The index effect is real, but is it lasting?The latest news item published by an influential financial-services company had a very positive knock-on effect on Hamilton Lane (HLNE 4.22%) shares Monday. The stock of the under-the-radar financial-services provider leaped more than 4% higher on the day as a result, easily topping the 1.2% gain of the S&P 500 index.Index advancementAfter market hours on Friday, S&P Global's S&P Dow Jones Indices unit announced the latest set of changes to several of its stock in ...