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It sold 63 million euros of 18-month bills at a yield of minus 0.37 percent, unchanged from the previous auction of such bills in October.
It also sold 57 million euros of six-month bills at a yield of minus 0.39 percent, the same as in the March auction, while the yield on three-month bills reached minus 0.4 percent, versus minus 0.39 percent last month.
Analysts said yields are likely to remain negative in coming months, mainly due to European Central Bank's expansive monetary policy.
Total bids amounted to 368 million euros. The next T-bill auction is due on May 14.