TAMMI

What TAMMI does

Tammi is one of Finland's largest book publishers, founded in 1943 and headquartered in Helsinki. The company publishes Finnish-language and translated fiction, non-fiction, and children's/YA literature, and holds the market-leading position in Finnish children's and juvenile book publishing. Tammi operates as a subsidiary of Werner Söderström Osakeyhtiö (WSOY), itself owned by Sweden's Bonnier Books group, and sits alongside sibling imprints including WSOY, Johnny Kniga, Readme.fi, Kosmos, Bazar, Docendo, and Crime Time. The company is led by Timo Julkunen (CEO of WSOY) with a leadership team that includes dedicated publishers for translated fiction, non-fiction, and children's & youth categories, plus sales, marketing, e-commerce, and brand management functions.

Tammi's product portfolio is organized around three core publishing lines: domestic fiction, translated fiction, and non-fiction, alongside the market-leading children's and youth literature line. Catalog depth is built on franchise-style author series, including Max Seeck's thriller novels (Daniel Kuisma and Milo series, with multiple Lasiavain/NYT bestseller accolades), Siri Kolu's YA fantasy trilogies (Kaksoismaailmat and Varjopäivä), Paula Noronen's Supermarsu and Yökoulu children's series (the former adapted into theatrical films), and Pirjo Tuominen's historical Suuriruhtinaanmaa trilogy. Distribution spans physical books (hardcover, paperback/pokkari, softcover), digital e-books (epub2/epub3), and audiobooks via the Bookbeat platform; complementary services include the Kirja.fi online store and physical bookstore in Helsinki and the Tammi Kuvapankki media bank for press assets.

Revenue is generated through four primary streams: physical book retail sales (through bookstores and kirja.fi), digital book and audiobook sales via Bookbeat and kirja.fi, international translation rights licensing through Bonnier Rights (deals in 50+ countries), and film/TV rights licensing (including a seven-figure deal for SenLinYu's Alchemised and TV development of Max Seeck's Merkitty). The customer base is primarily Finnish general consumers across age segments, with institutional sales to Finnish libraries and schools as a secondary channel.

Name

TAMMI

Legal name

Tammi

Website

https://tammi.fi

Company type

Private

Founded year

1943

Operating status

Operating

Headcount range

11–50 employees

Short description

Tammi is a Finland-based book publisher (founded 1943) and the market leader in Finnish children's and juvenile literature, publishing domestic and translated fiction, non-fiction, and children's/YA books in print, e-book, and audiobook formats.

Ownership category

akta.pro rank

Product category

Book Publishing

NAICS

Book Publishers (513130)

SIC

Books: Publishing Or Publishing & Printing (2731), Book Printing (2732)

akta.pro primary industry

Trade Book Print-on-Demand (Fiction & Nonfiction) (MPAJANAA)

akta.pro secondary industries

Young Adult (YA) Publishing (MPAJAFAD), Accessible & Alternative Format Materials (Braille, Large Print, Audio, Tactile Graphics) (EDAGAMAD)

Keywords

• Book publishing
• Children's literature
• Fiction publishing
• Audiobook distribution
• Literary rights licensing

Headquarters

HQ city

Helsinki

HQ country

Finland

HQ region

Europe

Offices2 records

Markets served

GTM type

B2C

Offering type

Services

Cost components

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

Revenue model

1. Physical Book Sales: Revenue from sale of printed books in multiple formats: hardcover (kovakantinen), paperback (pokkari), and softcover (pehmeäkantinen). Books sold through retail bookstores, kirja.fi e-commerce, and book chains.
2. Digital Book Sales: E-books (epub2, epub3) and audiobooks distributed through Bookbeat and kirja.fi. Digital formats offer ongoing revenue through expanded distribution.
3. International Rights Licensing: Bonnier Rights handles international licensing of translation rights for Tammi authors. Finnish authors' works are sold to publishers in dozens of countries.
4. Licensing and Film Rights: Film and TV rights are sold through Bonnier Rights. Max Seeck's Merkitty has a TV series in development; SenLinYu's Alchemised film rights sold for a seven-figure sum.

Pricing tiers

Go-to-market motion2 records

Distribution channels5 records

Marketing channels5 records

Core offering

Tammi is a Finnish book publisher that acquires manuscripts from authors and publishes them in multiple formats (hardcover, paperback, softcover, e-book, audiobook) across fiction, non-fiction, and children's and youth literature. The company distributes books through its own Kirja.fi online and physical bookstore, the Bookbeat digital platform, and Finland's retail bookstore network. It also licenses international translation rights and film/TV rights for its authors through Bonnier Rights.

Product overview

TAMMI is a Finnish book publishing house founded in 1943, one of Finland's largest publishers, and the market leader in children's and juvenile literature. It is part of Werner Söderström Osakeyhtiö (WSOY), a subsidiary of Bonnier Books. TAMMI publishes Finnish and translated fiction (novels, thrillers, crime, historical fiction), non-fiction (biographies, memoirs, science, self-help), and children's/youth literature. Key product lines include the Supermarsu children's series (adapted to film and theater), the Yökoulu easy-reader series, the Milo and Daniel Kuisma thriller series by Max Seeck, and the Kaksoismaailmat and Varjopäivä YA trilogies by Siri Kolu. The company distributes books in physical (hardcover, paperback, pokkari), e-book (epub2, epub3, enhanced e-books), and audiobook formats. Supporting services include the Kirja.fi online retail store and the Tammi Kuvapankki media bank.

Differentiator

Problem solved

Functional benefit

Products and services

• Kotimainen kaunokirjallisuus (Domestic Fiction) Publisher of Finnish-language fiction including novels, thrillers, crime fiction, historical fiction, and contemporary literary fiction for adult readers.
• Suomennettu kaunokirjallisuus (Translated Fiction) Publisher of translated fiction from international authors including Lars Kepler, SenLinYu, Liz Moore, Sara Stridsberg, and Elsie Silver, producing Finnish translations of bestselling international works.
• Tietokirjallisuus (Non-fiction) Publisher of non-fiction works including biographies, memoirs, society and history books, well-being and self-help, science and nature books.
• Lasten- ja nuortenkirjallisuus (Children's and Youth Literature) Finland's leading children's and youth book program, publishing picture books, easy readers, middle-grade fiction, YA novels, and illustrated books.
• Supermarsu Series Children's book series by Paula Noronen featuring the superhero character Emilia-Supermarsu. Multiple books adapted to theater and film, with the third movie released Christmas 2025. Also available in easy-reading versions.
• SELKEE! Easy Reading Series Easy-reading book series for readers with learning or reading difficulties, with the SELKEE! seal of approval. Includes adapted versions such as Supermarsu ja valheiden vangit and Hohtavat in easy Finnish.
• Max Seeck Thriller Series (Milo and Daniel Kuisma) Thriller series by Max Seeck featuring the Milo Perho (art gallerist) and Daniel Kuisma (defense forces specialist) characters. Includes NYT bestseller Uskollinen lukija and Lasiavain Award winner Kauna. Rights sold to dozens of countries; TV series adaptation planned.
• Kirja.fi Online Store Online retail platform for purchasing Tammi books including physical books, e-books (epub2/epub3), and audiobooks. Integrated with Bookbeat for audio/e-book streaming.
• Tammi Kuvapankki (Media Bank) Digital media bank providing cover images and author photos for press and marketing use. Searchable by author name, title, or EAN code.

Quantifiable outcome

• Max Seeck's 'Uskollinen lukija' reached The New York Times bestseller list — first Finnish work since Mika Waltari's 'Sinuhe egyptiläinen'.
• +1 more outcomes

Named customers2 records

Segments3 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Partnerships

Seven partnerships are on record, tiered core and minor.

• Bonnier BookscoreStrategic or Co-development PartnerTammi is part of Bonnier Books, which has publishing houses in the UK, Germany, Sweden, Norway, Poland, and Finland. The parent company provides shared services, international reach, and strategic direction.
• Bonnier RightscoreChannel Partner/ Reseller/ DistributorBonnier Rights is the literary agency that sells Tammi authors' translation rights internationally. It represents selected authors and illustrators from Werner Söderström Ltd. They handle both translation rights and film/TV rights on behalf of selected authors.
• BookbeatcoreChannel Partner/ Reseller/ DistributorBookbeat is the primary digital platform for Tammi's e-books and audiobooks. Books are available for individual purchase and streaming on the Bookbeat platform.
• Kirja.ficoreChannel Partner/ Reseller/ DistributorKirja.fi is Tammi's integrated online bookstore and physical retail location at Lönnrotinkatu 18, Helsinki. It serves as the primary direct-to-consumer sales channel for Tammi books.
• Werner Söderström Osakeyhtiö (WSOY)coreStrategic or Co-development PartnerTammi is part of Werner Söderström Osakeyhtiö, which also includes WSOY, Johnny Kniga, Readme.fi, Kosmos, Bazar, Docendo, and Crime Time publishing houses. CEO Timo Julkunen leads the group.
• Bloomsbury PublishingminorGTM or Marketing PartnerPartnership for Harry Potter Book Day (October 9th). Bloomsbury provides event materials, resources, and branding for the annual reading event that Tammi promotes in Finland.
• J.K. Rowling / Warner Bros. / BloomsburyminorGTM or Marketing PartnerTammi publishes Harry Potter books in Finnish and coordinates the annual Harry Potter Book Day in Finland, working with international partners.

Scale indicators7 records

Recent moves6 records

Expansion highlights5 records

Direct peers

• Høst & Søn: Danish publisher with a strong translated fiction and children's literature profile. Comparable in catalog breadth and use of Nordic rights networks, often competing for the same international author rights.
• Otava: One of Finland's largest trade book publishers, publishing Finnish and translated fiction, non-fiction, and children's/YA titles. Direct competitor across essentially every genre Tammi operates in within the Finnish market.
• WSOY (Werner Söderström): Tammi's sister imprint under the same Werner Söderström Osakeyhtiö (WSOY) parent entity, also publishing Finnish-language fiction, non-fiction, and translated works. Closely comparable in catalog mix and target audience within Finland.
• Schildts & Söderströms: Another established Finnish trade publisher covering Finnish and translated fiction, non-fiction, and children's literature, with a bilingual Finnish-Swedish editorial tradition. Closely comparable mid-sized competitor in the Finnish market.

Broad incumbents

• Bloomsbury Publishing: UK-based publisher with major children's/YA franchise catalog including Harry Potter (Tammi's Finnish Harry Potter partner). Comparable for cross-border franchise management, illustrated editions, and YA crossover successes.
• Gyldendal Norsk Forlag: Norway's leading literary publisher with strong children's/YA catalog and Nordic bestseller track record. Comparable as a Nordic general trade publisher competing for the same international rights deals via agencies.
• Aschehoug: Major Norwegian publisher with deep fiction, non-fiction, and children's catalogs. Comparable Nordic trade publisher often licensing and producing award-winning Nordic crime fiction similar to Tammi's Max Seeck line.
• Albert Bonniers Förlag: Sweden's leading general trade publisher and sister imprint within the Bonnier Books group. Comparable scale and genre mix to Tammi but in the larger Swedish-language market, with shared Bonnier Rights international distribution.
• Tammi's parent siblings: Johnny Kniga, Bazar, Docendo, Crime Time, Readme.fi, Kosmos: Sibling imprints under WSOY that share resources, distribution, and Bonnier Rights international channel. Comparable publishers within the same parent group, often overlapping in genre and authors.

Emerging players

• Storytel: Major Nordic audiobook/e-book streaming platform competing in the same digital audiobook space where Tammi distributes via Bookbeat. Relevant as a digital distribution channel that affects audiobook pricing and reach.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat5 records

Key risks5 records

Key highlights6 records

Customer concentration

• Xx.com/tammikirjat
• Facebookfacebook.com/Tammikirjat

Revenue estimate

Valuation estimate

Number of profiles

Profiles10 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 TAMMI