The Ministry of Economy and Finance said it completed competitive auctions for both a new five-year Korea Treasury Bond and an existing five-year issue on Monday.
The 1.5 trillion won ($1.09 billion) pre-issuance tranche of the new five-year bond drew 3.581 trillion won in bids, equivalent to a bid-to-cover ratio of 238.7 percent.
Accepted yields ranged from 4.095 percent to 4.135 percent, with a weighted-average yield of 4.131 percent.
The 4-basis-point gap between the lowest and highest accepted yields resulted in what local bond traders call a "split," reflecting a relatively wide divergence in the prices investors were willing to accept for the same security.
A high bid-to-cover ratio by itself does not necessarily indicate strong underlying demand.
The ratio measures the amount of bids submitted relative to the securities offered, but does not show how aggressively investors were willing to price those bids.
Because bond prices move inversely to yields, investors bidding at lower yields are effectively willing to pay more for the debt, while those demanding higher yields are seeking a cheaper entry price.
A split therefore suggests that while the auction attracted enough orders to cover the full issuance, investors were less aligned over what constituted an appropriate price.
The result weighed on an earlier rally in Korean government bonds.
Foreign buying of three- and 10-year bond futures had supported the market earlier in the morning, but gains lost some momentum after the five-year auction produced the split.
At the morning session close, the five-year Korean government bond yield was down 1.4 basis points at 4.097 percent, while the 10-year yield fell 2.9 basis points to 4.347 percent.
The three-year yield, by contrast, edged up 0.2 basis point to 3.856 percent, leaving moves across the curve mixed.
The auction should not be read as a failed sale. The full amount was placed and bids exceeded the offered volume by more than two times.
Still, the spread in accepted yields and the partial reversal in the market's earlier gains pointed to caution over end-investor demand and the appropriate valuation of medium-term government debt.
The auction came three days before the Bank of Korea's monetary policy meeting on Thursday, with market expectations divided over whether policymakers will follow July's 25-basis-point rate increase with another hike.
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