** As Q1 draws to a close, energy .SPNY looked set to come out the top performer among the S&P 500's .SPX major industry sectors for the quarter, with a ~9% gain for the period

** Energy, up 0.7% on Mon, is also among the best-performing sectors of the day, outperforming the broader market, with the S&P 500 last down 0.4% on the day and on track for a more than 5.5% loss for the quarter

** Oil majors Exxon Mobil XOM.N, ConocoPhillips COP.N and Chevron CVX.N were giving energy its biggest boost on Mon, with oil prices hitting five-week highs on Russia and Iran supply concerns

** Oil investors are worried supplies could fall if U.S. President Donald Trump follows through on threats to impose more tariffs on Russia and to possibly attack Iran

** Consumer discretionary .SPLRCD looked to be S&P 500's worst-performing sector for the quarter, set for a decline of ~14.8%

(Reporting by Caroline Valetkevitch)

((caroline.valetkevitch@thomsonreuters.com))