Secrecy has served Samsung Electronics well. Keeping its rivals guessing has helped Samsung, the South Korean technology giant, build a formidable lead in the smartphone industry, where it now sells more than one in three handsets worldwide.

This summer, however, Samsung suffered from an unusual loss of confidence among investors — caused partly by uncertainty over its strategy. Investors question what it intends to do with the $50 billion it has built up by selling all of those Galaxy S4's and Note 3's, and the chips in them. From early June through mid-July, Samsung's stock lost about one-fifth of its value.