diff --git a/components/core/src/clp_s/JsonFileIterator.cpp b/components/core/src/clp_s/JsonFileIterator.cpp
index 5fffcc8f9..ad6d16cd0 100644
--- a/components/core/src/clp_s/JsonFileIterator.cpp
+++ b/components/core/src/clp_s/JsonFileIterator.cpp
@@ -156,4 +156,14 @@ bool JsonFileIterator::get_json(simdjson::ondemand::document_stream::iterator& i
     } while (read_new_json());
     return false;
 }
+
+size_t JsonFileIterator::get_num_bytes_consumed() {
+    // If there are more documents left in the current buffer account for how much of the
+    // buffer has been consumed, otherwise report the total number of bytes read so that we
+    // capture trailing whitespace.
+    if (m_doc_it != m_stream.end()) {
+        return m_bytes_read - (m_buf_occupied - m_next_document_position);
+    }
+    return m_bytes_read;
+}
 }  // namespace clp_s
diff --git a/components/core/src/clp_s/JsonFileIterator.hpp b/components/core/src/clp_s/JsonFileIterator.hpp
index 51422963a..b8db3f4f2 100644
--- a/components/core/src/clp_s/JsonFileIterator.hpp
+++ b/components/core/src/clp_s/JsonFileIterator.hpp
@@ -51,6 +51,14 @@ class JsonFileIterator {
      */
     [[nodiscard]] size_t get_num_bytes_read() const { return m_bytes_read; }
 
+    /**
+     * Note: this method can not be const because checking if a simdjson iterator is at the end
+     * of a document stream is non-const.
+     *
+     * @return total number of bytes consumed from the file via get_json
+     */
+    [[nodiscard]] size_t get_num_bytes_consumed();
+
     /**
      * @return the last error code encountered when iterating over the json file
      */
diff --git a/components/core/src/clp_s/JsonParser.cpp b/components/core/src/clp_s/JsonParser.cpp
index d73643a64..26ec3d7b4 100644
--- a/components/core/src/clp_s/JsonParser.cpp
+++ b/components/core/src/clp_s/JsonParser.cpp
@@ -439,7 +439,7 @@ bool JsonParser::parse() {
         simdjson::ondemand::document_stream::iterator json_it;
 
         m_num_messages = 0;
-        size_t last_num_bytes_read = 0;
+        size_t last_num_bytes_consumed = 0;
         while (json_file_iterator.get_json(json_it)) {
             m_current_schema.clear();
 
@@ -463,9 +463,11 @@ bool JsonParser::parse() {
                     ->append_message(current_schema_id, m_current_schema, m_current_parsed_message);
 
             if (m_archive_writer->get_data_size() >= m_target_encoded_size) {
-                size_t num_bytes_read = json_file_iterator.get_num_bytes_read();
-                m_archive_writer->increment_uncompressed_size(num_bytes_read - last_num_bytes_read);
-                last_num_bytes_read = num_bytes_read;
+                size_t num_bytes_read = json_file_iterator.get_num_bytes_consumed();
+                m_archive_writer->increment_uncompressed_size(
+                        num_bytes_read - last_num_bytes_consumed
+                );
+                last_num_bytes_consumed = num_bytes_read;
                 split_archive();
             }
 
@@ -473,7 +475,7 @@ bool JsonParser::parse() {
         }
 
         m_archive_writer->increment_uncompressed_size(
-                json_file_iterator.get_num_bytes_read() - last_num_bytes_read
+                json_file_iterator.get_num_bytes_read() - last_num_bytes_consumed
         );
 
         if (simdjson::error_code::SUCCESS != json_file_iterator.get_error()) {