diff --git a/src/main/java/millions/controller/CSVStockFileWriter.java b/src/main/java/millions/controller/CSVStockFileWriter.java
new file mode 100644
index 0000000..ceb4677
--- /dev/null
+++ b/src/main/java/millions/controller/CSVStockFileWriter.java
@@ -0,0 +1,35 @@
+package millions.controller;
+
+import millions.model.Stock;
+
+import java.io.FileWriter;
+import java.util.ArrayList;
+import java.util.List;
+
+public class CSVStockFileWriter implements StockFileWriter {
+  List<Stock> stocks;
+  String finalString;
+
+  public CSVStockFileWriter(List<Stock> stocks) {
+    this.stocks = stocks;
+  }
+
+  @Override
+  public void formatString() {
+    StringBuilder builder = new StringBuilder();
+    stocks.forEach(stock -> {
+      builder.append(stock.getSymbol());
+      builder.append(",");
+      builder.append(stock.getCompany());
+      builder.append(",");
+      builder.append(stock.getLatestPriceChange().toString());
+    });
+    this.finalString = builder.toString();
+  }
+
+  @Override
+  public boolean write(){
+    // TODO: handle file creation/file selection when writing to file
+    return false;
+  }
+}
diff --git a/src/main/java/millions/controller/StockFileWriter.java b/src/main/java/millions/controller/StockFileWriter.java
new file mode 100644
index 0000000..2e2046d
--- /dev/null
+++ b/src/main/java/millions/controller/StockFileWriter.java
@@ -0,0 +1,8 @@
+package millions.controller;
+
+import java.util.List;
+
+public interface StockFileWriter {
+  public void formatString();
+  public boolean write();
+}
diff --git a/src/main/java/millions/controller/StockInformationWriter.java b/src/main/java/millions/controller/StockInformationWriter.java
deleted file mode 100644
index 692bc75..0000000
--- a/src/main/java/millions/controller/StockInformationWriter.java
+++ /dev/null
@@ -1,34 +0,0 @@
-package millions.controller;
-
-import millions.model.Stock;
-
-import java.io.*;
-import java.util.List;
-
-public class StockInformationWriter {
-  private final List<Stock> stocks;
-  private final File destinationFile;
-
-  public StockInformationWriter(List<Stock> stocks, File destinationFile) {
-    this.stocks = stocks;
-    this.destinationFile = destinationFile;
-  }
-
-  public void write() {
-    StringBuilder builder = new StringBuilder();
-    for (Stock stock : stocks) {
-      builder.append(stock.getSymbol());
-      builder.append(",");
-      builder.append(stock.getCompany());
-      builder.append(",");
-      // Unsure if price history or just latest price should be saved
-      builder.append(stock.getSalesPrice().toPlainString());
-      builder.append("\n");
-    }
-    try (FileWriter writer = new FileWriter(destinationFile); BufferedWriter bufferedWriter = new BufferedWriter(writer)) {
-      bufferedWriter.write(builder.toString());
-    } catch (IOException e) {
-      e.printStackTrace();
-    }
-  }
-}