(Reuters) -Chip designer Arm Holdings gave a fiscal first-quarter revenue forecast on Wednesday that beat Wall Street's expectations, but its full-year forecast was below expectations. Shares of Arm fell about 4% in extended trading after the report. For the current fiscal first quarter, Arm forecast revenue in a range between $875 million and $925 million, with a midpoint of $900 million, compared with an average analyst estimate of $857.5 million, according to LSEG data. Read this story