Thomas Durkin
Analyst · KBW
Thank you, David, and good morning everyone. During the quarter, we executed another accretive opportunity to strengthen our capital base by redeeming approximately 500,000 shares of preferred stock at a slight discount in exchange for 2.8 million shares of common stock. We also successfully utilized our ATM program during the quarter to raise net proceeds of approximately $10 million through the issuance of 2.2 million shares of common stock at a weighted average price of $4.53 per share. We reinvested that capital during the quarter into residential asset classes, including both non-QM loans and agency whole pools.
Turning to our presentation on Page 5, we present the first quarter portfolio update. As previously mentioned on our last quarterly earnings call, we sold 2 of our 4 remaining commercial real estate whole loans at prices slightly above our year-end marks. During the quarter, we increased the size of the portfolio from $1.4 billion to $1.9 billion, mainly through agency purchases of approximately $443 million and non-QM whole loan purchases of approximately $209 million. Across the bottom table, you can see we continue to prudently increase the earnings power of the portfolio while maintaining adequate liquidity.
Turning to Slide 6, you can see the allocation of equity among residential credit investments, agency MBS and commercial investments. During the quarter, we made continued progress shifting the portfolio into residential loans, which now represent over 60% of the portfolio, and deploying excess liquidity into agency MBS to keep liquid NIM in the portfolio as we continue to build out a pipeline of residential loans.
Moving to Slide 7, we took advantage of strong credit markets within the first quarter to sell securities, which we were passive owners in and not related to our securitizations or whole loan activity. Along with other Angelo Gordon funds, we also completed a non-QM securitization subsequent to quarter end and have increased our borrowing capacity on warehouse lines for further acquisitions.
On Slide 8, you can see we continue to be able to create an agency MBS book with better prepayment performance to the market due to our size and selectiveness when purchasing spec pools.
On Slide 9, you can see our CRE and CMBS exposure continues to shrink given the 2 CRE loan sales mentioned earlier along with other CMBS sales during the quarter. Subsequent to quarter end, we exited all our remaining Freddie K multi-family securities. At this point, our commercial exposure is less than 5% of our overall investment portfolio, with 2 commercial real estate loans left and 3 CMBS single asset, single borrower securities remaining. We believe there is further book value upside remaining in these assets, and we'll prudently continue to manage this exposure down while being disciplined on the exit prices.
Now turning to Slide 10, we want to, again, highlight the strong performance of Arc Home, our licensed mortgage origination affiliate during the first quarter. During the quarter, the team at Arc continued to take advantage of the talent in the mortgage banking sector with another strong quarter in both volume and margins within the agency channels.
And as we stated on previous earnings calls, Arc Home was one of the first originators to reenter the non-QM business post-COVID, and you can see clearly how this product represented an increasing percentage of Arc's fundings since. We believe this early re-entry into non-QM built strong brand awareness and recognition for Arc Home in the non-agency correspondent and wholesale markets as the agency refi wave begins to recede over the near- to medium-term.
We've provided additional detail on Arc's funding volumes by channel, product and overall gain on sale margin for reference in the chart here on Slide 10. I'll point out post quarter end, we have seen margins in the agency space continued to narrow due to both interest rates and some GSE implementation affecting certain forms of delivery into the cash window. And just as a reminder, MITT owns approximately 45% of Arc Home and the remainder is owned by other Angelo Gordon managed funds.
So for me, wrapping up, we're pleased with the progress we made over the last year, simplifying our asset mix and balance sheet to be focused on growing our residential whole loans in concert with the growth from Arc Home while maintaining a prudent balance of agency mortgages for both earnings power and liquidity. We think there is a lot happening within the mortgage origination ecosystem, which MITT will be well-positioned to take advantage of. As I look ahead, I'm very excited to have Nick Smith on our team to help us execute on this strategy as the CIO of MITT.
With that, I'll turn the call over to Nick.