ACI Worldwide (ACIW) vs Fastly (FSLY)
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 ACI Worldwide (ACIW) over the past year, gaining 242.7% versus a loss of 2.9%. Over five years, ACIW leads with a +63.0% price change compared with -34.7% for FSLY. ACI Worldwide is the larger company by market cap ($5.14 billion vs $4.67 billion), about 1.1 times the size, while Fastly is growing revenue faster (+14.8% vs +10.4%).
On valuation, ACI Worldwide trades at a lower forward P/E (13.0x vs 45.6x for Fastly). ACI Worldwide converts more of its revenue into profit, with a net margin of 12.9% 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 | ACIW | FSLY |
|---|---|---|
| Share price | $50.87 | $29.30 |
| Market cap | $5.14B | $4.67B |
| 1-day change | -0.39% | +15.86% |
| YTD return | +6.40% | +187.82% |
| 1-year return | -2.88% | +242.69% |
| 5-year return | +63.04% | -34.73% |
| P/E ratio (TTM) | 23.23 | — |
| Forward P/E | 13.01 | 45.63 |
| EPS (TTM) | $2.19 | $-0.53 |
| Dividend yield | 0.00% | 0.00% |
| Annual dividend | $0.00 | $0.00 |
| Revenue (latest FY) | $1.76B | $624.02M |
| Revenue growth (YoY) | +10.38% | +14.78% |
| Net income (latest FY) | $226.66M | $-121.68M |
| Gross margin | 48.99% | 57.08% |
| Operating margin | 18.75% | -19.07% |
| Net margin | 12.88% | -19.50% |
| 52-week high | $61.08 | $34.82 |
| 52-week low | $38.05 | $7.74 |
| Distance from 52-week high | -16.72% | -15.85% |
| Analyst consensus | none | buy |
| Avg. price target upside | +32.36% | -4.78% |
| Average volume | 906.83K | 6.36M |
| Shares outstanding | 100.96M | 159.30M |
| Employees | 2,930 | 1,140 |
| 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 ACIW by 245.6 percentage points over the past year.
- ACI Worldwide is more profitable, keeping 12.9 cents of every revenue dollar as net income versus -19.5 cents for Fastly.
About ACI Worldwide
ACIW stock →ACI Worldwide, Inc. develops, markets, installs, and supports software products and services for facilitating electronic payments in the United States and worldwide.
Technology · Computer Software: Prepackaged Software · 2,930 employees
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
ACIW vs FSLY FAQ
Which is bigger, ACI Worldwide or Fastly?
ACI Worldwide (ACIW) is larger, with a market capitalization of $5.14B compared with $4.67B for Fastly (FSLY).
Which stock has performed better over the past year, ACIW or FSLY?
FSLY returned +242.69% over the past 12 months, compared with -2.88% for ACIW (price return, excluding dividends). Past performance does not predict future results.
Are ACI Worldwide and Fastly in the same industry?
Yes. Both are classified in the Computer Software: Prepackaged Software industry within the Technology sector.