Shares of S1 ( SONE) were among technology's losers Monday, falling 10% after the software company announced a restructuring plan and warned that third-quarter results would fall below expectations. S1 expects to report a loss of 9 cents to 10 cents a share on sales of $57 million to $58 million. The loss forecast includes an estimated $3.5 million in charges related to the reorganization plan, which includes cutting 8% of the company's workforce and consolidating some facilities. The company said the plan is expected to reduce annual operating expenses by $20 million to $22 million. S1 plans to record charges totaling $14 million to $15 million over the third and fourth quarters related to the moves. The company now expects its financial institutions segment to report total third-quarter sales of $47 million to $48 million. Previously, S1 had predicted it would post total sales of $61 million to $64 million and financial institutions sales of $53 million to $55 million. Excluding charges, the company expects its financial institutions segment to post a loss of 4 cents to 5 cents a share, worse than its prior projection for break-even results to a loss of 3 cents a share. Analysts polled by Thomson First Call projected loss of 1 cent a share on sales of $63.3 million. RSA Security ( RSAS) fell 6% after the company narrowed its third-quarter forecast. The company, which makes digital security products, expects to report third-quarter earnings of 20 cents to 22 cents a share, including a benefit of 8 cents to 9 cents a share related to tax refunds. Previously, the company projected it would earn 11 cents to 14 cents a share, before any tax gains. RSA also narrowed its sales estimate to $76 million from a range of $74 million to $78 million. Analysts project earnings of 12 cents a share on sales of $75.8 million. RSA will post full third-quarter results on Oct. 27. Shares were trading down 69 cents to $11.51.