Following a 16 per cent slump yesterday, emerging markets-focused bank Standard Chartered was leading the risers today. It was revealed yesterday that a US banking regulator accused it of collusion with the government of Iran to hide transactions from authorities. Rio Tinto, the mining and resources giant, jumped after managing to beat market expectations on earnings in the first half. Mining peers Fresnillo, Randgold and Xstrata were also making gains.Engineering group GKN was a heavy faller after going ex-dividend - from today, investors will not have the right to the group's latest dividend. International Airlines Group was also down after its Iberia airline business hedged its 6.66% stake in technology firm Amadeus with Nomura International in an effort to safeguard its holding. Smiths Group, the biggest faller on the benchmark, is off after a downgrade from Bank of America to underperform from neutral.Intercontinental Hotels Group for its part has received a downgrade from JP Morgan, to neutral from overweight.AstraZeneca is falling 2% after halting further development of its AZD9773 treatment for severe sepsis. Coincidentally, Jefferies has today issued a research note reiterating its hold recommendation on shares of AstraZeneca, saying: "shares will likely continue to trade in a "bond-like" fashion in our view as investors await the appointment of a permanent chief executive officer. Even then we believe that it will take a surprise from the R&D pipeline or incremental bolt-on acquisitions to change market perceptions of the company. For now a 6% yield seems like a solid floor for the company and we reiterate our Hold rating."FTSE 100 - RisersStandard Chartered (STAN) 1,336.50p +8.79%Rio Tinto (RIO) 3,194.00p +2.03%Croda International (CRDA) 2,427.00p +1.59%Xstrata (XTA) 910.60p +1.53%Fresnillo (FRES) 1,552.00p +1.44%Randgold Resources Ltd. (RRS) 6,170.00p +1.40%Bunzl (BNZL) 1,151.00p +1.32%Babcock International Group (BAB) 894.50p +0.79%Glencore International (GLEN) 339.00p +0.71%Aviva (AV.) 316.20p +0.70%FTSE 100 - FallersSmiths Group (SMIN) 1,075.00p -3.41%Vedanta Resources (VED) 976.00p -3.08%Pennon Group (PNN) 731.00p -2.99%International Consolidated Airlines Group SA (CDI) (IAG) 152.30p -2.75%ICAP (IAP) 327.10p -2.71%InterContinental Hotels Group (IHG) 1,679.00p -2.67%AstraZeneca (AZN) 3,001.50p -2.64%Serco Group (SRP) 577.50p -2.45%GKN (GKN) 214.90p -2.05%BT Group (BT.A) 220.20p -1.87%NR