PSNL vs TMO

For growth investors, Thermo Fisher Scientific Inc.

(TMO) is the stronger pick with 3. 9% revenue growth year-over-year, versus -100. 0% for Personalis, Inc. (PSNL). Thermo Fisher Scientific Inc. (TMO) offers the better valuation at 26. 7x trailing P/E (19. 0x forward), making it the more compelling value choice. Analysts rate Personalis, Inc. (PSNL) a "Buy" — based on 12 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.

Over the past 5 years, Thermo Fisher Scientific Inc.

(TMO) delivered a total return of +2. 1%, compared to -71. 8% for Personalis, Inc. (PSNL). Over 10 years, the gap is even starker: TMO returned +229. 1% versus PSNL's -78. 7%. 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), Thermo Fisher Scientific Inc.

(TMO) is the lower-risk stock at 1. 10β versus Personalis, Inc. 's 2. 75β — meaning PSNL is approximately 151% more volatile than TMO relative to the S&P 500. On balance sheet safety, Personalis, Inc. (PSNL) carries a lower debt/equity ratio of 12% versus 76% for Thermo Fisher Scientific Inc. — giving it more financial flexibility in a downturn.

By revenue growth (latest reported year), Thermo Fisher Scientific Inc.

(TMO) is pulling ahead at 3. 9% versus -100. 0% for Personalis, Inc. (PSNL). On earnings-per-share growth, the picture is similar: Personalis, Inc. grew EPS 33. 6% year-over-year, compared to 7. 3% for Thermo Fisher Scientific Inc.. 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.

Thermo Fisher Scientific Inc.

(TMO) is the more profitable company, earning 15. 1% net margin versus -155. 4% for Personalis, Inc. — meaning it keeps 15. 1% of every revenue dollar as bottom-line profit. Operating margin tells a similar story: TMO leads at 18. 2% versus -168. 4% for PSNL. At the gross margin level — before operating expenses — TMO leads at 37. 7%, 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.

Analyst consensus price targets imply the most upside for PSNL: 85.

3% to $11. 25.

In this comparison, TMO (0.

4% yield) pays a dividend. PSNL does not pay a meaningful dividend and should not be held primarily for income.

For long-horizon retirement investors, Thermo Fisher Scientific Inc.

(TMO) is the stronger choice — it scores higher on the combination of lower volatility, dividend reliability, and long-term compounding (low volatility (β 1. 10), +229. 1% 10Y return). Personalis, Inc. (PSNL) carries a higher beta of 2. 75 — meaning larger drawdowns in market downturns, which matters significantly when you cannot wait years for a recovery. Both have compounded well over 10 years (TMO: +229. 1%, PSNL: -78. 7%), 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 Healthcare sector, making this a peer-level intra-sector comparison — the same macro tailwinds and headwinds will affect both.

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.