What StockSun does

StockSun Inc. (StockSun株式会社) is a Tokyo-based digital marketing services firm founded in 2017 that delivers fixed-rate web marketing, sales, and recruitment outsourcing to Japanese enterprises, mid-market companies, and SMEs. Its core offering is a family of subscription retainer packages — Makitoru-kun (from 100,000 yen/month), Karitoru-kun, Torutoru-kun, and the clinic-specialized Makitori Medical tier (150,000–300,000 yen/month) — that embed a dedicated certified-partner consultant under a director into the client team. Services span SEO, paid acquisition, social media, YouTube/TikTok, video production, website production, LINE marketing, DX, and system development. The underlying delivery model is a curated supply-side network rather than a proprietary technology platform: StockSun maintains a 2,000+ certified-partner freelancer pool screened at what the company characterizes as roughly a <1% acceptance rate, with monthly ranking and removal for quality shortfalls. There is no disclosed proprietary software platform; the company leverages standard marketing technology stacks (Google Analytics, SEO tools, ad platforms, CRM, LINE) on behalf of clients.

The business operates a hybrid go-to-market combining a consultation-first direct sales motion (website, LINE, phone, free-trial onboarding) with a B2B2C certified-partner channel that generates both delivery capacity and revenue share from partner-originated engagements. Monetization spans subscription retainers, project-based consulting, certified-partner management fees on project margins (with no client-side markup), and complementary streams including the StockSun Dojo online school, the StockSun online salon community, the Ainori AI implementation service, and the freemium Chaos Map vendor-classification content series. Pricing is largely subscription-based with tiered monthly retainers in Japanese yen and a free one-month trial for flagship engagements. Named enterprise customers span Dentsu Research Institute, Open House Group, Murata Manufacturing, KADOKAWA, Irevar Group, Coach A, ZUU, Toyoshima, Yamada Consulting Group, Baro Holdings, Konica Minolta Japan, and Lipo Clinic — evidencing a multi-industry client base rather than vertical concentration.

Management is led by CEO Keisuke Iwano (岩野圭佑) with Director Yuki Kabumoto (株本祐己). The current strategic posture is conspicuous for its listing-readiness signals: StockSun is actively recruiting a full-time statutory auditor and an internal audit office head, has expanded its advisory team around the explicit 'withstand listing standards' framing, and has made senior hires for marketing management and customer success. Distribution capacity has been extended via a 2024 service alliance with Opt Co., Ltd. The company has not disclosed any funding rounds, acquisitions, or material ownership changes, and operates from dual Shinjuku, Tokyo office locations.

Name

StockSun

Legal name

StockSun株式会社 (StockSun Inc.)

Website

https://stock-sun.com

Company type

Private

Founded year

2017

Operating status

Operating

Headcount range

51–100 employees

Ownership category

akta.pro rank

Headquarters

HQ city

Tokyo

HQ country

Japan

HQ region

Asia

Offices2 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. Subscription-based Web Marketing Retainer Services (BPO): StockSun's primary revenue stream comes from fixed-monthly retainer services where the company takes responsibility for ongoing web marketing execution on behalf of clients. Services include Makitoru-kun (定制定額Webマーケティング代行), Karitoru-kun (営業代行), Torutoru-kun (採用代行/RPO), LINE Makitoru-kun, Douga Karitoru-kun, and Bansou LP. These are sold as monthly subscriptions with defined hours/_scope. The model provides predictable recurring revenue and creates switching costs through accumulated client knowledge and integrated team relationships.
2. Certified Partner Network Management Fees: StockSun generates revenue by collecting management/operation fees from certified partners on project gross profit. The company states it does not markup client fees (no '中抜き' in the agency fee sense), but takes a percentage of project margins from partners. This creates a B2B2C revenue layer where independent consultants deliver services and share economics with StockSun.
3. Project-based Consulting and Execution Services: Custom tailored web consulting engagements, site production, advertising operations, SEO, YouTube/TikTok management, DX, and system development are billed as project or retainer engagements. These include one-time setup fees (e.g., initial 150,000 JPY for Makitori Medical) plus recurring monthly fees.
4. Education and Training (StockSun道場 / Salon): StockSun operates online schools (StockSun道場) for video editing, engineering, advertising, and YouTube directing, as well as an online salon community. These generate subscription or membership revenue from individual learners and freelancers seeking skill development.

Pricing tiers

Go-to-market motion3 records

Distribution channels3 records

Marketing channels9 records

Core offering

StockSun provides subscription-based digital marketing BPO and consulting services delivered through a vetted certified partner network of 2,000+ freelancers, covering web marketing, advertising, sales operations, recruitment, LINE marketing, video production, and SEO/LP production for business clients. The company also operates an online education school (StockSun Dojo), an online community (StockSun Salon), and a content library (Chaos Maps) to support its marketing authority and lead generation.

Differentiator

Problem solved

Functional benefit

Brands

• マキトルくん (Makitoru-kun): Subscription-based web marketing outsourcing service starting at 100,000 yen per month
• カリトルくん (Karitoru-kun)
• トルトルくん (Torutoru-kun)
• 動画でカリトルくん
• LINEマキトルくん
• あいのりAI (Ainori AI)
• まるごと社長
• SEOトライアル
• 最強LP
• トリトル (Toritoru)
• マキトリンメディカル (Makitori Medical)

Products and services

• Makitoru-kun (Web marketing outsourcing)
• Karitoru-kun (Sales outsourcing) Fixed-rate sales process outsourcing subscription for businesses that need to scale sales operations and lead handling through vetted sales freelancers.
• Torutoru-kun (Recruitment outsourcing) Fixed-rate recruitment process outsourcing subscription for businesses that need ongoing hiring support from recruitment specialists in the partner network.
• Douga Karitoru-kun (Video production for sales) Outsourced video production service for businesses seeking sales-oriented video content delivered by specialist partners in the StockSun network.
• LINE Makitoru-kun (LINE marketing outsourcing) Outsourced LINE marketing operations service for businesses running campaigns and customer engagement on LINE, delivered by LINE-specialist partners.
• Ainori AI (Low-cost AI implementation support) Low-cost AI implementation support service for businesses that want to integrate AI tools into their operations without large upfront investment.
• Marugoto Shacho (One-day video production) One-day immersive video production and distribution service aimed at businesses that want to produce and distribute video content quickly as a complete package.
• Bansou LP (Subscription LP production) Subscription landing page production and continuous improvement service for businesses that need ongoing LP creation, testing, and optimization.
• Toritoru (Recruitment YouTube channel) Service for building recruitment-focused YouTube channels to support employer branding and hiring pipelines.
• Makitori Medical (Clinic-specialized web marketing) Fixed-rate monthly web marketing support tailored specifically to clinics and medical practices that lack dedicated internal marketing resources.
• StockSun Dojo (Online education school) Online education school offering digital marketing training courses for individuals seeking to upskill in web marketing, sales, recruitment, or related fields.
• StockSun Salon (Online community) Membership-based online community providing ongoing marketing knowledge sharing, networking, and content access for members.

Quantifiable outcome

• 200% increase in conversions
• +3 more outcomes

Named customers12 records

Ideal customer profiles2 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Integration3 records

AI capability4 records

Partnerships

Three partnerships are on record, tiered core and minor.

• Search Ranking Pirates Inc. (Search Ranking Pirates Co., Ltd.)coreStrategic or Co-development Partner · 19 March 2026StockSun collaborates with Search Ranking Pirates Inc. (海盗搜索引擎公司) on the 'Chaos Map' series of industry classification guides. Together they have published the Website Production Company Chaos Map 2026 (74 companies, 10 categories), the SNS Advertising Agency Chaos Map 2026 (31-32 companies, 5 categories), the Advertising Agency Chaos Map 2026 (32 companies, 6 categories), and the Shopify Production Chaos Map 2026 (36 companies, 6 categories). These are free resources designed to help businesses navigate the fragmented vendor market.
• 株式会社オプト (Opt Co., Ltd.)coreStrategic or Co-development Partner · 31 October 2024StockSun and Opt Co., Ltd. announced a service alliance, integrating certain service offerings between the two companies. Opt is a major Japanese digital marketing agency. The alliance allows StockSun to extend its service capabilities and reach through Opt's established client base, while Opt gains access to StockSun's certified partner network and specialized execution capabilities.
• 兼松グランクス (Kanematsu Granks)minorStrategic or Co-development Partner · 23 February 2023StockSun and Kanematsu Granks announced a partnership to begin comic video marketing support. This collaboration integrates StockSun's web marketing expertise with Kanematsu Granks' comic video production capabilities to offer businesses a combined content marketing solution.

Scale indicators7 records

Recent moves7 records

Expansion highlights6 records

Direct peers

• Digital Garage: Digital Garage is a publicly listed Japanese group with digital marketing, advertising technology, and fintech businesses. Its digital marketing segment competes with StockSun for Japanese advertiser budgets, while its platform/tech businesses offer a different model—useful for benchmarking StockSun's evolution toward productized services.
• FreakOut Holdings: FreakOut Holdings operates a Japanese digital advertising platform business including DSP, programmatic buying, and a Southeast Asian ad-tech footprint. Comparable to StockSun on the demand-side platform and performance-marketing execution layer, though FreakOut leans more heavily on proprietary ad tech than on freelance delivery.
• Allied Architects: Allied Architects is a Japanese digital marketing firm providing advertising operations, creative, and DX consulting to mid-market clients. StockSun and Allied Architects overlap in serving Japanese SMEs/mid-market advertisers seeking outsourced digital marketing execution, and compete for overlapping client logos.
• Septeni Holdings: Septeni Holdings operates a Japanese digital marketing agency group covering performance advertising, creative, and social media—overlapping directly with StockSun's web advertising, SNS, and SEO retainer services. Both serve Japanese advertisers with subscription and execution-based engagement models, and both compete for the same freelance/agency talent pool.
• MicroAd: MicroAd is a publicly listed Japanese digital advertising technology and agency platform offering DSP/SSP products alongside managed services. Comparable to StockSun in serving Japanese advertisers with performance-driven digital marketing execution, with deeper proprietary tech and lower dependence on freelance delivery.
• Opt Co., Ltd. Opt is a major Japanese digital marketing agency whose service portfolio (digital advertising, marketing DX, creative) closely mirrors StockSun's. Opt is also a StockSun strategic-alliance partner (announced October 2024), making it simultaneously a peer and a channel partner for reaching Opt's enterprise client base.

Broad incumbents

• CyberAgent: CyberAgent operates one of Japan's largest internet advertising businesses (CA Internet Advertising), serving SMEs and large advertisers with display, video, and performance campaigns via platforms like Ameba and ABEMA. It is a much larger incumbent but offers overlapping digital marketing execution services comparable to StockSun's retainer offerings.
• Hakuhodo DY Holdings: Hakuhodo DY Holdings is the second-largest Japanese advertising group, offering integrated digital marketing, creative, and media services across the same customer segments StockSun targets. As a broad incumbent, its scale and brand present a competitive ceiling that StockSun must navigate under for enterprise share.
• Dentsu Digital: Dentsu Digital is the digital arm of Japan's largest advertising group and provides integrated digital marketing services including advertising, consulting, and CRM to enterprise clients. It competes with StockSun for enterprise digital marketing budgets (Dentsu Research Institute is already a StockSun client), though Dentsu Digital serves the top tier of the market.
• ValueCommerce: ValueCommerce, a subsidiary of LY Corporation (Yahoo Japan/Z Holdings), operates one of Japan's largest affiliate marketing and performance advertising platforms. It is a broad incumbent in the Japanese digital advertising ecosystem that intersects with StockSun's web advertising and SEO service lines at the channel layer.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights6 records

Customer concentration

• Xx.com/stocksun__
• LinkedInlinkedin.com/company/stocksun

Revenue estimate

Valuation estimate

Number of profiles

Profiles2 records

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 StockSun