LONDON -- The FTSE 100 (INDEX: ^FTSE) hit a crushing low of 4,944 on Oct. 4, 2011, but has since recovered to reach a 52-week high of 5,966 points on March 16 this year. At around 5,660 right now, it still has a way to go to regain that, but it'll get there someday -- let's just hope it doesn't hit any new lows first.

Meanwhile, individual companies on the FTSE index are always hitting high and low points. Here are three that have been crushed by the markets this month.

Mecom Group
(LSE: MEC.L) saw its shares crash last month after the pan-European publisher released a profit warning -- the price fell by half to 72 pence on June 6. The warning told of a serious deterioration in the company's advertising revenues, citing eurozone economic woes as a leading cause.

The shares went on to end the month at 69 pence, but they've fallen even further this month. In July so far, the price is down by another 24% to 52.3 pence, with no sign of an upturn coming anytime soon.

Shares in the Finland-based nickel and zinc miner Talvivaara (LSE: TALV.L) are down 22% on the month so far, falling to 134 pence from a June close of 171.5 pence. The latest slump started after a poor second-quarter production report, which told of productivity being hit by flooding and by a fatality in April.

The current downturn reversed what was starting to look like a recovery from a longer-term decline -- the shares are now down 67% over the past 12 months, hit partly by the sell-off of mining shares.

Another company suffering from poor European trading is Kesa Electricals (LSE: KESA.L), the ex-owner of the U.K.'s Comet high-street chain. The shares, which have been sliding for some time, are 18.7% down on the month so far, at 40.25 pence.

Kesa, the owner of the French Darty chain and other European outlets, has seen its shares slump by 70% over the past 12 months, though recent predictions of a return to slow growth for Europe might make it worth a closer examination now.

Finally, if you're in the market for FTSE shares that should not provide nasty surprises, then "8 Shares Held By Britain's Super-Investor" may be for you. In this free report, we've analyzed the 20 billion pound portfolio of legendary City fund manager Neil Woodford. Click here now to discover his favorite large caps with high dividends and steady growth potential. But hurry -- the report is free for a limited time only.

Are you looking to profit as a long-term investor? "10 Steps to Making a Million in the Market" is the latest Motley Fool guide to help Britain invest. Better. We urge you to read the report today -- while it's still free and available.

Further Motley Fool investment opportunities: