diff --git a/CHANGELOG.md b/CHANGELOG.md
index dc4f437fc..0730ea215 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -14,6 +14,7 @@ and the versioning aims to respect [Semantic Versioning](http://semver.org/spec/
 - region of relevance, study subregion role, study region role, interacting region role, considered region role (#1749)
 - fuel blending quota, fuel quota blending value (#1763)
 - study report due to legal obligation (#1777)
+- market share and market share value (#1779)
 
 ### Changed
 - subregion, study region, study subregion, interacting region, considered region (#1749)
diff --git a/src/ontology/edits/oeo-social.omn b/src/ontology/edits/oeo-social.omn
index 1e0f69ae0..d4af74d83 100644
--- a/src/ontology/edits/oeo-social.omn
+++ b/src/ontology/edits/oeo-social.omn
@@ -2297,4 +2297,29 @@ pull request: https://github.com/OpenEnergyPlatform/ontology/pull/1748",
     
     SubClassOf: 
         <http://purl.obolibrary.org/obo/BFO_0000141>
-    
+
+
+
+Class: OEO_00160006
+
+    Annotations:
+        <http://purl.obolibrary.org/obo/IAO_0000115> "A market share is a quality of a market exchange which quantifies the proportion a good to the total amount of goods traded in that market exchange.",
+        <http://purl.obolibrary.org/obo/IAO_0000233> "issue: https://github.com/OpenEnergyPlatform/ontology/issues/1636
+pull request: https://github.com/OpenEnergyPlatform/ontology/pull/1779",
+        rdfs:label "market share"@en
+
+    SubClassOf:
+        <http://purl.obolibrary.org/obo/BFO_0000019>
+
+
+Class: OEO_00160007
+
+    Annotations:
+        <http://purl.obolibrary.org/obo/IAO_0000115> "A market share value is a fraction value that quantifies a market share.",
+        <http://purl.obolibrary.org/obo/IAO_0000233> "issue: https://github.com/OpenEnergyPlatform/ontology/issues/1636
+pull request: https://github.com/OpenEnergyPlatform/ontology/pull/1779",
+        rdfs:label "market share value"@en
+
+    SubClassOf:
+        OEO_00000350
+