diff --git a/pb/__init__.py b/pb/__init__.py
index fbd325e..ab8998d 100644
--- a/pb/__init__.py
+++ b/pb/__init__.py
@@ -36,6 +36,11 @@ def get_study_details(studyid):
     return StudyDetailsSchema().dump(details)
 
 
+def sponsors(studyid):
+    sponsors = db.session.query(StudySponsor).filter(StudySponsor.SS_STUDY == studyid).all()
+    return StudySponsorSchema(many=True).dump(sponsors)
+
+
 def get_form(id, requirement_code):
     return
 
@@ -152,7 +157,7 @@ def site_map():
 # **************************
 from pb.forms import StudyForm, StudyTable, InvestigatorForm, StudyDetailsForm, ConfirmDeleteForm, StudySponsorForm
 from pb.models import Study, RequiredDocument, Investigator, StudySchema, RequiredDocumentSchema, InvestigatorSchema, \
-    StudyDetails, StudyDetailsSchema, StudySponsor, Sponsor
+    StudyDetails, StudyDetailsSchema, StudySponsor, Sponsor, SponsorSchema, StudySponsorSchema
 
 
 @app.route('/', methods=['GET', 'POST'])
@@ -219,7 +224,7 @@ def new_investigator(study_id):
     form = InvestigatorForm(request.form)
 
     # Remove options from form if unique investigator already exist, but AS_C and SI can happen many times.
-    investigators = db.session.query(Investigator).filter(Study.STUDYID == study_id).all()
+    investigators = db.session.query(Investigator).filter(Investigator.STUDYID == study_id).all()
     choices = form.INVESTIGATORTYPE.choices
     existing_types = [i.INVESTIGATORTYPE for i in investigators]
     existing_types = list(filter(lambda a: a != "AS_C", existing_types))
diff --git a/pb/api.yml b/pb/api.yml
index 6893ea9..ff153cb 100644
--- a/pb/api.yml
+++ b/pb/api.yml
@@ -90,6 +90,29 @@ paths:
                 type: array
                 items:
                   $ref: "#/components/schemas/Investigator"
+  /sponsors:
+    get:
+      tags:
+        - CR-Connect
+      summary: Sponsors associated with a study.
+      operationId: pb.sponsors
+      description: A list of all the sponsors related to a study
+      parameters:
+        - in: query
+          name: studyid
+          description: A valid studyid, as provided in the call to list all studies.
+          required: true
+          schema:
+            type: string
+      responses:
+        '200':
+          description: A list of sponsors
+          content:
+            application/json:
+              schema:
+                type: array
+                items:
+                  $ref: "#/components/schemas/Sponsor"
   /study:
     parameters:
       - in: query
@@ -155,6 +178,32 @@ components:
           format: string
           example: IDS - Investigational Drug Service Approval
           description: A descriptive name of the required dcoument.
+    Sponsor:
+      properties:
+        SP_NAME:
+          type: string
+          example: "AstraZeneca Pharmaceuticals LP (Wilmington, DE)"
+          description: A descriptive name
+        SP_TYPE:
+          type: string
+          example: "Industry"
+          description: the type of sponsor
+        SP_TYPE_GROUP_NAME:
+          type: string
+          example: "Industry"
+          description: The category of the type of sponsor
+        SS_STUDY:
+          type: number
+          example: 15333
+          description: The unqiue id of the associated study
+        COMMONRULEAGENCY:
+          type: boolean
+          example: true
+          description: Is this a common rule agency
+        SPONSOR_ID:
+          type: number
+          example: 1022
+          description: The unique id of the sponsor
     Investigator:
       properties:
         STUDYID:
diff --git a/pb/models.py b/pb/models.py
index 2312af6..fd521fe 100644
--- a/pb/models.py
+++ b/pb/models.py
@@ -52,6 +52,7 @@ class StudySponsor(db.Model):
 
 
 class StudySponsorSchema(ma.Schema):
+
     class Meta:
         fields = ("SS_STUDY", "SPONSOR_ID", "SP_NAME", "SP_TYPE", "SP_TYPE_GROUP_NAME", "COMMONRULEAGENCY")