株式会社カルテットコミュニケーションズ

What 株式会社カルテットコミュニケーションズ does

株式会社カルテットコミュニケーションズ (Quartet Communications Co., Ltd.) is a privately held Japanese digital advertising agency founded in August 2011 and headquartered in Nagoya, with branch offices in Tokyo, Osaka, and Fukuoka. The company specializes in listing (paid search) advertising and SNS advertising operations across 11+ platforms — including Google, Yahoo!, Meta, X, LINE, TikTok, Pinterest, YouTube, SmartNews, and Microsoft Advertising — for more than 4,200 SMB clients spanning over 1,000 industries. It uses a fixed-fee subscription pricing model (¥30,000–¥160,000/month depending on ad spend tier), with no minimum budget or contract term, achieving a 97.4% client retention rate.

The firm's core technology stack centers on two proprietary tools: Lisket (リスケット), an industry-first comprehensive listing advertising operation support tool providing campaign management and keyword optimization, and 無限GAレポートメーカー, a Google Analytics reporting automation tool priced at ¥4,000/month. These complement the human operator layer rather than replace it; the company explicitly emphasizes 15 years of specialized operator expertise and direct client communication as differentiators. Quartet has expanded its productized service surface with a Salesforce DX (digital transformation) implementation offering, positioning to capture a wider share of client digital infrastructure spend.

Revenue mechanics combine subscription agency fees (recurring monthly billing), pass-through media spend on behalf of clients, and ancillary productized tool revenue (Lisket, GA Report Maker, Salesforce DX). Go-to-market is sales-led through direct phone/contact-form inquiries, partner referrals from a 1,500+ agency and HP production company network (described as the largest in Japan), and content marketing via a 1,800+ article blog driving inbound SMB leads. Customer segments are horizontally diversified across SMBs and a secondary channel of partner agencies that outsource operations. The firm holds top-tier certifications including Google Premier Partner, LINE Yahoo Sales Partner, Microsoft Advertising Elite Partner, TikTok Platinum, and JICDAQ quality/brand-safety certifications, and operates with a lean team of 23 employees.

Name

株式会社カルテットコミュニケーションズ

Legal name

株式会社カルテットコミュニケーションズ

Website

https://quartet-communications.com

Company type

Private

Founded year

2011

Operating status

Operating

Headcount range

11–50 employees

Short description

Quartet Communications is a Nagoya-headquartered Japanese SMB digital advertising agency managing listing and SNS ad campaigns across 11+ platforms for 4,200+ clients, using a fixed-fee subscription model with proprietary operational tools (Lisket, GA Report Maker) and a 97.4% retention rate.

Ownership category

akta.pro rank

Product category

Digital Advertising Services

NAICS

Media Buying Agencies (541830), Media Buying Agencies (54183), Advertising, Public Relations, and Related Services (5418)

SIC

Services-Advertising Agencies (7311), Services-Advertising (7310)

akta.pro primary industry

Affiliate Marketing & Partner Program Management (MPAAACAD)

akta.pro secondary industries

Video/CTV/OTT Media Buying (MPAAABAE), Affiliate & Partner Marketing (Performance Partnerships) (BPAFACAE)

Keywords

• Listing advertising management
• Paid search advertising
• SNS advertising agency
• Digital marketing services
• Search engine marketing

Headquarters

HQ city

Nagoya

HQ country

Japan

HQ region

Asia

Offices4 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. Advertising Agency Fee (Fixed Subscription): Monthly fixed agency fees charged regardless of advertising spend volume, plus actual media costs. Fee tiers: Tier 1 ¥30,000/month (ad spend up to ¥200,000), Tier 2 ¥50,000/month (up to ¥400,000), Tier 3 ¥100,000/month (up to ¥700,000), Tier 4 ¥160,000/month (up to ¥1,000,000). No minimum advertising budget, no minimum contract period, initial cost from ¥0.

Pricing tiers

Go-to-market motion1 record

Distribution channels2 records

Marketing channels5 records

Core offering

Quartet Communications is a digital advertising agency that manages listing (search) advertising and SNS advertising campaigns on behalf of business clients. It operates on a transparent fixed-fee pricing model starting at ¥30,000/month, serving 4,200+ clients across 1,000+ industries with a 97.4% retention rate. The agency supplements its management services with proprietary in-house tools (Lisket and 無限GAレポートメーカー) that automate reporting and ad operations.

Product overview

株式会社カルテットコミュニケーションズ operates a multi-product digital marketing portfolio centered on listing (paid search) advertising management. The core offering is its listing advertising agency service, which manages campaigns across Google, Yahoo!, Meta, X, LINE, TikTok, Pinterest, YouTube, SmartNews, and Microsoft Advertising platforms using a fixed-fee pricing model starting at ¥30,000/month. This core service is supplemented by two proprietary software tools: Lisket, an industry-first listing advertising operation support tool, and 無限GAレポートメーカー, a GA reporting automation service at ¥4,000/month. A Salesforce DX implementation support service rounds out the portfolio, offering consulting alongside advertising management to address clients' broader digital transformation needs. The company maintains partner certifications with Google (Premier Partner), LINE Yahoo!, Microsoft (Elite Partner), Meta, X, TikTok, and Indeed, and holds JICDAQ quality and brand safety certifications.

Differentiator

Problem solved

Functional benefit

Brands

• Lisket（リスケット）: 業界初のリスティング広告運用総合支援ツール (Industry's first comprehensive listing advertising operation support tool).
• 無限GAレポートメーカー
• Salesforce導入支援サービス

Products and services

• Listing Advertising Management Service (リスティング広告運用代行) End-to-end paid search (listing) advertising management service for Japanese businesses, covering campaign setup, keyword targeting, optimization, and reporting. Operated on a transparent fixed monthly fee starting at ¥30,000/month, serving 4,200+ clients across 1,000+ industries.
• SNS Advertising Management Service (SNS広告運用代行) Social networking service (SNS) advertising operations and management service for Japanese businesses, covering campaign planning, execution, and optimization across major social platforms. Offered as an agency service alongside the listing advertising management offering.
• Lisket (リスケット) Proprietary SaaS platform developed by Quartet Communications for listing advertising management, supporting keyword research, performance tracking, and competitor analysis functions used by the company's own agency team and available to advertiser clients.
• Mugen GA Report Maker (無限GAレポートメーカー) Proprietary Google Analytics reporting automation tool that generates standardized GA reports for advertisers, supporting the agency's reporting workflows and offering automation benefits to clients.
• Salesforce Implementation Support (Salesforce導入支援) Salesforce CRM implementation and integration support service for Japanese businesses, complementary to the company's core advertising management offerings, bridging marketing and sales infrastructure.

Quantifiable outcome

• Client retention rate of 97.4%
• +2 more outcomes

Named customers10 records

Segments2 records

Ideal customer profiles2 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature2 records

Partnerships

Four partnerships are on record, tiered core.

• Google (Google広告/Youtube/Meta/Microsoft)coreTechnology or IntegrationMultiple platform certifications: Google Premier Partner (PremierBadge), LINE Yahoo Sales Partner, Microsoft Advertising Elite Partner, Meta Business Partner, X Ads Authorized Partner, TikTok for Business SMB Agency Advantage Program Platinum Rank, Indeed Certified Partner. These represent official certification partnerships with major digital advertising platforms.
• JICDAQ ((一社)デジタル广告品質認証機構)coreTechnology or IntegrationJICDAQ quality certified operator for invalid traffic countermeasures (无效トラフィック対策認証) and brand safety (ブランドセーフティ認証), demonstrating commitment to advertising quality standards.
• LINEヤフー株式会社 (LINE Yahoo Corporation)coreChannel Partner/ Reseller/ DistributorOfficial LINE Sales Partner (セールスパートナー). LINE Yahoo officially recommends Quartet as a listing advertising partner, citing their fixed-fee model, 4,200+ client track record, small budget handling capability, and comprehensive support from proposal through reporting.
• 1,500+ Partner Companies (广告代理店・制作会社)coreChannel Partner/ Reseller/ Distributor1,500+ partner companies including advertising agencies and HP production companies who refer clients or outsource listing/SNS operations to Quartet. Described as the largest partner network in Japan for listing advertising sub-contracting.

Scale indicators6 records

Recent moves2 records

Expansion highlights5 records

Direct peers

• Fullspeed (株式会社フルスピード): Japanese performance marketing agency focused on affiliate, listing, and SNS advertising operations. Directly comparable operating model to Quartet's fixed-fee listing-ad management for SMB clients.
• Allied Architects (株式会社アライドアーキテクツ): Japanese digital marketing company with strong SNS/Influencer and performance ad operations. Comparable to Quartet's paid social and listing-ad services across multiple platforms for Japanese advertisers.
• Septeni Holdings (セプテーニ・ホールディングス): Public Japanese digital advertising group offering performance ads, creative, and SNS ad operations across multiple platforms. Closely comparable to Quartet on multi-platform paid social/search management for Japanese advertisers.
• Adways (株式会社アドウェイズ): Japan-based digital advertising and marketing company with a strong focus on affiliate, mobile, and performance advertising across SNS platforms. Overlaps with Quartet on multi-platform paid advertising operations for Japanese advertisers.
• IREP (株式会社アイレップ): One of Japan's most established SEM and digital advertising specialists, providing paid search, display, and SEO services to Japanese brands. Direct competitor to Quartet in listing-ad operations with a similar SMB-to-enterprise client mix.
• GMO AD Partners (GMOアドパートナーズ株式会社): Digital advertising arm of the GMO group offering SEM, ad-network and affiliate marketing in Japan. Direct competitor in the same listing/SNS ad operations category as Quartet.

Emerging players

• KlientBoost: US-based performance marketing agency specializing in PPC, paid social, and landing-page optimization for SMB and mid-market clients. Comparable service mix to Quartet (paid search + paid social management) with a similar focus on SMB clients, though operating in a different geography.
• Disruptive Advertising: US-based digital advertising agency focused on paid search, paid social and SEO for mid-market and enterprise clients. Comparable to Quartet in its single-category paid-search specialization and platform certification focus, though serving US rather than Japanese clients.

Broad incumbents

• Hakuhodo DY Digital (株式会社博報堂DYデジタル): Digital marketing subsidiary of Hakuhodo DY Holdings, providing full-stack digital advertising services to enterprise clients in Japan. Comparable in capability but operates as a broad incumbent rather than an SMB-specialist.
• Dentsu Digital (株式会社電通デジタル): Digital arm of Japan's largest advertising group, providing full-service digital marketing including SEM, programmatic, and creative. Larger, broader competitor with overlapping listing-ad capabilities but serving a much wider client portfolio.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• Xx.com/quartetcom
• Facebookfacebook.com/quartetcommunications
• LinkedInlinkedin.com/company/%E6%A0%AA%E5%BC%8F%E4%BC%9A%E7%A4%BE%E3%82%AB%E3%83%AB%E3%83%86%E3%83%83%E3%83%88%E3%82%B3%E3%83%9F%E3%83%A5%E3%83%8B%E3%82%B1%E3%83%BC%E3%82%B7%E3%83%A7%E3%83%B3%E3%82%BA

Compliance3 records

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 株式会社カルテットコミュニケーションズ