This has probably been asked before; however, I cannot find a close answer.
QUEST: I would like a list of the historical changes to the S&P 500 components (I do not care about the cap-weights) since 1960.
symbol, company name, date change announced, and effective change date, action (added / removed / merged / name or symbol change)
caution: a purchased data set (limited to the last 10 years) is in conflict with a common "*wiki*" web-site
and both of the above reconcile only irregularly and inconsistently with a third frequently referenced list
finally, a popular and expen$ive US based financial analytics / data platform: 1) is limited to a relatively short recent time frame 2) does not reconcile completely against any of the first three
any assistance is greatly appreciated