<? $args = array(
    'post_type' => 'post',
    'posts_per_page' => 3,
    'category__not_in' => array( 268, 269 )
  );
$homePosts = new WP_Query($args);

$args = array(
    'post_type' => 'post',
    'category_name' => 'in-the-media',
    'posts_per_page' => 3
  );
$inthemediaPosts = new WP_Query($args);

$args = array(
  'post_type' => 'post',
  'category_name' => 'bt-insights',
  'posts_per_page' => 3
);
$insightsPosts = new WP_Query($args);

$allqueries = array($homePosts,$inthemediaPosts,$insightsPosts);
foreach ($allqueries as $myquery) {
  while ($myquery->have_posts()) : $myquery->the_post(); ?>

$insightsPosts = new WP_Query($args);

for ($i = 0; $i < 3; $i++) {
    if ($homePosts->post_count > $i)
        echo $homePosts->posts[$i]->post_title;
    if ($inthemediaPosts->post_count > $i)
        echo $inthemediaPosts->posts[$i]->post_title;
    if ($insightsPosts->post_count > $i)
        echo $insightsPosts->posts[$i]->post_title;
}

while($allqueries[0]->have_posts() || $allqueries[1]->have_posts() || $allqueries[2]->have_posts()) {
  if ($allqueries[0]->have_posts()) $allqueries[0]->the_post();
  if ($allqueries[1]->have_posts()) $allqueries[1]->the_post();
  if ($allqueries[2]->have_posts()) $allqueries[2]->the_post();
}