Q3 2026 Earnings Season: The Highest Bar Since 2021, Carried by AI

Q3 2026 Earnings Season: The Highest Bar Since 2021, Carried by AI

Q3 earnings season begins the week of October 12 — JPMorgan kicks it off October 13, with the big banks following — and the bar is the highest heading into any reporting season since 2021. FactSet's blended estimate is 29.5% YoY earnings growth (up from 26.7% on June 30), on revenue growth of +12.3%. Unusually, estimates were raised into the print: "FactSet updated their stats on the rise in earnings expectations for Q3 since the start of the quarter (July 1st) which is now +2.8%. While not as large as we saw for Q2, (+3.4%), it is otherwise the most in over five years and compares to a 5-year average of -2.2%" (TheStreet Pro, citing FactSet). A record 72 S&P 500 companies issued positive guidance (previous record: 64 in Q2 2021), 44 of them tech; negative guidance is the lowest since Q2 2021.

The concentration is the story. Energy leads expected growth at +114% (up from +79.3% on July 1, on the oil shock), followed by Tech +65.0% and Comm Services +51.5% — no sector is expected to decline. But per Goldman's preview: "At the stock level, AI infrastructure stocks are expected to drive more than half of S&P 500 EPS growth in Q3. The top 10 contributing stocks are expected to account for over two-thirds of aggregate S&P 500 earnings growth this quarter, with Micron (MU) and Nvidia (NVDA) together accounting for more than 1/3 of index growth.¹" The median S&P 500 stock is expected to grow EPS just 9% — versus 29.5% for the index (see Micron's $54B Quarter: The AI Memory Supercycle Prints Its Proof and Breadth at Dot-Com Extremes; Rate-Sensitive Stocks Get a Lifeline From the Jobs Miss).

Goldman also frames why the market trades at only 19x forward earnings despite record profits: investors see "over-earning" — hyperscalers are on track to spend ~$800B on capex this year, driving roughly half of 2026's S&P 500 earnings growth, a contribution Goldman expects to fade. Ed Yardeni's numbers: forward P/E 19.0 (Mag-7 at 22.9, small/mid-caps below 15), forward earnings a record $406.45 — "With the 10-year yield above 5.00%, we see more downside than upside for valuations through year-end." Full-year estimates: CY2026 +32.4%, CY2027 +15.8%. Two quality-of-earnings flags for this season: Meta's YoY growth is flattered by a one-time 2025 tax charge (operating income roughly flat ex-that, per Forbes), and last quarter's $150B of "other income" from appreciating AI-stake investments won't repeat meaningfully. With the earnings yield barely above the 10-year, the three things to watch as the banks report: AI capex guidance, credit quality, and holiday-quarter guidance.