There has been an uptick in interest lately from activist investors looking to take advantage of stocks trading at depressed levels. Activists made their presence felt again on Monday morning as one well-known financial institution in the space took a position in cloud computing pioneer Salesforce ( CRM 7.54% ). However, the gains for Salesforce stock were small compared to what shareholders in Evoqua Water Technologies ( AQUA ) enjoyed. Read on to learn everything you need to know about both stocks.