There's an example of this in the lwc-recipes repository published by salesforce.com.
Your JS should look like:
import { wire, LightningElement } from 'lwc';
import getAllCompanys from '@salesforce/apex/StockMarketSharesWrapper.getAllCompanys';
export default class MyLwcComponent extends LightningElement {
@wire(getAllCompanys, {}) companys;
columns = [{ label: 'Name', fieldName: 'Name' }, { label: 'Ticker', fieldName: 'Ticker' }]
}
And your HTML can look like:
<template>
<lightning-datatable data={companys.data} columns={columns} key-field="Name">
</lightning-datatable>
</template>
See also the lightning-datatable documentation.
Edit: Your Apex is reusing the same variable, despite creating new wrappers; this is why most of your data would be blank.
Wrapper w = new Wrapper();
w.Ticker = 'U';
w.Name = 'Unity Software Inc';
Wrapper w1 = new Wrapper();
w1.Ticker = 'UAL';
w1.Name = 'United Airlines Holdings, Inc.' ;
Wrapper w2 = new Wrapper();
w2.Ticker ='DAOOU' ;
w2.Name = 'Crypto 1 Acquisition Corp Unit';
Wrapper w3 = new Wrapper();
w3.Ticker = 'GLLIU';
w3.Name ='Globalink Investment Inc. Unit' ;
Edit 2: There was a .data missing in the template. I build the entire thing in to a gist.