The Overseas School of Colombo

What The Overseas School of Colombo does

The Overseas School of Colombo (OSC) is a nonprofit independent international school founded in 1957 in Battaramulla, Sri Lanka, operating as a guarantee company governed by a nine-member parent-elected board. It is the only IB World School in Sri Lanka fully authorized to offer all three International Baccalaureate programmes — Primary Years (Early Years through Grade 5), Middle Years (Grades 6-10), and Diploma Programme (Grades 11-12) — and holds dual accreditation with the Middle States Association (MSA, US-based) and the Council of International Schools (CIS, Europe-based). OSC serves approximately 393 students from over 40 nationalities, primarily children of diplomatic missions, UN staff, NGO workers, and corporate sector professionals stationed in Sri Lanka, with a 17% local Sri Lankan family cohort. The school employs 110 staff including 63 experienced international educators, maintaining a 1:5 teacher-to-student ratio overall (7:1 in Primary).

OSC's core academic product is the IB continuum, delivered through the ManageBac learning management system for Secondary and the SeeSaw platform for Primary, supplemented by a Bring Your Own Laptop (BYOL) program from Grade 6 upward. Enrichment products include Summer Camp, the Duke of Edinburgh International Award, the CAS (Creativity, Activity, Service) programme, the Week Without Walls experiential program, an Advisory social-emotional learning curriculum, 40+ after-school activities, and 12 sports teams. Community-facing partnerships include Room to Read literacy support and long-term service ties with primary schools in Hambantota and Galle following the 2004 tsunami.

Revenue is generated primarily through annual tuition fees paid in USD, LKR, or other convertible currencies, with a US$250 non-refundable application fee and a US$250 re-enrolment fee. Admissions operate direct-to-consumer through campus tours, Open Days, the OpenApply online portal, and sectional principal reviews. Any surplus is reinvested into educational quality under the nonprofit structure. The school has achieved a 100% IB Diploma pass rate and an 82% DP pass rate with 30.5 average points, with $16.4M+ in scholarships awarded to the Class of 2025.

Name

The Overseas School of Colombo

Legal name

The Overseas School of Colombo (Guarantee) Limited

Website

https://osc.lk

Company type

Private

Founded year

1957

Operating status

Operating

Headcount range

101–250 employees

Short description

The Overseas School of Colombo is a nonprofit international school in Sri Lanka founded in 1957, offering the only full International Baccalaureate continuum (PYP, MYP, DP) in the country to roughly 393 students from 40+ nationalities.

Ownership category

akta.pro rank

Product category

K-12 International Education

NAICS

Elementary and Secondary Schools (6111)

SIC

Services-Educational Services (8200)

akta.pro primary industry

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

Keywords

• International education
• International Baccalaureate
• K-12 schooling
• Primary years programme
• Diploma programme

Headquarters

HQ city

Battaramulla

HQ country

Sri Lanka

HQ region

Asia

Offices1 record

Markets served

GTM type

B2C

Offering type

Services

Cost components

Personnel, Operations, Infrastructure, Others

Revenue model

1. Tuition Fees: Primary revenue from tuition fees for students enrolled in Early Years through Grade 12 IB programs. Fee structures available for 2025-26 and 2026-27 academic years. Payment accepted in USD, LKR, or other convertible currencies.

Pricing tiers

Go-to-market motion1 record

Distribution channels3 records

Marketing channels7 records

Core offering

The Overseas School of Colombo delivers International Baccalaureate education to students from Early Years through Grade 12. It offers the IB Primary Years Programme (PYP), Middle Years Programme (MYP), and Diploma Programme (DP) on a single campus in Colombo, Sri Lanka, providing continuous international curriculum in English for children of expatriate and local families.

Product overview

The Overseas School of Colombo is an IB World School offering a complete International Baccalaureate continuum from Early Years through Grade 12. The core educational products are the three IB programmes: Primary Years Programme (PYP) for ages 3-11, Middle Years Programme (MYP) for Grades 6-10, and Diploma Programme (DP) for Grades 11-12. Supporting the academic core, OSC provides enrichment modules including Summer Camp, After School Activities, Advisory Programme, CAS Programme, Week Without Walls experiential trips, and the Duke of Edinburgh International Award. Technology-enhanced learning is supported through the BYOL (Bring Your Own Laptop) program. The school also offers a Financial Assistance Programme for families in need. All programmes are delivered via the ManageBac LMS (Secondary) and Seesaw platform (Primary), with OpenApply for admissions.

Differentiator

Problem solved

Functional benefit

Products and services

• Primary Years Programme (PYP)

Quantifiable outcome

• 100% pass rate in IB Diploma Programme
• +4 more outcomes

Named customers4 records

Segments2 records

Ideal customer profiles1 record

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Integration7 records

Feature3 records

Partnerships

Ten partnerships are on record, tiered core, major and minor.

• International Baccalaureate Organization (IBO)coreStrategic or Co-development PartnerOSC is fully authorized by IBO to offer three IB programmes: Primary Years Programme (pre-K through Grade 5), Middle Years Programme (Grades 6-10), and Diploma Programme (Grades 11-12). The IB authorization requires regular periodic assessments by external educational professionals.
• Council of International Schools (CIS)coreStrategic or Co-development PartnerOSC is fully accredited by CIS, a Europe-based accrediting association. Accreditation ensures standards are uniform with expectations of colleges, universities, and other international schools worldwide.
• Middle States Association of Colleges and Schools (MSA)coreStrategic or Co-development PartnerOSC is fully accredited by MSA-CESS, a US-based accrediting association. Being an accredited school allows automatic acceptance of OSC reports and transcripts as they meet mutually agreed high standards.
• South Asian Inter-School Association (SAISA)majorStrategic or Co-development PartnerOSC is a full member of SAISA, enabling participation in regional sports tournaments and athletic competitions. OSC has hosted SAISA tournaments including a first-ever SAISA Athletics event.
• Near East South Asia Council of Overseas Schools (NESA)majorStrategic or Co-development PartnerOSC is a member of NESA, a regional organization of international schools providing professional development, conferences, and networking opportunities for educators.
• Duke of Edinburgh's International AwardcoreStrategic or Co-development PartnerOSC is a licensed award center for the Duke of Edinburgh International Award, offering Bronze, Silver, and Gold awards. The program fits closely with IB CAS activities and was introduced in the 2018-19 school year.
• ManageBaccoreTechnology or IntegrationPrimary learning management system used daily in Secondary School for lesson plans, unit plans, assessments, grading, and attendance. Also used for CAS reflection and activity management.
• SeeSawcoreTechnology or IntegrationLearning platform used in Primary School for student learning activities and portfolio building.
• Room to ReadminorStrategic or Co-development PartnerOSC's Room to Read program supports literacy and education initiatives, part of school's community outreach and service learning activities.
• Hambantota and Galle Primary SchoolsminorStrategic or Co-development PartnerLong-term community partnerships with primary schools in Hambantota and Galle regions, initiated following the 2004 tsunami. DP students participate in service activities including medical clinics and educational support.

Scale indicators10 records

Recent moves6 records

Expansion highlights5 records

Broad incumbents

• Singapore American School: One of the largest and most established international schools in Asia, offering a comprehensive K–12 program to a predominantly American expat and corporate-family population. Functions as a regional incumbent benchmark for OSC on premium international K–12 delivery and university outcomes.
• Seoul International School: Established IB-continuum international school in Seoul serving expatriate and Korean returnee families. Comparable to OSC on international K–12 delivery and IB authorization, while operating at greater scale and serving a larger expat corporate base.
• International School Bangkok: One of Asia's oldest and largest international schools, offering comprehensive K–12 programming to a heavily expat and corporate-family population. Comparable to OSC on heritage and expat-anchored demand, though operating at significantly larger scale and tuition tier.
• United World College South East Asia: Large Singapore-based IB-continuum school serving a globally diverse student body across two campuses. Comparable to OSC as an established IB-focused international school, though at materially greater scale, providing a reference point for what a mature IB international brand can become.

Direct peers

• Jakarta Intercultural School: IB- and AP-offering international school in Indonesia with a comparable mix of diplomatic, multinational, and local affluent families. Closely matched to OSC on international community demographics, K–12 continuum, and tuition-tier positioning in a regional emerging market.
• Garden International School: Long-established IB World School in Kuala Lumpur serving an internationally diverse student population. Comparable to OSC on heritage (founded mid-20th century), IB continuum delivery, and reliance on expat and corporate-family demand in Southeast Asia.
• Bandung International School: IB World School in Indonesia of broadly similar scale, also serving an internationally mobile population with strong university-preparation outcomes. Directly comparable to OSC on curriculum model and student demographic profile in a regional context.
• International School Yangon: IB World School in Myanmar with a strongly international student body drawing on diplomatic and corporate families. Closely comparable to OSC on size tier, expat-driven enrollment, and single-campus emerging-market operating context.
• NIST International School: IB World School in Bangkok serving an internationally mobile student body across PYP, MYP, and DP. Directly comparable to OSC as a mid-sized international school whose student population is anchored by diplomatic, corporate, and expatriate families seeking globally portable credentials.
• International School of Phnom Penh: IB-continuum international school in Cambodia serving expatriate and diplomatic families. Comparable to OSC on operating in a regional emerging market, expat-anchored demand, and mid-sized premium international positioning.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat5 records

Key risks6 records

Key highlights6 records

Customer concentration

• YouTubeyoutube.com/@OSCEvents
• Facebookfacebook.com/theoverseasschoolofcolombo
• LinkedInlinkedin.com/company/the-overseas-school-of-colombo
• Instagraminstagram.com/osc_srilanka

Compliance9 records

Revenue estimate

Valuation estimate

Number of profiles

Funding overview

Funding rounds

Investors

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M&A

Investments

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Frequently asked questions about The Overseas School of Colombo