Up 175% in a year, is this why the Sigma share price is falling this week?

The Sigma Healthcare Ltd (ASX: SIG) share price is deep in the red today.

Shares in the S&P/ASX 200 Index (ASX: XJO) healthcare stock – which owns chemists including Amcal, Discount Drug Stores, and Guardian Pharmacy – closed down 2.5% yesterday at $2.78. In…