Zynga spent close to $20 million on acquiring four additional companies in the third quarter, an analysis of the company’s amended IPO filings show.

In a filing submitted today that shared the company’s third quarter performance, the company said it spent a total of $40.6 million on buying 13 companies through the end of September. That’s up from $20.8 million it said it spent on nine companies through the first half of the year, in an older filing.

Assuming it was announced right when the deal closed, one of the four companies is known. It might be Toronto’s Five Mobile, which was a gun-for-hire studio that large brands would partner with to build their own mobile apps. That deal was announced in July.

The three others are unconfirmed. New York’s Astro Ape Studios was said to be another acquisition when the company’s executives all changed their LinkedIn job descriptions to that of Zynga employees. But Zynga never confirmed nor denied the deal.

Zynga has long had a fairly conservative strategy in acquiring companies, focusing on a $5 to 10 million price range purely for talent. The exception it’s made to date has been Newtoy, the McKinney, Texas-based company that Zynga agreed to buy for $53.3 million in cash and stock to establish a foothold on iOS where it lagged behind pure mobile-only gaming competitors last year. But that hasn’t stopped Zynga from looking at bigger ticket deals. After it lost the PopCap Games acquisition to rival Electronic Arts, sources say that Zynga entered exclusivity with Rovio Mobile in a deal that hasn’t come to fruition.

Below is a chart from the filing showing Zynga’s spending on acquisitions over the last seven quarters: