Oracle and Broadcom defy September weakness on AI contract wins
Massive AI contract backlogs and new custom chip customers allowed Oracle and Broadcom to generate outsized stock gains last September, demonstrating how contracted revenue can override seasonal market weakness.
Oracle and Broadcom generated massive stock gains in September 2025, defying the month's historical weakness. September is typically the market's worst month, finishing positive just 44 percent of the time since 1928 with an average decline of 1.2 percent. However, strong earnings prints during this period can produce outsize moves for artificial intelligence companies.
Oracle experienced a dramatic rally on September 10, 2025, surging 35.95 percent in a single session to add $244 billion in market value. The stock touched a 43 percent intraday gain, pushing the company's valuation to $922 billion in its best day since 1992. Remarkably, this massive valuation increase occurred despite the company actually missing analysts' earnings expectations for the period.
The true catalyst was a massive expansion in contracted future revenue. Oracle disclosed remaining performance obligations of $455 billion, a 359 percent increase from the previous year driven by four multibillion-dollar contracts signed with three customers in a single quarter. This proves that future revenue disclosures can easily override seasonal sentiment and reported profit misses.
Despite this rapid growth, Oracle's stock has since fallen 56 percent from its peak, highlighting underlying financial risks. The company currently carries $122 billion in debt, and its total backlog of $638 billion is heavily concentrated among financially strained AI customers like OpenAI. Investors are now waiting for clarity on this debt and backlog ahead of the company's next historical September earnings report.
Broadcom also delivered a strong September performance, reporting fiscal third-quarter results on September 4, 2025. The stock rose approximately 20 percent from pre-earnings levels as revenue grew 22 percent to a record $16 billion. AI chip revenue specifically jumped 63 percent to $5.2 billion, while free cash flow increased 47 percent to $7 billion.
The primary driver for Broadcom was the announcement of a new custom chip customer, later identified as AI start-up Anthropic. Broadcom’s business model relies on designing application-specific silicon for a small number of massive buyers. Consequently, securing a new major client fundamentally alters the company's revenue trajectory rather than just providing incremental growth to existing operations.
These events underscore a critical dynamic for market professionals evaluating seasonal trends and technology valuations. While four of the past five Septembers fell by an average of 4.2 percent, fundamental business momentum in the AI sector can easily disrupt established patterns. Contracted backlogs and concentrated custom chip wins remain the most potent catalysts for overriding broader market weakness.
