diff --git a/lelcsc/core/forms.py b/lelcsc/core/forms.py
new file mode 100644
index 0000000..939765b
--- /dev/null
+++ b/lelcsc/core/forms.py
@@ -0,0 +1,17 @@
+from django import forms
+from django.utils.translation import gettext_lazy as _
+
+
+class AddStockForm(forms.Form):
+    part_number = forms.CharField(label=_("Component"))
+    properties = forms.JSONField(initial={}, label=_("Properties"), required=False)
+    quantity = forms.IntegerField(min_value=1, label=_("Quantity"))
+    original_quantity = forms.IntegerField(min_value=1, label=_("Original quantity"))
+    total_value = forms.DecimalField(
+        min_value=0, max_digits=8, decimal_places=2, label=_("Total value")
+    )
+    location = forms.CharField(label=_("Location"), widget=forms.Textarea)
+    owner = forms.CharField(label=_("Owner"))
+
+
+AddStockFormSet = forms.formset_factory(AddStockForm, extra=0)
diff --git a/lelcsc/core/signals.py b/lelcsc/core/signals.py
index 2764c3e..04e760a 100644
--- a/lelcsc/core/signals.py
+++ b/lelcsc/core/signals.py
@@ -1,3 +1,21 @@
-from django.dispatch import Signal
+from django.dispatch import Signal, receiver
+from django.urls import reverse
+from django.utils.translation import gettext as _
 
 populate_nav = Signal()
+
+
+@receiver(populate_nav, dispatch_uid="populate_nav_core")
+def populate_nav_core(sender, **kwargs):
+    request = sender
+
+    if not request.user.is_authenticated:
+        return []
+
+    return [
+        {
+            "is_active": request.resolver_match.url_name == "add_stock",
+            "link": reverse("add_stock"),
+            "text": _("Add stock"),
+        },
+    ]
diff --git a/lelcsc/core/static/core/add_stock.js b/lelcsc/core/static/core/add_stock.js
new file mode 100644
index 0000000..71e6de5
--- /dev/null
+++ b/lelcsc/core/static/core/add_stock.js
@@ -0,0 +1,71 @@
+let totalForms = Object.defineProperty({}, 'value', {
+    get() {
+        return +document.getElementById('id_form-TOTAL_FORMS').value;
+    },
+
+    set(value) {
+        document.getElementById('id_form-TOTAL_FORMS').value = value;
+    },
+
+    enumerable: false,
+    configurable: false,
+});
+
+const updateNames = (elem, i) => {
+    const replaceIndex = s => s.replaceAll('__prefix__', `${i}`);
+
+    if (elem.hasAttribute('for')) {
+        elem.htmlFor = replaceIndex(elem.htmlFor);
+    }
+
+    if (elem.hasAttribute('id')) {
+        elem.id = replaceIndex(elem.id);
+    }
+
+    if (elem.hasAttribute('name')) {
+        elem.name = replaceIndex(elem.name);
+    }
+
+    for (const child of elem.children) {
+        updateNames(child, i);
+    }
+};
+
+const autofillQuantity = i => {
+    const originalQuantity = document.getElementById(`id_form-${i}-original_quantity`);
+    const quantity = document.getElementById(`id_form-${i}-quantity`);
+
+    const autofillOnInput = (self, other) => () => {
+        delete self.dataset.autofilled;
+
+        if (!other.value || other.dataset.autofilled) {
+            other.value = self.value;
+            other.dataset.autofilled = true;
+        }
+    };
+
+    originalQuantity.addEventListener('input', autofillOnInput(originalQuantity, quantity));
+    quantity.addEventListener('input', autofillOnInput(quantity, originalQuantity));
+};
+
+const addFormButton = document.getElementById('addForm');
+
+const addForm = () => {
+    const form = document.getElementById('formTemplate').cloneNode(true);
+    const i = totalForms.value++;
+    updateNames(form, i);
+
+    const heading = document.createElement('h3');
+    heading.innerText = `#${i+1}`;
+
+    addFormButton.before(heading, ...form.children);
+
+    autofillQuantity(i);
+    document.getElementById(`id_form-${i}-owner`).value = JSON.parse(document.getElementById('currentUser').textContent);
+};
+
+addFormButton.addEventListener('click', addForm);
+
+for (let i = 0; i < totalForms.value; ++i) {
+    autofillQuantity(i);
+}
diff --git a/lelcsc/core/templates/base.html b/lelcsc/core/templates/base.html
index fafe60a..e9a1879 100644
--- a/lelcsc/core/templates/base.html
+++ b/lelcsc/core/templates/base.html
@@ -28,5 +28,6 @@
                 e.classList.remove('show');
             });
         </script>
+        {% block extra_js %}{% endblock %}
     </body>
 </html>
diff --git a/lelcsc/core/templates/core/add_stock.html b/lelcsc/core/templates/core/add_stock.html
new file mode 100644
index 0000000..9c26f70
--- /dev/null
+++ b/lelcsc/core/templates/core/add_stock.html
@@ -0,0 +1,32 @@
+{% extends "base.html" %}
+
+{% load django_bootstrap5 %}
+{% load i18n %}
+{% load static %}
+
+{% block page_title %}{% translate "Add stock" %}{% endblock %}
+
+{% block content %}
+<h1>{% translate "Add stock" %}</h1>
+<form class="mb-3" method="post">
+    {% csrf_token %}
+    {{ formset.management_form }}
+    {% bootstrap_formset_errors formset layout="floating" %}
+    {% for form in formset %}
+        <h3>#{{ forloop.counter }}</h3>
+        {% bootstrap_form form layout="floating" %}
+    {% endfor %}
+    {% bootstrap_button "+" button_class="btn-outline-secondary" button_type="button" id="addForm" %}
+    {% translate "Add" as add_button_text %}
+    {% bootstrap_button button_type="submit" content=add_button_text %}
+</form>
+<div class="d-none" id="formTemplate">
+    {% bootstrap_form formset.empty_form layout="floating" %}
+</div>
+{% endblock %}
+
+{% block extra_js %}
+{{ properties|json_script:"properties" }}
+{{ request.user.username|json_script:"currentUser" }}
+<script src="{% static 'core/add_stock.js' %}"></script>
+{% endblock %}
diff --git a/lelcsc/core/urls.py b/lelcsc/core/urls.py
index f0603f3..573b57b 100644
--- a/lelcsc/core/urls.py
+++ b/lelcsc/core/urls.py
@@ -4,6 +4,7 @@ from . import views
 
 urlpatterns = [
     path("", views.index, name="index"),
+    path("add-stock", views.add_stock, name="add_stock"),
     path("unauthorized", views.unauthorized, name="unauthorized"),
     path("admin/login/", views.admin_login),
 ]
diff --git a/lelcsc/core/views.py b/lelcsc/core/views.py
index c2d8ca7..fe805a4 100644
--- a/lelcsc/core/views.py
+++ b/lelcsc/core/views.py
@@ -1,7 +1,14 @@
+from django.contrib import messages
 from django.contrib.auth.decorators import login_required
+from django.db import transaction
+from django.forms.models import model_to_dict
 from django.http import QueryDict
 from django.shortcuts import redirect, render
 from django.urls import reverse
+from django.utils.translation import ngettext
+
+from .forms import AddStockFormSet
+from .models import Component, Property, Stock, User, Value
 
 
 @login_required
@@ -13,6 +20,101 @@ def unauthorized(request):
     return render(request, "core/unauthorized.html", {})
 
 
+@login_required
+def add_stock(request):
+    property_models = {p.name: p for p in Property.objects.all()}
+
+    if request.method == "POST":
+        formset = AddStockFormSet(request.POST, initial=[{"owner": request.user}])
+        if not formset.is_valid():
+            return render(request, "core/add_stock.html", {"formset": formset})
+
+        try:
+            with transaction.atomic():
+                for form in formset:
+                    part_number = form.cleaned_data["part_number"]
+                    component, created = Component.objects.get_or_create(
+                        part_number__iexact=part_number,
+                        defaults={"part_number": part_number},
+                    )
+
+                    if created:
+                        properties = form.cleaned_data["properties"]
+                        for name in properties:
+                            if name not in property_models:
+                                property_kwargs = {
+                                    k: v
+                                    for k, v in properties[name].items()
+                                    if k
+                                    in (
+                                        "filterable",
+                                        "type",
+                                        "searchable",
+                                        "unit",
+                                        "scale",
+                                    )
+                                }
+                                property_models[name] = Property.objects.create(
+                                    name=name, **property_kwargs
+                                )
+                            property = property_models[name]
+
+                            value_kwargs = {
+                                k: v
+                                for k, v in properties[name].items()
+                                if k in ("integer", "text")
+                            }
+                            value_kwargs.setdefault("integer", 0)
+                            value_kwargs.setdefault("text", "")
+                            Value.objects.create(
+                                property=property, component=component, **value_kwargs
+                            )
+
+                    owner_name = form.cleaned_data["owner"]
+                    owner = User.objects.filter(username=owner_name).first()
+
+                    Stock.objects.create(
+                        component=component,
+                        quantity=form.cleaned_data["quantity"],
+                        original_quantity=form.cleaned_data["original_quantity"],
+                        total_value=form.cleaned_data["total_value"],
+                        location=form.cleaned_data["location"],
+                        owner=owner,
+                        owner_name=owner_name,
+                    )
+        except Exception as e:
+            messages.add_message(request, messages.ERROR, str(e))
+
+            return render(
+                request,
+                "core/add_stock.html",
+                {
+                    "formset": formset,
+                    "properties": list(map(model_to_dict, property_models.values())),
+                },
+            )
+
+        messages.add_message(
+            request,
+            messages.SUCCESS,
+            ngettext(
+                formset.total_form_count,
+                "Added %(count)d stock entry",
+                "Added %(count)d stock entries",
+            )
+            % {"count": formset.total_form_count},
+        )
+
+    return render(
+        request,
+        "core/add_stock.html",
+        {
+            "formset": AddStockFormSet(initial=[{"owner": request.user}]),
+            "properties": list(map(model_to_dict, property_models.values())),
+        },
+    )
+
+
 def admin_login(request):
     if request.user.is_authenticated:
         return redirect("unauthorized")