I found duplicate ticker PNW but after looking at wikipedia, it appears that one of them has been a subsidiary of the other since 1985 (entire period of SimFin data), so I think probably can delete the subsidiary data? (all the fundamental data of the subsidiary ARIZONA PUBLIC SERVICE CO 690574 appears to be duplicate of the parent holding company, PINNACLE WEST CAPITAL CORP 327292):
In February 1985, Arizona Public Service Company reorganized as a holding company, AZP Group Inc., with APS as the leading subsidiary. It traded under the ticker symbol AZP. 1985 earnings reached a new record high at almost US$290 million, and by the end of the year the stock price had doubled from its 1984 low.
In 1987, AZP Group changed its name to Pinnacle West Capital Corporation, and began trading under the new ticker symbol PNW.