What The International School of Belgrade does

The International School of Belgrade (ISB) is a not-for-profit, non-proprietary international school founded in 1948 and operating two campuses in Belgrade, Serbia under the governance of a Board of Trustees. It is the only school in Belgrade authorized by the International Baccalaureate Organization to offer all three IB programs: the Primary Years Programme (Pre-K through Grade 5), the Middle Years Programme (Grades 6-10), and the Diploma Programme (Grades 11-12). ISB also holds NEASC accreditation, CIS membership, and authorization from the Ministry of Education of the Republic of Serbia. The school serves approximately 500 students from 47 nationalities, taught by 84 internationally qualified faculty from 19 nationalities, with an average class size of 15 and an overall teacher-student ratio of 1:8.

ISB's core product is the full IB continuum from ages 3 to 18, augmented by Chinese Mother Tongue and Foreign Language programs, English as an Additional Language support, learning support services, university counseling, and a Grade 9 full-tuition scholarship for local Serbian students. The technology stack is Google Workspace for Education plus the SEESAW learning journal, NWEA MAP assessments, Adobe Creative Cloud on BYOL high school laptops, and a tiered 1:1 device program (iPads for K-5, Chromebooks for 6-8, BYOL laptops for 9-12). ISB has developed in-house AI microapps used by teachers for instructional planning and curriculum integration, and participates in CEESA regional athletics and ISTA performing arts networks.

ISB's business model is tuition-driven with revenue concentrated in annual subscription-style fees across four grade bands ($10,320 for Pre-K, $23,630 for K-5, $25,455 for Grades 6-8, and $28,235 for Grades 9-12 in 2025/26). Recurring revenue is supplemented by optional auxiliary services (transportation at $3,500, EAL at $1,500, payment plan processing at $400) and one-time fees (application $500, registration $1,000, capital fees of €1,500 returning / €3,000 new). Go-to-market is direct-to-consumer: families inquire via the school website, schedule campus tours, and complete a direct admissions process, with strong reliance on word-of-mouth through embassies, multinational corporations, NGOs, and the expat community. As a not-for-profit, all surplus is reinvested into educational programs, with over 70% of the operating budget allocated to staffing.

Name

The International School of Belgrade

Legal name

The International School of Belgrade

Website

https://isb.rs

Company type

Private

Founded year

1948

Operating status

Operating

Headcount range

101–250 employees

Short description

The International School of Belgrade is a not-for-profit IB World School founded in 1948 serving approximately 500 students from 47 nationalities across two Belgrade campuses, offering the full IB continuum (PYP, MYP, DP) to expat, diplomatic, and local Serbian families.

Ownership category

akta.pro rank

Product category

K-12 International Baccalaureate Education

NAICS

Elementary and Secondary Schools (611110), Language Schools (61163)

SIC

Services-Educational Services (8200)

akta.pro primary industry

International/Global Curriculum Schools (IB, Cambridge, etc.) (EDAJABAG)

akta.pro secondary industries

World Languages Instruction (School-Delivered) (EDAJAFAJ), General Language Schools & Institutes (EDAMAFAA)

Keywords

• International baccalaureate education
• K-12 schooling
• Primary education
• Secondary education
• English-medium instruction

Headquarters

HQ city

Belgrade

HQ country

Serbia

HQ region

Europe

Offices3 records

Markets served

GTM type

B2C

Offering type

Services

Cost components

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

Revenue model

1. Tuition Fees: Annual tuition fees charged per student across four grade bands. Tuition is the primary revenue stream, with fees varying by grade level (Pre-K through Grade 12). Prices increase modestly year-over-year.
2. One-time Fees: One-time fees including application fee ($500), registration fee ($1,000), and capital fees (€1,500 for returning students, €3,000 for new students). These fees are charged at enrollment.
3. Auxiliary Services: Optional services including transportation ($3,500), EAL (English as an Additional Language) support ($1,500), and payment plan processing ($400).

Pricing tiers

Go-to-market motion1 record

Distribution channels3 records

Marketing channels3 records

Core offering

The International School of Belgrade delivers International Baccalaureate education across all three programmes — PYP (Pre-K to Grade 5), MYP (Grades 6–10), and Diploma Programme (Grades 11–12) — to approximately 500 students aged 3–18. Core instruction is delivered in English and supported by ancillary paid services such as English as an Additional Language (EAL), school bus transportation, learning support, Chinese mother tongue and foreign language classes, co-curricular activities, CEESA athletics, performing arts, and university counseling.

Product overview

The International School of Belgrade is an International Baccalaureate World School offering a comprehensive educational program through three IB programs: PYP (Pre-K through Grade 5), MYP (Grades 6-10), and DP (Grades 11-12). The school provides a integrated portfolio of educational services including specialized language programs (Chinese Mother Tongue and Foreign Language), co-curricular activities (50+ options), CEESA athletics, performing arts, learning support, EAL services, university counseling, and a scholarship program. The technology infrastructure includes Google Workspace for Education, SEESAW platform, NWEA MAP assessments, and a 1:1 device program with school-managed iPads in Primary School, Chromebooks in Middle School, and BYOL laptops in High School. The school has developed AI-powered microapps for instructional planning and curriculum integration, used within Professional Learning Communities.

Differentiator

Problem solved

Functional benefit

Quantifiable outcome

• Average class size of 15 students
• +2 more outcomes

Segments3 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Integration5 records

AI capability4 records

Feature1 record

Partnerships

Four partnerships are on record, tiered core and minor.

• International Baccalaureate Organization (IBO)coreStrategic or Co-development PartnerAuthorized IB World School offering all three IB programs (PYP, MYP, DP). This partnership provides the school's curriculum framework and international credentials recognized by universities worldwide.
• New England Association of Schools and Colleges (NEASC)coreStrategic or Co-development PartnerAccredited by NEASC, one of the most prestigious regional accrediting bodies in the United States, recognized internationally for educational quality standards.
• Council of International Schools (CIS)coreStrategic or Co-development PartnerMember of CIS, a global non-profit organization supporting international education through accreditation, professional development, and networking.
• Central and Eastern European Schools Association (CEESA)minorStrategic or Co-development PartnerMember of CEESA network of international schools in Central and Eastern Europe, participating in athletic competitions and collaborative academic programs.

Scale indicators8 records

Recent moves6 records

Expansion highlights5 records

Regional players

• International School of Prague: ISP is a leading IB World School serving the international community in Prague. Comparable to ISB in curriculum framework (IB continuum), target families, and CEESA membership, but operates in a more mature/developed market.
• International School of Bucharest: ISB Bucharest is an IB World School in another CEE capital serving the expat community. It is structurally comparable to ISB in terms of IB programs offered, customer base, and operational model, but operates in a different geographic market.
• American International School of Zagreb: AIS Zagreb is a long-established American/international school in another CEE capital serving expat and local families. Comparable to ISB in scale, IB offerings, and reliance on diplomatic and corporate community.
• American School of Warsaw: ASW is a major IB World School in a CEE capital serving expat families. Comparable to ISB in IB continuum offerings, tuition price band, and accreditation profile, though operating in a larger market.

Broad incumbents

• Vienna International School: VIS is a large, established IB international school serving UN and diplomatic families in Vienna. Comparable to ISB on IB continuum and diplomatic customer base, but at materially larger scale.

Direct peers

• British International School Belgrade: The British International School Belgrade is another premium international school in Belgrade serving the expat and diplomatic community. It directly competes with ISB for the same expatriate family segment in the city, though it follows the British curriculum rather than IB.
• Chartwell International School Belgrade: Chartwell International School is another English-medium international school in Belgrade serving diplomatic, corporate, and local families. It overlaps with ISB in target market and Belgrade geography.
• German International School Belgrade: The German School Belgrade serves international and bilingual families in Belgrade, offering a German-stream curriculum alongside international programs. It competes for the same limited pool of premium international school families in the city.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• Facebookfacebook.com/199581856778691
• LinkedInlinkedin.com/company/the-international-school-of-belgrade

Compliance3 records

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 The International School of Belgrade