Fortescue (ASX:FMG) reported softer quarterly performance alongside ongoing challenges at Iron Bridge and increased spending on non-core green energy projects, raising concerns over returns and valuation, Jefferies said in an April 24 note.

The company reported a softer quarter due to seasonal and weather impacts, with solid performance from its Pilbara hematite operations offset by ongoing underperformance at the Iron Bridge magnetite project, which continues to face throughput and margin challenges and may struggle to justify its value.

Jefferies noted that the company's $680 million investment in green energy capacity for third-party customers, such as industrial users and data centers, represents a strategic shift, but views it as non-core capital allocation that may justify a higher discount rate for its mining business until clearer returns emerge.

The equity research firm said that the company's Pilbara system is nearing port capacity constraints, a "good problem" that may allow higher-margin hematite production to displace costlier Iron Bridge volumes, as the company reviews its portfolio, trims Iron Bridge output, and keeps overall shipment guidance broadly unchanged.

The research firm added that the company remains financially solid with $4.2 billion in cash despite dividends and capital expenditure outflows and is expected to return to a net cash position longer term, but highlighted Iron Bridge uncertainty and higher green energy spending as risks, including a potential write-down, supporting a cautious outlook.

Jefferies maintained an underperform rating on Fortescue and reduced the price target to AU$16.50 from AU$17.50.