The closing price for the S&P 500 (GSPC) in March 1980 was $102.09, on March 31, 1980. It was down 10.2% for the month. The latest price is $7,580.07.

DATE	OPEN	HIGH	LOW	CLOSE	VOLUME
March 31 1980	$100.68	$102.65	$100.02	$102.09	35,840,000
March 28 1980	$98.22	$101.43	$97.72	$100.68	46,720,000
March 27 1980	$98.68	$99.58	$94.23	$98.22	63,680,000
March 26 1980	$99.19	$101.22	$98.10	$98.68	37,370,000
March 25 1980	$99.28	$100.58	$97.89	$99.19	43,790,000
March 24 1980	$102.18	$102.18	$98.88	$99.28	39,230,000
March 21 1980	$103.12	$103.73	$101.55	$102.31	32,220,000
March 20 1980	$104.31	$105.17	$102.52	$103.12	32,580,000
March 19 1980	$104.10	$105.72	$103.35	$104.31	36,520,000
March 18 1980	$102.26	$104.71	$101.14	$104.10	47,340,000
March 17 1980	$105.23	$105.23	$101.82	$102.26	37,020,000
March 14 1980	$105.62	$106.49	$104.01	$105.43	35,180,000
March 13 1980	$106.87	$107.55	$105.10	$105.62	33,070,000
March 12 1980	$107.78	$108.40	$105.42	$106.87	37,990,000
March 11 1980	$106.51	$108.54	$106.18	$107.78	41,350,000
March 10 1980	$106.90	$107.86	$104.92	$106.51	43,750,000
March 07 1980	$108.65	$108.96	$105.99	$106.90	50,950,000
March 06 1980	$111.13	$111.29	$107.85	$108.65	49,610,000
March 05 1980	$112.78	$113.94	$110.58	$111.13	49,240,000
March 04 1980	$112.50	$113.41	$110.83	$112.78	44,310,000
March 03 1980	$113.66	$114.34	$112.01	$112.50	38,690,000

Daily pricing data for the S&P 500 dates back to 12/30/1927, and may be incomplete.