What snapped the S&P 500 winning streak last night?

The S&P 500 almost made October a winner, but fell at the final hurdle.

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A male party goer sits wearing a party hat and with a party blower in his mouth amid a bunch of balloons with a sad, serious look on his face as though the party is over or a celebration has fallen flat.

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Both ASX and American investors have probably gotten used to the S&P 500 Index (SP: .INX) delivering huge gains. With the flagship barometer of the American stock market up a whopping 20.3% in 2024 to date, it's not hard to see why.

While the S&P 500 has had a phenomenal year so far, it has also hit a bit of a rough patch over the past few days. It was only on Tuesday that the S&P 500 closed at 5,832.9 points. But last night, the index finished up at just 5,705.45 points—a 2.2% drop over two days. Last night alone, the S&P 500 shed a hefty 1.86% of its value.

Unfortunately, last night's loss alone means that the S&P 500 ends a significant winning streak. As reported by The Wall Street Journal, the index had risen in value for five straight months in a row before October. Last month would have made it six, the longest month-to-month winning streak for more than three years. Alas, last night's 1.86% drop means that the S&P 500 recorded a 0.99% loss for October.

So what ruined this party at the last moment?

Well, it seems that two of the largest stocks on the S&P 500 are at least partially responsible for last night's miserly performance.

Why did the S&P 500 choke at the October finish line?

The first is tech titan Microsoft Corporation (NASDAQ: MSFT).

As we covered this morning, Microsoft reported its latest quarterly earnings this morning (our time). And investors didn't exactly like what they saw.

Microsoft did report a 16% rise in revenues at US$65.59 billion, as well as earnings per share (EPS) of US$3.30. However, investors seemed disappointed by Microsoft's Azure cloud numbers, which came in slightly below what they did in the previous quarter. As did the company's artificial intelligence (AI) revenues.

As a result of these earnings, the Microsoft share price crashed 6.05% lower in this morning's trading session, leaving the company at US$406.35 a share.

Microsoft is currently the third-largest stock in the S&P 500. As such, this big fall would have been a major drag on the rest of the index.

The other big tech laggard in recent days has been Facebook-owner Meta Platoforms Inc (NASDAQ: META). Meta reported its own earnings earlier in the week. As our Fool colleagues over in the US covered, it was also a mixed quarter for this company.

Meta reported a 19% hike in year-on-year revenues for the quarter to US$40.6 billion, as well as a 37% surge in EPS to US$6.03. However, a 14% rise in operating expenses, driven by Meta's ambitious 'metaverse' plans, seemed to weigh in investors' minds. The Meta stock price fell 4.09% last night down to US$567.58.

Meta isn't quite as significant in the S&P 500 Index as Microsoft is. But this company is still the sixth-largest S&P 500 share, and as such, must share some of the blame for last night's S&P 500 route.

So, it seems that investors have these two S&P 500 giants to at least partially blame for October's disappointing finish. Let's see what happens this month.

Randi Zuckerberg, a former director of market development and spokeswoman for Facebook and sister to Meta Platforms CEO Mark Zuckerberg, is a member of The Motley Fool's board of directors. Motley Fool contributor Sebastian Bowen has positions in Meta Platforms and Microsoft. The Motley Fool Australia's parent company Motley Fool Holdings Inc. has positions in and has recommended Meta Platforms and Microsoft. The Motley Fool Australia's parent company Motley Fool Holdings Inc. has recommended the following options: long January 2026 $395 calls on Microsoft and short January 2026 $405 calls on Microsoft. The Motley Fool Australia has recommended Meta Platforms and Microsoft. The Motley Fool has a disclosure policy. This article contains general investment advice only (under AFSL 400691). Authorised by Scott Phillips.

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