AAOI vs ATEN vs DGII Stock Comparison

Applied Optoelectronics, A10 Networks and Digi International Prices as of Nov 5, 2026 Peers: Industry group
ATEN A10 Networks, Inc.
$22.61 -20.9% 1M +24.7% 1Y
Market cap
$1.78B
P/E
41.4x
Revenue (TTM)
$310.17M
Div. yield
–
Networking Equipment Technology
5 wins
DGII Digi International Inc
$62.34 -15.7% 1M +71.9% 1Y
Market cap
$2.39B
P/E
49.0x
Revenue (TTM)
$506.21M
Div. yield
–
Networking Equipment Technology
3 wins

Head to Head

11 decided of 12

A10 Networks leads on 5 of the 12 questions below (A10 Networks 5, Applied Optoelectronics 3, Digi International 3). Which ones matter depends on what you are buying for; a cheap multiple and slow growth often come together.

QuestionAAOIATENDGIILeader
Larger companyMarket capitalisation $4.29B $1.78B $2.39B AAOI
Cheaper on earningsLower P/E, profitable companies only -130.7x 41.4x 49.0x ATEN
Cheaper on forward earningsLower price / next fiscal year consensus EPS 66.0x 22.6x 22.4x DGII
Faster revenue growthRevenue growth, trailing twelve months +77.2% +12.2% +20.3% AAOI
More profitableNet margin, trailing twelve months -4.4% 13.9% 9.6% ATEN
Better return on capitalReturn on invested capital -2.3% 8.9% 6.9% ATEN
Less leveragedLower net debt / EBITDA 68.1x -2.1x 0.7x ATEN
Higher dividend yieldTrailing dividend yield 0.00% 0.00% 0.00% –
Better 1-year returnPrice return, last 12 months +48.8% +24.7% +71.9% DGII
Better 5-year returnAnnualised price return, 5 years +51.6%/yr +6.4%/yr +22.0%/yr AAOI
Less volatileAnnualised volatility, 1 year 141.5% 40.6% 43.9% ATEN
Higher overall scoreMean of the five percentile scores vs peers 33/100 49/100 57/100 DGII

Percentile Scorecard

AAOIATENDGII

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

AxisAAOIATENDGII
Valuation 14 #96 of 112 35 #73 of 112 41 #67 of 112
Growth 64 #40 of 108 26 #80 of 108 66 #37 of 108
Profitability 18 #85 of 104 83 #19 of 104 80 #22 of 104
Financial Health 63 #44 of 116 36 #75 of 116 49 #60 of 116
Shareholder Returns 4 #80 of 83 65 #30 of 83 51 #41 of 83
Overall 33 49 57
  • AAOI ranked among 121 companies in Computer Hardware
  • ATEN ranked among 121 companies in Computer Hardware
  • DGII ranked among 121 companies in Computer Hardware

Price Performance

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

Returns

PeriodAAOIATENDGIISPY
1 month -64.0%-20.9%-15.7% -5.9%
3 months -62.3%-18.1%-24.9% -4.6%
6 months -70.2%-17.1%+0.5% +0.2%
Year to date +34.5%+27.8%+44.0% +7.5%
1 year +48.8%+24.7%+71.9% +8.2%
3 years +383.9%+105.7%+149.9% +68.3%
3 years, per year +69.2%+27.2%+35.7% +19.0%
5 years +700.2%+36.5%+169.8% +56.5%
5 years, per year +51.6%+6.4%+22.0% +9.4%
10 years +116.6%+203.9%+556.2% +251.5%
10 years, per year +8.0%+11.8%+20.7% +13.4%

Risk

MeasureAAOIATENDGIISPY
Volatility, 1Y 141.5%40.6%43.9% 13.6%
Downside volatility, 1Y 132.3%43.8%45.7% 14.2%
Beta vs S&P 500, 1Y 4.371.111.69 1.00
Return / volatility, 1Y 0.340.611.64 0.60
Max drawdown, 5Y -79.0%-44.6%-48.6% -25.4%
From 52-week high -79.0%-40.7%-26.9% -5.9%
52-week high $223.10$38.14$85.24 $779.14
52-week low $19.49$16.55$35.40 $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.

MultipleAAOIATENDGII
P/E now vs peer median -122.1xmedian 25.2x 38.0xmedian 25.2x 48.3xmedian 25.2x
P/S now vs peer median 5.7xmedian 2.4x 5.3xmedian 2.4x 4.7xmedian 2.4x
EV/EBITDA now vs peer median -463.5xmedian 16.2x 22.6xmedian 16.2x 21.7xmedian 16.2x
P/FCF now vs peer median -4.8xmedian 23.4x 26.9xmedian 23.4x 17.4xmedian 23.4x
P/B now vs peer median 1.9xmedian 2.3x 6.9xmedian 2.3x 3.5xmedian 2.3x
PEG now vs peer median -2.91median 0.98 -17.68median 0.98 3.04median 0.98

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 monthsAAOIATENDGII
Revenue $747.22M $310.17M $506.21M
Gross profit $215.22M $246.21M $323.07M
Operating income -$50.66M $50.08M $70.58M
Net income -$32.78M $42.97M $48.74M
Free cash flow -$883.41M $60.94M $135.98M
R&D $124.46M $77.12M $73.84M
EPS (diluted) $-0.37 $0.57 $1.25
Cash & equivalents $605.41M $54.70M $27.97M
Total debt $59.99M $219.52M $108.13M
Shares (diluted) 87.84M 75.65M 38.92M
Enterprise value $2.53B $304.34M $2.28B

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
MetricAAOIATENDGII
P/E -122.1x 38.0x 48.3x
P/FCF -4.8x 26.9x 17.4x
P/Operating cash flow -40.1x 21.3x 17.1x
P/S 5.7x 5.3x 4.7x
P/B 1.9x 6.9x 3.5x
P/Tangible book 1.9x 7.3x 7.4x
EV/EBITDA -463.5x 22.6x 21.7x
EV/EBIT -73.2x 30.0x 34.7x
EV/Revenue 5.0x 4.8x 4.8x
EV/FCF -4.2x 24.6x 18.0x
EV/Operating cash flow -34.9x 19.5x 17.7x
PEG (3Y EPS CAGR) -2.91 -17.68 3.04

Growth

14 metrics
MetricAAOIATENDGII
Revenue growth (1Y) 77.2% 12.2% 20.3%
Revenue CAGR (3Y) 50.6% 4.3% 4.9%
Gross profit growth (1Y) 74.0% 11.7% 23.4%
Gross profit CAGR (3Y) 70.3% 4.0% 9.3%
Operating income growth (1Y) -2.2% 4.5% 24.0%
Operating income CAGR (3Y) 2.8% -0.2% 9.7%
Net income growth (1Y) 79.0% -15.8% 14.2%
Net income CAGR (3Y) 19.3% -2.1% 18.0%
EPS growth (1Y) 84.8% -18.6% 10.5%
EPS CAGR (3Y) 41.9% -2.1% 15.9%
Operating cash flow growth (1Y) 37.3% -9.8% 30.1%
Operating cash flow CAGR (3Y) -101.6% 8.6% 59.2%
Free cash flow growth (1Y) -192.6% -13.7% 31.6%
Free cash flow CAGR (3Y) -275.9% 7.4% 60.8%

Profitability

14 metrics
MetricAAOIATENDGII
Gross margin 28.8% 79.4% 63.8%
EBITDA margin -1.1% 21.4% 22.3%
Operating margin -6.8% 16.1% 13.9%
Pretax margin -4.9% 17.5% 12.4%
Net margin -4.4% 13.9% 9.6%
FCF margin -118.2% 19.6% 26.9%
Operating cash flow margin -14.2% 24.8% 27.3%
Return on equity -1.7% 18.7% 7.2%
Return on assets -1.2% 6.5% 5.0%
Return on invested capital -2.3% 8.9% 6.9%
Return on capital employed -2.5% 17.8% 8.4%
Asset turnover 0.3x 0.5x 0.5x
Cash conversion (OCF / net income) 3.2x 1.8x 2.8x
Stock comp / revenue 2.4% 7.5% 3.4%

Financial Health

11 metrics
MetricAAOIATENDGII
Debt / assets 1.9% 32.4% 11.2%
Debt / equity 0.0x 0.9x 0.2x
Net debt / EBITDA 68.1x -2.1x 0.7x
Debt / FCF -0.1x 3.6x 0.8x
Liabilities / assets 28.5% 64.9% 29.0%
Equity / assets 71.5% 35.1% 71.0%
Interest coverage -13.1x – 8.9x
Current ratio 2.3x 1.3x 1.1x
Quick ratio 1.5x 1.1x 0.7x
Cash ratio 0.9x 1.0x 0.2x
Altman Z-score 3.15 3.18 6.35

Shareholder Returns

7 metrics
MetricAAOIATENDGII
Dividend yield – 1.1% –
Net buyback yield -41.5% 1.3% 0.1%
Shareholder yield -41.5% 2.4% 0.1%
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.

ConsensusAAOIATENDGII
Forward P/E 66.0xFY2026 22.6xFY2026 22.4xFY2026
EPS, next fiscal year $0.71FY2026 $1.00FY2026 $2.78FY2026
EPS growth, next FY – +11.1%FY2026 +32.4%FY2026
EPS growth, the year after +646.5% +13.0% +9.4%
Revenue, next fiscal year $994.70MFY2026 $342.96MFY2026 $519.66MFY2026
Revenue growth, next FY +118.3%FY2026 +18.0%FY2026 +20.8%FY2026
Revenue growth, the year after +185.6% +3.4% +3.8%

Institutional Ownership

13F filings, quarter ended Jun 30, 2026
HoldersAAOIATENDGII
Held by institutions 60.5% 100.0% 100.0%
Institutions holding 482 312 285
Change in shares held, QoQ -3.5% +5.8% +1.6%
Institutions buying 313 172 143
Institutions selling 144 99 105
Buyers to sellers 2.17 1.74 1.36

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.

AAOIATENDGII
AAOI 1.00 0.33 0.30
ATEN 0.33 1.00 0.30
DGII 0.30 0.30 1.00

Add a Peer

Largest companies in the same industry

Related Comparisons

Frequently Asked Questions

Which is bigger, AAOI, ATEN and DGII?

Applied Optoelectronics (AAOI) is the largest by market capitalisation: Applied Optoelectronics (AAOI) $4.29B, A10 Networks (ATEN) $1.78B, Digi International (DGII) $2.39B.

Which stock is cheaper, AAOI, ATEN and DGII?

A10 Networks (ATEN) trades on the lowest price-to-earnings ratio (Applied Optoelectronics (AAOI) -130.7x, A10 Networks (ATEN) 41.4x, Digi International (DGII) 49.0x). On next year's consensus earnings, Digi International (DGII) is cheapest (Applied Optoelectronics (AAOI) 66.0x, A10 Networks (ATEN) 22.6x, Digi International (DGII) 22.4x). 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: Applied Optoelectronics (AAOI) +77.2%, A10 Networks (ATEN) +12.2%, Digi International (DGII) +20.3%.

Which company is more profitable?

A10 Networks (ATEN) has the highest net margin (Applied Optoelectronics (AAOI) -4.4%, A10 Networks (ATEN) 13.9%, Digi International (DGII) 9.6%). On return on invested capital, A10 Networks (ATEN) leads (Applied Optoelectronics (AAOI) -2.3%, A10 Networks (ATEN) 8.9%, Digi International (DGII) 6.9%).

Which stock has performed better?

Over the past year Digi International (DGII) returned the most: Applied Optoelectronics (AAOI) +48.8%, A10 Networks (ATEN) +24.7%, Digi International (DGII) +71.9%. Over five years, Applied Optoelectronics (AAOI) compounded fastest (Applied Optoelectronics (AAOI) +51.6%/yr, A10 Networks (ATEN) +6.4%/yr, Digi International (DGII) +22.0%/yr). Returns are price only, before dividends.

Which stock is riskier?

By one-year price volatility, A10 Networks (ATEN) has been the steadiest (Applied Optoelectronics (AAOI) 141.5%, A10 Networks (ATEN) 40.6%, Digi International (DGII) 43.9%). Volatility measures how widely the price swings, not the risk of the business.

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

There is no single answer; it depends on what you are buying for. On the 12 head-to-head measures on this page, A10 Networks (ATEN) leads on 5. 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.