Sell in May and come back later.

The epic comeback since Feb 11 had given us a impulsive structure that could lead to a longer term rally. The Feb 11 low is also a good candidate of a long term 4th wave pivot.
Near term the rally has stalled and so much uncertainty like brext vote could trigger a broad range risk off sentiment.
S&P is likely trading higher from here but a much sharper decline is ahead of us. Sell in May.
But remember to check back as there is going to be a good opportunity thereafter if you are the buy only investor.
S&P 500 (SPX500)

Disclaimer