On December 11, 2024, Costco paid a $15.00 per share special dividend. Anyone with 100 shares received $1,500 — on top of their regular quarterly $1.16 payment that quarter. Beautiful surprise.
It also wrecked their dividend CAGR for the next five years.
The math problem in plain English
Dividend CAGR — your 3-year or 5-year dividend growth rate — is one of the cleanest signals of a healthy dividend payer. The formula:
CAGR = (Final / Initial)^(1/Years) − 1
For Costco WITHOUT the 2024 special:
- 2021 total dividend: $3.16 per share
- 2024 total dividend: $4.64 per share
- 3-yr CAGR: 13.7% — strong growth, totally accurate.
For Costco WITH the 2024 special:
- 2021 total dividend: $3.16
- 2024 total dividend: $4.64 regular + $15.00 special = $19.64
- 3-yr CAGR (raw): 83.9% — meaningless
- 2025 total (no special): drops to ~$5.00. The chart now shows a 75% "cut".
Neither number tells the truth. The 13.7% is the real growth rate. The special was a one-time gift, not the start of a trend, and the 2025 "drop" isn't a cut at all. Anyone reading the raw chart without knowing about the special draws the wrong conclusion.
How DiviDrip catches it
Open any ticker on DiviDrip and click through to the Stock Modal. On the Dividend Info tab, scroll down to the Streak Risk Chart. This visualization shows the dividend per share year-over-year, with a few smart filters running in the background.
The detection rule is simple:
- Compute the 3-year median dividend (a robust center, not skewed by outliers).
- For each prior year, check whether the actual dividend was more than 25% above that median.
- If yes, that year is flagged as a likely SPECIAL DISTORTION.
- The chart shows a yellow callout: "Your 3-year CAGR includes a one-time special in [year] — the underlying trend is closer to X% than the displayed Y%."
The same logic catches the reverse situation: if a year is more than 25% BELOW the median, that gets flagged as "possible missed payment" or "data anomaly" — common when a quarterly payment is delayed across a calendar-year boundary.
The 5 most famous specials of the last decade
| Year | Stock | Special amount | Why |
|---|---|---|---|
| 2024 | Costco (COST) | $15.00 | Excess cash; 5th special since 2004 |
| 2020 | Costco (COST) | $10.00 | Pre-COVID cash reserves |
| 2017 | Costco (COST) | $7.00 | Tax-reform anticipation |
| 2015 | EQT Corp (EQT) | $1.00 | Asset sale proceeds |
| 2012 | Costco (COST) | $7.00 | Fiscal-cliff dividend-tax planning |
Costco is the textbook serial special payer. Their pattern is remarkable — once every 3-7 years, they declare a big one. If you own COST and your 3-yr CAGR looks suspicious, the Streak Risk Chart callout is almost certainly catching this pattern.
What this means for your investment decision
- Don't treat a year-with-special as the new baseline. The dividend "dropped 75%" in 2025 is mechanical, not a real cut.
- Don't compute yield-on-cost using the special-inflated year. Your YoC would look magical for one year and then deflate. Use the regular dividend rate only.
- Watch for the cadence. Companies that pay specials every 3-5 years effectively boost shareholder returns by a few extra percentage points without committing to a permanent raise. That's a feature, not a bug — just don't mis-read the chart.
- Trust the Streak Risk Chart callout. When you see the yellow distortion warning, the "underlying trend" number it shows is the one to use — not the raw CAGR display.
FAQ
- What is a special dividend?
- A special (or "extra") dividend is a ONE-TIME payout outside the regular dividend schedule. The most famous example: Costco paid a $15 per share special dividend in December 2024 on top of its $1.16 regular quarterly dividend. Companies issue specials when they have excess cash, after a major asset sale, or to return capital without committing to a permanent dividend raise.
- Why do specials mess up CAGR math?
- Dividend CAGR (Compound Annual Growth Rate) is calculated from the dividend in year N vs year N-3 or N-5. A $15 special in 2024 inflates the 2024 "dividend per share" total to about $19.60 instead of the regular ~$4.50, then the next year drops back to ~$4.80. Treated naively, the math says "your dividend just fell 75%!" — but that's only because of the one-time payout. The streak isn't broken, the company didn't cut.
- How does DiviDrip detect these distortions?
- On the Stock Modal's Streak Risk Chart, DiviDrip looks at each prior year's dividend total and compares it to the 3-year median. If a year is MORE than 25% above that median, a "special-dividend distortion" callout appears with a yellow warning icon. The chart explains: "Your 3-year CAGR includes a one-time special in [year] — the underlying trend is closer to X% than the displayed Y%."
- What stocks pay specials regularly?
- A small but consistent group. Costco has paid 5 specials over the last 20 years (2004, 2012, 2017, 2020, 2024). EQT Corp paid one in 2015. Mastercard, Visa, and other cash-rich names occasionally consider them but most prefer buybacks. The pattern matters more than the names — once you know to look for it, the Streak Risk Chart catches the math distortion automatically.
Try it
Open DiviDrip and search COST. On the Stock Modal Dividend Info tab, scroll to the Streak Risk Chart. You'll see the yellow distortion callout for the 2024 special, and the chart explains exactly what the underlying trend is — the way every dividend-CAGR display should work but rarely does.