diff --git a/Utilities/for_trees/count_tips.py b/Utilities/for_trees/count_tips.py
new file mode 100644
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+++ b/Utilities/for_trees/count_tips.py
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+'''
+Author: Auden Cote-L'Heureux
+Last updated: 06/14/23 by Elinor
+Motivation: Count the number of occurences of each taxa in each OG in a post guidance file
+Dependencies: Bio python, os, sys
+Inputs: Directory of postguidance files
+Outputs: CSV file tallying all the counts of taxa in each OG file
+Command line: python count_tips.py --input <dir of postguidance files>
+'''
+
+import os
+import sys
+from Bio import SeqIO
+
+
+def get_args():
+
+	in_dir = ''
+	
+	if('--input' in sys.argv or '-i' in sys.argv):
+		try:
+			if('--input' in sys.argv):
+				in_dir = sys.argv[sys.argv.index('--input') + 1]
+			else:
+				in_dir = sys.argv[sys.argv.index('-i') + 1]
+		except IndexError:
+			print('\nError: Something went wrong went parsing the arguments... maybe you forgot to input an input directory of trees?\n')
+			print('\nPlease input a folder of .tre files:\n\n\tpython count_tips.py --input <path/to/folder>\n')
+			exit()
+	else:
+		print('\nPlease input a folder of .tre files:\n\n\tpython count_tips.py --input <path/to/folder>\n')
+		exit()
+		
+		
+	if(in_dir.endswith('/')):
+		in_dir = in_dir[:-1]
+		
+	if(not os.path.isdir(in_dir)):
+		print('\nPlease input a folder of .tre files:\n\n\tpython count_tips.py --input <path/to/folder>\n')
+		exit()
+				
+	return in_dir
+
+
+def count_tips(in_dir):
+
+	count_data = { }
+	for file in os.listdir(in_dir):
+		if(file.endswith('.fas')):
+			fname = in_dir + '/' + file
+			
+			count_data.update({ file : { } })
+			tips = [record.id[:10] for record in SeqIO.parse(in_dir+'/'+file, 'fasta')]
+					
+			for tip in tips:
+				tip = tip.strip()
+				if(tip[:10] not in count_data[file]):
+					count_data[file].update({ tip[:10] : 0 })
+				count_data[file][tip[:10]] += 1
+				
+	taxa = sorted(list(dict.fromkeys([tax for file in count_data for tax in count_data[file]])))
+				
+	with open('tip_count_data.csv', 'w') as o:
+		o.write(',' + ','.join(taxa) + '\n')
+		for file in count_data:
+			o.write(file)
+			for tax in taxa:
+				if(tax in count_data[file]):
+					o.write(',' + str(count_data[file][tax]))
+				else:
+					o.write(',0')
+			o.write('\n')	
+	
+	
+def main():
+
+	in_dir = get_args()
+
+	count_tips(in_dir)
+	
+
+main()
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