Datadog Inc. /zigman2/quotes/214127379/composite DDOG +0.76% shares sank 5% in after-hours trading Thursday after the data-analytics platform reported fourth-quarter earnings roughly in line with Wall Street expectations but forecast a loss in its current quarter. Datadog reported net income of $891,000, or break-even, in the quarter, compared with a loss of $6.6 million, or 9 cents a share, in the year-ago fourth quarter. Revenue propelled 85% to $113.6 million from $61.6 million a year ago. Analysts surveyed by FactSet had expected a loss of 4 cents a share on sales of $102.4 million. Datadog shares are up 28.4% over the last 12 months. The broader S&P 500 index /zigman2/quotes/210599714/realtime SPX -0.40% has gained 22.9% the last year.