Pensions Investment Research Consultants compounded problems when it urged investors to call for Sir Ken Morrison's head.
The biggest reputation climber was Vodafone. The mobile phone operator took fourth position after doubling its full-year dividend and launching a £4bn share buy-back programme.
Another climber was William Hill, which came second after securing the buy-out of Stanley Leisure - the £504m deal makes it the UK's biggest bookmaker.
Oil company Regal Petroleum entered the chart for the first time in the second-worst position. The FSA was reported to be examining movements in the company's share price ahead of Regal's announcement that its main Greek oil well had been deemed 'non-commercial'.
Asda held onto third after a Daily Mirror survey found it offered the best value for money, while BT jumped into fifth following reports of a joint venture with Motorola to launch a handset that enables internet calls. Marks & Spencer came third from bottom in anticipation of poor results.
Reputation Monitor is compiled from Thomson Intermedia's National News Index, a measure of media sentiment that excludes stock market reports and passing mentions.
REPUTATION MONITOR - 17-23 MAY 2005
Ranking Rank last week Organisation NNI
1 1 Tesco 307.4
2 29 William Hill 177.7
3 3 Asda 171.8
4 174 Vodafone 150.3
5 57 BT Group 146.6
1 2 Morrisons -143.2
2 n/a Regal Petroleum -115.4
3 27 Marks & Spencer -111.7
4 1 MG Rover -109
5 7 Marconi Corporation -99.9
Source: www.newsmetrics.co.uk/Thomson Intermedia plc *Rank last week is
position from bottom of table