LITE vs AAOI vs COHR vs IPGP

For growth investors, Applied Optoelectronics, Inc.

(AAOI) is the stronger pick with 82. 8% revenue growth year-over-year, versus 2. 7% for IPG Photonics Corporation (IPGP). IPG Photonics Corporation (IPGP) offers the better valuation at 143. 1x trailing P/E (78. 1x forward), making it the more compelling value choice. Analysts rate Lumentum Holdings Inc. (LITE) a "Buy" — based on 25 analyst ratings — the highest consensus in this comparison. The "better buy" depends entirely on your goals: growth investors should weight revenue trajectory, value investors should weight P/E and PEG, and income investors should weight dividend yield and streak.

On trailing P/E, IPG Photonics Corporation (IPGP) is the cheapest at 143.

1x versus Lumentum Holdings Inc. at 2441. 7x. On forward P/E, Coherent, Inc. is actually cheaper at 61. 6x — notably different from the trailing picture, reflecting expected earnings growth.

Over the past 5 years, Applied Optoelectronics, Inc.

(AAOI) delivered a total return of +1878%, compared to -44. 3% for IPG Photonics Corporation (IPGP). Over 10 years, the gap is even starker: LITE returned +36. 8% versus IPGP's +23. 6%. Past returns do not guarantee future results, and the stock with the higher historical return may already have its best growth priced in.

By beta (market sensitivity over 5 years), IPG Photonics Corporation (IPGP) is the lower-risk stock at 1.

68β versus Applied Optoelectronics, Inc. 's 4. 10β — meaning AAOI is approximately 144% more volatile than IPGP relative to the S&P 500. On balance sheet safety, Applied Optoelectronics, Inc. (AAOI) carries a lower debt/equity ratio of 23% versus 2% for Lumentum Holdings Inc. — giving it more financial flexibility in a downturn.

By revenue growth (latest reported year), Applied Optoelectronics, Inc.

(AAOI) is pulling ahead at 82. 8% versus 2. 7% for IPG Photonics Corporation (IPGP). On earnings-per-share growth, the picture is similar: IPG Photonics Corporation grew EPS 117. 8% year-over-year, compared to 71. 7% for Coherent, Inc.. Over a 3-year CAGR, AAOI leads at 26. 9% annualised revenue growth. Higher growth typically commands a higher valuation multiple — check whether the premium P/E or P/S is justified by the growth rate using the PEG ratio.

IPG Photonics Corporation (IPGP) is the more profitable company, earning 3.

1% net margin versus -8. 4% for Applied Optoelectronics, Inc. — meaning it keeps 3. 1% of every revenue dollar as bottom-line profit. Operating margin tells a similar story: COHR leads at 9. 4% versus -12. 0% for AAOI. At the gross margin level — before operating expenses — IPGP leads at 38. 0%, reflecting greater pricing power or product mix advantage. Stronger margins indicate durable pricing power, lower cost of revenue, or higher mix of software/services. They are one of the clearest signs of business quality.

On forward earnings alone, Coherent, Inc.

(COHR) trades at 61. 6x forward P/E versus 159. 3x for Applied Optoelectronics, Inc. — 97. 8x cheaper on a one-year earnings basis. Analyst consensus price targets imply the most upside for IPGP: 35. 2% to $141. 25.

None of the stocks in this comparison currently pay a material dividend.

All are effectively zero-yield and should be held for capital appreciation rather than income.

For long-horizon retirement investors, Coherent, Inc.

(COHR) is the stronger choice — it scores higher on the combination of lower volatility, dividend reliability, and long-term compounding (+1546% 10Y return). Lumentum Holdings Inc. (LITE) carries a higher beta of 2. 66 — meaning larger drawdowns in market downturns, which matters significantly when you cannot wait years for a recovery. Both have compounded well over 10 years (COHR: +1546%, LITE: +36. 8%), confirming both are viable long-term holds — but the lower-volatility option typically results in less emotional selling during corrections. Retirement portfolios generally favour predictability over maximum returns. Consult a financial advisor before making allocation decisions.

Both stocks operate in the Technology sector, making this a peer-level intra-sector comparison — the same macro tailwinds and headwinds will affect both.

In terms of investment character: LITE is a mid-cap high-growth stock; AAOI is a mid-cap high-growth stock; COHR is a mid-cap high-growth stock; IPGP is a small-cap quality compounder stock. These fundamental differences mean investors should not choose between them on a single metric — the "better stock" depends entirely on which of these characteristics aligns with your investment strategy.