Four One Holdings Co.

What Four One Holdings Co. does

Four One Holdings Co. (株式会社フォーワン・ホールディングス) is a privately held Japanese holding company founded on June 27, 2025 by former KPMG DX tax specialist Kotaro Shirai. The firm operates on an explicit "executives = humans, employees = AI" organizational structure, with six human executive officers (drawing on Big4 backgrounds at KPMG, EY, and Justice) working alongside six named AI employees — Shannon, Dean, Second, Modisa, Tsumugi, and Medaka — deployed inside Slack/Teams/Google Chat via the OpenClaw agent platform. It offers six service lines spanning revenue-share development, AI employee placement (OpenClaw), AI advisory, Claude/OpenClaw training, AI × creative production (including the BUCHIAGE AItuber brand), and tax & accounting through its wholly-owned subsidiary Forone Tax Office.

The underlying technology combines OpenClaw-based autonomous agents with a memory and rule-codification layer, Claude Code for development work, freee cloud accounting for tax operations, and generative AI across text, image, video, audio, and code modalities. Notable proprietary components include the FOX AI Tax Agent (instant tax Q&A with handoff to human CPAs) and BUCHIAGE's character memory architecture with zero-shot voice cloning. Security is enforced via approval requirements for external sending, deletion, and permission changes.

The commercial model is a mix of revenue-share (multi-year, tied to client sales growth), monthly subscriptions (AI advisory, AI employee placement, tax & accounting), and professional-services fees (training, creative production). The go-to-market is consultation-led with a free 30-minute initial discussion, no self-serve option, and a horizontal target of Japanese SMB owners, management teams pursuing DX, and founders seeking outcome-aligned development partners. The company's operating geography is the Tokyo Metropolitan Area with no global footprint disclosed.

Name

Four One Holdings Co.

Legal name

株式会社フォーワン・ホールディングス

Website

https://forone-ai.com

Company type

Private

Founded year

2025

Operating status

Operating

Headcount range

1–10 employees

Short description

Japanese AI-native holding company founded June 2025, offering integrated tax, development, AI organization building, and creative services under a revenue-share model, run by six Big4 alumni executives alongside six named AI employees deployed via OpenClaw inside client Slack and Teams workspaces.

Ownership category

akta.pro rank

Product category

AI Consulting and Business Services

NAICS

Corporate, Subsidiary, and Regional Managing Offices (551114), Employment Placement Agencies (561311), All Other Support Services (561990)

SIC

Services-Management Consulting Services (8742), Services-Employment Agencies (7361)

akta.pro primary industry

End-to-End Enterprise AI Platforms (MLOps & Model Lifecycle Management) (HDAEANAA)

akta.pro secondary industries

Responsible AI, AI Governance & Compliance Services (BPAEAHAJ), Responsible AI, Security & Privacy Platforms (Safety, Guardrails, PII) (HDAEANAG), Responsible AI Policy, Controls & Workflow Management (HDAAAMAG)

Keywords

• AI consulting services
• Revenue share development
• AI agent deployment
• Tax accounting services
• AI native organization

Headquarters

HQ city

Sumida

HQ country

Japan

HQ region

Asia

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Technology or R&D, Marketing or Sales

Revenue model

1. Revenue Share Development: Minimal initial development costs; revenue recovered through revenue-share tied to client sales growth. Covers development, SNS operations, marketing, and continuous improvement. This is the primary revenue model that aligns incentives between company and client.
2. AI Employee Placement (OpenClaw): AI agent deployment into client's Slack/Teams environment. Design, placement, training, and ongoing operational support. Client pays for AI team design and ongoing management support.
3. AI Advisory: Monthly subscription model. AI utilization strategy development, monthly strategy meetings (in-person or online), ongoing chat consultation, and implementation prioritization. Supports DX transformation beyond just tool deployment.
4. Claude / OpenClaw Training: AI direction training and executive seminars. Teaches environment design and thinking frameworks for maximizing AI performance, not just prompt writing. Includes organizational定着 programs.
5. AI × Creative: AI creative production including AItuber production, video/music/manga generation, LP/web production. Full-service creative from planning through execution and operations.
6. Tax & Accounting Services: Traditional tax and accounting services including bookkeeping, filing, tax savings strategies, and management consulting. AI employees (Dean, Medaka) handle processing in parallel while human CPAs focus on client dialogue. Leverages freee cloud accounting.

Pricing tiers

Go-to-market motion1 record

Distribution channels3 records

Marketing channels6 records

Core offering

Four One Holdings Co. operates as an AI-native holdings company delivering six integrated service lines: revenue-share based B2B development, OpenClaw-powered AI employee placement into client Slack/Teams environments, monthly AI advisory, AI direction training, AI-driven creative production (including AItuber BUCHIAGE), and tax & accounting services through its wholly-owned Forone Tax Office subsidiary. The company runs on a distinctive "executives = humans, employees = AI" organizational model with six human executives (all Big4 alumni) directing six named AI employees (Shannon, Dean, Second, Modisa, Tsumugi, Medaka).

Product overview

Four One Holdings Co. operates as an AI-native holdings company offering six integrated service lines: Revenue Share Development, AI Employee Placement (OpenClaw), AI Advisory, Claude/OpenClaw Training, AI×Creative, and Tax & Accounting. The core differentiator is that the company runs on an 'executives = humans, employees = AI' organizational structure, with 6 human executives and 6 named AI employees (Shannon, Dean, Second, Modisa, Tsumugi, Medaka) working in parallel. Key products include the OpenClaw AI agent platform for deploying AI teammates in chat environments, the self-developed FOX AI Tax Agent, and the BUCHIAGE AItuber production brand. The company uses a revenue-share business model aligned with client success, and was founded in June 2025 by Big4 alumni including former KPMG DX managers.

Differentiator

Problem solved

Functional benefit

Brands

• FOX: AI Tax Agent - a revenue-share development project providing AI-powered instant responses to tax and accounting questions with seamless handoff to human tax accountants.
• BUCHIAGE

Products and services

• Revenue Share Development Revenue-share based development service where upfront development costs are minimized and compensation is tied to client sales growth. Covers B2B development, SNS operations, marketing, and continuous post-delivery improvement for business owners and founders.
• AI Agents (OpenClaw) — AI Employee Placement Placement of OpenClaw-powered autonomous AI employees (Shannon, Dean, Second, Modisa, Tsumugi, Medaka) into client Slack, Teams, or Google Chat environments. Includes AI team design, security configuration, OJT/training, and ongoing operational support for management teams seeking AI-native organizational transformation.
• Claude / OpenClaw Training (AI Direction Training) AI direction and thinking methodology training program that teaches environment design and the "understand/judge/delegate" framework rather than prompt writing. Includes executive seminars and organizational anchoring programs for executives and teams.
• AI × Creative AI-powered creative production service including AItuber production, video/music/manga generation, and LP/web production. Full-service from planning through execution and operations, leveraging character memory architecture and zero-shot voice cloning.
• FOX — AI Tax Agent Self-developed AI tax agent product providing instant AI responses to tax and accounting questions with seamless handoff to human tax accountants for complex judgments. The first revenue-share case developed collaboratively with Forone Tax Office.

Quantifiable outcome

• One AI agent (Dean) handles 5 tax clients simultaneously during peak season
• +3 more outcomes

Named customers2 records

Segments3 records

Ideal customer profiles3 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Integration5 records

AI capability12 records

Feature4 records

Partnerships

One partnership is on record.

• OpenClawcoreTechnology or IntegrationOpenClaw is the foundational AI agent platform used to deploy AI employees into client Slack/Teams environments. Four One Holdings serves as an OpenClaw implementation and operational partner, designing AI teams, providing OJT/training, and supporting ongoing operations. The company also developed OpenClaw-based products including the FOX AI Tax Agent and manages OpenClaw for clients as a core technology partner.

Scale indicators4 records

Recent moves6 records

Expansion highlights5 records

Direct peers

• Pilot.com: Tech-enabled outsourced bookkeeping and accounting service for SMBs combining AI tooling with human accountants — comparable to Forone Tax Office's AI-native tax and accounting model.
• HeyGen: AI video and avatar generation platform used by enterprises for content production; overlaps with BUCHIAGE's AI character/AItuber production capabilities and AI x Creative service line.
• Botkeeper: AI-native bookkeeping and accounting services provider that combines automation with human accountant oversight — directly analogous to Forone Tax Office's FOX AI Tax Agent + human CPA model.
• Lindy AI: US-based AI agent/employee platform that lets SMBs deploy autonomous task agents into their existing workflow tools. Closely matches OpenClaw's positioning as an AI 'colleague' rather than a chatbot.
• Cognosys (now part of a larger platform): AI agent platform for enterprise workflows with a focus on autonomous task execution — comparable to OpenClaw's 'AI employee' framing for B2B deployment.

Regional players

• Stockmark: Japan-based AI company offering LLM-powered enterprise AI agents and document intelligence tools — same Japanese SMB/mid-market segment and enterprise AI agent positioning as Forone.

Broad incumbents

• KPMG Ignite (KPMG Japan): KPMG's AI and digital transformation advisory practice in Japan — directly overlaps with Forone's Big4 DX talent pool, AI advisory services, and enterprise DX client base.

Emerging players

• Relevance AI: Platform for building and deploying AI agents/workers for business operations; comparable to OpenClaw's position as an AI employee deployment platform for enterprise teams.
• Decagon: AI agent platform for enterprise customer experience with proactive, context-aware agents that work alongside human teams — comparable architecture to OpenClaw's Slack/Teams-resident agents.
• Sierra AI: Enterprise AI agent platform for customer service and operations, deploying autonomous agents with guardrails and approval flows — overlaps with OpenClaw's permission-controlled autonomous agent design.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• Xx.com/koforone
• LinkedInlinkedin.com/company/forone-ai

Revenue estimate

Valuation estimate

Number of profiles

Profiles6 records

Subsidiaries1 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 Four One Holdings Co.