diff --git a/include/mqt-core/dd/statistics/MemoryManagerStatistics.hpp b/include/mqt-core/dd/statistics/MemoryManagerStatistics.hpp
index 6222f81a0..e95de140b 100644
--- a/include/mqt-core/dd/statistics/MemoryManagerStatistics.hpp
+++ b/include/mqt-core/dd/statistics/MemoryManagerStatistics.hpp
@@ -12,7 +12,9 @@
 #include "dd/statistics/Statistics.hpp"
 #include "nlohmann/json_fwd.hpp"
 
+#include <algorithm>
 #include <cstddef>
+#include <nlohmann/json.hpp>
 
 namespace dd {
 
@@ -73,4 +75,91 @@ template <typename T> struct MemoryManagerStatistics : public Statistics {
   [[nodiscard]] nlohmann::json json() const override;
 };
 
+///-----------------------------------------------------------------------------
+///                      \n Method Definitions \n
+///-----------------------------------------------------------------------------
+
+template <typename T>
+std::size_t
+MemoryManagerStatistics<T>::getNumAvailableFromChunks() const noexcept {
+  return getTotalNumAvailable() - numAvailableForReuse;
+}
+
+template <typename T>
+std::size_t MemoryManagerStatistics<T>::getTotalNumAvailable() const noexcept {
+  return numAllocated - numUsed;
+}
+
+template <typename T>
+double MemoryManagerStatistics<T>::getUsageRatio() const noexcept {
+  return static_cast<double>(numUsed) / static_cast<double>(numAllocated);
+}
+
+template <typename T>
+double MemoryManagerStatistics<T>::getAllocatedMemoryMiB() const noexcept {
+  return static_cast<double>(numAllocated) * ENTRY_MEMORY_MIB;
+}
+
+template <typename T>
+double MemoryManagerStatistics<T>::getUsedMemoryMiB() const noexcept {
+  return static_cast<double>(numUsed) * ENTRY_MEMORY_MIB;
+}
+
+template <typename T>
+double MemoryManagerStatistics<T>::getPeakUsedMemoryMiB() const noexcept {
+  return static_cast<double>(peakNumUsed) * ENTRY_MEMORY_MIB;
+}
+
+template <typename T>
+void MemoryManagerStatistics<T>::trackUsedEntries(
+    const std::size_t numEntries) noexcept {
+  numUsed += numEntries;
+  peakNumUsed = std::max(peakNumUsed, numUsed);
+}
+
+template <typename T>
+void MemoryManagerStatistics<T>::trackReusedEntries(
+    const std::size_t numEntries) noexcept {
+  numUsed += numEntries;
+  peakNumUsed = std::max(peakNumUsed, numUsed);
+  numAvailableForReuse -= numEntries;
+}
+
+template <typename T>
+void MemoryManagerStatistics<T>::trackReturnedEntry() noexcept {
+  ++numAvailableForReuse;
+  peakNumAvailableForReuse =
+      std::max(peakNumAvailableForReuse, numAvailableForReuse);
+  --numUsed;
+}
+
+template <typename T> void MemoryManagerStatistics<T>::reset() noexcept {
+  numAllocations = 0U;
+  numAllocated = 0U;
+  numUsed = 0U;
+  numAvailableForReuse = 0U;
+}
+
+template <typename T>
+nlohmann::basic_json<> MemoryManagerStatistics<T>::json() const {
+  if (peakNumUsed == 0) {
+    return "unused";
+  }
+
+  auto j = Statistics::json();
+  j["memory_allocated_MiB"] = getAllocatedMemoryMiB();
+  j["memory_used_MiB"] = getUsedMemoryMiB();
+  j["memory_used_MiB_peak"] = getPeakUsedMemoryMiB();
+  j["num_allocated"] = numAllocated;
+  j["num_allocations"] = numAllocations;
+  j["num_available_for_reuse"] = numAvailableForReuse;
+  j["num_available_for_reuse_peak"] = peakNumAvailableForReuse;
+  j["num_available_from_chunks"] = getNumAvailableFromChunks();
+  j["num_available_total"] = getTotalNumAvailable();
+  j["num_used"] = numUsed;
+  j["num_used_peak"] = peakNumUsed;
+  j["usage_ratio"] = getUsageRatio();
+  return j;
+}
+
 } // namespace dd
diff --git a/src/dd/statistics/MemoryManagerStatistics.cpp b/src/dd/statistics/MemoryManagerStatistics.cpp
deleted file mode 100644
index 2e1446688..000000000
--- a/src/dd/statistics/MemoryManagerStatistics.cpp
+++ /dev/null
@@ -1,109 +0,0 @@
-/*
- * Copyright (c) 2025 Chair for Design Automation, TUM
- * All rights reserved.
- *
- * SPDX-License-Identifier: MIT
- *
- * Licensed under the MIT License
- */
-
-#include "dd/statistics/MemoryManagerStatistics.hpp"
-
-#include "dd/Node.hpp"
-#include "dd/RealNumber.hpp"
-#include "dd/statistics/Statistics.hpp"
-
-#include <algorithm>
-#include <cstddef>
-#include <nlohmann/json.hpp>
-
-namespace dd {
-
-template <typename T>
-std::size_t
-MemoryManagerStatistics<T>::getNumAvailableFromChunks() const noexcept {
-  return getTotalNumAvailable() - numAvailableForReuse;
-}
-
-template <typename T>
-std::size_t MemoryManagerStatistics<T>::getTotalNumAvailable() const noexcept {
-  return numAllocated - numUsed;
-}
-
-template <typename T>
-double MemoryManagerStatistics<T>::getUsageRatio() const noexcept {
-  return static_cast<double>(numUsed) / static_cast<double>(numAllocated);
-}
-
-template <typename T>
-double MemoryManagerStatistics<T>::getAllocatedMemoryMiB() const noexcept {
-  return static_cast<double>(numAllocated) * ENTRY_MEMORY_MIB;
-}
-
-template <typename T>
-double MemoryManagerStatistics<T>::getUsedMemoryMiB() const noexcept {
-  return static_cast<double>(numUsed) * ENTRY_MEMORY_MIB;
-}
-
-template <typename T>
-double MemoryManagerStatistics<T>::getPeakUsedMemoryMiB() const noexcept {
-  return static_cast<double>(peakNumUsed) * ENTRY_MEMORY_MIB;
-}
-
-template <typename T>
-void MemoryManagerStatistics<T>::trackUsedEntries(
-    const std::size_t numEntries) noexcept {
-  numUsed += numEntries;
-  peakNumUsed = std::max(peakNumUsed, numUsed);
-}
-
-template <typename T>
-void MemoryManagerStatistics<T>::trackReusedEntries(
-    const std::size_t numEntries) noexcept {
-  numUsed += numEntries;
-  peakNumUsed = std::max(peakNumUsed, numUsed);
-  numAvailableForReuse -= numEntries;
-}
-
-template <typename T>
-void MemoryManagerStatistics<T>::trackReturnedEntry() noexcept {
-  ++numAvailableForReuse;
-  peakNumAvailableForReuse =
-      std::max(peakNumAvailableForReuse, numAvailableForReuse);
-  --numUsed;
-}
-
-template <typename T> void MemoryManagerStatistics<T>::reset() noexcept {
-  numAllocations = 0U;
-  numAllocated = 0U;
-  numUsed = 0U;
-  numAvailableForReuse = 0U;
-}
-
-template <typename T>
-nlohmann::basic_json<> MemoryManagerStatistics<T>::json() const {
-  if (peakNumUsed == 0) {
-    return "unused";
-  }
-
-  auto j = Statistics::json();
-  j["memory_allocated_MiB"] = getAllocatedMemoryMiB();
-  j["memory_used_MiB"] = getUsedMemoryMiB();
-  j["memory_used_MiB_peak"] = getPeakUsedMemoryMiB();
-  j["num_allocated"] = numAllocated;
-  j["num_allocations"] = numAllocations;
-  j["num_available_for_reuse"] = numAvailableForReuse;
-  j["num_available_for_reuse_peak"] = peakNumAvailableForReuse;
-  j["num_available_from_chunks"] = getNumAvailableFromChunks();
-  j["num_available_total"] = getTotalNumAvailable();
-  j["num_used"] = numUsed;
-  j["num_used_peak"] = peakNumUsed;
-  j["usage_ratio"] = getUsageRatio();
-  return j;
-}
-
-template struct MemoryManagerStatistics<RealNumber>;
-template struct MemoryManagerStatistics<vNode>;
-template struct MemoryManagerStatistics<mNode>;
-template struct MemoryManagerStatistics<dNode>;
-} // namespace dd