diff --git a/Utilities/for_fastas/sharedOGs.py b/Utilities/for_fastas/sharedOGs.py
new file mode 100644
index 0000000..256b659
--- /dev/null
+++ b/Utilities/for_fastas/sharedOGs.py
@@ -0,0 +1,56 @@
+#Author, date: ACL June 8 2023
+#Motivation: Get record of OG presence across taxa from ReadyToGo files
+#Intent: Create a spreadsheet summarizing OG presence
+#Inputs: A folder of ReadyToGo files
+#Outputs: Spreadsheet
+#Example: Python sharedOGs.py ReadyToGo_AA
+
+
+import os, sys
+from Bio import SeqIO
+from tqdm import tqdm
+
+
+input_dir = sys.argv[1]
+
+print('\nCreating a record of taxa per OG...')
+
+taxa_by_og = { }
+for file in tqdm(os.listdir(input_dir)):
+	if file.split('.')[-1] in ('fasta', 'faa', 'fna', 'fa'):
+		tax = file[:10]
+		for rec in SeqIO.parse(input_dir + '/' + file, 'fasta'):
+			if rec.id[-10:] not in taxa_by_og:
+				taxa_by_og.update({ rec.id[-10:] : [] })
+
+			taxa_by_og[rec.id[-10:]].append(tax)
+
+
+print('\nWriting output file...')
+
+all_taxa = sorted(list(dict.fromkeys([tax for og in taxa_by_og for tax in taxa_by_og[og]])))
+all_maj = sorted(list(dict.fromkeys([tax[:2] for og in taxa_by_og for tax in taxa_by_og[og]])))
+with open('OGSharedness.csv', 'w') as o:
+	o.write('OG,Sequences,Species,Paralogness,MinorClades,MajorClades,' + ','.join(all_maj) + ',' + ','.join(all_taxa) + '\n')
+	for og in tqdm(taxa_by_og):
+
+		og_majs = list(dict.fromkeys([tax[:2] for tax in taxa_by_og[og]]))
+		og_taxa = list(dict.fromkeys(taxa_by_og[og]))
+		
+		o.write(og + ',' + str(len(taxa_by_og[og])) + ',' + str(len(list(dict.fromkeys(taxa_by_og[og])))) + ',' + str(len(taxa_by_og[og])/len(list(dict.fromkeys(taxa_by_og[og])))) + ',' + str(len(list(dict.fromkeys([tax[:5] for tax in taxa_by_og[og]])))) + ',' + str(len(list(dict.fromkeys([tax[:2] for tax in taxa_by_og[og]])))))
+		for maj in all_maj:
+			if maj in og_majs:
+				o.write(',' + str(len([tax for tax in og_taxa if tax[:2] == maj])))
+			else:
+				o.write(',0')
+
+		for tax in all_taxa:
+			if tax in taxa_by_og[og]:
+				o.write(',' + str(taxa_by_og[og].count(tax)))
+			else:
+				o.write(',0')
+		o.write('\n')
+
+
+
+