diff --git a/alpaca/entities.go b/alpaca/entities.go
index 0577390..cd1d8f5 100644
--- a/alpaca/entities.go
+++ b/alpaca/entities.go
@@ -181,6 +181,13 @@ type AccountActvity struct {
 	PerShareAmount  decimal.Decimal `json:"per_share_amount"`
 }
 
+type PortfolioHistory struct {
+	Arrays     []interface{}       `json:"arrays"`
+	Attributes []map[string]string `json:"attributes"`
+	Timeframe  RangeFreq           `json:"timeframe"`
+	BaseValue  float64             `json:"base_value"`
+}
+
 type PlaceOrderRequest struct {
 	AccountID     string           `json:"-"`
 	AssetKey      *string          `json:"symbol"`
@@ -288,6 +295,27 @@ const (
 	All  TradeConfirmEmail = "all"
 )
 
+type HistoryPeriod string
+
+const (
+	Month1     HistoryPeriod = "1M"
+	Month3     HistoryPeriod = "3M"
+	Month6     HistoryPeriod = "6M"
+	Year       HistoryPeriod = "1A"
+	AllHistory HistoryPeriod = "all"
+	Intraday   HistoryPeriod = "intraday"
+)
+
+type RangeFreq string
+
+const (
+	Min1  RangeFreq = "1Min"
+	Min5  RangeFreq = "5Min"
+	Min15 RangeFreq = "15Min"
+	Hour1 RangeFreq = "1H"
+	Day1  RangeFreq = "1D"
+)
+
 // stream
 
 // ClientMsg is the standard message sent by clients of the stream interface
diff --git a/alpaca/rest.go b/alpaca/rest.go
index f428ce4..38bbf53 100644
--- a/alpaca/rest.go
+++ b/alpaca/rest.go
@@ -193,6 +193,32 @@ func (c *Client) GetAccountActivities(activityType *string, opts *AccountActivit
 	return activities, nil
 }
 
+func (c *Client) GetPortfolioHistory(startDate, endDate *time.Time, period *HistoryPeriod, timeframe *RangeFreq, extended bool) (*PortfolioHistory, error) {
+	var u *url.URL
+	var err error
+	u, err = url.Parse(fmt.Sprintf("%s/%s/account/portfolio/history", base, apiVersion))
+	if err != nil {
+		return nil, err
+	}
+
+	q := u.Query()
+	if startDate != nil {
+		q.Set("start_date", startDate.Format(time.RFC3339))
+	}
+	if endDate != nil {
+		q.Set("end_date", endDate.Format(time.RFC3339))
+	}
+	if period != nil {
+		q.Set("period", string(*period))
+	}
+	if timeframe != nil {
+		q.Set("period", string(*timeframe))
+	}
+	q.Set("extended", strconv.FormatBool(extended))
+
+	return &PortfolioHistory{}, nil
+}
+
 // ListPositions lists the account's open positions.
 func (c *Client) ListPositions() ([]Position, error) {
 	u, err := url.Parse(fmt.Sprintf("%s/%s/positions", base, apiVersion))
@@ -588,6 +614,10 @@ func GetAccountActivities(activityType *string, opts *AccountActivitiesRequest)
 	return DefaultClient.GetAccountActivities(activityType, opts)
 }
 
+func GetPortfolioHistory(startDate, endDate *time.Time, period *HistoryPeriod, timeframe *RangeFreq, extended bool) (*PortfolioHistory, error) {
+	return DefaultClient.GetPortfolioHistory(startDate, endDate, period, timeframe, extended)
+}
+
 // ListPositions lists the account's open positions
 // using the default Alpaca client.
 func ListPositions() ([]Position, error) {