He explained that the figures vindicated the firm's investment of "considerable time and expense" in establishing relationships with some of online retail's biggest technology providers.
Mr Lee added that although the decision to pursue deals with the sector's most important channel integrators was already bearing dividends, further significant increases in parcel numbers were expected in the coming 12 months.
"During the past year, we have taken a succession of major steps forward as a business.
"Channel integrators and technology providers are becoming more important to retailers' ability to develop trade. Striking deals with the most central such operators has put Spring in a healthy position.
"Moreover, though, by allying that facility to our unique role as a broker of 'best-fit' delivery options, we have been able to reinforce that we are a trusted advisor to e-commerce firms both large and small.
"It's that which we believe will allow us to deliver sustained growth in our parcel volumes next year and well into the future."
Investments in technology and key senior staff
Mr Lee outlined how the progress continued the pattern of growth since Managing Director, Steve Ferguson, revamped Spring's commercial policy on his appointment three years ago.
This August - and following the recruitment of key senior staff and investments in technology - Spring disclosed that its range of delivery services had been integrated by the companies behind three of the most influential order management systems and four of the e-commerce platforms used by tens of thousands of British-based online retailers.
Mr Lee suggested that parcel volumes had risen "noticeably" since the partnerships with order and shipping specialists Linnworks, Mintsoft and Scurri as well as e-store providers Magento, WooCommerce, PrestaShop and OpenCart were unveiled in September.