diff --git a/CHANGELOG.md b/CHANGELOG.md
index 97914c913b..a09b5c8449 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -19,6 +19,7 @@
 - Extract thread ID and name in spans. ([#3771](https://github.com/getsentry/relay/pull/3771))
 - Compute metrics summary on the extracted custom metrics. ([#3769](https://github.com/getsentry/relay/pull/3769))
 - Add support for `all` and `any` `RuleCondition`(s). ([#3791](https://github.com/getsentry/relay/pull/3791))
+- Copy root span data from `contexts.trace.data` when converting transaction events into raw spans. ([#3790](https://github.com/getsentry/relay/pull/3790))
 
 ## 24.6.0
 
diff --git a/relay-event-schema/src/protocol/span.rs b/relay-event-schema/src/protocol/span.rs
index 3207babd69..8664f93dae 100644
--- a/relay-event-schema/src/protocol/span.rs
+++ b/relay-event-schema/src/protocol/span.rs
@@ -6,8 +6,8 @@ use relay_protocol::{Annotated, Empty, FromValue, Getter, IntoValue, Object, Val
 
 use crate::processor::ProcessValue;
 use crate::protocol::{
-    EventId, JsonLenientString, LenientString, Measurements, MetricsSummary, OperationType,
-    OriginType, SpanId, SpanStatus, ThreadId, Timestamp, TraceId,
+    Data as TraceData, EventId, JsonLenientString, LenientString, Measurements, MetricsSummary,
+    OperationType, OriginType, SpanId, SpanStatus, ThreadId, Timestamp, TraceId,
 };
 
 #[derive(Clone, Debug, Default, PartialEq, Empty, FromValue, IntoValue, ProcessValue)]
@@ -454,6 +454,22 @@ impl Getter for SpanData {
     }
 }
 
+impl From<TraceData> for SpanData {
+    fn from(trace_data: TraceData) -> Self {
+        FromValue::from_value(Annotated::new(trace_data.into_value()))
+            .into_value()
+            .unwrap_or_default()
+    }
+}
+
+impl From<SpanData> for TraceData {
+    fn from(span_data: SpanData) -> Self {
+        FromValue::from_value(Annotated::new(span_data.into_value()))
+            .into_value()
+            .unwrap_or_default()
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use crate::protocol::Measurement;
diff --git a/relay-event-schema/src/protocol/span/convert.rs b/relay-event-schema/src/protocol/span/convert.rs
index 7907a0a5ba..7963472992 100644
--- a/relay-event-schema/src/protocol/span/convert.rs
+++ b/relay-event-schema/src/protocol/span/convert.rs
@@ -154,6 +154,8 @@ macro_rules! map_fields {
 // This macro call implements a bidirectional mapping between transaction event and segment spans,
 // allowing users to call both `Event::from(&span)` and `Span::from(&event)`.
 map_fields!(
+    // Data must go first to ensure it doesn't overwrite more specific fields
+    span.data <=> event.contexts.trace.data,
     span._metrics_summary <=> event._metrics_summary,
     span.description <=> event.transaction,
     span.data.segment_name <=> event.transaction,
@@ -188,6 +190,7 @@ map_fields!(
 #[cfg(test)]
 mod tests {
     use relay_protocol::Annotated;
+    use similar_asserts::assert_eq;
 
     use crate::protocol::{SpanData, SpanId};
 
@@ -214,7 +217,10 @@ mod tests {
                         "op": "myop",
                         "status": "ok",
                         "exclusive_time": 123.4,
-                        "parent_span_id": "FA90FDEAD5F74051"
+                        "parent_span_id": "FA90FDEAD5F74051",
+                        "data": {
+                            "custom_attribute": 42
+                        }
                     }
                 },
                 "_metrics_summary": {
@@ -320,7 +326,13 @@ mod tests {
                 user_agent_original: ~,
                 url_full: ~,
                 client_address: ~,
-                other: {},
+                other: {
+                    "custom_attribute": I64(
+                        42,
+                    ),
+                    "previousRoute": ~,
+                    "route": ~,
+                },
             },
             sentry_tags: ~,
             received: ~,
@@ -360,6 +372,21 @@ mod tests {
         let event_id = event_from_span.id.value_mut().take().unwrap();
         assert_eq!(&event_id.to_string(), "0000000000000000fa90fdead5f74052");
 
+        // Before comparing, remove any additional data that was injected into trace data during
+        // span conversion. Note that the keys are renamed on the `SpanData` struct and mostly start
+        // with `sentry.`.
+        let trace = event_from_span.context_mut::<TraceContext>().unwrap();
+        let trace_data = trace.data.value_mut().as_mut().unwrap();
+
+        trace_data.other.retain(|k, v| {
+            if v.value().is_none() || k.starts_with("sentry.") {
+                return false;
+            }
+
+            // Seems to be a special case
+            k != "browser.name"
+        });
+
         assert_eq!(event, event_from_span);
     }