diff --git a/stan/math/rev/core/arena_matrix.hpp b/stan/math/rev/core/arena_matrix.hpp
index d9912eb9adc..a932b3e6570 100644
--- a/stan/math/rev/core/arena_matrix.hpp
+++ b/stan/math/rev/core/arena_matrix.hpp
@@ -10,7 +10,6 @@
 namespace stan {
 namespace math {
 
-
 template <typename MatrixType>
 class arena_matrix<MatrixType, require_eigen_dense_base_t<MatrixType>>
     : public Eigen::Map<MatrixType> {
diff --git a/stan/math/rev/core/vari.hpp b/stan/math/rev/core/vari.hpp
index f3caf6f925a..80da3b0f46d 100644
--- a/stan/math/rev/core/vari.hpp
+++ b/stan/math/rev/core/vari.hpp
@@ -869,8 +869,7 @@ class vari_value<T, require_eigen_sparse_base_t<T>> : public vari_base {
    * that its `chain()` method is not called.
    */
   template <typename S, require_convertible_t<S&, T>* = nullptr>
-  vari_value(S&& x, bool stacked)
-      : adj_(x), val_(std::forward<S>(x)) {
+  vari_value(S&& x, bool stacked) : adj_(x), val_(std::forward<S>(x)) {
     this->set_zero_adjoint();
     if (stacked) {
       ChainableStack::instance_->var_stack_.push_back(this);
diff --git a/stan/math/rev/meta/arena_type.hpp b/stan/math/rev/meta/arena_type.hpp
index a7871313146..095fd53f86f 100644
--- a/stan/math/rev/meta/arena_type.hpp
+++ b/stan/math/rev/meta/arena_type.hpp
@@ -8,7 +8,6 @@
 #include <stan/math/rev/core/chainable_alloc.hpp>
 #include <stan/math/rev/core/var_value_fwd_declare.hpp>
 
-
 namespace stan {
 
 namespace internal {
diff --git a/test/unit/math/rev/core/var_test.cpp b/test/unit/math/rev/core/var_test.cpp
index 0a56f963453..341302b1093 100644
--- a/test/unit/math/rev/core/var_test.cpp
+++ b/test/unit/math/rev/core/var_test.cpp
@@ -9,7 +9,6 @@
 #include <string>
 #include <vector>
 
-
 namespace stan {
 namespace test {
 template <typename T, typename S>
@@ -124,7 +123,8 @@ void ctor_overloads_sparse_matrix(EigenMat&& x) {
   inplace_add_var.adj() += test_y;
   // adjoints sparsity pattern will be pattern of x and test_y for addition
   for (int k = 0; k < x.outerSize(); ++k) {
-    typename vari_value<eigen_plain>::InnerIterator iz(inplace_add_var.adj(), k);
+    typename vari_value<eigen_plain>::InnerIterator iz(inplace_add_var.adj(),
+                                                       k);
     for (inner_iterator it(test_y, k); bool(iz) && bool(it); ++iz) {
       if (iz.row() == it.row() && iz.col() == it.col()) {
         EXPECT_FLOAT_EQ(iz.value() - 1, it.value());