Regional School Unit 21

What Regional School Unit 21 does

Regional School Unit 21 (RSU 21) is a public K-12 school district organized under Maine state law, serving the communities of Arundel, Kennebunk, and Kennebunkport in southern Maine (York County). The district operates six schools spanning PreK through grade 12: Kennebunk Elementary School, Kennebunkport Consolidated School, Mildred L. Day School, Sea Road School, Middle School of the Kennebunks, and Kennebunk High School. Academic offerings include the IB Diploma Programme, AP classes, a STEM Scholar Program, special education services, gifted and talented programming (GATES), and multilingual learner support. Students also access career-technical education through partnerships with three regional technical centers.

The district's technology stack is composed entirely of commercial off-the-shelf edtech platforms rather than proprietary systems: PowerSchool for student information, ADP for payroll/HR, Frontline for absence management, Cornerstone for professional development, BusRight for GPS-based transportation tracking, NWEA/AIMSWeb/Dial 4 for assessment, Google Apps for Education on a 1:1 Chromebook program, and Linq Connect for nutrition services. Supporting operations include a 54-person transportation department running 2,000+ daily route miles, a free school meals program for 2025-2026, and facility-safety compliance work (PFAS, radon, mold testing). NEASC accreditation covers Kennebunk High School.

RSU 21 is a government entity — not a commercially operating company — with no equity holders, no public revenue disclosure, and no commercial revenue model. Funding flows from local property taxes (subject to voter referendum), Maine state education funding, and federal grants (including ESSERF/ARP). Go-to-market is non-existent in the commercial sense; enrollment is residency-gated and handled through a centralized registration process. The district is governed by an elected School Board and is led by Superintendent Dr. Martin Grimm, who began a three-year contract on September 1, 2025.

Name

Regional School Unit 21

Legal name

Regional School Unit 21

Website

https://rsu21.net

Company type

Private

Founded year

2009

Operating status

Operating

Headcount range

251–500 employees

Short description

RSU 21 is a public K-12 school district in southern Maine operating six schools across Arundel, Kennebunk, and Kennebunkport, serving PreK-12 students with programs including IB, AP, special education, and career-technical education, funded by property taxes, state aid, and federal grants.

Ownership category

akta.pro rank

Product category

K-12 Public Education

NAICS

Elementary and Secondary Schools (6111), Elementary and Secondary Schools (611110)

SIC

Services-Educational Services (8200)

akta.pro primary industry

Public School Districts (K–12) (EDADABAA)

akta.pro secondary industry

District Student Services Administration (Special Ed, Counseling, Health) (EDADABAJ)

Keywords

• K-12 public education
• Special education services
• School transportation services
• School nutrition programs
• Gifted talented education

Headquarters

HQ city

Maine

HQ country

United States

HQ region

North America

Offices8 records

Markets served

GTM type

B2C

Offering type

Services

Cost components

Personnel, Operations, Technology or R&D, Infrastructure

Revenue model

1. Property Tax Revenue: Local property taxes from the towns of Arundel, Kennebunk, and Kennebunkport fund a significant portion of the school district's operating budget. The budget is approved through a voter referendum process.
2. State Education Funding: Maine state funding for public education, distributed through the Maine Department of Education
3. Federal Grants: ESSERF grants, ARP funding, and other federal education funding programs
4. School Nutrition Program: National School Lunch Program providing meals to students; meals provided at no cost in 2025-2026 school year

Pricing tiers

Go-to-market motion1 record

Distribution channels3 records

Marketing channels6 records

Core offering

Regional School Unit 21 is a public school district that operates six schools across three Maine communities (Arundel, Kennebunk, Kennebunkport), delivering PreK-12 education including special education, gifted and talented, and multilingual learner programs. The district also provides supporting services such as student transportation, food and nutrition, athletics, and a 1:1 Chromebook program.

Product overview

Regional School Unit 21 is a public school district serving the communities of Arundel, Kennebunk, and Kennebunkport in Maine. The district operates six schools: Kennebunk High School (grades 9-12), Middle School of the Kennebunks (grades 6-8), and four elementary schools (Kennebunk Elementary School, Sea Road School, Mildred L. Day School, and Kennebunkport Consolidated School serving grades K-5). The district offers a comprehensive educational portfolio including a PreK program, Special Education services (Resource Room, RISE, LIFT, CSSP programs), GATES Gifted and Talented program, and Multilingual Learners support. Supporting services include Food and Nutrition Services (meals at no cost for 2025-2026), Transportation Services (with BusRight GPS tracking), and Athletics programs. The district utilizes technology platforms including PowerSchool for student information, ADP/Frontline for HR/payroll, Cornerstone for professional development, and NWEA/AIMSWeb for assessment. Kennebunk High School offers advanced programs including IB Diploma Programme, AP classes, STEM Scholar Program, and access to regional technical education centers.

Differentiator

Problem solved

Functional benefit

Products and services

• Kennebunk High School

Quantifiable outcome

• Free school meals provided to all students 2025-2026

Named customers3 records

Segments3 records

Ideal customer profiles1 record

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Integration13 records

Feature3 records

Partnerships

Ten partnerships are on record, tiered core and minor.

• New England School Development Council (NESDEC)coreStrategic or Co-development Partner · 1 January 2025NESDEC assisted RSU 21 in the superintendent search process in 2025, conducting community surveys, hosting focus groups, and providing consultation for the selection of Dr. Martin Grimm as superintendent from 15 applicants.
• Portland Arts and Technology High SchoolminorStrategic or Co-development PartnerTechnical education partnership allowing KHS students to access career technical programs
• Sanford Regional Technical CenterminorStrategic or Co-development PartnerTechnical education partnership for career technical programs
• Biddeford Regional Center of TechnologyminorStrategic or Co-development PartnerTechnical education partnership for career technical programs
• George Mason UniversityminorStrategic or Co-development PartnerPartnership for athletic trainers for middle school athletes and Dr. Grimm served as adjunct professor teaching graduate courses in educational leadership
• Education Foundation of the Kennebunks and ArundelminorStrategic or Co-development PartnerNonprofit foundation supporting educational programs and fundraising for district schools
• Washington CommandersminorStrategic or Co-development PartnerPartnership to create the first girls' flag football league in Virginia (Dr. Grimm's prior role in Prince William County)
• Maine Educational Association (MEA)coreStrategic or Co-development PartnerPartnership through MEA Benefits Trust for health insurance plans offered to district employees - five Anthem BlueCross BlueShield plan options
• Maine Public Employees Retirement System (MainePERS)coreStrategic or Co-development PartnerPension plans for employees working 25+ hours per week; teachers required to enroll in Teachers program, non-certified staff eligible for PLD program
• Southern Maine Regional Service CenterminorStrategic or Co-development PartnerRegional service center providing shared services to southern Maine school districts

Scale indicators5 records

Recent moves5 records

Expansion highlights4 records

Emerging players

• Stride Inc. (formerly K12 Inc.): Public company providing online K-12 education and tutoring services. Comparable as a K-12 education provider, though delivery model (online vs. physical schools) and funding source (tuition/contracts vs. tax-funded) differ materially from RSU 21's traditional district model.

Direct peers

• Portland Public Schools: Largest public K-12 district in Maine, serving Portland and surrounding communities. Directly comparable to RSU 21 as a Maine public school district operating multiple schools funded by property taxes, state aid, and federal grants under the same Maine DOE regulatory framework.
• MSAD 35 (Marshwood): Maine School Administrative District serving Eliot, South Berwick, North Berwick, and Berwick. Comparable regional Maine public school district operating multiple schools under the same state funding framework as RSU 21.
• Biddeford School Department: Neighboring Maine public K-12 district that operates the Biddeford Regional Center of Technology, a partner site for RSU 21 students. Comparable public K-12 structure, scale, and southern Maine regional context.
• York School Department: Nearby York County, Maine public K-12 district of similar scale. Comparable coastal-Maine public school district serving multiple schools under the same state funding and regulatory framework as RSU 21.
• Sanford School Department: Neighboring Maine public school district that operates regional technical center partnerships used by RSU 21 students. Directly comparable as a public K-12 district in York County, Maine with similar funding mechanics and regulatory environment.
• Wells-Ogunquit Community School District: Southern Maine public K-12 district serving two towns with a comparable consolidated-district structure. Directly comparable as a multi-town public school district under the same Maine DOE oversight.

Broad incumbents

• KIPP Foundation: National network of public charter K-12 schools serving predominantly underserved communities. Comparable as a multi-school K-12 operator focused on college-prep outcomes, though operating under a charter rather than traditional district governance model.
• National Heritage Academies: Charter management organization operating 90+ K-12 public charter schools across the U.S. Comparable as a multi-school K-12 operator, though operates under charter contracts rather than traditional public school district governance like RSU 21.
• Success Academy Charter Schools: New York-based charter K-12 network known for rigorous academics and high test scores. Comparable to RSU 21's college-prep focus (IB, AP, STEM), but operates as a charter network rather than a traditional public school district.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights7 records

Customer concentration

• YouTubevimeo.com/showcase/11574383
• Facebookfacebook.com/rsu21
• Xx.com/rsu21

Revenue estimate

Valuation estimate

Number of profiles

Profiles9 records

Subsidiaries6 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 Regional School Unit 21