diff --git a/include/dxfeed_graal_cpp_api/event/option/Series.hpp b/include/dxfeed_graal_cpp_api/event/option/Series.hpp
index dd54245c..46d6e64a 100644
--- a/include/dxfeed_graal_cpp_api/event/option/Series.hpp
+++ b/include/dxfeed_graal_cpp_api/event/option/Series.hpp
@@ -83,8 +83,10 @@ class DXFCPP_EXPORT Series final : public MarketEvent, public IndexedEvent {
 
     Data data_{};
 
+    void fillData(void *graalNative) noexcept override;
+    void fillGraalData(void *graalNative) const noexcept override;
+
     static std::shared_ptr<Series> fromGraal(void *graalNative) noexcept;
-    //TODO: implement
     void* toGraal() const noexcept;
     static void freeGraal(void* graalNative) noexcept;
 
diff --git a/include/dxfeed_graal_cpp_api/event/option/TheoPrice.hpp b/include/dxfeed_graal_cpp_api/event/option/TheoPrice.hpp
index 202802ee..d686861e 100644
--- a/include/dxfeed_graal_cpp_api/event/option/TheoPrice.hpp
+++ b/include/dxfeed_graal_cpp_api/event/option/TheoPrice.hpp
@@ -82,8 +82,10 @@ class DXFCPP_EXPORT TheoPrice final : public MarketEvent, public TimeSeriesEvent
 
     Data data_{};
 
+    void fillData(void *graalNative) noexcept override;
+    void fillGraalData(void *graalNative) const noexcept override;
+
     static std::shared_ptr<TheoPrice> fromGraal(void *graalNative) noexcept;
-    //TODO: implement
     void* toGraal() const noexcept;
     static void freeGraal(void* graalNative) noexcept;
 
diff --git a/include/dxfeed_graal_cpp_api/event/option/Underlying.hpp b/include/dxfeed_graal_cpp_api/event/option/Underlying.hpp
index 2b121a8d..769b6c4d 100644
--- a/include/dxfeed_graal_cpp_api/event/option/Underlying.hpp
+++ b/include/dxfeed_graal_cpp_api/event/option/Underlying.hpp
@@ -78,8 +78,10 @@ class DXFCPP_EXPORT Underlying final : public MarketEvent, public TimeSeriesEven
 
     Data data_{};
 
+    void fillData(void *graalNative) noexcept override;
+    void fillGraalData(void *graalNative) const noexcept override;
+
     static std::shared_ptr<Underlying> fromGraal(void *graalNative) noexcept;
-    //TODO: implement
     void* toGraal() const noexcept;
     static void freeGraal(void* graalNative) noexcept;
 
diff --git a/src/event/option/Series.cpp b/src/event/option/Series.cpp
index a4af7f84..2bcc36f8 100644
--- a/src/event/option/Series.cpp
+++ b/src/event/option/Series.cpp
@@ -20,28 +20,65 @@ namespace dxfcpp {
 
 const EventTypeEnum &Series::TYPE = EventTypeEnum::SERIES;
 
+void Series::fillData(void *graalNative) noexcept {
+    if (graalNative == nullptr) {
+        return;
+    }
+
+    MarketEvent::fillData(graalNative);
+
+    auto graalSeries = static_cast<dxfg_series_t *>(graalNative);
+
+    data_ = {
+        .eventFlags = graalSeries->event_flags,
+        .index = graalSeries->index,
+        .timeSequence = graalSeries->time_sequence,
+        .expiration = graalSeries->expiration,
+        .volatility = graalSeries->volatility,
+        .callVolume = graalSeries->call_volume,
+        .putVolume = graalSeries->put_volume,
+        .putCallRatio = graalSeries->put_call_ratio,
+        .forwardPrice = graalSeries->forward_price,
+        .dividend = graalSeries->dividend,
+        .interest = graalSeries->interest,
+    };
+}
+
+void Series::fillGraalData(void *graalNative) const noexcept {
+    if (graalNative == nullptr) {
+        return;
+    }
+
+    MarketEvent::fillGraalData(graalNative);
+
+    auto graalSeries = static_cast<dxfg_series_t *>(graalNative);
+
+    graalSeries->event_flags = data_.eventFlags;
+    graalSeries->index = data_.index;
+    graalSeries->time_sequence = data_.timeSequence;
+    graalSeries->expiration = data_.expiration;
+    graalSeries->volatility = data_.volatility;
+    graalSeries->call_volume = data_.callVolume;
+    graalSeries->put_volume = data_.putVolume;
+    graalSeries->put_call_ratio = data_.putCallRatio;
+    graalSeries->forward_price = data_.forwardPrice;
+    graalSeries->dividend = data_.dividend;
+    graalSeries->interest = data_.interest;
+}
+
 std::shared_ptr<Series> Series::fromGraal(void *graalNative) noexcept {
     if (!graalNative) {
         return {};
     }
 
-    auto eventType = bit_cast<dxfg_event_type_t *>(graalNative);
-
-    if (eventType->clazz != DXFG_EVENT_SERIES) {
+    if (static_cast<dxfg_event_type_t *>(graalNative)->clazz != dxfg_event_clazz_t::DXFG_EVENT_SERIES) {
         return {};
     }
 
     try {
-        auto graalSeries = bit_cast<dxfg_series_t *>(graalNative);
-        auto series = std::make_shared<Series>(dxfcpp::toString(graalSeries->market_event.event_symbol));
+        auto series = std::make_shared<Series>();
 
-        series->setEventTime(graalSeries->market_event.event_time);
-        series->data_ = {
-            graalSeries->event_flags, graalSeries->index,          graalSeries->time_sequence,
-            graalSeries->expiration,  graalSeries->volatility,     graalSeries->call_volume,
-            graalSeries->put_volume,  graalSeries->put_call_ratio, graalSeries->forward_price,
-            graalSeries->dividend,    graalSeries->interest,
-        };
+        series->fillData(graalNative);
 
         return series;
     } catch (...) {
@@ -62,7 +99,22 @@ std::string Series::toString() const noexcept {
 }
 
 void *Series::toGraal() const noexcept {
-    return nullptr;
+    if constexpr (Debugger::isDebug) {
+        Debugger::debug(toString() + "::toGraal()");
+    }
+
+    auto *graalSeries = new (std::nothrow)
+        dxfg_series_t{.market_event = {.event_type = {.clazz = dxfg_event_clazz_t::DXFG_EVENT_SERIES}}};
+
+    if (!graalSeries) {
+        // TODO: error handling
+
+        return nullptr;
+    }
+
+    fillGraalData(static_cast<void *>(graalSeries));
+
+    return static_cast<void *>(graalSeries);
 }
 
 void Series::freeGraal(void *graalNative) noexcept {
@@ -70,15 +122,13 @@ void Series::freeGraal(void *graalNative) noexcept {
         return;
     }
 
-    auto eventType = bit_cast<dxfg_event_type_t *>(graalNative);
-
-    if (eventType->clazz != DXFG_EVENT_SERIES) {
+    if (static_cast<dxfg_event_type_t *>(graalNative)->clazz != dxfg_event_clazz_t::DXFG_EVENT_SERIES) {
         return;
     }
 
-    auto graalSeries = bit_cast<dxfg_series_t *>(graalNative);
+    auto graalSeries = static_cast<dxfg_series_t *>(graalNative);
 
-    delete[] graalSeries->market_event.event_symbol;
+    MarketEvent::freeGraalData(graalNative);
 
     delete graalSeries;
 }
diff --git a/src/event/option/TheoPrice.cpp b/src/event/option/TheoPrice.cpp
index 25aec2cd..c69ca883 100644
--- a/src/event/option/TheoPrice.cpp
+++ b/src/event/option/TheoPrice.cpp
@@ -20,27 +20,59 @@ namespace dxfcpp {
 
 const EventTypeEnum &TheoPrice::TYPE = EventTypeEnum::THEO_PRICE;
 
+void TheoPrice::fillData(void *graalNative) noexcept {
+    if (graalNative == nullptr) {
+        return;
+    }
+
+    MarketEvent::fillData(graalNative);
+
+    auto graalTheoPrice = static_cast<dxfg_theo_price_t *>(graalNative);
+
+    data_ = {
+        .eventFlags = graalTheoPrice->event_flags,
+        .index = graalTheoPrice->index,
+        .price = graalTheoPrice->price,
+        .underlyingPrice = graalTheoPrice->underlying_price,
+        .delta = graalTheoPrice->delta,
+        .gamma = graalTheoPrice->gamma,
+        .dividend = graalTheoPrice->dividend,
+        .interest = graalTheoPrice->interest,
+    };
+}
+
+void TheoPrice::fillGraalData(void *graalNative) const noexcept {
+    if (graalNative == nullptr) {
+        return;
+    }
+
+    MarketEvent::fillGraalData(graalNative);
+
+    auto graalTheoPrice = static_cast<dxfg_theo_price_t *>(graalNative);
+
+    graalTheoPrice->event_flags = data_.eventFlags;
+    graalTheoPrice->index = data_.index;
+    graalTheoPrice->price = data_.price;
+    graalTheoPrice->underlying_price = data_.underlyingPrice;
+    graalTheoPrice->delta = data_.delta;
+    graalTheoPrice->gamma = data_.gamma;
+    graalTheoPrice->dividend = data_.dividend;
+    graalTheoPrice->interest = data_.interest;
+}
+
 std::shared_ptr<TheoPrice> TheoPrice::fromGraal(void *graalNative) noexcept {
     if (!graalNative) {
         return {};
     }
 
-    auto eventType = bit_cast<dxfg_event_type_t *>(graalNative);
-
-    if (eventType->clazz != DXFG_EVENT_THEO_PRICE) {
+    if (static_cast<dxfg_event_type_t *>(graalNative)->clazz != dxfg_event_clazz_t::DXFG_EVENT_THEO_PRICE) {
         return {};
     }
 
     try {
-        auto graalTheoPrice = bit_cast<dxfg_theo_price_t *>(graalNative);
-        auto theoPrice = std::make_shared<TheoPrice>(dxfcpp::toString(graalTheoPrice->market_event.event_symbol));
+        auto theoPrice = std::make_shared<TheoPrice>();
 
-        theoPrice->setEventTime(graalTheoPrice->market_event.event_time);
-        theoPrice->data_ = {
-            graalTheoPrice->event_flags,      graalTheoPrice->index,    graalTheoPrice->price,
-            graalTheoPrice->underlying_price, graalTheoPrice->delta,    graalTheoPrice->gamma,
-            graalTheoPrice->dividend,         graalTheoPrice->interest,
-        };
+        theoPrice->fillData(graalNative);
 
         return theoPrice;
     } catch (...) {
@@ -60,7 +92,22 @@ std::string TheoPrice::toString() const noexcept {
 }
 
 void *TheoPrice::toGraal() const noexcept {
-    return nullptr;
+    if constexpr (Debugger::isDebug) {
+        Debugger::debug(toString() + "::toGraal()");
+    }
+
+    auto *graalTheoPrice = new (std::nothrow)
+        dxfg_theo_price_t{.market_event = {.event_type = {.clazz = dxfg_event_clazz_t::DXFG_EVENT_THEO_PRICE}}};
+
+    if (!graalTheoPrice) {
+        // TODO: error handling
+
+        return nullptr;
+    }
+
+    fillGraalData(static_cast<void *>(graalTheoPrice));
+
+    return static_cast<void *>(graalTheoPrice);
 }
 
 void TheoPrice::freeGraal(void *graalNative) noexcept {
@@ -68,15 +115,13 @@ void TheoPrice::freeGraal(void *graalNative) noexcept {
         return;
     }
 
-    auto eventType = bit_cast<dxfg_event_type_t *>(graalNative);
-
-    if (eventType->clazz != DXFG_EVENT_THEO_PRICE) {
+    if (static_cast<dxfg_event_type_t *>(graalNative)->clazz != dxfg_event_clazz_t::DXFG_EVENT_THEO_PRICE) {
         return;
     }
 
-    auto graalTheoPrice = bit_cast<dxfg_theo_price_t *>(graalNative);
+    auto graalTheoPrice = static_cast<dxfg_theo_price_t *>(graalNative);
 
-    delete[] graalTheoPrice->market_event.event_symbol;
+    MarketEvent::freeGraalData(graalNative);
 
     delete graalTheoPrice;
 }
diff --git a/src/event/option/Underlying.cpp b/src/event/option/Underlying.cpp
index f312a441..ded9ae46 100644
--- a/src/event/option/Underlying.cpp
+++ b/src/event/option/Underlying.cpp
@@ -20,27 +20,59 @@ namespace dxfcpp {
 
 const EventTypeEnum &Underlying::TYPE = EventTypeEnum::UNDERLYING;
 
+void Underlying::fillData(void *graalNative) noexcept {
+    if (graalNative == nullptr) {
+        return;
+    }
+
+    MarketEvent::fillData(graalNative);
+
+    auto graalUnderlying = static_cast<dxfg_underlying_t *>(graalNative);
+
+    data_ = {
+        .eventFlags = graalUnderlying->event_flags,
+        .index = graalUnderlying->index,
+        .volatility = graalUnderlying->volatility,
+        .frontVolatility = graalUnderlying->front_volatility,
+        .backVolatility = graalUnderlying->back_volatility,
+        .callVolume = graalUnderlying->call_volume,
+        .putVolume = graalUnderlying->put_volume,
+        .putCallRatio = graalUnderlying->put_call_ratio,
+    };
+}
+
+void Underlying::fillGraalData(void *graalNative) const noexcept {
+    if (graalNative == nullptr) {
+        return;
+    }
+
+    MarketEvent::fillGraalData(graalNative);
+
+    auto graalUnderlying = static_cast<dxfg_underlying_t *>(graalNative);
+
+    graalUnderlying->event_flags = data_.eventFlags;
+    graalUnderlying->index = data_.index;
+    graalUnderlying->volatility = data_.volatility;
+    graalUnderlying->front_volatility = data_.frontVolatility;
+    graalUnderlying->back_volatility = data_.backVolatility;
+    graalUnderlying->call_volume = data_.callVolume;
+    graalUnderlying->put_volume = data_.putVolume;
+    graalUnderlying->put_call_ratio = data_.putCallRatio;
+}
+
 std::shared_ptr<Underlying> Underlying::fromGraal(void *graalNative) noexcept {
     if (!graalNative) {
         return {};
     }
 
-    auto eventType = bit_cast<dxfg_event_type_t *>(graalNative);
-
-    if (eventType->clazz != DXFG_EVENT_UNDERLYING) {
+    if (static_cast<dxfg_event_type_t *>(graalNative)->clazz != dxfg_event_clazz_t::DXFG_EVENT_UNDERLYING) {
         return {};
     }
 
     try {
-        auto graalUnderlying = bit_cast<dxfg_underlying_t *>(graalNative);
-        auto underlying = std::make_shared<Underlying>(dxfcpp::toString(graalUnderlying->market_event.event_symbol));
+        auto underlying = std::make_shared<Underlying>();
 
-        underlying->setEventTime(graalUnderlying->market_event.event_time);
-        underlying->data_ = {
-            graalUnderlying->event_flags,      graalUnderlying->index,           graalUnderlying->volatility,
-            graalUnderlying->front_volatility, graalUnderlying->back_volatility, graalUnderlying->call_volume,
-            graalUnderlying->put_volume,       graalUnderlying->put_call_ratio,
-        };
+        underlying->fillData(graalNative);
 
         return underlying;
     } catch (...) {
@@ -61,7 +93,22 @@ std::string Underlying::toString() const noexcept {
 }
 
 void *Underlying::toGraal() const noexcept {
-    return nullptr;
+    if constexpr (Debugger::isDebug) {
+        Debugger::debug(toString() + "::toGraal()");
+    }
+
+    auto *graalUnderlying = new (std::nothrow)
+        dxfg_underlying_t{.market_event = {.event_type = {.clazz = dxfg_event_clazz_t::DXFG_EVENT_UNDERLYING}}};
+
+    if (!graalUnderlying) {
+        // TODO: error handling
+
+        return nullptr;
+    }
+
+    fillGraalData(static_cast<void *>(graalUnderlying));
+
+    return static_cast<void *>(graalUnderlying);
 }
 
 void Underlying::freeGraal(void *graalNative) noexcept {
@@ -69,15 +116,13 @@ void Underlying::freeGraal(void *graalNative) noexcept {
         return;
     }
 
-    auto eventType = bit_cast<dxfg_event_type_t *>(graalNative);
-
-    if (eventType->clazz != DXFG_EVENT_UNDERLYING) {
+    if (static_cast<dxfg_event_type_t *>(graalNative)->clazz != dxfg_event_clazz_t::DXFG_EVENT_UNDERLYING) {
         return;
     }
 
-    auto graalUnderlying = bit_cast<dxfg_underlying_t *>(graalNative);
+    auto graalUnderlying = static_cast<dxfg_underlying_t *>(graalNative);
 
-    delete[] graalUnderlying->market_event.event_symbol;
+    MarketEvent::freeGraalData(graalNative);
 
     delete graalUnderlying;
 }