San Francisco-based Splunk, the developer of enterprise indexing software, has bumped its anticipated IPO pricing range, according to a filing from the firm. Splunk said it is now anticipating an offering of 13,500,000 shares of its stock at between $11.00 and $13.00 per share. The pricing range is above an earlier, estimated range of between $8.00 and $10.00 a share for its IPO, set earlier this month. Splunk hopes to trade on the NASDAQ Global Select Market as SPLK. The firm is venture backed by August Capital, Sevin Rosen, JK&B Capital, and Ignition Partners.