MicroStrategy (MSTR) was not included in the S&P 500 index during the September 2025 rebalancing, despite meeting quantitative eligibility criteria. The decision, which saw Robinhood (HOOD) added, has sparked discussions about the discretionary power of the S&P Dow Jones Indices committee and its cautious approach to companies with significant cryptocurrency exposure, leading to varied market reactions.

U.S. equities saw shifts in specific sectors following the S&P 500 index rebalancing announced on September 5, 2025. Notably, MicroStrategy (MSTR) was not included in the prestigious index, defying some analyst expectations. This exclusion triggered a decline in MicroStrategy's stock, while newly added constituents, such as Robinhood (HOOD), experienced significant advances.

The Event in Detail

The S&P Dow Jones Indices committee announced its latest rebalancing decisions, revealing the omission of MicroStrategy from the S&P 500. MicroStrategy appeared to satisfy the established quantitative criteria for inclusion, which mandate a U.S. listing, a market capitalization exceeding $8.2 billion, high liquidity, a public float of at least 50%, and positive earnings for both the most recent quarter and the trailing four quarters. The company reported a market capitalization of approximately $95.95 billion and strong Q2 2025 earnings, with $10 billion in net income and $14 billion in operating income, largely attributed to new fair-value accounting standards for its substantial Bitcoin holdings.

Despite meeting these metrics, the committee opted to include Robinhood Markets Inc., AppLovin Corp., and Emcor Group Inc. instead. Following the announcement, MicroStrategy's shares declined by 2.9% in after-hours trading, falling below the $330 level. Conversely, Robinhood's stock advanced by 7% after the market close on news of its unexpected inclusion. MicroStrategy currently holds approximately 638,460 Bitcoin, valued near $70-72 billion, positioning its stock as a significant proxy for the cryptocurrency's performance.

Analysis of Market Reaction

The primary rationale behind MicroStrategy's exclusion appears to be the perceived inconsistency of its earnings, heavily influenced by the volatile nature of its Bitcoin treasury. The S&P Dow Jones Indices committee prioritizes financial stability and diversified business models. The company's substantial reliance on Bitcoin's price fluctuations likely raised concerns regarding its long-term stability within the index.

Analyst Vincent Van Code observed that MicroStrategy's financial results frequently fluctuate due to unrealized gains and losses on its Bitcoin holdings, making it a less conventional candidate for the S&P 500. This exclusion means MicroStrategy will not benefit from an estimated $10-16 billion in passive investment inflows from index funds and exchange-traded funds (ETFs) that track the S&P 500.

Bloomberg ETF strategist Eric Balchunas criticized the S&P's Index Committee, stating,

You have to realize SPX is essentially an active fund run by a secret committee.

This sentiment highlights the committee's discretionary power, which can override strict rules-based inclusion criteria, leading to market debate regarding the transparency and methodology of index governance.

Broader Context and Implications

MicroStrategy's omission represents a setback for its institutional recognition and could impact its capacity to secure additional capital. The decision also sends a broader signal regarding the S&P 500's cautious approach to companies with significant exposure to cryptocurrencies. Despite the inclusion of other crypto-linked entities like Coinbase and Block in the index, the committee appears to apply a "higher bar" for firms heavily weighted in digital assets.

MicroStrategy co-founder Michael Saylor emphasized his firm's substantial returns, noting that MicroStrategy delivered an annualized return of 92% since adopting its Bitcoin treasury strategy in 2020, outperforming Bitcoin's 55% and the S&P 500's 14% over the same period. The company continued its Bitcoin acquisition strategy, purchasing an additional 1,955 Bitcoin between September 2 and September 7, bringing its total holdings to 638,460 Bitcoin with a reported value of $71.7 billion.

Looking Ahead

For MicroStrategy, future S&P 500 eligibility may necessitate a diversification of its business model or a sustained demonstration of profitability beyond gains derived from its Bitcoin holdings. This could involve an expansion of its core software operations or an adjustment to its Bitcoin acquisition strategy. The committee's decision potentially slows the broader integration of crypto-related businesses into mainstream indices and suggests that MicroStrategy's stock will likely remain a high-beta play, closely correlated with the performance of the cryptocurrency market.