Daniel Rosenthal
Analyst · Morgan Stanley
Thanks, Alex, and good morning, everyone. The first quarter of 2021 was a successful one across both our growth and profitability measures, and we are really proud of how our team hit the ground running. You will find our full GAAP financial results contained in the shareholder letter we published yesterday evening and here are some highlights.
On the top line, we grew direct written premium 23% year-over-year to $203 million, our first quarter over $200 million. This also represents sequential growth of 39% above Q4. March was particularly strong, and we believe some demand may have been pulled forward from April and May due to government stimulus. Also, as a result of the timing of the written premium growth, our direct earned premium increased 11% year-over-year to $160 million.
Shifting to profitability, direct loss ratio was 71% for the first quarter, including approximately $10 million of favorable direct prior period development, primarily impacting accident year 2020. Adjusting for the impact of that prior development, direct accident period loss ratio totaled 77%, a 3-point improvement year-over-year against Q1 2020 and a 29-point improvement from Q1 2019, removing noise related to the pandemic.
Direct contribution, really the key profitability metric for the business, was $27 million for the quarter, a big improvement from a loss of $11 million in Q1 2020. Direct contribution was 17% of direct earned premium for the quarter. The improvement in direct contribution was driven primarily by the direct loss ratio as I covered above.
The first quarter tends to be stronger seasonally as customers are out shopping. And the impact of stimulus and return to work has fueled car demand. That created a great marketing environment for us, providing momentum towards our growth goals. As Alex mentioned, we're investing heavily to ensure we can scale our customer acquisition spend over the long-term while keeping the CAC profile of the business intact. To this end, we continued our Test and Invest approach in Q1 to build a broader set of acquisition channels.
We mentioned on our Q4 call that our state management activity contributed significantly to our loss ratio results, and that has continued in Q1. We are managing the business at a state level, adjusting pricing where necessary. In the quarter, we completed 8 filings. The state management Team successfully added an additional state to our seasoned portfolio. This portfolio expansion and targeted investment in seasoned states drove seasoned premiums to 73% of earned premiums in Q1 along with a sequentially better seasoned loss ratio.
So for the first quarter, we have a lot of good momentum in our existing markets, and we're hard at work expanding into new states. We now have the required licenses to operate in 48 states. Licensure is the necessary and challenging first step to writing policies, and we now are in the process of filing our product, forms and pricing models in multiple states. We will share more on our progress here in the coming months.
We run the business on a direct basis, and it's on my team and me to manage the capital and reinsurance components of the business. To that end, I am pleased to announce that we have successfully placed a multiyear reinsurance treaty with a panel that includes current relationships as well as a few new names. By shifting the date to April 1, we were able to attain better terms by also building better alignment with our reinsurance partners, all of which is in line with guidance we provided you on our Q4 call. We are excited about the breadth and strength of our reinsurance programs as they remain a key component of capital structure.
We are very encouraged by what we accomplished in our first quarter. We grew the business the right way, taking advantage of a strong demand environment and we delivered solid improvement in direct contribution and accident period loss ratio. Our Q1 results demonstrate that our business model is working. That said, 1 quarter does not a year make, and our team remains laser-focused on delivering the expectations that we have shared.
With that, Alex and I look forward to your questions.