Growth investing

Definition

Growth investing pays present prices for future scale: the thesis that a minority of companies compound revenues and earnings so far beyond consensus expectations that today’s apparently expensive multiple is retrospectively cheap. Fisher’s founding method — scuttlebutt research into product runway, management quality, and reinvestment ability — is a qualitative durability investigation, not a license for any price. The style’s honest tension: the cross-sectional evidence (Fama-French) shows expensive stocks UNDERPERFORM cheap ones on average, so growth investing’s claim is explicitly about selecting the exceptional minority that beats that base rate.

How it works / structure

• The Fisher method: fifteen-point qualitative checklist — product/market runway (“can sales grow for years?”), R&D productivity, margin trajectory, management candor and depth (qualitative-analysis machinery), sell rules built on thesis deterioration, not price targets (“almost never” sell a compounder that keeps qualifying).
• The arithmetic reality: a growth thesis is a duration position (fa-dcf-valuation — value concentrated in far-dated cash flows), which makes the style structurally rate-sensitive (episode-rates-shock-2022: the 2022 growth drawdown was discounting arithmetic, not execution failure) and expectation-sensitive (fa-guidance-estimates — the revision cycle is the style’s price engine).
• The base-rate problem (carried honestly): low book-to-market cohorts underperform on average (Fama-French); persistence studies show high growth rarely persists as long as prices imply — the style’s edge claim lives entirely in SELECTION (identifying durable compounders early) and is graded per-name, not per-cohort.
• Engine-relevant parameters: growth-durability falsifiers (revenue growth floors, NRR for software — fa-sector-saas, unit-economics trends), valuation guardrails (the GARP boundary — style-garp), and the deterioration sell rule (metric breach, not drawdown, triggers exit).

When it applies

Sectors with genuine long runways (the style’s habitat — technology, secular-shift beneficiaries); expectation- revision regimes (upgrades compound the multiple AND the estimate — the double engine); paired with momentum overlays (strategy-momentum — the documented co-movement of growth and momentum cohorts).

Risk profile & failure modes

• Paying for the base rate (the signature failure): buying the cohort’s story at the cohort’s price gets the cohort’s documented underperformance — selection is the entire claim; without a falsifiable durability case, growth buying is expensive indexing.
• Duration shocks: rate regimes reprice the whole style independent of execution — the macro overlay is structural (regime-rate-environments).
• Narrative capture: growth stories resist disconfirmation (bias-anchoring on the original thesis; the metric-breach sell rule exists because narratives outlive their numbers).
• Growth-trap symmetry: as value has traps, growth has decelerations — the first sub-guidance quarter of a priced-for-persistence name is the style’s documented loss concentrator.

Evidence & limits

Fisher (1958) is the founding method; Fama-French (1992) carries the cohort base rate the style must beat; growth- persistence studies document how rarely implied growth realizes. The style’s validity is therefore conditional and per-name — carried as a selection discipline with explicit falsifiers, never as cohort faith.

Falsifiable-thesis examples

Illustrations only, not signals:

• “X sustains 25%+ revenue growth with stable unit economics for the next 8 quarters (durability thesis); any two consecutive sub-20% quarters falsify” — graded on the filings.
• “X’s implied growth (reverse DCF) is below its trailing 3-year realized growth (expectations-gap entry condition)” — falsified by the implied-path computation.

Cross-references

• The valuation arithmetic: fa-dcf-valuation (duration), fa-guidance-estimates
• The guardrail sibling: style-garp; the sector exhibit: fa-sector-saas
• The macro overlay: episode-rates-shock-2022, regime-rate-environments
• The co-moving overlay: strategy-momentum