That's because the $12 billion wealth management firm is moving sideways in a range-bound trade called a rectangle. The setup gets its name because price action is essentially "boxed-in" by resistance above shares at $45, and support to the downside at $42. Instead of buying within the channel, rectangles are breakout trades - you want to trade this name when it breaks outside of the box.
That means that a move through the $45 level is a buy signal, and a move through support at $42 is an indicator that it's time to sell (or short) LNC. Right now, there's some extra bias to the upside - typically, rectangles are continuation patterns, and since Lincoln's preceding price action was up, it's likely next move is up as well. Still, it doesn't become a high probability trade until the breakout happens, so wait to get your direction from the market.