underwrite on an agency basis造句

During the period for securities underwritten on an agency basis or on a sole agency basis , securities firms shall ensure that such securities are first sold to subscribers . securities firms may not reserve , in advance , for themselves securities which they underwrite as agents , or purchase , in advance , and retain securities which they underwrite as the sole agents
证券公司在代销包销期内，对所代销包销的证券应当保证先行出售给认购人，证券公司不得为本公司事先预留所代销的证券和预先购入并留存所包销的证券。
It's difficult to find underwrite on an agency basis in a sentence. 用underwrite on an agency basis造句挺难的