According to a recent report by Sergey Galyonkin, who runs Steam Spy, Valve’s distribution service sold more than 350 million copies of paid games and through that, they have generated $3.5 Billion in earnings. While Sergey’s numbers are not 100% accurate, they are still pretty close to the actual numbers.

According to the report, April and December were the most profitable months for Valve, as the company generated a lot more revenue during them than any other month. In April 2015, Valve generated $411 million and in December, it generated $436 million, making these two the most profitable months for publishers. And even though July didn’t do as the other months, it still generated a lot of revenue, as can be seen below.

As for games, Grand Theft Auto V, Fallout 4 and Ark: Survival Evolved sold more copies than any other game in 2015, but in case of revenue, Metal Gear Solid V generated more revenue than Ark: Survival Evolved.

Grand Theft Auto V sold 3.8 million copies and generated a total of $161 million. Fallout 4 takes the second place on the chart as it sold 2.7 million copies and generated around $122 million in revenue. Ark: Survival Evolved sold around 2.4 million copies, while Metal Gear Solid V sold 859k copies. Despite that, the latter generated a lot more in revenue than the former.

This report suggests that the PC gaming industry healthy and continuing to grow. The PC worldwide core games market is worth around $27 billion. This is the main reason why most publishers are bringing their titles over to Valve’s platform.

2015 has also been a great year for Steam in terms of concurrent online users. It was revealed earlier that Steam had 8.5 million concurrent users at the start of 2015, in January. However, two days ago it was reported that Steam crossed 12.5 million concurrent users, giving it a 40 percent boost in just 12 months.

Share your thoughts on these statistics in the comments below.