The S&P 500 Is Near Record Highs. History Says That's Not a Good Reason to Stop Buying This ETF

The S&P 500 is near record highs, but Fidelity data going back to 1920 found that investing at all-time highs produced an average 9.9% return over the following year, 36% cumulatively over three years, and 63% over five years. The article argues that long-term investors should continue buying the Vanguard S&P 500 ETF rather than wait for a correction, while noting that investors needing funds within a few years should avoid equity-market risk.

Analysis

This is a low-information retail-flow item rather than a fundamental catalyst for NFLX or NVDA. Its practical relevance is marginally supportive for broad passive-beta demand (VOO/SPY), but incremental ETF inflows disproportionately reinforce the largest index weights; that can extend NVDA’s momentum and valuation premium while increasing the market’s sensitivity to any AI-capex disappointment. NFLX has little direct linkage beyond general risk appetite.

The more important second-order risk is that systematic and retail dip-buying can suppress realized volatility until a macro or earnings shock forces de-risking into a concentrated index. In that regime, SPY can appear resilient while equal-weight exposure (RSP) and cyclicals weaken first; a widening SPY-versus-RSP spread would signal narrowing breadth rather than a healthy new leg higher. The article’s historical framing does not control for starting valuation, index concentration, real-rate regime, or forward earnings-revision breadth—variables that determine whether continued inflows translate into multiple expansion or merely mask deteriorating internals.

Over the next 1-3 months, the relevant catalyst is not another retail endorsement but whether NVDA’s supplier/customer spending signals validate the implied duration of AI infrastructure demand. Over 6-18 months, passive concentration remains structurally favorable to mega-cap winners, but it creates asymmetric downside: a single guidance reset from NVDA or a major hyperscaler can transmit through index funds and pressure otherwise unrelated constituents. Falsify the cautionary breadth thesis if RSP sustainably outperforms SPY while forward earnings revisions broaden across financials, industrials, and small caps.

Key Decisions for Investors

• No standalone trade from this item; treat it as a weak sentiment/flow input rather than a reason to add broad-market beta.
• For existing SPY/VOO exposure over the next 1-3 months, monitor SPY versus RSP and equal-weight sector performance. If SPY advances while RSP underperforms by more than 5% over a rolling month, reduce incremental cap-weight additions and favor RSP or selectively funded sector exposure.
• Maintain NVDA exposure only with defined event risk around hyperscaler capex and earnings. A tactical hedge via short-dated NVDA put spreads is preferable to outright de-risking if implied volatility is not elevated; exit the hedge if customer capex guidance and NVDA forward revenue expectations continue to rise.
• Use a relative-value watch: long RSP / short SPY only after evidence of broadening revisions, not merely price strength. The trade requires confirmation from improving small/mid-cap breadth and stable long-end yields; absent that, the concentration trend can persist longer than valuation-based shorts.