DGII vs AAOI vs CALX Stock Comparison

Digi International, Applied Optoelectronics and Calix Prices as of Oct 29, 2026 Peers: Industry group
DGII Digi International Inc
$77.63 +1.5% 1M +103.5% 1Y
Market cap
$2.75B
P/E
56.5x
Revenue (TTM)
$506.21M
Div. yield
–
Networking Equipment Technology
4 wins
CALX Calix, Inc
$38.31 +14.3% 1M -38.4% 1Y
Market cap
$2.33B
P/E
45.6x
Revenue (TTM)
$1.11B
Div. yield
–
Networking Equipment Technology
3 wins

Head to Head

11 decided of 12

Applied Optoelectronics leads on 4 of the 12 questions below (Applied Optoelectronics 4, Digi International 4, Calix 3). Which ones matter depends on what you are buying for; a cheap multiple and slow growth often come together.

QuestionDGIIAAOICALXLeader
Larger companyMarket capitalisation $2.75B $5.59B $2.33B AAOI
Cheaper on earningsLower P/E, profitable companies only 56.5x -98.1x 45.6x CALX
Cheaper on forward earningsLower price / next fiscal year consensus EPS 27.9x 111.5x 23.6x CALX
Faster revenue growthRevenue growth, trailing twelve months +20.3% +61.8% +27.8% AAOI
More profitableNet margin, trailing twelve months 9.6% -9.6% 4.6% DGII
Better return on capitalReturn on invested capital 6.9% -4.2% — DGII
Less leveragedLower net debt / EBITDA 0.7x 13.8x — DGII
Higher dividend yieldTrailing dividend yield 0.00% 0.00% 0.00% –
Better 1-year returnPrice return, last 12 months +103.5% +123.2% -38.4% AAOI
Better 5-year returnAnnualised price return, 5 years +29.2%/yr +59.6%/yr -9.4%/yr AAOI
Less volatileAnnualised volatility, 1 year 40.8% 139.0% 41.6% DGII
Higher overall scoreMean of the five percentile scores vs peers 59/100 32/100 76/100 CALX

Percentile Scorecard

DGIIAAOICALX

Each axis is the mean percentile of its metrics against the company's industry group. 100 is the best in the group, 50 the middle.

Scores by Axis

AxisDGIIAAOICALX
Valuation 42 #65 of 112 12 #99 of 112 60 #46 of 112
Growth 70 #33 of 108 54 #50 of 108 82 #20 of 108
Profitability 82 #20 of 104 16 #88 of 104 64 #38 of 104
Financial Health 48 #61 of 116 71 #34 of 116 77 #28 of 116
Shareholder Returns 53 #37 of 78 9 #71 of 78 97 #3 of 78
Overall 59 32 76
  • DGII ranked among 121 companies in Computer Hardware
  • AAOI ranked among 121 companies in Computer Hardware
  • CALX ranked among 121 companies in Computer Hardware

Price Performance

Price return, split-adjusted, before dividends. Click a name to hide or show it.

Returns

PeriodDGIIAAOICALXSPY
1 month +1.5%-21.3%+14.3% +0.7%
3 months +13.8%-12.1%+8.9% +3.7%
6 months +38.5%-51.8%-12.1% +7.1%
Year to date +79.3%+127.2%-27.6% +12.8%
1 year +103.5%+123.2%-38.4% +11.9%
3 years +206.2%+1,018.5%+16.2% +85.2%
3 years, per year +45.3%+123.8%+5.1% +22.8%
5 years +260.2%+935.2%-38.8% +67.6%
5 years, per year +29.2%+59.6%-9.4% +10.9%
10 years +700.3%+302.2%+498.6% +262.0%
10 years, per year +23.1%+14.9%+19.6% +13.7%

Risk

MeasureDGIIAAOICALXSPY
Volatility, 1Y 40.8%139.0%41.6% 12.7%
Downside volatility, 1Y 38.6%127.1%43.8% 12.6%
Beta vs S&P 500, 1Y 1.434.320.88 1.00
Return / volatility, 1Y 2.540.89-0.92 0.94
Max drawdown, 5Y -48.6%-82.6%-65.3% -25.4%
From 52-week high -8.9%-64.5%-44.0% -1.2%
52-week high $85.24$223.10$68.42 $779.14
52-week low $35.40$19.49$33.15 $631.97

Valuation History

Weekly multiples on trailing twelve-month fundamentals. Negative or extreme readings (a loss year, a collapsed denominator) are left out so the chart stays readable.

MultipleDGIIAAOICALX
P/E now vs peer median 60.2xmedian 32.9x -113.3xmedian 32.9x 47.5xmedian 32.9x
P/S now vs peer median 5.8xmedian 2.9x 11.2xmedian 2.9x 2.2xmedian 2.9x
EV/EBITDA now vs peer median 26.8xmedian 20.0x -194.4xmedian 20.0x 28.0xmedian 20.0x
P/FCF now vs peer median 21.7xmedian 30.2x -11.1xmedian 30.2x 28.2xmedian 30.2x
P/B now vs peer median 4.3xmedian 2.9x 4.0xmedian 2.9x 3.4xmedian 2.9x
PEG now vs peer median 3.79median 1.08 -3.41median 1.08 6.72median 1.08

Financial History

Reported figures by fiscal period, placed on the calendar year (or quarter) each period ended in, so companies with different fiscal years line up.

Trailing twelve monthsDGIIAAOICALX
Revenue $506.21M $595.97M $1.11B
Gross profit $323.07M $172.33M $628.73M
Operating income $70.58M -$67.41M $61.25M
Net income $48.74M -$57.02M $51.19M
Free cash flow $135.98M -$600.81M $85.42M
R&D $73.84M $107.61M $207.99M
EPS (diluted) $1.25 $-0.70 $0.78
Cash & equivalents $27.97M $499.74M $68.91M
Total debt $108.13M $57.26M –
Shares (diluted) 38.92M 81.57M 65.51M
Enterprise value $2.64B $4.31B $1.17B

All Metrics

58 metrics · best in bold

Bold marks the best reading: the lowest positive value for multiples, leverage and payout, the highest for everything else. The bar under each value is its percentile against that company's own peers. Hover a value for its rank and the peer median.

Valuation

12 metrics
MetricDGIIAAOICALX
P/E 60.2x -113.3x 47.5x
P/FCF 21.7x -11.1x 28.2x
P/Operating cash flow 21.3x -50.7x 22.0x
P/S 5.8x 11.2x 2.2x
P/B 4.3x 4.0x 3.4x
P/Tangible book 9.2x 4.0x 3.4x
EV/EBITDA 26.8x -194.4x 28.0x
EV/EBIT 42.9x -92.6x 36.2x
EV/Revenue 6.0x 10.5x 2.0x
EV/FCF 22.3x -10.4x 26.0x
EV/Operating cash flow 21.9x -47.3x 20.3x
PEG (3Y EPS CAGR) 3.79 -3.41 6.72

Growth

14 metrics
MetricDGIIAAOICALX
Revenue growth (1Y) 20.3% 61.8% 27.8%
Revenue CAGR (3Y) 4.9% 40.9% 3.9%
Gross profit growth (1Y) 23.4% 62.0% 30.3%
Gross profit CAGR (3Y) 9.3% 73.3% 7.4%
Operating income growth (1Y) 24.0% -40.6% 273.3%
Operating income CAGR (3Y) 9.7% -2.8% 3.8%
Net income growth (1Y) 14.2% 63.4% 290.5%
Net income CAGR (3Y) 18.0% 6.2% 4.9%
EPS growth (1Y) 10.5% 74.5% 287.6%
EPS CAGR (3Y) 15.9% 33.2% 7.1%
Operating cash flow growth (1Y) 30.1% 15.2% 24.5%
Operating cash flow CAGR (3Y) 59.2% -168.6% 41.8%
Free cash flow growth (1Y) 31.6% -146.3% 19.4%
Free cash flow CAGR (3Y) 60.8% -294.2% 62.0%

Profitability

14 metrics
MetricDGIIAAOICALX
Gross margin 63.8% 28.9% 56.6%
EBITDA margin 22.3% -5.4% 7.1%
Operating margin 13.9% -11.3% 5.5%
Pretax margin 12.4% -10.6% 6.5%
Net margin 9.6% -9.6% 4.6%
FCF margin 26.9% -100.8% 7.7%
Operating cash flow margin 27.3% -22.1% 9.9%
Return on equity 7.2% -4.1% 7.1%
Return on assets 5.0% -2.9% 5.4%
Return on invested capital 6.9% -4.2% –
Return on capital employed 8.4% -4.5% 8.2%
Asset turnover 0.5x 0.3x 1.2x
Cash conversion (OCF / net income) 2.8x 2.3x 2.1x
Stock comp / revenue 3.4% 2.6% 7.2%

Financial Health

11 metrics
MetricDGIIAAOICALX
Debt / assets 11.2% 2.5% –
Debt / equity 0.2x 0.0x –
Net debt / EBITDA 0.7x 13.8x –
Debt / FCF 0.8x -0.1x –
Liabilities / assets 29.0% 27.5% 25.6%
Equity / assets 71.0% 72.5% 74.4%
Interest coverage 8.9x -19.1x –
Current ratio 1.1x 2.8x 2.8x
Quick ratio 0.7x 1.9x 1.6x
Cash ratio 0.2x 1.2x 0.9x
Altman Z-score 7.59 6.57 7.28

Shareholder Returns

7 metrics
MetricDGIIAAOICALX
Dividend yield – – –
Net buyback yield 0.0% -20.2% 7.9%
Shareholder yield 0.0% -20.2% 7.9%
Payout ratio (earnings) – – –
Payout ratio (FCF) – – –
Dividend growth (1Y) – – –
Dividend CAGR (3Y) – – –

Analyst Estimates

Solid lines are reported fiscal-year results; dashed lines are the consensus for the years ahead. Hover a year for the analysts' high and low, and how each result compared with its estimate.

ConsensusDGIIAAOICALX
Forward P/E 27.9xFY2026 111.5xFY2026 23.6xFY2026
EPS, next fiscal year $2.78FY2026 $0.71FY2026 $1.62FY2026
EPS growth, next FY +32.4%FY2026 – +20.9%FY2026
EPS growth, the year after +9.4% +646.5% +48.1%
Revenue, next fiscal year $519.66MFY2026 $994.70MFY2026 $1.11BFY2026
Revenue growth, next FY +20.8%FY2026 +118.3%FY2026 +11.0%FY2026
Revenue growth, the year after +3.8% +185.6% +18.8%

Institutional Ownership

13F filings, quarter ended Jun 30, 2026
HoldersDGIIAAOICALX
Held by institutions 100.0% 60.5% 94.5%
Institutions holding 284 481 289
Change in shares held, QoQ +1.6% -3.5% +0.5%
Institutions buying 143 313 148
Institutions selling 105 143 111
Buyers to sellers 1.36 2.19 1.33

Return Correlation

Daily returns, last 12 months

1.00 means two stocks move in lockstep, 0 that they move independently. Pairs below about 0.5 diversify each other.

DGIIAAOICALX
DGII 1.00 0.25 0.14
AAOI 0.25 1.00 0.24
CALX 0.14 0.24 1.00

Add a Peer

Largest companies in the same industry

Related Comparisons

Frequently Asked Questions

Which is bigger, DGII, AAOI and CALX?

Applied Optoelectronics (AAOI) is the largest by market capitalisation: Digi International (DGII) $2.75B, Applied Optoelectronics (AAOI) $5.59B, Calix (CALX) $2.33B.

Which stock is cheaper, DGII, AAOI and CALX?

Calix (CALX) trades on the lowest price-to-earnings ratio (Digi International (DGII) 56.5x, Applied Optoelectronics (AAOI) -98.1x, Calix (CALX) 45.6x). On next year's consensus earnings, Calix (CALX) is cheapest (Digi International (DGII) 27.9x, Applied Optoelectronics (AAOI) 111.5x, Calix (CALX) 23.6x). A lower multiple can reflect slower expected growth, so read it next to the growth figures.

Which company is growing faster?

Applied Optoelectronics (AAOI) grew revenue fastest over the trailing twelve months: Digi International (DGII) +20.3%, Applied Optoelectronics (AAOI) +61.8%, Calix (CALX) +27.8%.

Which company is more profitable?

Digi International (DGII) has the highest net margin (Digi International (DGII) 9.6%, Applied Optoelectronics (AAOI) -9.6%, Calix (CALX) 4.6%). On return on invested capital, Digi International (DGII) leads (Digi International (DGII) 6.9%, Applied Optoelectronics (AAOI) -4.2%).

Which stock has performed better?

Over the past year Applied Optoelectronics (AAOI) returned the most: Digi International (DGII) +103.5%, Applied Optoelectronics (AAOI) +123.2%, Calix (CALX) -38.4%. Over five years, Applied Optoelectronics (AAOI) compounded fastest (Digi International (DGII) +29.2%/yr, Applied Optoelectronics (AAOI) +59.6%/yr, Calix (CALX) -9.4%/yr). Returns are price only, before dividends.

Which stock is riskier?

By one-year price volatility, Digi International (DGII) has been the steadiest (Digi International (DGII) 40.8%, Applied Optoelectronics (AAOI) 139.0%, Calix (CALX) 41.6%). Volatility measures how widely the price swings, not the risk of the business.

Which is the better stock, DGII, AAOI and CALX?

There is no single answer; it depends on what you are buying for. On the 12 head-to-head measures on this page, Applied Optoelectronics (AAOI) leads on 4. Business Quant does not give investment advice; use the comparison as a starting point for your own research.

Data from SEC filings, exchange prices and consensus estimates, via Business Quant. Percentile scores compare each company with its own peer group, so two companies' scores are each relative to different peers unless you rank against the whole market. Price returns exclude dividends. Nothing on this page is investment advice.