Silicon Valley and other tech hubs are losing the tech talent war.

Metro areas that consistently attracted huge numbers of tech workers have hit a turning point, according to fresh data from labor-market analytics firm Lightcast, crunched by D.C. think tank Brookings. The share of the nation’s tech workers who work in places such as Silicon Valley, San Francisco, Boston, New York, Los Angeles and the greater Washington, D.C. area is actually shrinking.