Malphite Runes explained
There's one set of runes for Malphite on patch 15.14 that is the clear favorite for LoL players and pros alike. The best Malphite rune paths on the position 
Top are 
Sorcery as the primary path and 
Inspiration as the secondary path with a pick rate of 44%. Besides picking runes on Malphite you should learn how to play Malphite and if you are interested in pro matches take a look on how a pro builds Malphite. If you want to discuss 
Malphite then you should visit the champion subreddit.
Malphite runes from primary path
Sorcery empoweres abilities of Malphite and increases the available champion resources. Most of high elo players – and our LoL pros in the the major regions – have agreed that Arcane Comet is the best keystone rune to run on Malphite. This keystone rune adds more damage to your abilities and increases your power in the laning phase. Other primary runes on Malphite are Manaflow Band, Transcendence and Scorch.
This is usually followed up by taking Manaflow Band for additional mana and mana regenaration. Transcendence for some more Ability Haste. Scorch increases your control in the early game.
Malphite runes from secondary path
When it comes to your secondary path, most Malphite players prefer to go with Inspiration. Inspiration opens creative opportunities on Malphite troughout the match. On the Inspiration path, the best runes for Malphite are 
Biscuit Delivery and 
Cosmic Insight.
Biscuit Delivery is a great rune for laning as it gives additional health and mana, which can help in more aggressive lanes. Cosmic Insight grants summoner spell and item haste.
FAQ for Malphite Runes
Which is the best keystone rune on Malphite?
The best keystone rune on Malphite is Arcane Comet. This Malphite runes setup is then referred as Malphite Arcane Comet.
What runes does Malphite use?
Runes from the paths Sorcery and Inspiration are the most used runes on Malphite. For the exact pick rates of Malphite runes used, you have to study the rune distribution presented.