Arm Ltd. has filled out the roster of underwriters for its initial public offering, with 28 banks in all on the deal, people familiar with the matter said.

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In addition to four lead banks — Barclays Plc, Goldman Sachs Group Inc., JPMorgan Chase & Co. and Mizuho Financial Group — the offering will have 10 second-tier underwriters, including Bank of America Corp. Citigroup Inc., Deutsche Bank AG and Jefferies Financial Group Inc., the people said, asking not to be identified because the information was private.

A third-tier consists of a diverse group of 14 securities firms, such as Daiwa Securities Group Inc., HSBC Holdings Plc, Intesa Sanpaolo SpA and Societe Generale SA, they said.

A representative for Arm, which is majority owned by SoftBank Group Corp., declined to comment.

The Cambridge, UK-based chipmaker has been seeking to raise $8 billion to $10 billion in September in what would be the year’s biggest IPO, Bloomberg News has reported. The company is aiming to be valued in the listing at $60 billion to $70 billion.