The field of Natural Language Processing (NLP) within the AI industry is rapidly advancing, with numerous companies vying to become the leading players. So, what makes the top five companies in NLP AI stand out? Let's dive in and examine their unique offerings, technology, and market share.

Google reigns supreme, with a plethora of NLP-powered products and services. The Google Cloud Natural Language platform enables developers to extract insights from unstructured text, while TensorFlow is widely utilized for NLP tasks by researchers and developers alike. Not to mention, Google Translate and Google Assistant are widely adopted by businesses and consumers.

Microsoft, another giant in the NLP AI industry, boasts Azure Cognitive Services - a collection of pre-built APIs for NLP, computer vision, and speech recognition, allowing for effortless integration of intelligence into applications and services. The tech giant also boasts its own language model, Microsoft Translator, frequently used for language translation.

OpenAI, a pioneering research organization in the AI industry, has NLP as one of its main focuses. The highly acclaimed GPT-3 is considered one of the most powerful NLP models available today and is widely used by researchers and developers for various NLP tasks.

Amazon offers NLP services such as Amazon Transcribe for audio transcription and Amazon Translate for text translation. The company's machine learning-powered Amazon Comprehend service also offers insights and relationships in text.

Hugging Face, a leading platform for NLP models, boasts a library of pre-trained models that can be fine-tuned for various NLP tasks. With a massive community of contributors and developers, the company has made substantial contributions to NLP with their transformers models.

In conclusion, the top five companies leading the NLP AI industry - Google, Microsoft, OpenAI, Amazon, and Hugging Face - each have their own unique strengths and areas of expertise. Google is known for TensorFlow and AI-powered products, Microsoft for Azure Cognitive Services, OpenAI for GPT-3 and friendly AI, Amazon for its comprehensive AI services, and Hugging Face for its pre-trained models library and community contributions. The ideal choice of an NLP AI provider ultimately depends on the specific needs and requirements of an organization.