Quarterly review due in weeks Four likely winners and losersA further three stocks could drop outWe may only be half-way through the third quarter, but already it looks as though there will be quite a few changes to the benchmark FTSE 100 index when the topic comes up for review next month.Promotion to, and demotion from, the index can have a big effect on the share prices of the firms...

- Profit upgrade not a big surprise- Like-for-like sales slowing sharply- Analyst see long-term threat from AmazonIndustrial and electronic products maker RS Group (RS1), formerly known as Electrocomponents, delivered an upbeat full-year trading update including a better-than-expected profit outturn.However, the shares were the worst performers in the blue-chip FTSE 100 benchmark, sinking 4.4%...

Essentra (ESNT) 211pLoss to date: -32%Shares in industrial group Essentra (ESNT) jumped as much as 15% on 3 October on news the firm had agreed the sale of its filters business, completing its strategic repositioning.Unfortunately, that still leaves them almost a pound below our 310p entry point in November 2021 despite the fact the firm has done exactly what it said it would.WHAT'S HAPPENED...