someone suggested this
SELECT tblDividend.CompanyKey, Sum(tblDividend.DPS) AS SumOfDPS,
Max(tblDividend.PeriodEndDate) AS MaxOfPeriodEndDate,
Max(tblDividend.ExDividendDate) AS MaxOfExDivDate
FROM tblDividend
WHERE CompanyKey =1582
GROUP BY tblDividend.CompanyKey, Year([PeriodEndDate])...