Neither side of the market (debt/bonds or stocks/equity) feels like it has enough information to move out of recent holding patterns.  These sideways trends emerged last week after a an apparent "New Year Bounce" toward higher stock prices and bond yields had proven itself to be a false start.

2019-1-15 open

Perhaps 2019's early trend could have remained intact were it not for several key sources of uncertainty.  There is an important brexit-related vote in UK parliament tonight, but it will only be important for US bond markets if the vote offers a surprising result.  Right now, the expectation seems to be that the Prime Minister's brexit plan will be overwhelmingly rejected.  But if it's a reasonably close call, that would leave hope alive for brexit to happen on schedule. 

There are two ways to think about the implications of the brexit vote.  On the one hand, if brexit happens on schedule, it will confirm and solidify something that had been good for bond markets in the past because it creates uncertainty as to the future of the European economy. 

On the other hand, if the vote suggests no easy brexit, that could create even more uncertainty.  Will the UK get an extension from the EU?  Will the country go back to elections?  Will they conduct another brexit referendum?  It's tough to say which uncertainty would be more beneficial for bonds in the US.

In terms of clearing up uncertainty and waiting for info, the government shutdown is a much bigger deal.  With this being the longest-running shutdown, there's been more and more uncertainty about its impacts.  Bonds have benefited from that uncertainty, and perhaps it is also behind the stalled stock rally.  

Even if we can't go so far as to say that markets are trading the simple presence or absence of a shutdown, we can certainly say the bond market is missing economic data right at a time where economic data is critical to guiding the Fed's policy evolution.  Granted, we do get data from several government agencies that do have funding (as well as all non-government reports), but bond traders need the bigger picture in order to commit.