How to counter Malphite
Let us take a look on how to beat Malphite. We will look at champions who are strong against Malphite and who are weak against Malphite. Use win rate, gold difference and creep score difference at minute 10 to find the best 
Top champion who counters Malphite. You can already win in champion select with the right counters for Malphite. If you want to know how to counter Malphite then you need to take into account the best picks vs Malphite and the worst picks vs Malphite. This Malphite counter data is based on matches played by Pros on patch 14.22 and previous ones. It is important to see whether Pros counter picked Malphite or whether they played as Malphite.
Champions used by Pros to counter pick Malphite
Looking at the matches from Pros (see table Pros counter picked Malphite) we can see that they picked 
Gnar most often to counter pick Malphite. The matchup Gnar vs Malphite occured 39 times. Malphite has 28 wins and 11 losses in this matchup. Learn how to counter pick Gnar to get another perspective on the data.
Lane outcome for Malphite
When looking at Malphite counters you will notice that win rates alone are not conclusional. Therefore we provide an overview (see table Lane Outcome) where you can see the lane outcome of Pros who played Malphite. The lane outcome of Malphite consists of three outcomes: Win, Loss or Draw. Let's take a look of Malphite lane and match outcome for specific matchups. Considering the lane outcome and the match outcome of a specific matchup, might enable you to find the right counter for Malphite.
Conclusion
Analyze the available data and learn how to beat Malphite. To master Malphite take also a look on Malphite builds and runes for Malphite. Good luck, Summoner!