* FTSE 100 set for fifth day of gains
* Citigroup results eyed, BoA posts lower quarterly profit
By Tricia Wright
LONDON, July 17 (Reuters) - London's top share index rose at midday on Friday, on track for a fifth straight day of gains, boosted by oils, miners and banks, as investors cautiously await results from Citi <C.N>.
By 1145 GMT the FTSE 100 <
> was up 20.50 points or 0.5 percent at 4,382.34, set for its biggest weekly rise since January after hitting a four-week high in the previous session.Bank of America <BAC.N> became the next in a line of U.S. companies unveiling second-quarter earnings, in the wake of strong results from IBM <IBM.N>, Intel <INTC.O>, Goldman Sachs <GS.N> and JPMorgan Chase <JPM.N>.
It posted a lower quarterly profit, hurt by a surge in troubled loans as more credit card and mortgage customers fell behind on payments.
"The (BoA) results look better, but that's in large part due to cost cutting as they've lost baggage, which just shows they were rather flabby before," said Philip Gillett at IG Index.
Citigroup's <C.N> earnings should provide the focus this afternoon.
Energy stocks added the most points to the FTSE 100 index, as crude prices remained above $61 a barrel <CLc1>.
BG Group <BG.L>, BP <BP.L>, Cairn Energy <CNE.L> and Royal Dutch Shell <RDSa.L> added between 0.9 and 2.2 percent.
Mining stocks also enjoyed a rally. ENRC <ENRC.L> was the biggest blue-chip gainer, up 5.5 percent, with Anglo American <AAL.L>, BHP Billiton <BLT.L>, Kazakhmys <KAZ.L> and Rio Tinto <RIO.L> adding 0.8-2.6 percent.
Vedanta Resources <VED.L> rose 3.5 percent after the India-focused group said it planned to expand to steel manufacturing with a partner, and boosted as Deutsche Bank lifted its price target on the company to 1,440 pence from 1,419 pence.
Banks were also in positive territory, buoyed by strong earnings from U.S. peers. Barclays <BARC.L>, HSBC <HSBA.L> and Royal Bank of Scotland <RBS.L> rose 1.1-1.9 percent.
British Airways <BAY.L> also made progress, up 3.4 percent, as the market responded well to plans by the airline to raise around 600 million pounds through a combination of bondholder debt and bank credit. [
]BA also reported an operating loss of 100 million pounds for the three months ending June 30, but analysts said this was better than feared.
On the downside, Severn Trent <SVT.L> fell 1.8 percent as Morgan Stanley cut its recommendation on the water company to "underweight" from "equal weight".
A broker downgrade also weighed on distribution group Bunzl <BNZL.L>, off 1.4 percent, as Banc of America-Merrill Lynch downgraded its stance on the firm to "neutral" from "buy".
Elsewhere, engineering firm Invensys <ISYS.L> fell 2.2 percent, as it said reduced volumes in its short-cycle products would impact first half performance. [
]Defensive tobacco and pharmaceutical stocks were also lower, with Imperial Tobacco <IMT.L> and GlaxoSmithKline <GSK.L> down 0.6 percent and 0.8 percent, respectively.
"Cyclicals and defensives are significantly undervalued at current levels, so the market should be able to establish more breadth in this quarter than we saw in the first half of the year," said Darren Winder, head of macro and strategy research at Cazenove.
"Cyclicals... are relatively small in the context of the index, so it's really these big, large cap defensive names that need to make some progress to take us to 4,500 and beyond," he added. (Editing by Mike Nesbit)