What was the revenue growth rate for the fourth quarter of 2020 compared to the same quarter last year
also able to get higher pricing than typical commodity products, which is also a key part of our strategy. Another example of our rapid release strategy is when we recently announced a notable win with ADT. As 5G is deployed widely operators can free up spectrum by sunsetting old technologies such as 3G or 4G as it turns out.
However, their existing applications such as home security systems that use the 3G technology and that need an upgrade. CellBounce, which is a division of ADT needed a very stable timing solution that will enable the successful 3G to 4G conversion of existing home security panels without expensive truck rolls. To enable this conversion, CellBounce's performance requirements were stringent, but we're able to rapidly optimize our elite platform, Super-TCXO to meet these requirements resulting in a SiTime solution that delivers 10 times better performance than the existing solutions. On the state of the semiconductor business today, I wanted to make a few comments on the industry dynamics and supply chain since that's top of mind for a lot of people.
The quartz industry has continued to be disrupted most recently by a fire at a supplier to the quartz industry. This impacted supply chain and manufacturing capacity. This market -- these market dynamics have created opportunities for SiTime because of our responsiveness, we've been able to secure incremental opportunities and wins across a number of new and existing customers. Further on this, our fabulous multi-source supply chain continues to serve as a strategic advantage for SiTime, especially during periods of tightness in the broader supply chain.
While we have seen lead times increase in recent months, we continue to work closely with customers to deliver products in the time that they need. Our suppliers were also the suppliers to the semiconductor industry in general view SiTime's MEMS timing solutions as a growth opportunity that is in fact a net addition to the total available market or the TAM. So basically, our silicon timing solutions are bringing additional TAM to the semiconductor industry as we are replacing non-semiconductor solution quartz. In conclusion, we continue to extend SiTime's leadership in timing, and we remain uniquely positioned to continue to disrupt the market with our ability to offer complete timing solutions.
The timing itself, as I said before is a critical function that is increasingly important as faster connectivity becomes more and more relevant, more and more ubiquitous. Our systems knowledge and having the three product categories in-house uniquely oscillators, clocks, and resonators allows us to better design products for our customers and solve the world's tough timing problems. With that, I'll now turn over the call to Art to discuss our fourth-quarter results in more detail, and provide our outlook for the first quarter of 2021. Art.
Art Chadwick -- Chief Financial Officer
Great. Thanks, Rajesh, and good afternoon everyone. During my review today, I'll discuss the fourth-quarter 2020 financial results and provide some guidance for the first quarter of 2021. I'll focus my discussion on non-GAAP financial results, and refer you to today's press release for a detailed description of our GAAP results as well as a reconciliation of GAAP to non-GAAP results, which for us exclude stock-based compensation and related payroll tax expense.
So to begin with, the fourth quarter was a record quarter on multiple fronts. We had strong revenue growth, continued gross margin expansion, and record non-GAAP net income. We increased revenue guidance mid-quarter and actual results exceeded that mid-quarter guidance. Revenue for the quarter was $40.3 million, up 23% sequentially, and up 33% over the same quarter last year.
Revenue for the full year was $116.2 million, up 38% year over year. To provide some color on end markets, our report sales by market group, as I have in the past. The first is mobile IoT and consumer, which consists primarily of sales of mobile phones, wearable devices, and consumer products. Sales into this se
also able to get higher pricing than typical commodity products, which is also a key part of our strategy. Another example of our rapid release strategy is when we recently announced a notable win with ADT. As 5G is deployed widely operators can free up spectrum by sunsetting old technologies such as 3G or 4G as it turns out.
However, their existing applications such as home security systems that use the 3G technology and that need an upgrade. CellBounce, which is a division of ADT needed a very stable timing solution that will enable the successful 3G to 4G conversion of existing home security panels without expensive truck rolls. To enable this conversion, CellBounce's performance requirements were stringent, but we're able to rapidly optimize our elite platform, Super-TCXO to meet these requirements resulting in a SiTime solution that delivers 10 times better performance than the existing solutions. On the state of the semiconductor business today, I wanted to make a few comments on the industry dynamics and supply chain since that's top of mind for a lot of people.
The quartz industry has continued to be disrupted most recently by a fire at a supplier to the quartz industry. This impacted supply chain and manufacturing capacity. This market -- these market dynamics have created opportunities for SiTime because of our responsiveness, we've been able to secure incremental opportunities and wins across a number of new and existing customers. Further on this, our fabulous multi-source supply chain continues to serve as a strategic advantage for SiTime, especially during periods of tightness in the broader supply chain.
While we have seen lead times increase in recent months, we continue to work closely with customers to deliver products in the time that they need. Our suppliers were also the suppliers to the semiconductor industry in general view SiTime's MEMS timing solutions as a growth opportunity that is in fact a net addition to the total available market or the TAM. So basically, our silicon timing solutions are bringing additional TAM to the semiconductor industry as we are replacing non-semiconductor solution quartz. In conclusion, we continue to extend SiTime's leadership in timing, and we remain uniquely positioned to continue to disrupt the market with our ability to offer complete timing solutions.
 The timing itself, as I said before is a critical function that is increasingly important as faster connectivity becomes more and more relevant, more and more ubiquitous. Our systems knowledge and having the three product categories in-house uniquely oscillators, clocks, and resonators allows us to better design products for our customers and solve the world's tough timing problems. With that, I'll now turn over the call to Art to discuss our fourth-quarter results in more detail, and provide our outlook for the first quarter of 2021. Art.
Art Chadwick -- Chief Financial Officer
Great. Thanks, Rajesh, and good afternoon everyone. During my review today, I'll discuss the fourth-quarter 2020 financial results and provide some guidance for the first quarter of 2021. I'll focus my discussion on non-GAAP financial results, and refer you to today's press release for a detailed description of our GAAP results as well as a reconciliation of GAAP to non-GAAP results, which for us exclude stock-based compensation and related payroll tax expense.
So to begin with, the fourth quarter was a record quarter on multiple fronts. We had strong revenue growth, continued gross margin expansion, and record non-GAAP net income. We increased revenue guidance mid-quarter and actual results exceeded that mid-quarter guidance. Revenue for the quarter was $40.3 million, up 23% sequentially, and up 33% over the same quarter last year.
Revenue for the full year was $116.2 million, up 38% year over year. To provide some color on end markets, our report sales by market group, as I have in the past. The first is mobile IoT and consumer, which consists primarily of sales of mobile phones, wearable devices, and consumer products. Sales into this se