The Art Newspaper did a little buyer spotting in London:

• Nahmad family acquiring Lucio Fontana’s Concetto Spaziale, Attese, 1965, for £1.2m (lot 13, est. £600,000-£800,000) and two works by Alexander Calder (lot 21 and 24, Two Fish Tails, 1975, and Black and Yellow Dots in the Air, 1960, both for £1.4m)
• Mugrabi family […] left [Phillips de Pury] straight after purchasing Tom Wesselmann’s Study for Pat nude, 1979, for £159,650 (est £150,000-£200,000).
• [Siebe] Tettero bought Patrick Heron’s October Horizon: October 1957, 1957, for £481,250 (est £250,000-£350,000, lot 31). He had also earlier acquired Heinz Mack’s No.7, 1958-59, for £145,250 (est £60,000-£80,000, lot 16), both on behalf of private clients.
• Kim Heirston: picked up Jeff Koons’ Bear (Gold), 1999 (lot 43) at Sotheby’s earlier in the week for £385,250, a hammer price below it’s low estimate (£350,000, hammer price £320,000) as well as Anselm Reyle’s Untitled, 2006, from Phillips de Pury for £99,650 (est £70,000-£90,000,

In London Contemporary Sales, Who Dares, Wins (The Art Newspaper)