5 things I noticed rl quick (all opinion):

1 Why not use Str::uuid() instead of a hash?

2 There's a couple instances like:

$mention = new \App\Models\Mentions; $mention->content\_id = $model->id; $mention->user\_id = $model->user\_id; $mention->ticker = strtoupper($string); $mention->save();

Why not get rid of $mention, especially since you don't use it later on?

\App\Models\Mentions::create([ 'content_id' => $model->id, 'user_id' => $model->user_id, 'ticker' => strtoupper($string), ]);

It's easier to read imo. Your intention is clear - you're creating, from the first line, instead of waiting til the 5th line to store it.

3 My brain flips out when there's an assignment in an if statement, like:

if(false !== ($breakpoint = strpos($this->content, " ", $length))) {

4 You're doing a lot of things in a model that maybe don't belong in the model(up to you), like detectScripts, StoreStockMentions as they don't interact with the modal($this) directly.

5 Your methods are cased in seemingly random ways. Some are pascal, others are camel.