Cadence Design Systems Inc. will join the S&P 500 index before the market opens on Sept. 18, according to S&P Dow Jones Indices late Friday. San Jose, Calif.-based Cadence, which makes chip-design software, will replace Staples Inc. [s; spls] on the index. Shares of Cadence declined 0.6% to $38 after hours. In late June, Staples agreed to be acquired by private-equity firm Sycamore Partners for $6.9 billion.
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