The department is expected to announce around 11 a.m. ET the size of a buyback operation it announced Aug. 19.

The department is expected to announce around 11 a.m. ET the size of a buyback operation it announced Aug. 19.

The Treasury is expected to announce Wednesday how large it will make its bond buyback operations, with analysts at Wrightson ICAP seeing $5 billion to $6 billion as a likely…