diff --git a/core/frontend/sass/modules/_cards.scss b/core/frontend/sass/modules/_cards.scss
index e102471..fb265f5 100644
--- a/core/frontend/sass/modules/_cards.scss
+++ b/core/frontend/sass/modules/_cards.scss
@@ -76,6 +76,9 @@
 
 .project-author {
     color: $color-light-text;
+    .project-featuring {
+        font-size: 0.875em;
+    }
 }
 
 .project-author--block {
diff --git a/core/migrations/0011_add_cooperation_field_to_site.py b/core/migrations/0011_add_cooperation_field_to_site.py
new file mode 100644
index 0000000..89b10cd
--- /dev/null
+++ b/core/migrations/0011_add_cooperation_field_to_site.py
@@ -0,0 +1,27 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.11.7 on 2018-05-04 09:19
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('core', '0010_wagtailsitepage_screenshot'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='wagtailsitepage',
+            name='in_cooperation_with',
+            field=models.ForeignKey(
+                blank=True,
+                null=True,
+                on_delete=django.db.models.deletion.SET_NULL,
+                related_name='+',
+                to='core.WagtailCompanyPage'
+            ),
+        ),
+    ]
diff --git a/core/models.py b/core/models.py
old mode 100644
new mode 100755
index c8e1e96..60ef492
--- a/core/models.py
+++ b/core/models.py
@@ -6,7 +6,7 @@
 from django.core.exceptions import ObjectDoesNotExist
 from django.core.paginator import EmptyPage, PageNotAnInteger, Paginator
 from django.db import models
-from django.db.models import Count
+from django.db.models import Case, Count, Q, Value, When
 from django.utils.encoding import python_2_unicode_compatible
 from django.utils.html import mark_safe
 from modelcluster.fields import ParentalKey
@@ -244,13 +244,15 @@ class WagtailCompanyPage(WagtailPage):
     parent_types = ['core.HomePage']
     subpage_types = ['core.WagtailSitePage']
 
+    SITES_ORDERING_ALPHABETICAL = 'alphabetical'
     SITES_ORDERING_CREATED = 'created'
+    SITES_ORDERING_PATH = 'path'
     SITES_ORDERING = {
-        'path': {
+        SITES_ORDERING_PATH: {
             'name': 'Path (i.e. manual)',
             'ordering': ['-path'],
         },
-        'alphabetical': {
+        SITES_ORDERING_ALPHABETICAL: {
             'name': 'Alphabetical',
             'ordering': ['title'],
         },
@@ -341,12 +343,32 @@ def og_image(self):
         return image
 
     def children(self):
-        ordering = self.SITES_ORDERING[self.sites_ordering]['ordering']
-        return WagtailSitePage.objects.live().descendant_of(self).order_by(*ordering)
+        user_ordering = self.SITES_ORDERING[self.sites_ordering]['ordering']
+        pages = WagtailSitePage.objects.live().filter(Q(path__startswith=self.path) | Q(in_cooperation_with=self))
+
+        # When ordering by `path`, the collaborations would either all be listed first or last
+        # depending on whether the collaborator(s) page(s) was created before or after this page.
+        # Adding an overwrite here so collaborations always appear last.
+        if self.sites_ordering == self.SITES_ORDERING_PATH:
+            pages = pages.annotate(
+                is_own=Case(
+                    When(path__startswith=self.path, then=Value(True)),
+                    default_value=Value(False),
+                    output_field=models.BooleanField(),
+                )
+            ).order_by('is_own', *user_ordering)
+
+        # When ordering alphabetically or by creation date,
+        # own sites and collaboration sites will be sorted together.
+        else:
+            pages = pages.order_by(*user_ordering)
+
+        return pages
 
     def get_context(self, request, *args, **kwargs):
         # Get pages
         pages = self.children()
+
         # Pagination
         page = request.GET.get('page')
         paginator = Paginator(pages, 12)  # Show 12 pages per page
@@ -405,6 +427,14 @@ class WagtailSitePage(WagtailPage):
         help_text='The URL of your site, something like "https://www.springload.co.nz"',
     )
 
+    in_cooperation_with = models.ForeignKey(
+        'core.WagtailCompanyPage',
+        null=True,
+        blank=True,
+        on_delete=models.SET_NULL,
+        related_name='+',
+    )
+
     search_fields = Page.search_fields + [
         index.SearchField('site_url'),
         index.SearchField('body_text')
diff --git a/core/panels.py b/core/panels.py
index a9364d8..d3a4208 100644
--- a/core/panels.py
+++ b/core/panels.py
@@ -28,6 +28,7 @@
     ImageChooserPanel('site_screenshot'),
     FieldPanel('body', classname="full"),
     FieldPanel('tags'),
+    FieldPanel('in_cooperation_with'),
 ]
 
 WAGTAIL_COMPANY_PAGE_CONTENT_PANELS = HOME_PAGE_CONTENT_PANELS + [
diff --git a/core/templates/core/includes/sites.html b/core/templates/core/includes/sites.html
index 98a9ba3..6798126 100644
--- a/core/templates/core/includes/sites.html
+++ b/core/templates/core/includes/sites.html
@@ -29,7 +29,17 @@ <h4 class="project-title">
                 {{ page.title }}
             </h4>
             <p class="project-author">
-                {{ page.parent.title|default:"A Wagtail developer"  }}
+                <a href="{{ page.parent.url }}" title="View the company page of {{ page.parent.title|default:"A Wagtail developer" }}">
+                    {{ page.parent.title|default:"A Wagtail developer"  }}
+                </a>
+                {% if page.in_cooperation_with %}
+                    <span class="project-featuring">
+                        &mdash; in cooperation with
+                        <a href="{{ page.in_cooperation_with.url }}">
+                            {{ page.in_cooperation_with.title }}
+                        </a>
+                    </span>
+                {% endif %}
             </p>
         </div>
     {% endfor %}
diff --git a/core/templates/core/wagtail_site_page.html b/core/templates/core/wagtail_site_page.html
index fa36c2d..ca8d696 100644
--- a/core/templates/core/wagtail_site_page.html
+++ b/core/templates/core/wagtail_site_page.html
@@ -25,6 +25,12 @@ <h2>{{ self.title }}</h2>
                         Made by <a href="{{self.parent.url}}" title="">
                             {{ self.parent.title }}
                         </a>
+                        {% if self.in_cooperation_with %}
+                        <span class="project-featuring">&mdash; in cooperation with <a href="{{self.in_cooperation_with.url}}" title="">
+                            {{ self.in_cooperation_with.title }}
+                        </a>
+                        </span>
+                        {% endif %}
                     </p>
                     {{ self.body|richtext }}