diff --git a/pkg/querier/parquet_queryable.go b/pkg/querier/parquet_queryable.go
index e5bab841604..aaeeb99c5e6 100644
--- a/pkg/querier/parquet_queryable.go
+++ b/pkg/querier/parquet_queryable.go
@@ -450,11 +450,10 @@ func (q *parquetQuerierWithFallback) Select(ctx context.Context, sortSeries bool
 	span, ctx := opentracing.StartSpanFromContext(ctx, "parquetQuerierWithFallback.Select")
 	defer span.Finish()
 
-	newMatchers, shardMatcher, err := querysharding.ExtractShardingMatchers(matchers)
+	newMatchers, shardInfo, err := querysharding.ExtractShardingInfo(matchers)
 	if err != nil {
 		return storage.ErrSeriesSet(err)
 	}
-	defer shardMatcher.Close()
 
 	hints := storage.SelectHints{
 		Start: q.minT,
@@ -501,8 +500,8 @@ func (q *parquetQuerierWithFallback) Select(ctx context.Context, sortSeries bool
 			span, _ := opentracing.StartSpanFromContext(ctx, "parquetQuerier.Select")
 			defer span.Finish()
 			parquetCtx := InjectBlocksIntoContext(ctx, parquet...)
-			if shardMatcher != nil {
-				parquetCtx = injectShardMatcherIntoContext(parquetCtx, shardMatcher)
+			if shardInfo != nil {
+				parquetCtx = injectShardInfoIntoContext(parquetCtx, shardInfo)
 			}
 			p <- q.parquetQuerier.Select(parquetCtx, sortSeries, &hints, newMatchers...)
 		}()
@@ -604,11 +603,15 @@ func (f *shardMatcherLabelsFilter) Close() {
 }
 
 func materializedLabelsFilterCallback(ctx context.Context, _ *storage.SelectHints) (search.MaterializedLabelsFilter, bool) {
-	shardMatcher, exists := extractShardMatcherFromContext(ctx)
-	if !exists || !shardMatcher.IsSharded() {
+	shardInfo, exists := extractShardInfoFromContext(ctx)
+	if !exists {
 		return nil, false
 	}
-	return &shardMatcherLabelsFilter{shardMatcher: shardMatcher}, true
+	sm := shardInfo.Matcher(&querysharding.Buffers)
+	if !sm.IsSharded() {
+		return nil, false
+	}
+	return &shardMatcherLabelsFilter{shardMatcher: sm}, true
 }
 
 type cacheInterface[T any] interface {
@@ -698,16 +701,16 @@ func (n noopCache[T]) Set(_ string, _ T) {
 }
 
 var (
-	shardMatcherCtxKey contextKey = 1
+	shardInfoCtxKey contextKey = 1
 )
 
-func injectShardMatcherIntoContext(ctx context.Context, sm *storepb.ShardMatcher) context.Context {
-	return context.WithValue(ctx, shardMatcherCtxKey, sm)
+func injectShardInfoIntoContext(ctx context.Context, si *storepb.ShardInfo) context.Context {
+	return context.WithValue(ctx, shardInfoCtxKey, si)
 }
 
-func extractShardMatcherFromContext(ctx context.Context) (*storepb.ShardMatcher, bool) {
-	if sm := ctx.Value(shardMatcherCtxKey); sm != nil {
-		return sm.(*storepb.ShardMatcher), true
+func extractShardInfoFromContext(ctx context.Context) (*storepb.ShardInfo, bool) {
+	if si := ctx.Value(shardInfoCtxKey); si != nil {
+		return si.(*storepb.ShardInfo), true
 	}
 
 	return nil, false
diff --git a/pkg/querier/parquet_queryable_test.go b/pkg/querier/parquet_queryable_test.go
index 70baa010b66..3bf11097337 100644
--- a/pkg/querier/parquet_queryable_test.go
+++ b/pkg/querier/parquet_queryable_test.go
@@ -654,13 +654,7 @@ func TestMaterializedLabelsFilterCallback(t *testing.T) {
 					Labels:      []string{"__name__"},
 				}
 
-				buffers := &sync.Pool{New: func() interface{} {
-					b := make([]byte, 0, 100)
-					return &b
-				}}
-				shardMatcher := shardInfo.Matcher(buffers)
-
-				return injectShardMatcherIntoContext(context.Background(), shardMatcher)
+				return injectShardInfoIntoContext(context.Background(), shardInfo)
 			},
 			expectedFilterReturned:   false,
 			expectedCallbackReturned: false,
@@ -676,13 +670,7 @@ func TestMaterializedLabelsFilterCallback(t *testing.T) {
 					Labels:      []string{"__name__"},
 				}
 
-				buffers := &sync.Pool{New: func() interface{} {
-					b := make([]byte, 0, 100)
-					return &b
-				}}
-				shardMatcher := shardInfo.Matcher(buffers)
-
-				return injectShardMatcherIntoContext(context.Background(), shardMatcher)
+				return injectShardInfoIntoContext(context.Background(), shardInfo)
 			},
 			expectedFilterReturned:   true,
 			expectedCallbackReturned: true,
@@ -715,6 +703,30 @@ func TestMaterializedLabelsFilterCallback(t *testing.T) {
 	}
 }
 
+func TestMaterializedLabelsFilterCallbackConcurrent(t *testing.T) {
+	wg := sync.WaitGroup{}
+	wg.Add(10)
+	si := &storepb.ShardInfo{
+		ShardIndex:  0,
+		TotalShards: 2,
+		By:          true,
+		Labels:      []string{"__name__"},
+	}
+	for i := 0; i < 10; i++ {
+		go func() {
+			defer wg.Done()
+			ctx := injectShardInfoIntoContext(context.Background(), si)
+			filter, exists := materializedLabelsFilterCallback(ctx, nil)
+			require.Equal(t, true, exists)
+			for j := 0; j < 1000; j++ {
+				filter.Filter(labels.FromStrings("__name__", "test_metric", "label_1", strconv.Itoa(j)))
+			}
+			filter.Close()
+		}()
+	}
+	wg.Wait()
+}
+
 func TestParquetQueryableFallbackDisabled(t *testing.T) {
 	block1 := ulid.MustNew(1, nil)
 	block2 := ulid.MustNew(2, nil)
diff --git a/pkg/querysharding/util.go b/pkg/querysharding/util.go
index eafc3a71b4f..20d56a53d5c 100644
--- a/pkg/querysharding/util.go
+++ b/pkg/querysharding/util.go
@@ -18,7 +18,7 @@ const (
 )
 
 var (
-	buffers = sync.Pool{New: func() interface{} {
+	Buffers = sync.Pool{New: func() interface{} {
 		b := make([]byte, 0, 100)
 		return &b
 	}}
@@ -79,7 +79,7 @@ func ExtractShardingMatchers(matchers []*labels.Matcher) ([]*labels.Matcher, *st
 		return r, nil, err
 	}
 
-	return r, shardInfo.Matcher(&buffers), nil
+	return r, shardInfo.Matcher(&Buffers), nil
 }
 
 type disableBinaryExpressionAnalyzer struct {