The average closing price for Microsoft (MSFT) in May 2018 was $89.88. It was up 6.5% for the month. The latest price is $517.35.

DATE	OPEN	HIGH	LOW	CLOSE	VOLUME
May 31 2018	$92.21	$92.86	$91.58	$91.79	34,140,900
May 30 2018	$91.30	$92.18	$90.93	$91.90	22,158,500
May 29 2018	$90.87	$91.83	$90.30	$91.02	28,671,000
May 25 2018	$91.29	$91.92	$90.88	$91.35	18,363,900
May 24 2018	$91.69	$91.89	$89.91	$91.30	26,649,300
May 23 2018	$89.82	$91.69	$89.45	$91.63	21,251,200
May 22 2018	$90.72	$91.17	$90.27	$90.55	15,441,200
May 21 2018	$90.09	$91.02	$89.90	$90.64	19,422,500
May 18 2018	$89.17	$90.02	$89.17	$89.49	17,865,800
May 17 2018	$89.86	$90.59	$89.00	$89.32	17,246,700
May 16 2018	$90.42	$90.46	$89.73	$90.22	17,384,700
May 15 2018	$89.92	$90.48	$89.09	$89.99	24,594,000
May 14 2018	$90.55	$91.26	$89.98	$90.65	19,454,100
May 11 2018	$90.44	$90.50	$89.73	$90.34	16,778,300
May 10 2018	$90.12	$90.58	$89.74	$90.54	22,388,100
May 09 2018	$88.78	$89.67	$87.89	$89.64	27,327,400
May 08 2018	$88.63	$88.92	$87.90	$88.60	23,484,600
May 07 2018	$88.00	$89.43	$87.94	$88.98	24,242,000
May 04 2018	$86.29	$88.19	$85.92	$88.00	22,531,300
May 03 2018	$85.96	$87.78	$85.49	$86.99	31,142,500
May 02 2018	$87.84	$88.00	$86.17	$86.47	27,471,000
May 01 2018	$86.19	$88.12	$85.80	$87.85	31,408,900

Daily pricing data for Microsoft dates back to 3/13/1986, and may be incomplete.