diff --git a/src/DigitalData.Swagger.MockAPI/DigitalData.Swagger.MockAPI.csproj b/src/DigitalData.Swagger.MockAPI/DigitalData.Swagger.MockAPI.csproj
index af1efcb..898be1c 100644
--- a/src/DigitalData.Swagger.MockAPI/DigitalData.Swagger.MockAPI.csproj
+++ b/src/DigitalData.Swagger.MockAPI/DigitalData.Swagger.MockAPI.csproj
@@ -7,6 +7,7 @@
   </PropertyGroup>
 
   <ItemGroup>
+    <PackageReference Include="Microsoft.AspNetCore.OData" Version="9.1.3" />
     <PackageReference Include="Swashbuckle.AspNetCore" Version="6.4.0" />
   </ItemGroup>
 
diff --git a/src/DigitalData.Swagger.MockAPI/Entities/Company.cs b/src/DigitalData.Swagger.MockAPI/Entities/Company.cs
new file mode 100644
index 0000000..f48d3ca
--- /dev/null
+++ b/src/DigitalData.Swagger.MockAPI/Entities/Company.cs
@@ -0,0 +1,9 @@
+namespace DigitalData.Swagger.MockAPI.Dtos;
+
+public class Company
+{
+    public int ID { get; set; }
+    public string? Name { get; set; }
+    public int Size { get; set; }
+    public List<Product>? Products { get; set; }
+}
\ No newline at end of file
diff --git a/src/DigitalData.Swagger.MockAPI/Entities/Product.cs b/src/DigitalData.Swagger.MockAPI/Entities/Product.cs
new file mode 100644
index 0000000..9a5f642
--- /dev/null
+++ b/src/DigitalData.Swagger.MockAPI/Entities/Product.cs
@@ -0,0 +1,9 @@
+namespace DigitalData.Swagger.MockAPI.Dtos;
+
+public class Product
+{
+    public int ID { get; set; }
+    public int CompanyID { get; set; }
+    public string? Name { get; set; }
+    public decimal Price { get; set; }
+}
\ No newline at end of file
diff --git a/src/DigitalData.Swagger.MockAPI/Repos/CompanyRepo.cs b/src/DigitalData.Swagger.MockAPI/Repos/CompanyRepo.cs
new file mode 100644
index 0000000..4929303
--- /dev/null
+++ b/src/DigitalData.Swagger.MockAPI/Repos/CompanyRepo.cs
@@ -0,0 +1,95 @@
+using DigitalData.Swagger.MockAPI.Dtos;
+using System;
+
+namespace DigitalData.Swagger.MockAPI.Repos;
+public class CompanyRepo : ICompanyRepo
+{
+    private readonly Lazy<List<Company>> _lazyCompanies = new(() => new()
+    {
+        new()
+        {
+            ID = 1,
+            Name = "TechCorp",
+            Size = 500,
+            Products = new List<Product>
+            {
+                new() { ID = 1, CompanyID = 1, Name = "Laptop X1", Price = 1200.99m },
+                new() { ID = 2, CompanyID = 1, Name = "Smartphone S2", Price = 799.49m }
+            }
+        },
+        new Company
+        {
+            ID = 2,
+            Name = "AutoWorks",
+            Size = 300,
+            Products = new List<Product>
+            {
+                new Product { ID = 3, CompanyID = 2, Name = "Electric Car E1", Price = 35000m },
+                new() { ID = 4, CompanyID = 2, Name = "Hybrid SUV H2", Price = 42000m }
+            }
+        },
+        new Company
+        {
+            ID = 3,
+            Name = "MediHealth",
+            Size = 200,
+            Products = new List<Product>
+            {
+                new() { ID = 5, CompanyID = 3, Name = "Vitamin Pack V10", Price = 19.99m },
+                new() { ID = 6, CompanyID = 3, Name = "Protein Shake P5", Price = 25.49m }
+            }
+        },
+        new Company
+        {
+            ID = 4,
+            Name = "HomeStyle",
+            Size = 150,
+            Products = new List<Product>
+            {
+                new() { ID = 7, CompanyID = 4, Name = "Smart Blender B3", Price = 89.99m },
+                new() { ID = 8, CompanyID = 4, Name = "Air Purifier A1", Price = 149.99m }
+            }
+        },
+        new Company
+        {
+            ID = 5,
+            Name = "GadgetZone",
+            Size = 400,
+            Products = new List<Product>
+            {
+                new() { ID = 9, CompanyID = 5, Name = "Wireless Earbuds W1", Price = 99.99m },
+                new() { ID = 10, CompanyID = 5, Name = "Smart Watch G5", Price = 199.99m }
+            }
+        }
+    });
+
+    private List<Company> _companies => _lazyCompanies.Value;
+
+    public IQueryable<Company> GetAll()
+    {
+        return _companies.AsQueryable();
+    }
+
+    public IQueryable<Company> GetById(int id)
+    {
+        return _companies
+            .AsQueryable()
+            .Where(c => c.ID == id);
+    }
+
+    public void Create(Company company)
+    {
+        _companies.Add(company);
+    }
+
+    public void Update(Company company)
+    {
+        var i = _companies.FindIndex(c => c.ID == company.ID);
+        _companies[i] = company;
+    }
+
+    public void Delete(Company company)
+    {
+        _companies.RemoveAll(c => c.ID == company.ID);
+    }
+}
\ No newline at end of file
diff --git a/src/DigitalData.Swagger.MockAPI/Repos/ICompanyRepo.cs b/src/DigitalData.Swagger.MockAPI/Repos/ICompanyRepo.cs
new file mode 100644
index 0000000..47808a3
--- /dev/null
+++ b/src/DigitalData.Swagger.MockAPI/Repos/ICompanyRepo.cs
@@ -0,0 +1,11 @@
+using DigitalData.Swagger.MockAPI.Dtos;
+namespace DigitalData.Swagger.MockAPI.Repos;
+
+public interface ICompanyRepo
+{
+    public IQueryable<Company> GetAll();
+    public IQueryable<Company> GetById(int id);
+    public void Create(Company company);
+    public void Update(Company company);
+    public void Delete(Company company);
+}
\ No newline at end of file