There are details in their 2012-2013 Annual Plan PDF: https://wikimediafoundation.org/w/index.php?title=File:2012-13_Wikimedia_Foundation_Plan_FINAL_FOR_WEBSIT

There are details in their 2012-2013 Annual Plan PDF: https://wikimediafoundation.org/w/index.php?title=File:2012-13_Wikimedia_Foundation_Plan_FINAL_FOR_WEBSITE.pdf&page=56 https://wikimediafoundation.org/w/index.php?title=File:2012-... For example, on pp. 54-58, we see that their 2012-2013 plan expects to spend around $42 million, of which about $17.5 million goes to "Engineering". The largest area within engineering, about $6 million, is "Core Site Ops". The plan is for staffing to rise from 119 to 174 people over the year of the plan.