American Industrial Partners, a middle-market private equity firm, announced it has acquired the U.S. operating subsidiaries of Hampson Industries.

SK Capital signed an asset purchase agreement to acquire the Antioxidant and UV Stabilizer Solutions business of Philadelphia-based Chemtura. The transaction is valued at approximately $200 million and is expected to close at the end of 2012 or early 2013.

Tool manufacturer Apex Tool Group is in discussions with Goldman Sachs and Barclays for a $1.475 billion credit facility to support the company

The Riverside Company has acquired Midnite Air (d/b/a MNX), an asset-light provider of third-party transportation and logistics services. Madison Capital and Bank of Montreal provided senior financing, and Babson Capital Management provided mezzanine financing.

Stifel Financial and KBW have entered into a definitive merger agreement to create the premier middle-market investment bank with a specialized focus on the financial services industry.

MetLife announced an agreement to sell its $70 billion mortgage servicing portfolio to JPMorgan Chase. The insurer was advised on the deal by K&L Gates, Milestone Advisors and Deutsche Bank Securities.

After six years of ownership, Sentinel Capital Partners sold Interim HealthCare, a home healthcare services franchisor. During its ownership, Sentinel transformed Interim from a franchisor and direct provider of healthcare services into a “pure-play” healthcare franchisor.

The Sterling Group announced that its affiliated investment fund Sterling Group Partners III acquired the Dexter Axle business from Tomkins Industries. BNP Paribas provided senior debt financing and Hancock Capital Management and Fifth Street Capital provided mezzanine debt.

First Investors Financial Services Group announced that its merger with an affiliate of Aquiline Capital Partners has been completed.

Hitachi Capital America said that it has acquired the assets and operations of Michigan-based Hennessey Capital, which will operate as a division of Hitachi Capital America to further improve its capability of providing asset-based lending and factoring to businesses nationwide.