Add Barclays to Wall Street’s positive turnaround on Palantir Technologies (PLTR), with analysts upbeat on both its defense business and commercial artificial intelligence marketing push. Palantir stock has gained nearly 12% in October and has now advanced 18% in 2026. Barclays on Oct. 8 initiated Palantir stock with an overweight rating. Goldman Sachs upgraded Palantir stock to buy the same…