Let these stock updates help direct you: ACI Worldwide, Tenet Healthcare and AIG

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ACI WORLDWIDE INC. $39 is a buy. The company (Nasdaq symbol ACIW; Manufacturing & Industry Sector; Shares outstanding: 116.8 million; Market cap: $4.6 billion; No dividend paid; Takeover Target Rating: Medium; www.aciworldwide.com) is the leading software provider for processing transactions by credit cards, debit cards, automated teller machines, point-of-sale terminals and interbank systems. Its products also work to cut fraud. Activist investor Starboard Value LP recently added 600,000 shares to its ACI shareholding, bringing its total position to 2 million shares. Starboard purchased the shares on the belief that they are undervalued and represent an attractive investment opportunity. Starboard wants the company to hire an advisor and look at all options to boost shareholder value, including a sale. Whether or not ACI will make any changes—or put itself up for sale—based on Starboard’s involvement is uncertain at this point. Either way, the activist’s involvement does serve to highlight ACI’s investment appeal. ACI Worldwide is a buy. TENET HEALTHCARE CORP. $48 is a hold. The company (New York symbol THC; Consumer Sector;…