Fastly (FSLY) vs Klaviyo Series A (KVYO)
Head-to-head comparison of performance, valuation, growth, profitability and dividends. Prices delayed 15 minutes; data as of Oct 10, 2026.
Summary
Fastly (FSLY) has outperformed Klaviyo Series A (KVYO) over the past year, gaining 242.7% versus a loss of 32.4%. Klaviyo Series A is the larger company by market cap ($5.18 billion vs $4.67 billion), about 1.1 times the size. On valuation, Klaviyo Series A trades at a lower forward P/E (16.4x vs 45.6x for Fastly).
Klaviyo Series A converts more of its revenue into profit, with a net margin of -2.6% versus -19.5%.
Summary generated from market data by MetaCap's automated system. Methodology
Relative performance
Percent change in share price from the first common trading day shown; excludes dividends.
Head-to-head
| Metric | FSLY | KVYO |
|---|---|---|
| Share price | $29.30 | $17.32 |
| Market cap | $4.67B | $5.18B |
| 1-day change | +15.86% | -1.42% |
| YTD return | +187.82% | -46.66% |
| 1-year return | +242.69% | -32.37% |
| 5-year return | -34.73% | — |
| P/E ratio (TTM) | — | 577.33 |
| Forward P/E | 45.63 | 16.38 |
| EPS (TTM) | $-0.53 | $0.03 |
| Dividend yield | 0.00% | 0.00% |
| Annual dividend | $0.00 | $0.00 |
| Revenue (latest FY) | $624.02M | $1.23B |
| Revenue growth (YoY) | +14.78% | +31.63% |
| Net income (latest FY) | $-121.68M | $-31.77M |
| Gross margin | 57.08% | 74.67% |
| Operating margin | -19.07% | -5.49% |
| Net margin | -19.50% | -2.57% |
| 52-week high | $34.82 | $33.36 |
| 52-week low | $7.74 | $12.53 |
| Distance from 52-week high | -15.85% | -48.07% |
| Analyst consensus | buy | strong_buy |
| Avg. price target upside | -4.78% | +53.41% |
| Average volume | 6.36M | 6.06M |
| Shares outstanding | 159.30M | 140.90M |
| Employees | 1,140 | 2,400 |
| Sector | Technology | Technology |
| Industry | Computer Software: Prepackaged Software | Computer Software: Prepackaged Software |
Highlighted cells mark the higher value for growth, returns, margins and yield, and the lower value for P/E ratios. Highlighting is a mechanical comparison, not a recommendation.
Key differences
- FSLY has outperformed KVYO by 275.1 percentage points over the past year.
- Klaviyo Series A is more profitable, keeping -2.6 cents of every revenue dollar as net income versus -19.5 cents for Fastly.
- Klaviyo Series A grew revenue faster in its latest fiscal year (+31.63% vs +14.78%).
About Fastly
FSLY stock →Fastly, Inc. operates an edge cloud platform for processing, serving, and securing its customer's applications in the United States, the Asia Pacific, Europe, and internationally.
Technology · Computer Software: Prepackaged Software · 1,140 employees
About Klaviyo Series A
KVYO stock →Klaviyo, Inc. provides a cloud-based software-as-a-service platform in the United States, rest of the Americas, the Asia-Pacific, the United Kingdom, rest of Europe, the Middle East, and Africa.
Technology · Computer Software: Prepackaged Software · 2,400 employees
FSLY vs KVYO FAQ
Which is bigger, Fastly or Klaviyo Series A?
Klaviyo Series A (KVYO) is larger, with a market capitalization of $5.18B compared with $4.67B for Fastly (FSLY).
Which stock has performed better over the past year, FSLY or KVYO?
FSLY returned +242.69% over the past 12 months, compared with -32.37% for KVYO (price return, excluding dividends). Past performance does not predict future results.
Are Fastly and Klaviyo Series A in the same industry?
Yes. Both are classified in the Computer Software: Prepackaged Software industry within the Technology sector.