Shares in the company have almost doubled over the past year and as of Friday's close, the company had a market capitalisation of A$14.6 billion.
In mid-2020, Pilbara lost its spot in the ASX 200 due to the slump in lithium prices but was re-added in March last year after prices started to take off.
Pilbara joins fellow lithium producer (and iron ore miner/crushing contractor) Mineral Resources in the ASX 50.
Meanwhile, struggling gold miner St Barbara will lose its spot in the ASX 200.
Shares in St Barbara are down more than 50% since the start of this year with its market cap now just $563 million.
The main reason is the continued underperformance of its flagship Gwalia mine in Leonora.
Former Western Areas boss Dan Lougher has been brought in to try to turn things around.
Engineering contractor Monadelphous Group will replace St Barbara in the ASX 200.
