B2B Webinar Leader Majisemi Joins ITmedia Group to Navigate Generative AI Marketing Era

Majisemi Co., Ltd. (Headquarters: Chiyoda-ku, Tokyo; CEO: Yuichi Terada), a provider of B2B webinar services, announced on April 1 that it has transferred 100% of its shares to ITmedia Inc. (Headquarters: Chiyoda-ku, Tokyo; President and CEO: Noriyuki Kobayashi), a company listed on the Tokyo Stock Exchange Prime Market, and has joined the ITmedia Group.

As corporate information gathering and marketing methods evolve with the proliferation of Generative AI, Majisemi will leverage ITmedia’s media member base to expand its B2B webinar business into the manufacturing and back-office sectors, in addition to its core IT domain.

■ The Importance of B2B Webinars in the Generative AI Era

The spread of Generative AI is significantly changing how companies collect information. Beyond traditional search engines, the increase in users obtaining information through Generative AI is shifting the structure of traffic to corporate websites.

Furthermore, the digital advertising market is seeing rising costs per click. In corporate marketing activities, there is growing interest in new lead generation methods that do not rely solely on search traffic or advertising.

In this context, webinars (online seminars) are gaining attention as a marketing method that allows companies to establish direct contact and build relationships with prospective customers.

Webinars that attract audiences through media and established member bases are spreading as a reliable method for stable lead generation in the Generative AI era, independent of search traffic and ads.

Webinars, which enable direct communication and relationship building with prospects, are becoming an increasingly vital marketing tool in B2B marketing during the Generative AI age.

■ 2 Million Media Members x Over 1,000 Webinars per Year

Majisemi has supported B2B marketing activities, primarily for IT companies, with a track record of hosting over 1,000 webinars annually. Its integrated services cover planning, audience attraction, and operation. It also boasts its own member base of over 200,000 professionals, primarily in the technology field.

Meanwhile, ITmedia operates numerous specialized media outlets in fields such as IT, manufacturing, IT administration, and back-office sectors, maintaining a member base of approximately 2 million people.

By joining the group, Majisemi will further strengthen its audience attraction capabilities by utilizing ITmedia's extensive member base. By providing marketing support that combines media and webinars, the group aims to assist companies in lead generation and securing business negotiations.

In addition to the IT sector, Majisemi will expand its webinar business into the manufacturing and back-office sectors, broadening its reach in B2B marketing support.

■ Merger with Open Source Research Institute to Unify Operations

The Majisemi brand and services will continue as usual, with Yuichi Terada remaining as CEO. To further integrate operations, accelerate decision-making, and enhance value following the group entry, Majisemi Co., Ltd. absorbed and merged with Open Source Research Institute Co., Ltd. on April 1, 2026, with Majisemi as the surviving entity.

There will be no changes to existing customer contracts or services after joining the ITmedia Group.

■ About Majisemi

Majisemi supports B2B webinars specialized in IT, DX (including manufacturing, construction, logistics, etc.), security, and back-office. We provide one-stop support from planning and secretariat services to hosting and post-event sales follow-up. Clients only need to present on the day. We host over 1,000 webinars annually using a list of over 200,000 professionals, centered on IT systems and DX managers.

Headquarters: 3-12 Kioicho, Chiyoda-ku, Tokyo (Updated as of April 1, 2026).

Service Site: https://majisemi.com

■ Comment from Yuichi Terada, CEO of Majisemi Co., Ltd.

"We are delighted that Majisemi is joining the ITmedia Group. With the rise of Generative AI, B2B marketing is changing. We believe webinars, which offer deep connections between companies and prospects, are more important than ever. By combining our experience of 1,000+ webinars with ITmedia’s 2-million-member base, we can provide even stronger support for corporate growth across wider fields including manufacturing and back-office."

■ Comment from Noriyuki Kobayashi, President and CEO of ITmedia Inc.

"We are very pleased to welcome Majisemi to our group. In an era where Generative AI shifts marketing methods, the importance of direct communication via webinars is at an all-time high. By merging ITmedia's specialized media and vast membership with Majisemi's agile webinar expertise, we have established a system that can ensure stable lead generation independent of search engines. We look forward to delivering new value to our clients."