diff --git a/src/alpaca/actions.ts b/src/alpaca/actions.ts
index 1be98b9..d71cdb1 100644
--- a/src/alpaca/actions.ts
+++ b/src/alpaca/actions.ts
@@ -1,6 +1,10 @@
 import Alpaca from '@alpacahq/alpaca-trade-api';
 import { ActionSide, ActionFetchOptions, ActionFetchResponse, ActionDateType } from '../interface/actions';
 
+/**
+ * The activity object returned by Alpaca.
+ * @see https://docs.alpaca.markets/reference/getaccountactivitiesbyactivitytype
+ */
 interface AlpacaActivity {
     id: string;
     activity_type: string;
diff --git a/src/alpaca/portfolio.ts b/src/alpaca/portfolio.ts
index 105d68a..03cf3fc 100644
--- a/src/alpaca/portfolio.ts
+++ b/src/alpaca/portfolio.ts
@@ -1,5 +1,5 @@
 import Alpaca from '@alpacahq/alpaca-trade-api';
-import { PortfolioProvider, Portfolio, Position } from '../interface/portfolio';
+import { PortfolioProvider, Portfolio } from '../interface/portfolio';
 
 /**
  * The position object returned by Alpaca.
@@ -48,7 +48,7 @@ export class AlpacaPortfolioProvider implements PortfolioProvider {
                         marketValue: parseFloat(position.market_value),
                         costBasis: parseFloat(position.cost_basis),
                         pricePerShare: parseFloat(position.avg_entry_price)
-                    }
+                    };
                 })
             };
         });
diff --git a/src/alpaca/quote.ts b/src/alpaca/quote.ts
index 574a106..7b0e6bd 100644
--- a/src/alpaca/quote.ts
+++ b/src/alpaca/quote.ts
@@ -17,14 +17,14 @@ export class AlpacaQuoteProvider implements QuoteProvider {
      */
     readonly fetchQuote = (symbol: string): Promise<Quote> => {
         return this.alpaca.getLatestQuote(symbol).then((quote) => {
-            return new Quote(
-                quote.Symbol,
-                quote.AskPrice,
-                quote.AskSize,
-                quote.BidPrice,
-                quote.BidSize,
-                new Date(Date.parse(quote.Timestamp))
-            );
+            return {
+                symbol: quote.Symbol,
+                askPrice: quote.AskPrice,
+                askSize: quote.AskSize,
+                bidPrice: quote.BidPrice,
+                bidSize: quote.BidSize,
+                timestamp: new Date(Date.parse(quote.Timestamp))
+            };
         }).catch((err) => {
             return err;
         });
diff --git a/src/interface/portfolio.ts b/src/interface/portfolio.ts
index 0d26058..e20e152 100644
--- a/src/interface/portfolio.ts
+++ b/src/interface/portfolio.ts
@@ -2,6 +2,7 @@
  * Represents a financial position in a portfolio.
  */
 export interface Position {
+
     /**
      * The symbol name of the asset
      */
@@ -32,6 +33,7 @@ export interface Position {
  * Represents a portfolio of financial positions.
  */
 export interface Portfolio {
+
     /**
      * An array of positions held in the portfolio.
      */
diff --git a/src/interface/quote.ts b/src/interface/quote.ts
index 4449bb8..2856632 100644
--- a/src/interface/quote.ts
+++ b/src/interface/quote.ts
@@ -1,22 +1,37 @@
 /**
  * Represents a stock quote.
  */
-export class Quote {
-    readonly symbol: string;
-    readonly askPrice: number;
-    readonly askSize: number;
-    readonly bidPrice: number;
-    readonly bidSize: number;
-    readonly timeStamp: Date;
+export interface Quote {
 
-    constructor(symbol: string, askPrice: number, askSize: number, bidPrice: number, bidSize: number, timeStamp: Date) {
-        this.symbol = symbol;
-        this.askPrice = askPrice;
-        this.askSize = askSize;
-        this.bidPrice = bidPrice;
-        this.bidSize = bidSize;
-        this.timeStamp = timeStamp;
-    }
+    /**
+     * The symbol of the asset
+     */
+    readonly symbol: string;
+
+    /**
+     * The ask price of the asset
+     */
+    readonly askPrice: number;
+
+    /**
+     * The ask size of the asset
+     */
+    readonly askSize: number;
+
+    /**
+     * The bid price of the asset
+     */
+    readonly bidPrice: number;
+
+    /**
+     * The bid size of the asset
+     */
+    readonly bidSize: number;
+
+    /**
+     * The timestamp of the quote
+     */
+    readonly timeStamp: Date;
 }
 
 /**