Portfolio Diversification Analyzer

A common rule of thumb for dividend investors is 20 to 30 individual stocks spread across sectors. The table above shows why: with 5 equal-weight holdings, one company eliminating its dividend erases 20% of your income — $800 of $4,000 on a $100,000 portfolio at a 4% yield. At 20 holdings the same event costs 5% ($200), and at 40 holdings just 2.5% ($100). Past roughly 30–40 positions the protection per added stock shrinks while the research burden keeps growing, which is where many investors switch marginal dollars to a dividend ETF instead.

A widely used rule of thumb caps any single stock at 5% of the portfolio, with 10% as an absolute ceiling for a highest-conviction position. The logic is direct: if holdings yield similarly, a position's weight is the share of income you lose if it cuts to zero. A 5% position on a $100,000 portfolio yielding 4% puts $200 of $4,000 in annual income at risk — an annoyance. A 25% position puts $1,000 at risk — a quarter of your income from one board's decision. Winners that grow past the cap are usually trimmed back or diluted with new contributions elsewhere.

The conventional ceiling is 20–25% of the portfolio in any one sector. Sector risk is dangerous because dividend cuts cluster: energy companies cut together in 2020, banks cut together in 2008–2009, and REITs cut together in both. If 40% of a $100,000 portfolio yielding 4% sits in one sector and that sector halves its payouts, you lose 40% × 50% = 20% of your income — $800 of $4,000 — even though no single position looked oversized. Owning ten different regional banks is one bet, not ten; the analyzer above flags exactly this pattern.

For single-company risk, yes: a broad dividend ETF such as SCHD or VYM holds 100+ stocks, so one dividend cut moves the fund's payout by around 1% or less — versus the 20% hit a 5-stock portfolio takes from the same event. What one ETF does not eliminate is strategy and sector tilt: dividend indexes overweight financials, staples, and healthcare and exclude most high-growth technology, so the fund can lag the broad market for years at a time. Many investors pair a core dividend ETF with a handful of individual positions, which keeps each single-stock bet small while retaining control over yield and sector mix.