The Sri Lankan rupee ended slightly firmer on Wednesday as banks sold dollars on behalf of foreign investors and as exporters sold the greenback amid a lack of demand from importers for the US currency, dealers said. The spot rupee ended at 145.40/45 per dollar, slightly firmer compared with Tuesday's close of 145.43/48. One-week rupee forwards ended at 145.65/70, compared with the previous day's close of 145.60/70. The spot rupee is usually managed by the central bank, and market participants use the forward market levels for guidance on the currency.