Bruce Spohler
Analyst · Evercore
Thank you, Nick. Let me start by giving an overview of our portfolio. At quarter's end, the fair market value of our investment portfolio was approximately $1 billion. The fair value weighted averaged yield on our income-producing investments was approximately 14.3%, consistent with the 14.2% yield at the end of Q4. As of 3/31, our portfolio consisted of 41% senior secured debt, 52% subordinated debt and 7% co-invest equities. We had investments in 34 portfolio companies operating across 20 industries.
I'll now take a moment to provide a little color on our Q1 investment activity. During the first quarter, we received approximately $106 million of repayments, all at or above par and all at or above our prior quarter's marks. We experienced full redemptions from 2 of our remaining 2007 vintage credit assets. Our $19 million par value investment in Magnolia was redeemed in conjunction with the company's refinancing, and our $27 million PIK investment in AMC Theatres was also redeemed. In addition, our investments in Roundy's, Vanpool and Shoes For Crews were also repaid in full. These assets continue to demonstrate the pull to par scenario, which we expect in our current portfolio as investments are repaid.
In addition to our payments, we actively sold shares of NXP, generating $8.5 million in proceeds. NXP share price nearly doubled during the first quarter and we were able to sell into this strength. Despite having sold nearly half of our remaining position, the 3/31 value of our remaining NXP position is approximately similar to the 12/31 fair value that we held. We will continue to sell these shares opportunistically and recycle the proceeds into income-producing investments.
We also received approximately $21 million from the sale of our equity investment in National Specialty Alloys to Reliance Steel. We had originally invested $10 million in 2007, representing an $11 million realized gain. Together with the dividends that we've received over the life of our investment, our IRR is approximately 30%. These realizations, which were all at or above our cost, speak to both our conservative valuation methodology as well as the benefit of our long-term, patient investment approach.
Post quarter end, we finalized the recapitalization of our investment in DS Waters. We and other note holders exchanged our PIK notes into participating preferred equity. The resulting security has a dividend rate and liquidation preference consistent with our prior notes. Our resulting attachment point in the capital structure continues to be at 3.2x leverage. Importantly, our group received the majority of the company's common equity, control of the board and we'll have control over all significant corporate actions, including refinancing and monetization events.
Since our last update, the company has continued to outperform its budget. Customer growth in Q1 was the best that the company has seen in nearly 10 years. In addition, DS Waters closed on a sizable acquisition of a coffee business, and they are currently in the process of integrating this company into their operations. In connection with the recapitalization of DS Waters, we invested approximately $30 million in the new second lien secured loan facility. We view this as a strategic investment having a highly attractive risk-reward profile with a leverage attachment point at 2.5x, ending at 3.2x. The market currently values DS Waters loans at approximately par.
During the first quarter, we invested over $60 million par value in 5 existing portfolio companies. We view these follow-on or add-on investments as extremely attractive opportunities to put additional capital to work and extend our duration in businesses with healthy fundamentals that we have observed from prior investment. As Michael mentioned, refinancing activity during the first quarter was high. We took advantage of attractive follow-on and refinancing opportunities in our existing portfolio companies where we were very comfortable to fundamentals and business prospects. In the first quarter, new investments had an average leverage to our security of below 4x. We originated a $7 million investment in ViaWest incremental second lien notes, bringing our total investment in the company to approximately $40 million. As a reminder, ViaWest is owned by Oak Hill and is one of the nation's largest privately-held data center operators with over 20 centers located predominantly in the Pacific and Mountain West. The incremental capital will help fund new data center build outs in 2012 and '13. The all-in yield on our investment is in the high 13% area. In connection with our financing, we were able to extend the duration on the asset for our portfolio. In addition, we invested $12 million in Asurion's new subordinated term loan and continue to hold an investment in the company's second lien term loan. Asurion is the leading global provider of warranty services, cell phones. We first invested in this company in 2007. And given it's strong credit profile, which was maintained throughout the financial crisis, we have participated in multiple refinancings and follow-on opportunities. The yield on this new loan exceeds 11% with leverage in the mid-4x. We also increased our position by $10 million in the subordinated notes of MidCap Finance, which is a secured lender to healthcare-related companies. MidCap has low leverage with total debt-to-equity of under 3x, and it's portfolio of loans is diversified across over 90 different issuers with an average loan size of approximately $9 million. This transaction resulted in the repricing of our existing notes to 13% and extended our expected duration. We first invested in this company with a $25 million investment in 2010 and had been extremely pleased with its performance.
To date, we have no visibility of additional repayments during Q2. We do, however, have strong conviction around Q2 being an active quarter for originations, which will grow and further diversify value our portfolio.
Now I'll turn the call back to Michael.