Capital Economics Sees 21% S&P 500 Drop by Late 2027, Bitcoin (BTC) in Focus

Bubble Warning for Late 2027

A research forecast from Capital Economics is putting a hard number on Wall Street's bubble anxiety — and the scenario carries direct implications for high-beta risk assets like Bitcoin (BTC). James Reilly, senior markets economist at the consultancy, projects that the S&P 500 will climb to 8,250 by the end of 2026 — a 7.7% gain from the September 11 close — before sliding to 6,500 by the end of 2027, a drawdown of roughly 21%. In the note, Reilly writes that the data are “broadly consistent with the late stages of a bubble,” adding that most of the indicators his team tracks have reached or approached levels last seen ahead of past equity market peaks. His evidence spans valuation, earnings expectations, the sustainability of AI investment, market concentration, and the pace of IPO and follow-on share issuance. The cyclically adjusted price-to-earnings ratio, or CAPE — which smooths corporate earnings across a decade to gauge long-run valuation — now sits near its dot-com era extreme. Expected 12-month earnings-per-share growth for S&P 500 companies has likewise climbed to levels comparable to the 2000 peak. On the AI buildout, Reilly warns that the combined free cash flow of large infrastructure players could flip negative in 2027 under the weight of capital spending, while concentration in a handful of mega-caps such as Broadcom (AVGO) and Palantir (PLTR), plus a heavy issuance calendar, further weakens the rally's foundation. The rate backdrop sharpens the risk: the 10-year US Treasury yield touched 4.97% on September 11, and Ruchir Sharma, chairman of Rockefeller International, has argued that a decisive break above 5% could deflate the AI trade by squeezing the bond issuance and equity fundraising that capital-intensive AI projects depend on.

VIX Calls Top 275,000 Contracts

Hedging activity on trading desks tells a parallel story. With the S&P 500 largely rangebound since late May, institutional investors are now positioning for two different downside scenarios at once: a sharp crash and a slow grind lower. Demand for crash protection shows up plainly in the options flow — purchases of October and November VIX call options have surpassed 275,000 contracts through large block trades in recent weeks, a bet that implied volatility spikes if equities drop faster than expected. The VIX itself trades near 15.5, below its four-year average, yet the volatility risk premium relative to realized price moves sits near the top of its post-2022 range — meaning crash insurance is no longer cheap. Meanwhile, some desks are buying structured products that profit when the index and volatility fall together. Antoine Porcheret, who runs institutional structured products for Citi across the UK, Europe, the Middle East and Africa, said trades betting on both the S&P 500 and the VIX declining simultaneously are emerging as demand builds for protection against a mild correction. The macro calendar concentrates the risk: the Federal Reserve's rate decision lands this week, with markets leaning toward a hike, and long-term Treasury yields already stand at multi-year highs. JPMorgan strategists have laid out option structures for a stagflation-style combination of falling stocks and rising rates, and flows into such trades have grown this year. Elevated oil prices and a possible stronger yen add further fuel — a yen rally could unwind carry trades and amplify global volatility. Adrian Zelio, chief executive of PremiaLab, noted that demand for systematic hedging against abrupt market moves keeps rising even as volatility-selling strategies for premium income continue. Ed Yardeni of Yardeni Research trimmed his “Roaring 2020s” scenario probability to 70% from 80% while lifting the bear case to 30% — still leaving it his base case. Readers tracking the market in real time can follow live spot and futures prices on Binance.

For our desk, the two pieces read as one thesis: late-cycle equity valuations now hinge on rates, and crypto sits squarely in that blast radius. Bitcoin (BTC) changes hands near $76,670 at the time of writing, and its sensitivity to rate expectations runs through the same channel Reilly identifies — discount rates and funding costs. A grinding equity correction could bleed flows into spot Bitcoin ETF products gradually; a 5% yield shock would hit far harder, as prior tightening episodes showed. AI-adjacent tokens and DeFAI projects face the same reckoning over cash-flow-less growth. Watch this week's Fed decision, not the forecasts.