What CARTA HOLDINGS does

CARTA HOLDINGS is a Tokyo-based digital marketing holding company that operates a multi-brand portfolio of advertising technology, data, and integrated marketing services across Japan, with growing presence in Korea and Vietnam. Its core platforms are the fluct Supply-Side Platform (SSP), the Zucks smartphone CPC/CPI ad network, the PORTO DSP for brand advertisers, the TELECY programmatic TV advertising service, and BID STRAP / DATA STRAP / GOLDSPOT header-bidding and rich-media tools. On the services side, CARTA ZERO delivers integrated marketing spanning strategy, creative, social, and media buying, while DataCurrent, Data Dig, and CARTA ZERO ANALYTICS provide data consulting and cookieless measurement. The group also runs owned media (Kamigame game-information site, French Bulldog Life and other pet verticals, e-commerce properties) and CARTA VENTURES as a corporate venture arm.

The company makes money through a mix of transaction-fee digital advertising (SSP revenue share, CPC/CPI/CPM advertiser spend, programmatic TV fees), professional services fees from integrated marketing engagements, advertising on owned media, and venture investment returns. Distribution combines self-serve platform access (fluct, Zucks, PORTO) with direct enterprise sales via CARTA ZERO and TELECY dedicated account teams, including major-case support for clients such as Hitachi Industrial Control Solutions.

Following NTT DOCOMO's 2025 tender offer taking majority ownership (51.61%) alongside Dentsu Group (48.39%), CARTA went private in 2026, absorbed D2C Inc. as a wholly-owned subsidiary, and joined the DOCOMO Group — giving it privileged access to NTT DOCOMO's data assets via the 'docomo data square' data clean room. The most material recent strategic move is a March 2026 joint AI-advertising product with Dentsu, Dentsu Digital, D2C, and NTT DOCOMO integrated with Google Performance Max, which roughly 20 advertisers have already adopted. Headcount stood at 1,269 consolidated employees as of December 2024, down from 1,378 a year earlier, indicating an ongoing efficiency phase overlaid with the new AI and data-driven offensive.

Name

CARTA HOLDINGS

Legal name

株式会社CARTA HOLDINGS

Website

https://cartaholdings.co.jp

Company type

Public

Founded year

1999

Operating status

Operating

Headcount range

1,001–5,000 employees

Short description

Tokyo-based digital marketing holding company operating SSP (fluct), smartphone ad networks (Zucks), DSP (PORTO), programmatic TV (TELECY), and integrated marketing services (CARTA ZERO) for enterprise advertisers and publishers, majority-owned by NTT DOCOMO and Dentsu Group since 2026.

Ownership category

akta.pro rank

Product category

Digital Marketing Services

NAICS

Direct Mail Advertising (54186)

SIC

Services-Direct Mail Advertising Services (7331)

akta.pro primary industry

Marketing Technology, AdTech & MarTech Services (BPAFAAAN)

Keywords

• Digital marketing services
• Programmatic advertising platforms
• Advertising technology solutions
• Data-driven marketing
• Integrated marketing services

Headquarters

HQ city

Tokyo

HQ country

Japan

HQ region

Asia

Offices5 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. Digital Advertising Services: Revenue from advertising platform operations including SSP (fluct), ad networks (Zucks), DSP (PORTO), and programmatic services. Includes revenue share from publisher ad inventory, advertiser spending on CPC/CPI/CPM campaigns, and programmatic TV advertising fees.
2. Integrated Marketing Solutions: Comprehensive digital marketing services through CARTA ZERO covering strategic planning, traditional advertising, digital ads, social media management, and creative services for enterprise clients.
3. Data Analytics and Consulting: Data marketing services including DataCurrent consulting, CARTA ZERO ANALYTICS, and Data Dig services for cookieless data marketing solutions.
4. Media and Content: Revenue from pet media sites (French Bulldog Life, Shiba-Inu Life, Retriever Life, Dachshund Life, Toy Poodle Life), game information sites (Kamigame), e-commerce sites (Ta-Ta supplements, THE fu-do dog food), and lifestyle media.
5. Venture Capital: Investment returns from CARTA VENTURES focusing on startups and venture businesses with high growth potential in internet-related sectors.

Go-to-market motion3 records

Distribution channels7 records

Marketing channels11 records

Core offering

CARTA HOLDINGS is a digital marketing holding company that operates proprietary advertising technology platforms including the fluct Supply-Side Platform (SSP), Zucks smartphone ad network, PORTO Demand-Side Platform (DSP), and TELECY programmatic TV advertising platform. The company delivers integrated digital marketing solutions spanning strategic planning, digital advertising operations, data analytics, social media management, and creative production, primarily serving enterprise marketers, digital publishers, and app developers across Japan and East Asia.

Product overview

CARTA HOLDINGS operates as a digital marketing holding company (Tokyo-based, Dentsu Group subsidiary with NTT Docomo as majority shareholder) offering a multi-brand portfolio of advertising technology, data analytics, and digital transformation solutions. The product portfolio includes integrated marketing (CARTA ZERO), SSP/advertising platforms (fluct, Zucks, PORTO), programmatic TV (TELECY), data services (DataCurrent, Data Dig, CARTA ZERO ANALYTICS), ad operations tools (KNOTBOX, CARTA KNOT, BID STRAP, DATA STRAP, lake.bi), retail/healthcare DX (Digiclue, enpas), media content sites, and supporting services including venture capital and marketing education (D-Marketing Academy). The company provides both standalone products and integrated solutions across digital advertising, marketing technology, and business transformation.

Differentiator

Problem solved

Functional benefit

Brands

• Zucks: Advertising network for smartphone CPC and CPI ads
• PORTO
• fluct
• TELECY
• CARTA KNOT
• Social AdTrim
• KNOTBOX
• Data Dig
• Commerce Container
• D-Marketing Academy
• Kamigame
• French Bulldog Life
• Shiba-Inu Life
• Gen Z Study Group (Z-Ken)

Products and services

• CARTA ZERO Integrated marketing division providing comprehensive integrated marketing solutions covering strategic planning, traditional advertising, digital ads, social media management, and creative services for enterprise clients.
• fluct SSP Supply-Side Platform (SSP) that boosts media revenue through high DSP connection counts, variety of devices, and extensive range of formats and distribution methods for digital publishers.
• Zucks Ad Network Dedicated advertising network for smartphone CPC ads implementing promotions with optimizing functions, fine-grained management, and extensive distribution menus.
• Zucks Affiliate Dedicated advertising network for smartphone CPI ads enabling performance-based remuneration for high-quality user acquisition while controlling risk.
• PORTO Advertising platform (DSP) for brand advertisers enabling integrated management and analysis through programmatic use of various online and offline media.
• TELECY Programmatic TV advertising platform offering terrestrial TV commercials starting at low cost, with advertising impact assessment using CPM, CPA, CPI metrics and end-to-end execution including strategy formulation, CM planning/production, impact assessment, and PDCA.
• Social AdTrim One-stop social media advertising and social media account management service with integrated consulting by dedicated social media team using proprietary analysis tools.
• KNOTBOX LINE API-based marketing platform for acquiring, analyzing, and visualizing user information associated with official LINE accounts.
• Data Dig Cookieless-compatible data marketing service providing support from deployment/management of data analysis and measurement technology to strategy formulation.
• CARTA ZERO ANALYTICS Analytical service providing integrated support for strategy and KPI setting, analytical approach design, and tool deployment/management.
• DataCurrent Data consulting and data platform development/management service supporting data marketing including formulation, execution, and support for data-driven strategies.
• Commerce Container E-commerce sales promotion support service covering major EC market channels from large EC malls and in-house EC to social commerce.
• Digiclue Retail DX support service covering DX planning and sales promotion, planning/development of owned apps and specialist solutions, and data utilization support.
• enpas Dispensing pharmacy DX platform providing patient communication and linking LINE to electronic medical receipt systems, supporting shift to community pharmacy.
• BID STRAP Header bidding wrapper solution that generates new revenue opportunities by sending simultaneous requests to multiple bidders to implement multiple auctions for publishers.
• GOLDSPOT Rich media and streaming advertisement production and distribution solution for multiple devices, enhancing brand image through creative advertising formats.
• CARTA KNOT Programmatic digital advertising operations service covering strategy formulation, consulting, creative production/checking, and PDCA operation.
• D-Marketing Academy Digital marketer training platform offering practical e-learning using streamed content for corporate web marketer education.
• CARTA VENTURES Venture capital entity investing in startups and venture businesses with high growth potential in internet-related sectors.

Quantifiable outcome

• Approximately 20 companies have adopted the next-generation AI-powered advertising delivery solution, achieving measurable improvements in CPA efficiency through Google Performance Max integration

Named customers1 record

Segments6 records

Ideal customer profiles4 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

AI capability5 records

Feature10 records

Partnerships

Eight partnerships are on record, tiered core and minor.

• NTT Docomo (docomo data square)coreTechnology or Integration · 10 March 2026Partnership for next-generation AI-powered advertising delivery solution. Leverages Docomo's large-scale data through 'docomo data square' data clean room as AI learning signals for advertising platform optimization. Solution generates high-precision prospect lists by combining Docomo data multidimensionaly.
• Dentsu / Dentsu Digital / D2CcoreStrategic or Co-development Partner · 10 March 2026Joint development of AI-powered advertising delivery solution. Dentsu and Dentsu Digital provide advertising expertise and integration capabilities, with D2C executing marketing support around NTT DOCOMO products and data.
• Koshu City, Yamanashi PrefectureminorOthersForest conservation partnership. Signed forest management agreement in October 2024 for 4.53 hectares of forest as 'CARTA Forest' project. Ongoing forest conservation activities including tree planting, thinning, and access path maintenance.
• Japan Interactive Advertising Association (JIAA)minorOthersIndustry association membership. CARTA complies with JIAA Internet Advertising Code of Ethics and participates in discussions for healthy digital advertising market development.
• Data Driven Advertising Initiative (DDAI)minorOthersIndustry initiative membership for data-driven advertising best practices and standards.
• Japan Joint Industry Committees for Digital Advertising Quality (JICDAQ)minorOthersThird-party verification certification for ad fraud and brand safety. CARTA obtained certification as advertising company (ad buyer) on December 1, 2021.
• Lambda NotesminorStrategic or Co-development PartnerPublisher partnership for engineering books. Lambda Notes published 'Engineers in VOYAGE' (2020) and revised edition '事業をエンジニアリングする技術者たち' (2022), which won IT Engineer Book Award 2021.
• O'Reilly MediaminorOthersCARTA provides O'Reilly Online Learning platform access to engineers for continuous professional development and skill improvement.

Scale indicators9 records

Recent moves14 records

Expansion highlights6 records

Broad incumbents

• Dentsu Group: Global advertising holding company and 48.39% shareholder of CARTA HOLDINGS. Operates a broad portfolio spanning creative, media, CXM, and digital, with significant overlap in Japanese digital advertising and data-driven marketing services.
• Hakuhodo DY Holdings: Second-largest Japanese advertising holding company, offering integrated advertising, digital marketing, content, and data services. Directly competes with CARTA in Japanese enterprise marketing solutions.
• Adobe Advertising: Adobe's advertising cloud (formerly TubeMogul) provides DSP and programmatic media buying capabilities. Comparable to CARTA's PORTO DSP and competes in cross-channel advertiser campaign management.
• CyberAgent: Major Japanese internet advertising company, historically connected to VOYAGE GROUP through a capital alliance. Operates one of Japan's largest digital ad businesses including the ABEMA streaming platform and digital agency divisions.

Direct peers

• PubMatic: Independent global SSP providing header bidding and programmatic monetization infrastructure. Closely comparable to fluct SSP in sell-side technology and publisher revenue optimization.
• Magnite: Global independent SSP, post-Telaria merger. Most direct global comparable to fluct SSP, offering header bidding and CTV/online video inventory monetization at scale.
• The Trade Desk: Global independent DSP leader. Direct functional comparable to CARTA's PORTO DSP, competing for the same brand advertiser programmatic budgets across display, video, CTV, and audio.
• Septeni Holdings: Japanese digital marketing holding company operating ad networks, DSP, and integrated digital advertising services. Closely comparable to CARTA in business model, particularly in performance-based mobile ad networks and DSP operations.
• FreakOut Holdings: Japanese ad tech company operating a DSP and integrated digital marketing platform. Direct competitor to CARTA's PORTO DSP and programmatic advertising offerings, with similar focus on data-driven campaign execution.

Regional players

• Intage Holdings: Japanese marketing research and data analytics company providing consumer insights, data platforms, and consulting. Comparable to CARTA's DataCurrent and CARTA ZERO ANALYTICS data consulting subsidiaries.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat6 records

Key risks5 records

Key highlights6 records

Customer concentration

• Xx.com/CARTA_HOLDINGS
• YouTubeyoutube.com/@CARTAEngineering
• Facebookfacebook.com/cartaholdings
• Instagraminstagram.com/carta_holdings
• LinkedInlinkedin.com/company/porto-carta

Compliance7 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles15 records

Subsidiaries16 records

Funding overview

Funding rounds

Investors

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

M&A2 records

Investments

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

Frequently asked questions about CARTA HOLDINGS