Every time interest rates rise, financial media reaches for a story about "growth stocks falling out of favour," as if it's a matter of taste. It isn't. It's arithmetic, and understanding the arithmetic tells you a lot more than the sentiment narrative does — including which specific kinds of companies get hit hardest and why.
A DCF valuation is a bet on when the cash arrives
A discounted cash flow valuation adds up a company's future cash flows, each one shrunk by a discount factor that grows with how far away it is. Push the discount rate up — which is exactly what happens when the risk-free rate rises — and every future cash flow shrinks, but not equally. A cash flow arriving next year barely moves. A cash flow arriving in year fifteen shrinks dramatically, because that discount factor compounds over all fifteen years.
Try it yourself: our DCF valuation model lets you hold every assumption fixed except the discount rate and watch the sensitivity table shift in real time.
Why this hits growth companies specifically
A mature, profitable company generates most of its value from cash flows in the next few years — the near-term ones that barely move when rates rise. A young, fast-growing company (very often unprofitable today, on purpose, reinvesting everything into growth) generates almost all of its value from cash flows far in the future, once the growth story plays out. That's a portfolio of long-duration cash flows, in the same sense a 30-year bond has more interest-rate sensitivity than a 2-year one — and it takes the same kind of hit when the discount rate moves.
The cost of capital compounds the effect
It's not just the risk-free rate. A company's full discount rate is built from a risk-free rate plus a risk premium — see our WACC calculator for exactly how that's constructed. Riskier, less-proven businesses already carry a higher risk premium on top of the risk-free rate; when the risk-free rate itself rises, that higher premium gets applied to a bigger number, compounding the sensitivity further.
What this actually means in practice
It doesn't mean growth investing is wrong, or that rate-sensitive companies are bad businesses — it means their valuation carries more interest-rate risk than their operating business does, and that's worth separating in your head. A company can be executing perfectly and still see its valuation compress hard purely because the discount rate environment shifted underneath it. Recognising that distinction — operating performance versus valuation mechanics — is the difference between panicking at a falling share price and understanding exactly what moved and why.