Accumulated Return

Hi,
The following measure would work

Cumulative Return = 
VAR __AvailableTransactionDates = VALUES('Transactions'[Date])
VAR __FirstAvailableTransactionDate =
MINX(__AvailableTransactionDates, 'Transactions'[Date])
VAR __LastAvailableTransactionDate =
MAXX(__AvailableTransactionDates, 'Transactions'[Date])
VAR __IsSingleDateFiltered = HASONEVALUE('Date'[Date])
VAR __SelectedDates = ALLSELECTED('Date'[Date])
VAR __MinSelectedDate = MINX(__SelectedDates, 'Date'[Date])
VAR __CurrentDate = MAX('Date'[Date])
VAR __IsMaxDateInTranRange =
__CurrentDate <= __LastAvailableTransactionDate
VAR __IsMinDateInTranRange =
__MinSelectedDate >= __FirstAvailableTransactionDate
VAR __IsSingleAssetSelected = HASONEVALUE(Asset[AssetName])
VAR __CumReturnPeriod = 
FILTER(
    __SelectedDates,
    'Date'[Date] >= __MinSelectedDate
    && 'Date'[Date] <= __CurrentDate
)
VAR __DailyReturnsUptoCurrentPeriod = 
CALCULATETABLE(
    SUMMARIZE(
        Transactions,
        Transactions[Date],
        Transactions[Return]
    ),
    REMOVEFILTERS('Date'),
    __CumReturnPeriod
)
VAR __CumulativeReturn = 
IF(
    (
        __IsSingleAssetSelected
        && __IsSingleDateFiltered
        && __IsMaxDateInTranRange
    )
    ||
    (
        __IsSingleAssetSelected
        && NOT(__IsSingleDateFiltered)
        && __IsMaxDateInTranRange
        && __IsMinDateInTranRange
    ),  
    PRODUCTX(
        __DailyReturnsUptoCurrentPeriod,
        'Transactions'[Return]
    ) - 1
)
RETURN
__CumulativeReturn

I've also uploaded the file here.

If this answers your query, please mark it as the solution and a thumbs up would be great.