Bazaarvoice Inc., an Austin, Texas-based provider of hosted social commerce solutions, plans to offer around 9.48 million common shares at between $8 and $10 per share. It would have an initial market cap of approximately $512 million, were it to price in the middle of its range. The company plans to trade on the Nasdaq under ticker symbol BV, with Morgan Stanley, Deutsche Bank Securities and Credit Suisse serving as co-lead underwriters. Shareholders include Austin Ventures (34.1 pre-IPO stake), Barry Ventures (14.3%), Eastern Advisors (10.6) and First Round Capital. It reports an $18 million net loss for the nine months ending January 31, 2012, on around $74 million in revenue. www.bazaarvoice.com

Ceres Inc., a Thousand Oaks, Calif.-based seller of seeds to produce renewable biomass feedstocks, plans to offer five million common shares at between $21 and $23 per share. It plans trade on the Nasdaq under ticker symbol CERE, while Goldman Sachs and Barclays Capital are serving as co-lead underwriters. The company reports at $36 million net loss for the 12 months ending August 31, 2011, on around $6.6 million in revenue. Shareholders include Warburg Pincus (15.56% pre-IPO stake), Oxford Bioscience Partners (10.65%), Oppenheimer Growth (8.46%) and Monsanto Co. (6.41%). www.ceres.net

Proto Labs Inc., a Maple Plain, Minn.-based maker of custom parts for prototyping and short-run production, plans to offer 4.3 million shares at between $13 and $15 per share. The company would have an initial market cap of approximately $325 million, were it to price in the middle of its range. It plans to trade on the NYSE under ticker symbol PRLB, with Jefferies and Piper Jaffray serving as co-lead underwriters. North Bridge Growth Equity holds a 31.7% pre-IPO stake. It reports $18 million in net income for 2011 on around $99 million in revenue. www.protolabs.com

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