, no API, no SDK, and no mobile or desktop application. The single stated offering is internal quantitative research advisory work that feeds the firm's own proprietary book.

Commercially, Harmonai operates as a closed proprietary trading group. It explicitly does not offer services to the general public, does not manage external capital, does not accept investor capital, and does not actively seek new capital investment. Revenue, to the extent it exists, is derived entirely from internal trading P&L (the firm's revenue model is recorded as transaction-based proprietary trading income). Distribution is purely internal: all trading is conducted on the firm's own behalf, with no disclosed external distribution channels, no pricing model, and no customer logos. The company's public footprint is limited to a website, a contact form, and founder social-media accounts on X and Instagram.

Name

Harmonai

Legal name

Harmonai

Website

https://harmon.ai

Company type

Private

Operating status

Operating

Short description

Harmonai is a San Francisco-based quantitative research advisor that uses AI-driven predictive models for systematic proprietary trading in open markets, without managing external capital or serving outside customers.

Ownership category

akta.pro rank

Product category

Algorithmic Trading Services

NAICS

Miscellaneous Financial Investment Activities (523999), Miscellaneous Intermediation (52391)

SIC

Commodity Contracts Brokers & Dealers (6221), Security & Commodity Brokers, Dealers, Exchanges & Services (6200), Investment Advice (6282)

akta.pro primary industry

Market Making & Liquidity Provision (FSADAJAC)

Keywords

• Algorithmic trading
• Quantitative research
• AI trading models
• High-frequency trading
• Proprietary trading

Headquarters

HQ city

San Francisco

HQ country

United States

HQ region

North America

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Technology or R&D, Operations

Revenue model

1. Proprietary Trading Revenue: Harmonai operates as a proprietary trading group generating revenue through its own quantitative trading activities using AI-driven predictive models in financial markets. The company does not manage external capital or accept external investors.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels3 records

Core offering

Harmonai is a quantitative research advisor that uses artificial intelligence and machine learning to generate trading signals for proprietary trading in open free markets. The firm builds predictive models that operate strictly systematically without a discretionary thesis, trading in any direction found to be quantitatively optimal. The company does not offer services to the general public, does not manage external capital, and does not actively seek new capital investment.

Product overview

Harmonai operates as a single-service quantitative research advisory firm. The company does not offer services to the general public, investors, or manage external capital. All offerings center on proprietary quantitative research using AI and machine learning to generate trading signals for their own trading operations. The sole product is their quantitative research advisory service focused on systematic, mathematically-driven trading signal generation using predictive models.

Differentiator

Problem solved

Functional benefit

Products and services

• Quantitative Research Advisory Services

Quantifiable outcome

• Ultra-high Sharpe ratio with less than 0.02% drawdown achieved at LaSalle Trading Group

Segments1 record

Ideal customer profiles1 record

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

AI capability2 records

Feature3 records

Scale indicators1 record

Recent moves4 records

Expansion highlights3 records

Direct peers

• XTX Markets: AI-driven liquidity provider using ML across equities, FX, commodities, and crypto. Closest comparable in terms of explicit AI-first architecture applied to liquidity provision.
• Jump Trading: Chicago-based HFT and quantitative trading firm. The founder co-founded LaSalle with partners from Jump, making it a direct cultural and operational peer in nanosecond-latency systematic trading.
• Hudson River Trading: Quantitative trading firm using ML and statistical strategies across global markets. Directly comparable in systematic, ML-driven signal generation and custom infrastructure.
• Tower Research Capital: Electronic trading firm specializing in HFT and quantitative strategies with custom low-latency infrastructure. Peer in FPGA/custom-hardware-driven systematic trading.
• DRW Trading: Proprietary trading firm active across multiple asset classes including crypto. Comparable as a multi-strategy prop firm with proprietary capital and technology focus.
• Akuna Capital: Tech-driven options and electronic trading firm using ML. Comparable as a smaller, talent-dense quant/HFT firm with similar team structure.

Broad incumbents

• Citadel Securities: Global market maker and HFT firm operating across multiple asset classes. Comparable as a high-performance, technology-driven proprietary trading operation competing for liquidity and execution quality in the same venues Harmonai targets.
• Two Sigma: Large quantitative hedge fund applying ML and distributed computing to trading. Comparable in ML-driven alpha generation, though at vastly greater scale and with external capital.
• Renaissance Technologies: Iconic quant fund using mathematical and statistical methods to generate returns. Comparable in purely quantitative, model-driven philosophy, though at unmatched scale and secrecy.

Emerging players

• Wintermute: Crypto-native algorithmic trading firm and liquidity provider. Comparable as a tech-driven systematic liquidity provider in digital asset markets, aligning with the founder's thesis on crypto market expansion.

Market position

Strengths4 records

Weaknesses5 records

Competitive moat3 records

Key risks6 records

Key highlights5 records

Customer concentration

• Xx.com/sozenoz
• Instagraminstagram.com/ozsozen

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Harmonai