JNSTX is a mutual fund that focuses on short-term, flexible bond investments. It is managed by Janus Henderson, a global investment management firm. This fund aims to provide investors with a balance of income and capital preservation by investing in a variety of fixed income securities with varying maturities. The "D Shares" designation indicates that this fund has a sales charge, which may be waived for certain investors. Overall, JNSTX offers a conservative option for investors looking for short-term bond exposure with the potential for some flexibility in the portfolio.