Mass Stock Update by Innobyte. Innobyte's Magento extension "Mass Stock Update" works like a charm when it comes to updating in a few seconds all your stocks. This extension is easy to install and very easy to manage. No matter how many products you choose to update, this extension will ease up the process.
Key features: Allows admins to easily edit stock for products; Supports an unlimited number of products; Permits updating both stock level and price level; Stocks can be now updated directly from your CVS document; Automatically creates button for Stock Update in Back-end; Depending on the information from the uploaded CVS document of stock levels, there can be 3 product scenarios: The quantity is zero - then the product will be marked on front-end as "Out-of-Stock", Quantity is bigger than zero - the product is available for clients, Quantity is missing - the product is ignored. Other extension features: Easy and friendly administration; Meets Magento programming practices; Magento Compatibility CE 1.7 and EE 1.12; 30 day money back guarantee; Cross-browser compatibility: : IE8, IE9, Firefox (v19), Chrome (v25), Safari (v.5.1.7), Opera (9.8 v12), Safari (v 5.1.7). We are Magento Partner.
Magento CE or EE