As the S&P Dow Jones Indices Committee finalizes new additions to the S&P 500, Marvell Technology (MRVL) stands out as a massive and hard-to-ignore candidate.

In the last two quarterly index rebalances, Marvell Technology was a leading company eligible for S&P 500 inclusion but was ultimately not selected. However, in terms of market capitalization, Marvell's size far surpasses the next eligible candidate. As of Wednesday's close, Marvell's market cap exceeded $260 billion, while the second-place candidate, Bloom Energy, had a market cap of only about $82 billion.

Market expectations are rising, with S&P Dow Jones Indices potentially announcing some constituent changes this Friday, following the quarterly rebalancing routine.

Jefferies trading desk analyst Jeffrey Faucetta stated in a client note on Wednesday that Marvell Technology is "widely viewed by the market as the next S&P 500 addition." The stock surged nearly 5% on Thursday, bringing its year-to-date gain to over 200%.

Stephens Inc. analyst Melissa Roberts pointed out that Marvell not only has a substantial current market cap but has also consistently maintained a valuation significantly above the minimum threshold for new S&P 500 additions for an extended period.

Marvell gained eligibility for index inclusion after meeting profitability requirements by the end of 2025, and Roberts noted that the company's average market cap over the past year was approximately $54 billion.

"I think it's important to see a company's market cap consistently at elevated levels," she added. This distinguishes Marvell from other companies that may see sharp, short-term valuation increases but could struggle to sustain those levels under normal conditions.

The Index Committee has significant discretion when selecting new members and does not strictly choose the most valuable eligible candidate. To be considered, companies must meet thresholds for probability, valuation, free-float market cap, and other factors. Committee members exercise their own judgment in deciding which firms are included. For example, during the March rebalance, four companies were added, but when the quarterly opportunity arose last June, the committee ultimately decided against making any changes to the S&P 500.

Roberts indicated that one factor the committee informally considers is sector balance. Marvell is an Information Technology company, a sector with a relatively smaller weight in the S&P 500 compared to the broader S&P Total Market Index.

Nevertheless, Marvell is not the only large IT company worth watching. There is also Flex Ltd (FLEX), an electronics manufacturer whose stock has soared due to AI technology, giving it a dominant position within the S&P MidCap 400 index. At Wednesday's close, its market cap reached $59 billion, while the second-place company, Twilio, had a market cap of $34 billion.

S&P Dow Jones Indices has recently focused on migrating constituents from the mid-cap index to the S&P 500. Since index weightings are based on market cap, this migration prevents large companies from disproportionately impacting an index designed for smaller firms. Furthermore, it reduces disruption for funds tracking the various indices.

A recent precedent exists where the committee added two companies from the same industry, such as during the March rebalance when optical component suppliers Lumentum Holdings Inc and Coherent Corp were both removed.