JSFiddle - React, Tailwind, and code Playground

HTML

<div class="companies-logos">
  <ul>
    <li><img src="https://rt-group.co.il/wp-content/uploads/2018/02/spectronix-logo.png"></li>
    <li><img src="https://rt-group.co.il/wp-content/uploads/2018/02/abbot-logo.png"></li>
    <li><img src="https://rt-group.co.il/wp-content/uploads/2018/02/Logo-Flextronics.png"></li>
    <li><img src="https://rt-group.co.il/wp-content/uploads/2018/02/audiocodes-limited-logo-1.png"></li>
    <li><img src="https://rt-group.co.il/wp-content/uploads/2018/02/stjude-logo.png" class="correctMe"></li>
    <li><img src="https://rt-group.co.il/wp-content/uploads/2018/02/OpGal.png"></li>
    <li><img src="https://rt-group.co.il/wp-content/uploads/2018/02/Logo-HP_Indigo.png"></li>
    <li><img src="https://rt-group.co.il/wp-content/uploads/2018/02/Electra_Logo.png"></li>
    <li><img src="https://rt-group.co.il/wp-content/uploads/2018/02/intel-logo.png"></li>
    <li><img src="https://rt-group.co.il/wp-content/uploads/2018/02/spectronix-logo.png"></li>
    <li><img src="https://rt-group.co.il/wp-content/uploads/2018/02/abbot-logo.png"></li>
  </ul>
</div>

CSS

.companies-logos {
  margin-top: 130px;
  display: flex;
  flex-flow: row nowrap;
  align-items: center;
  justify-content: space-between;
  height: 120px;
  overflow: hidden;
  background: #3A3C42;
}

.companies-logos ul {
  display: flex;
}

.companies-logos ul li {
  margin: 0 25px;
}

.companies-logos ul li img {
  width: auto;
  height: 90px;
  max-width: 300px;
}

JavaScript

$(function(){  
  setInterval(function(){  
    var item_width = $('.companies-logos ul li:first-child').width() + 25;
    console.log(item_width);
    $(".companies-logos ul li:first-child").animate({"margin-left": -item_width}, 2000, function(){  
        $(this).css("margin-left",25).appendTo(".companies-logos ul");  
    });  
  }, 1000);  
});