Assurant Inc. (NYSE: AIZ) has acquired the field asset services business of FirstService Corp.(Nasdaq: FSRV) for $55 million in cash. www.assurant.com

Nielsen Holdings NV (NYSE: NLSN) has completed its previously-announced $1.26 billion acquisition of Arbitron Inc. (NYSE: ARB). Major Nielsen shareholders include The Blackstone Group, THL Partners, The Carlyle Group, KKR and Hellman & Friedman. www.nielsen.com

Astronics Corp. (Nasdaq: ATRO) has acquired certain assets and liabilities of AeroSat Corp., an Amhest, N.H.-based provider of aircraft antenna systems, for upwards of $32 million (including a $12m up-front cash payment). AeroSat shareholders include CAI, NextLevel Venture Partners, PAR Capital Management and AeroEquity. www.astronics.com

Choose Energy, a Plano, Texas-based company that helps educate consumers on their options for residential electricity, has acquired Power2Switch, a Chicago-based online comparison engine for energy rates and an automated process for switching to a new electricity supplier. No financial terms were disclosed. Choose Energy is a portfolio company of Kleiner Perkins Caufield & Byers and Stephens Capital Partners, while Power2Switch was seeded by OCA Ventures, Hyde Park Angels, New World Ventures and I2A. www.power2switch.com

Experian PLC (LSE: EXPN) has agreed to acquire The 41st Parameter, a Scottsdale, Ariz.–based provider of device recognition solutions for fraud prevention and online audience identification. The deal is valued at $324 million. The 41st Parameter has raised around $38 million in VC funding, from Kleiner Perkins Caufield & Byers, Georgian Partners, Northwest Venture Partners and Jafco Ventures.www.the41.com

TellApart, a Burlingame, Calif.–based provider of personalized marketing solutions for omnichannel commerce, has acquired AdStack, a San Francisco–based provider of email marketing optimization solutions. No financial terms were disclosed. TellApart has raised over $17 million in VC funding from firms like Greylock Partners and Bain Capital Ventures, while AdStack was seeded by Harrison Metal Capital. www.tellapart.com

Antero Resources, a Denver-based oil and gas exploration and production company controlled byWarburg Pincus, has set its IPO terms to 30 million shares being offered at between $38 and $42 per share. It plans to trade on the NYSE under ticker symbol AR, with Barclays, JPMorgan and Citigroup serving as lead underwriters. www.anteroresources.com

The Container Store Inc., a Coppell, Texas-based retailer owned by Leonard Green & Partners, has filed for a $200 million IPO. It plans to trade on the NYSE under ticker symbol TCS, with J.P. Morgan, Barclays and Credit Suisse serving as lead underwriters. The company reports $30 million of net income on $707 million in revenue for the fiscal year ending March 2, 2013.www.containerstore.com

Fate Therapeutics, a San Diego-based stem cell biotech company focused on cellfate control, has amended its IPO terms to 6.67 million shares being offered at between $6 and $8 per share, compared to earlier plans to offer 4 million shares at between $14 and $16 per share. It will trade on the Nasdaq under ticker symbol FATE, with Cowen & Co. and BMO Capital Markets serving as lead underwriters. The company reports a $9.1 million net loss on $762,000 in revenue for the first half of 2013. The company has raised over $42 million in VC funding from ARCH Venture Partners (16.8% pre-IPO stake), Polaris Partners (16.8%), Venrock (16.8%) and OVP Venture Partners (15.4%).www.fatetherapeutics.com

Poundland, a British single-price discount retailer backed by Warburg Pincus, is considering a floatation for the first half of 2014, according to Reuters. www.poundland.co.uk

Qunar, a Chinese travel search engine, has filed for a $125 million IPO. It plans to trade on the NYSE under ticker symbol QUNR, with Goldman Sachs (Asia) and Deutsche Bank Securities serving as co-lead underwriters. The company reports a $2.8 million net loss on $58 million in revenue for the first half of 2013. Shareholders include Baidu (61.05% pre-IPO stake), GSR Ventures (6.27%) and Hillhouse Capital. www.qunar.com

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