Stock Market: Will S&P 500 Open Up or Down Today?

U.S. stock futures are trending higher early Monday, shaking off trending “Black Monday” crash fears on social media as Wall Street prepares for a pivotal week of mega-cap tech earnings and navigates ongoing geopolitical friction in the Middle East.

The Polymarket traders, a Polygon (CRYPTO: POL) based prediction platform, were heavily bullish for the Oct. 19 trading session. The “S&P 500 (SPX) Up or Down on October 19?” contract currently reflects an 88% chance of a higher open.

Why That Number Matters

Traders are leaning into positive index futures, dismissing weekend panic, and monitoring volatile energy markets:

• Positive Index Futures: Equity futures point to a strong green open across major benchmarks. Nasdaq 100 futures are leading the rebound, up 1.32%. S&P 500 futures advanced 0.80%. Dow Jones futures rose 0.54%, and S&P MidCap 400 futures gained 0.62%.

• Geopolitics & Oil: Following reports of a non-compliant oil tanker striking a naval mine near the Strait of Hormuz, Iranian Foreign Minister Abbas Araghchi accused Israeli Prime Minister Benjamin Netanyahu of driving the U.S. into another war to stay out of jail, adding that Iran has “unfinished jobs.” Meanwhile, Treasury Secretary Scott Bessent dismissed September’s hot inflation report as a temporary “energy shock” that will resolve after the Iran conflict. Energy prices cooled slightly in early trading; Brent crude dropped 1.64% to $108.06 a barrel, while WTI crude fell 1.50% to $97.53 a barrel.

• Earnings & Eco Data: Investors are preparing for a massive week of third-quarter earnings, with Magnificent 7 members Meta Platforms Inc. (NASDAQ:META) and Tesla Inc. (NASDAQ:TSLA) taking center stage on Wednesday. Other major reports due this week include Netflix Inc. (NASDAQ:NFLX), General Motors Co. (NYSE:GM), Lam Research Corp. (NASDAQ:LRCX), IBM Corp. (NYSE:IBM), and Procter & Gamble Co. (NYSE:PG).

The Bull Case and Market Outlook

A sharp selloff in the semiconductor sector last week led to trending “Black Monday” crash predictions across social media ahead of the Oct. 19 open—the 39th anniversary of the historic 1987 crash. However, market commentators like The Kobeissi Letter believe the fear is significantly “overdone.”

The Kobeissi Letter noted that over the past year and a half, every time “Black Monday” trended on social media, the S&P 500 subsequently climbed. They argued that if history is any guide, the S&P 500 should hit 8,000 soon.

The firm previously asserted that the S&P 500 is experiencing a “stealth” bear market within a broader bull market, as a handful of top stocks drive the majority of gains, suggesting the index could already be above 9,000 if not for the macroeconomic drag of the Iran war.

Well, this post struck a nerve.

Calls for a "Black Monday" stock market crash are trending again. Last night, we took the opposite view.

As with every market prediction we make, there are thousands of people urging others to "fade" us.

But take a look at the chart below. It… https://t.co/BjuFfm8asq pic.twitter.com/iD5twqce92

— The Kobeissi Letter (@KobeissiLetter) October 18, 2026

How the Previous Bet Played Out

The Oct. 16 Polymarket contract resolved “Down.” The contract recorded $43,470 in total trading volume

On Friday, the SPDR S&P 500 ETF Trust (NYSE:SPY) and Invesco QQQ Trust ETF (NASDAQ:QQQ), which track the S&P 500 and Nasdaq-100, respectively, closed lower. SPY fell 1.11% to $763.25, while QQQ declined 2.50% to $709.80. Meanwhile, the Dow tracker, State Street SPDR Dow Jones Industrial Average ETF Trust (NYSE:DIA), ended 0.38% lower at $519.10.

Disclaimer: This content was partially produced with the help of AI tools and was reviewed and published by Benzinga editors.

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