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One-year paper, which last auctioned for a yield of -0.374 percent in January, fell to -0.423 percent.
Three-month treasury bills, the most regularly auctioned maturity, were sold for a yield of -0.374 percent, broadly unchanged from the -0.379 percent previously.
Belgium has received, rather than paid interest on its short-term borrowings for some 18 months.
The amount raised was at the top of the 2.2 to 2.6 billion euros range the agency had set earlier.