Cutting Losses vs. Holding Conviction: How to Know the Difference

I made a mistake three years ago that taught me the only rule I still follow.

I owned a software company. Profitable. Honest management. Reasonable valuation. Then earnings came in: revenue flat, margin compressed, two top engineers left. The stock dropped 22% in a week. Everyone I trusted told me to cut and move on.

I held. Not out of conviction. Out of hope. Out of "it will bounce back." Out of sunk cost. Six months later it was down 45%. I sold everything. It was the wrong decision — the company recovered, and the stock went to 2.8x. I didn't make the money because I couldn't separate a thesis change from a bad week.

The opposite happened two years ago. A position I loved — excellent founder, massive TAM, early product-market fit — missed guidance by 3 cents per share. 18% drop. But the miss was a timing issue, not a business collapse. I held. It went down another 12%, then recovered to up 67% in eighteen months.

Same downward move. Opposite outcomes. What's the difference?

The thesis.

The Wrong Question

Most investors ask: "Should I hold or sell?" That is the wrong question. It comes too late. It comes when emotion is running the show.

The right question is asked before you buy: "What would break this thesis?" You write it down. Not in your head. On a piece of paper or in a note app. You specify the exact events that would make you wrong.

The software company had a thesis: "Growing faster than the industry, retaining talent, maintaining margins." When the earnings miss proved all three were failing, the thesis was broken. That wasn't hope talking. That was data. The price drop was irrelevant — the business changed.

The second company's thesis was: "Build a defensible product in a massive market with a founder who ships." Missing one quarter by a timing issue didn't break that thesis. The founder still shipped. The market was still there. The business was still defensible. The price drop was noise.

How I Think About It Now

The only rule I follow is: write down the thesis before you enter, review it when the move hurts.

Not when it hurts a little. When it hurts enough that you're considering selling. That's the moment the thesis document becomes the only thing that matters.

Broken thesis signals:

The business fundamentals changed (margins, growth, cash flow, competitive position)
The founder or management team changed materially
The market for the product disappeared or contracted structurally
New competitors or technology rendered the thesis obsolete
Regulatory or macro environments changed the economics permanently

Price discomfort signals:

The market repriced the same thesis at a lower valuation
An earnings miss came from timing, not deterioration
A rival got headline news that temporarily moved money away
Macro fear spread (rate shock, recession fears, sector rotation)
You missed entry better, but the thesis is still intact

The Pre-Entry Note

Every position I take, I write three sentences:

What is the thesis? One clean sentence: the reason I own this.
What would prove me wrong? Specific events or metrics — not vague "if it goes down" statements.
What is my mental exit price? Not a hard stop — a price at which I'll review the thesis, not follow it blindly.

When I'm Wrong vs. When I'm Uncomfortable

When the thesis breaks, you feel relief when you finally sell. You've been fighting against the data. Selling is a return to clarity.

When you're just uncomfortable, you feel regret when you sell. You know the business is still intact. You're just frustrated about being down. Selling feels like surrender to emotion.

The Sunk Cost Trap

The hardest part is resisting the sunk cost fallacy. You bought at $120, now it's $95, and you keep thinking "I'll just wait until $115 to get even."

That thinking is backwards. The price you paid is gone. The only question is: if you had $95 in cash right now, would you buy this position?

If yes — hold (thesis intact). If no — sell (thesis is likely broken).

The Rule

Before you buy — write down the thesis and the signals that break it.
When you're down 15–20% — read the thesis. Breaking signals present? Cut. If not, hold.
At down 30%+ — review again. Did fundamentals change, or is the market repricing risk?
Never sell because the price went down. Sell because the thesis broke.

This rule has saved me from two categories of losses: holding broken theses too long, and selling intact theses during price spasms.

I'm still learning. But the thesis document is the only thing I've found that separates conviction from hope.

And hope is expensive.

— Ruslan Averin