biggest large cap monthly increase 1970s

Southwest Airlines (LUV) had the best month in the 1970s by a large-cap US stock in June 1972, returning 100%.

ASSETMONTH% RETURN
Southwest Airlines (LUV)
June 1972
100%
Southwest Airlines (LUV)
April 1973
100%
Southwest Airlines (LUV)
September 1973
100%
Southwest Airlines (LUV)
January 1974
100%
Southwest Airlines (LUV)
April 1974
100%
Southwest Airlines (LUV)
March 1975
100%
Lockheed Martin (LMT)
May 1975
77.67%
Teradyne (TER)
January 1975
68.75%
Agnico Eagle Mines (AEM)
February 1976
61.54%
Agnico Eagle Mines (AEM)
February 1977
59.26%
CVS Health (CVS)
January 1975
56.97%
American International (AIG)
October 1974
56.36%
Pentair (PNR)
February 1976
55.82%
Western Digital (WDC)
January 1979
53.31%
Colgate-Palmolive (CL)
October 1974
50.28%
Western Digital (WDC)
March 1979
50.01%
Southwest Airlines (LUV)
October 1975
50%
Lockheed Martin (LMT)
July 1978
48.24%
Teradyne (TER)
November 1979
45.71%
Deere (DE)
October 1974
45.32%
Consolidated Edison (ED)
January 1975
45.1%
Bristol-Myers Squibb (BMY)
October 1974
44.88%
Wells Fargo (WFC)
October 1974
44.54%
Sysco (SYY)
January 1975
43.93%
CVS Health (CVS)
March 1975
43.8%
Large-cap stocks are treated as having a market cap of $10B+.