diff --git a/src/Plugins/Shard.php b/src/Plugins/Shard.php
index 988b3a4b..fa5f14c7 100644
--- a/src/Plugins/Shard.php
+++ b/src/Plugins/Shard.php
@@ -199,15 +199,14 @@ final class Shard implements AddsOutput, HandlesArguments, Terminable
      */
     private function allTests(array $arguments): array
     {
-        $output = new Process([
-            'php',
-            ...$this->removeParallelArguments($arguments),
-            '--list-tests',
-        ])->setTimeout(120)->mustRun()->getOutput();
+        $command = $this->buildListTestsCommand(
+            $arguments,
+            TestSuite::getInstance()->testPath,
+        );
 
-        preg_match_all('/ - (?:P\\\\)?(Tests\\\\[^:]+)::/', $output, $matches);
+        $output = (new Process($command))->setTimeout(120)->mustRun()->getOutput();
 
-        return array_values(array_unique($matches[1]));
+        return $this->parseListTestsOutput($output);
     }
 
     /**
@@ -216,7 +215,36 @@ final class Shard implements AddsOutput, HandlesArguments, Terminable
      */
     private function removeParallelArguments(array $arguments): array
     {
-        return array_filter($arguments, fn (string $argument): bool => ! in_array($argument, ['--parallel', '-p'], strict: true));
+        return array_values(array_filter(
+            $arguments,
+            fn (string $argument): bool => ! in_array($argument, ['--parallel', '-p'], strict: true)
+                && ! str_starts_with($argument, '--processes'),
+        ));
+    }
+
+    /**
+     * Builds the subprocess command used to enumerate tests via `--list-tests`.
+     *
+     * @param  list<string>  $arguments
+     * @return list<string>
+     */
+    private function buildListTestsCommand(array $arguments, string $testPath): array
+    {
+        $filtered = $this->removeParallelArguments($arguments);
+
+        return ['php', ...$filtered, '--test-directory='.$testPath, '--list-tests'];
+    }
+
+    /**
+     * Parses `--list-tests` output into a unique list of test class FQCNs.
+     *
+     * @return list<string>
+     */
+    private function parseListTestsOutput(string $output): array
+    {
+        preg_match_all('/ - (?:P\\\\)?([A-Za-z_]\w*(?:\\\\[A-Za-z_]\w*)*)::/', $output, $matches);
+
+        return array_values(array_unique($matches[1]));
     }
 
     /**
diff --git a/tests/.snapshots/success.txt b/tests/.snapshots/success.txt
index e7ebe7b8..7d9ce277 100644
--- a/tests/.snapshots/success.txt
+++ b/tests/.snapshots/success.txt
@@ -1983,4 +1983,4 @@
   ✓ pass with dataset with ('my-datas-set-value')
   ✓ within describe → pass with dataset with ('my-datas-set-value')
 
-  Tests:    2 deprecated, 4 warnings, 5 incomplete, 2 notices, 40 todos, 35 skipped, 1370 passed (3068 assertions)
\ No newline at end of file
+  Tests:    2 deprecated, 4 warnings, 5 incomplete, 2 notices, 40 todos, 35 skipped, 1370 passed (3068 assertions)
diff --git a/tests/Unit/Plugins/Shard.php b/tests/Unit/Plugins/Shard.php
index bd5a5e06..347a3035 100644
--- a/tests/Unit/Plugins/Shard.php
+++ b/tests/Unit/Plugins/Shard.php
@@ -232,11 +232,209 @@ describe('handleArguments', function () {
         $reflection = new ReflectionClass($shard);
         $method = $reflection->getMethod('removeParallelArguments');
 
-        $arguments = ['bin/pest', '--parallel', 'tests/', '-p'];
+        $arguments = ['bin/pest', '--parallel', '--processes=4', 'tests/', '-p'];
 
         $result = $method->invoke($shard, $arguments);
 
-        expect($result)->toBe([0 => 'bin/pest', 2 => 'tests/']);
+        expect($result)->toBe(['bin/pest', 'tests/']);
+    });
+});
+
+describe('parseListTestsOutput', function () {
+    it('parses Tests\\ namespaced classes from --list-tests output', function () {
+        $output = new BufferedOutput;
+        $shard = new Shard($output);
+
+        $reflection = new ReflectionClass($shard);
+        $method = $reflection->getMethod('parseListTestsOutput');
+
+        $listOutput = <<<'OUT'
+ INFO  Available tests:
+
+ - P\Tests\Features\After::__pest_evaluable_it_runs
+ - P\Tests\Features\After::__pest_evaluable_it_runs_twice
+ - P\Tests\Unit\Foo::test_bar
+OUT;
+
+        expect($method->invoke($shard, $listOutput))->toBe([
+            'Tests\\Features\\After',
+            'Tests\\Unit\\Foo',
+        ]);
+    });
+
+    it('deduplicates repeated class names from multiple test methods', function () {
+        $output = new BufferedOutput;
+        $shard = new Shard($output);
+
+        $reflection = new ReflectionClass($shard);
+        $method = $reflection->getMethod('parseListTestsOutput');
+
+        $listOutput = <<<'OUT'
+ - P\Tests\Same::method_a
+ - P\Tests\Same::method_b
+ - P\Tests\Same::method_c
+OUT;
+
+        expect($method->invoke($shard, $listOutput))->toBe(['Tests\\Same']);
+    });
+
+    it('returns an empty list for output with no matching lines', function () {
+        $output = new BufferedOutput;
+        $shard = new Shard($output);
+
+        $reflection = new ReflectionClass($shard);
+        $method = $reflection->getMethod('parseListTestsOutput');
+
+        expect($method->invoke($shard, ''))->toBe([])
+            ->and($method->invoke($shard, 'some random text'))->toBe([]);
+    });
+
+    it('parses non-Tests namespaced classes', function () {
+        $output = new BufferedOutput;
+        $shard = new Shard($output);
+
+        $reflection = new ReflectionClass($shard);
+        $method = $reflection->getMethod('parseListTestsOutput');
+
+        $listOutput = <<<'OUT'
+ - P\Acme\Sharding\OneTest::test_foo
+ - P\Acme\Sharding\TwoTest::test_bar
+ - App\Suite\BazTest::test_qux
+OUT;
+
+        expect($method->invoke($shard, $listOutput))->toBe([
+            'Acme\\Sharding\\OneTest',
+            'Acme\\Sharding\\TwoTest',
+            'App\\Suite\\BazTest',
+        ]);
+    });
+
+    it('parses unnamespaced top-level classes', function () {
+        $output = new BufferedOutput;
+        $shard = new Shard($output);
+
+        $reflection = new ReflectionClass($shard);
+        $method = $reflection->getMethod('parseListTestsOutput');
+
+        expect($method->invoke($shard, ' - P\FooTest::test_bar'))->toBe(['FooTest']);
+    });
+
+    it('strips the P\\ Pest prefix but keeps the rest of the FQCN', function () {
+        $output = new BufferedOutput;
+        $shard = new Shard($output);
+
+        $reflection = new ReflectionClass($shard);
+        $method = $reflection->getMethod('parseListTestsOutput');
+
+        $listOutput = <<<'OUT'
+ - P\Acme\OneTest::a
+ - Acme\TwoTest::b
+OUT;
+
+        expect($method->invoke($shard, $listOutput))->toBe([
+            'Acme\\OneTest',
+            'Acme\\TwoTest',
+        ]);
+    });
+
+    it('ignores junk lines that lack the " - …::" framing', function () {
+        $output = new BufferedOutput;
+        $shard = new Shard($output);
+
+        $reflection = new ReflectionClass($shard);
+        $method = $reflection->getMethod('parseListTestsOutput');
+
+        $listOutput = <<<'OUT'
+ INFO  Available tests:
+
+There were errors:
+garbage ::: not a test
+ - P\Acme\RealTest::method
+OUT;
+
+        expect($method->invoke($shard, $listOutput))->toBe(['Acme\\RealTest']);
+    });
+});
+
+describe('buildListTestsCommand', function () {
+    it('builds the list-tests command with the forwarded --test-directory', function () {
+        $output = new BufferedOutput;
+        $shard = new Shard($output);
+
+        $reflection = new ReflectionClass($shard);
+        $method = $reflection->getMethod('buildListTestsCommand');
+
+        $command = $method->invoke($shard, ['bin/pest', '--update-shards'], 'custom/suite');
+
+        expect($command)->toBe([
+            'php',
+            'bin/pest',
+            '--update-shards',
+            '--test-directory=custom/suite',
+            '--list-tests',
+        ]);
+    });
+
+    it('strips --parallel and -p when building the list-tests command', function () {
+        $output = new BufferedOutput;
+        $shard = new Shard($output);
+
+        $reflection = new ReflectionClass($shard);
+        $method = $reflection->getMethod('buildListTestsCommand');
+
+        $command = $method->invoke($shard, ['bin/pest', '--parallel', '--update-shards', '-p'], 'tests');
+
+        expect($command)->toBe([
+            'php',
+            'bin/pest',
+            '--update-shards',
+            '--test-directory=tests',
+            '--list-tests',
+        ]);
+    });
+
+    it('forwards --test-directory even when input arguments include one', function () {
+        $output = new BufferedOutput;
+        $shard = new Shard($output);
+
+        $reflection = new ReflectionClass($shard);
+        $method = $reflection->getMethod('buildListTestsCommand');
+
+        $command = $method->invoke($shard, ['bin/pest'], 'suites');
+
+        expect($command)->toContain('--test-directory=suites');
+    });
+
+    it('strips --processes=N when building the list-tests command', function () {
+        $output = new BufferedOutput;
+        $shard = new Shard($output);
+
+        $reflection = new ReflectionClass($shard);
+        $method = $reflection->getMethod('buildListTestsCommand');
+
+        $command = $method->invoke($shard, ['bin/pest', '--parallel', '--processes=4', '--update-shards'], 'tests');
+
+        expect($command)->toBe([
+            'php',
+            'bin/pest',
+            '--update-shards',
+            '--test-directory=tests',
+            '--list-tests',
+        ]);
+    });
+
+    it('strips --processes N (space-separated) when building the list-tests command', function () {
+        $output = new BufferedOutput;
+        $shard = new Shard($output);
+
+        $reflection = new ReflectionClass($shard);
+        $method = $reflection->getMethod('buildListTestsCommand');
+
+        $command = $method->invoke($shard, ['bin/pest', '--parallel', '--processes', '4', '--update-shards'], 'tests');
+
+        expect($command)->not->toContain('--processes')
+            ->and($command)->toContain('--update-shards')
+            ->and($command)->toContain('--test-directory=tests');
     });
 });