SoftBank Corp. of Japan has agreed to acquire a 51% stake in Helsinki-based mobile gaming company Supercell, for approximately $1.53 billion. Earlier this year, Supercell raised $130 million early this year at a $770 million valuation. Investors included Venture Partners, Atomico, Index Ventures, Accel Partners, Cerval Investments, Initial Capital, Lifeline Ventures and London Venture Partners. No word yet on if any of the VC firms will exit via this new transaction. www.supercell.com
Aratna Therapeutics Inc. (Nasdaq: PETX) has agreed to acquire Vet Therapeutics Inc., a San Diego-based developer of an antibody-based biologics platform for the pet care market. No financial terms were disclosed.www.aratana.com
MedImmune, a unit of AstraZeneca (LSE: AZN), has acquired Spirogen, a London-based developer of DNA minor groove-binding molecules for the therapeutic treatment of cancers. The deal is valued at upwards of $440 million, including a $200 million up-front cash payment and $220 million in milestone-based payments. Sellers include Auven Therapeutics, Bloomsbury Bioseed Fund, Cambridge Enterprise Seed Funds, RCT Ventures and ETCapital. www.medimmune.com
St. Jude Medical Inc. (NYSE: STJ) has acquired Nanostim Inc., a Milpitas, Calif.–based provider of miniaturized, leadless pacemakers. No financial terms were disclosed. Nanostim had raised VC funding from Emergent Medical Partners, InterWest Partners, Life Science Angels and US Venture Partners. www.nanostim.com
BlueScope Steel (ASX: BSL) has paid approximately A$23 million to acquire the OneSteel sheet and coil processing and distribution business of Arrium Ltd. No financial terms were disclosed.www.bluesteel.com
Hexagon (Oslo: HEXA) has offered to acquire Veripos (Oslo: VPOS), a Norway-based maker of positioning system hardware for offshore oil companies, for approximately $152 million.www.hexagon.se
The Scotts Miracle-Gro Co. (NYSE: SMG) has agreed to acquire the Tomcat consumer rodent control business of Bell Laboratories Inc. No financial terms were disclosed. www.scotts.com
SIIC Environment Holdings Ltd., a Singapore-listed water treatment company focused on China, is raising approximately US$209 million by selling 3.1 billion ordinary shares (13% discount to Oct. 10 price) to investors like CIC and RRJ Capital. www.asiawatertech.com
Yandex (Nasdaq: YNDX) has acquired KinoPoisk, a Russian-language website about movies. No financial terms were disclosed. www.kinopoisk.ru
Aerie Pharmaceuticals, a Bridgewater, N.J.-based developer of glaucoma treatments, has set its IPO terms to 5.25 million shares being offered at between $12 and $14 per share. It plans to trade on the Nasdaq under ticker symbol AERI, with RBC Capital Markets and Stifel serving as lead underwriters. The company has raised over $60 million in VC funding from Alta Partners (27.17% pre-IPO stake), TPG Ventures (21.17%), Clarus Ventures (21.85%), Sofinnova Ventures (19.35%) and Osage Ventures. www.aeriepharma.com
CVC Brasil Operadora e Agencia de Viagens, a Brazilian travel agency controlled by The Carlyle Group, is prepping an IPO that could come later this year, according to LBO Wire. www.cvc.com.br
ISS, a Danish cleaning and catering company owned by EQT Partners and Goldman Sachs, told the FT that it continues to prepare for an IPO, but that the floatation will not come in 2013. More likely would be a Copenhagen offering next year, possibly dual-listed in London. www.issworld.com
Moncler, an Italian high-end clothing and accessories company, has filed papers to go public in Milan. Prior reports suggested that the company plans to raise of €800 million, with Bank of America and Goldman Sachs leading the underwriting group. Shareholders include The Carlyle Group, Eurazeo, IDInvest Partners, Omnes Capital and Progressio SGR. www.moncler.com
Sign up for Dan Primack’s daily email newsletter on deals and deal-makers: GetTermSheet.com
