IMOS vs AMKR

For growth investors, ChipMOS TECHNOLOGIES Inc.

(IMOS) is the stronger pick with 6. 3% revenue growth year-over-year, versus 6. 2% for Amkor Technology, Inc. (AMKR). Amkor Technology, Inc. (AMKR) offers the better valuation at 48. 2x trailing P/E (34. 4x forward), making it the more compelling value choice. Analysts rate ChipMOS TECHNOLOGIES Inc. (IMOS) a "Hold" — based on 1 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, Amkor Technology, Inc.

(AMKR) is the cheapest at 48. 2x versus ChipMOS TECHNOLOGIES Inc. at 48. 2x. On forward P/E, ChipMOS TECHNOLOGIES Inc. is actually cheaper at 0. 8x — notably different from the trailing picture, reflecting expected earnings growth. The PEG ratio (P/E divided by earnings growth rate) is the most growth-adjusted single valuation metric: ChipMOS TECHNOLOGIES Inc. wins at 0. 01x versus Amkor Technology, Inc. 's 24. 73x — a PEG below 1. 0 traditionally signals the market is underpricing earnings growth.

Over the past 5 years, Amkor Technology, Inc.

(AMKR) delivered a total return of +266. 1%, compared to +98. 5% for ChipMOS TECHNOLOGIES Inc. (IMOS). Over 10 years, the gap is even starker: AMKR returned +1222% versus IMOS's +301. 1%. 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), ChipMOS TECHNOLOGIES Inc.

(IMOS) is the lower-risk stock at 1. 36β versus Amkor Technology, Inc. 's 2. 87β — meaning AMKR is approximately 112% more volatile than IMOS relative to the S&P 500. On balance sheet safety, Amkor Technology, Inc. (AMKR) carries a lower debt/equity ratio of 35% versus 61% for ChipMOS TECHNOLOGIES Inc. — giving it more financial flexibility in a downturn.

By revenue growth (latest reported year), ChipMOS TECHNOLOGIES Inc.

(IMOS) is pulling ahead at 6. 3% versus 6. 2% for Amkor Technology, Inc. (AMKR). On earnings-per-share growth, the picture is similar: Amkor Technology, Inc. grew EPS 4. 9% year-over-year, compared to -25. 2% for ChipMOS TECHNOLOGIES Inc.. Over a 3-year CAGR, AMKR leads at -1. 8% 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.

ChipMOS TECHNOLOGIES Inc.

(IMOS) is the more profitable company, earning 6. 3% net margin versus 5. 6% for Amkor Technology, Inc. — meaning it keeps 6. 3% of every revenue dollar as bottom-line profit. Operating margin tells a similar story: AMKR leads at 7. 0% versus 5. 6% for IMOS. At the gross margin level — before operating expenses — AMKR leads at 14. 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.

The PEG ratio (forward P/E divided by expected earnings growth rate) is the most precise measure of undervaluation relative to growth potential.

By this metric, ChipMOS TECHNOLOGIES Inc. (IMOS) is the more undervalued stock at a PEG of 0. 01x versus Amkor Technology, Inc. 's 24. 73x. A PEG below 1. 0 is traditionally considered the threshold for growth-adjusted undervaluation. On forward earnings alone, ChipMOS TECHNOLOGIES Inc. (IMOS) trades at 0. 8x forward P/E versus 34. 4x for Amkor Technology, Inc. — 33. 6x cheaper on a one-year earnings basis.

All stocks in this comparison pay dividends.

ChipMOS TECHNOLOGIES Inc. (IMOS) offers the highest yield at 1. 9%, versus 0. 5% for Amkor Technology, Inc. (AMKR).

For long-horizon retirement investors, ChipMOS TECHNOLOGIES Inc.

(IMOS) is the stronger choice — it scores higher on the combination of lower volatility, dividend reliability, and long-term compounding (1. 9% yield, +301. 1% 10Y return). Amkor Technology, Inc. (AMKR) carries a higher beta of 2. 87 — meaning larger drawdowns in market downturns, which matters significantly when you cannot wait years for a recovery. Both have compounded well over 10 years (IMOS: +301. 1%, AMKR: +1222%), 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.

IMOS pays a dividend while AMKR does not, making them suitable for different income and tax situations. 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.