Anatomy of a deal: How NxLite closed its oversubscribed Series A round

In a tight capital market, CEO David Mather strategically focused on reducing the risks that investors care about the most.

Fundraising rarely follows a straight line. Even with a term sheet in hand, deals can quickly shift as investor priorities change. NxLite, a cleantech company that develops energy efficient window coatings, learned this firsthand during its Series A round. What looked like a straightforward process required months of deliberate work.

“You think you’re there, you have a term sheet, you think you’re ready to go,” says CEO David Mather. “And then everything starts falling apart.”

In a market where capital is scarce, climate and hardware companies face heightened scrutiny, and many funding rounds are stalling. But NxLite’s didn’t. What began as a $3-million convertible note last August turned into a $6.4-million first close. Then over a 120-day second close window, the company brought in additional capital, ultimately raising $13.1 million and oversubscribing its original $10-million target.

The outcome wasn’t the result of momentum alone. It reflected a deliberate approach — one that began months before the round formally opened.

Here, Mather and Jason Blumberg, managing partner at Earth Foundry and one of the investors in the deal, break down how the deal was done.

Before the deal: Reducing risk before raising capital

Recruiting a CEO to derisk the tech: Eventually, every startup reaches a transition point when questions about the business begin to change. Once the technology has been validated, investors want to know if the company is structured to scale and if the C-suite can accelerate the path to market. The NxLite team started to notice this change after its seed round.

Like many founder-led companies emerging from a research-driven environment, NxLite had built a strong technical foundation. The efficacy of the startup’s nanocoating technology was well established and the scientific leadership that had developed it remained deeply committed. But as investor expectations shifted toward manufacturing, commercialization and growth, the team needed to shift its operational focus.

From the investor side, the need was straightforward: leadership that could translate a strong technical foundation into a scalable business. “David was brought in to take the company to the next level,” says Jason Blumberg, who was an early investor in the company. Bringing in a new CEO was not about replacing the founding team. It was about complementing it.

Mather saw a promising gap between NxLite’s current state and its potential. He’d seen this many times before, both as a venture capitalist and former CEO: It was a young company with strong fundamentals, but without the strategy to scale. “It looked like a house flip to me,” he explains. “A really good building, but the landscaping is horrible. If you cut the trees back, mow the lawn and put some paint on the house, it’s suddenly worth a lot more.”

Once in the role, Mather focused on understanding how investors would evaluate the company’s risk. “Venture investors don’t invest in technology,” he says. “They invest depending on the risk.”

Mather worked to identify the specific risks that would prevent NxLite from raising its next round and developed a plan to address them. Manufacturing scalability, capital efficiency and market traction became key priorities because these were the areas investors would be most interested in.

Building manufacturing credibility: For hardware and climate technology companies, fundraising becomes particularly challenging when moving from pilot to commercial deployment. Investors want to know that the technology can be produced reliably, repeatedly and at a cost that supports a viable business.

Mather strategically worked to find a way to validate scale, economics and facility requirements simultaneously. Rather than build its own facilities, which would be costly, NxLite partnered with a leading industry player with established manufacturing capabilities that were underutilized. The arrangement allowed NxLite to understand exactly what kind of facility it would eventually need — size, throughput and operational capabilities — before committing capital.

This also helped them build deeper relationships within its supply chain, creating additional strategic options as the business grew, and ultimately establishing a clear path to scaling manufacturing output. By the time NxLite actively began fundraising, there was no question about whether the company could increase production. It was a demonstrated capability.

Finding a clear go-to-market focus: For many early-stage companies, especially those with flexible technologies, go-to-market risk often stems from having too many opportunities. When startups are chasing multiple industries as potential customers, investors often view it as uncertainty — that they haven’t yet determined where it can win first.

“The hardest part is figuring out where your beachhead is,” explains Mather. “You can have a technology that applies to many customers, but you have to decide where you start — where you have the least resistance to get into the market.”

Instead of trying to sell to everyone, NxLite focused on use cases where its technology delivered immediate value. NxLite engaged customers through a mix of pilot projects, joint development agreements and letters of intent, providing early evidence of commercial interest across multiple use cases.

For investors, this shifted the conversation from theoretical market size to demonstrated demand.

During the deal

Bringing the round together: By the time NxLite formally opened its fundraising round, it was already well into the process of engaging investors. Long before a term sheet appeared, Mather had begun building relationships, testing the company’s story and gathering feedback on what potential backers would need to see before committing capital. Mather approached it as an ongoing conversation, bringing in investors to understand how his company was being perceived. Those conversations helped shape both the timing of the raise and the work NxLite prioritized in the months leading up to it.

As discussions progressed, a familiar pattern emerged. Many investors expressed interest. Far fewer, however, were ready to move forward. “You get a lot of ‘we like it, keep us posted,’” says Mather. “The challenge is figuring out who’s actually moving toward a decision.”

Rather than pushing for quick answers, Mather focused on maintaining dialogue with investors who were willing to engage substantively — those who could articulate what they needed to see next and how NxLite might get there. That clarity allowed NxLite to prioritize the work that would matter most in unlocking capital.

Over time, those signals translated into tangible progress. The company demonstrated manufacturing capability by operating in a full-scale facility, and it secured partnerships and early commercial agreements with major industry players. As the proof points accumulated, exploratory conversations evolved into more serious negotiations.

Finding alignment: “In the first round of conversations, you have all the power,” says Mather. Startup leaders are setting the narrative, deciding which conversations to advance and choosing who gets access. “But once you go back to investors with a term sheet — especially a revised one — the power is no longer in your hands,” he adds. “It’s in theirs.”

As NxLite’s round began to take shape, differences emerged around capital structure, particularly the role of debt. Some investors viewed debt as a practical tool to support capital efficiency. Others were firmly opposed, seeing it as a constraint. Once a lead investor sets terms, those differences can influence who else is willing to come in. “You’ve got to be careful how much debt you put on a business,” says Blumberg. “Too much can create problems later.” Going back to investors with updated terms can become a second negotiation.

“You really have to pay attention to what people are asking you — and what they’re not asking you,” Mather says. “The questions investors keep coming back to can tell you where the deal is going to get stuck later.” Missing those cues can make alignment harder once commitments are already on the table. In NxLite’s case, resolving the tension required diplomacy to ensure that the structure of the round matched the needs of the business.

The experience underscored a reality that isn’t always obvious at the outset: fundraising doesn’t end when a lead commits. It enters a new phase. Founders who understand how the power shifts are better positioned to navigate the moments when deals are most fragile.

Building the syndicate: Once the structure of the round was established, Maher started to build the right syndicate. “Who’s in the syndicate matters, because those are the people you’re going to be working with as the company grows,” says Blumberg.

The goal was to bring together investors with operational experience, strategic value and the capacity to support future rounds. It was about building the support system the company would rely on as it scaled. This meant walking away from capital that came with misaligned expectations — whether around aggressive use of debt or conflicting views on the company’s trajectory.

By trading speed for alignment, NxLite built a stronger syndicate and positioned the company for the execution phase ahead.

After the deal

Shifting into gear: Once the deal closed, investors were keen to see progress. Manufacturing output, customer acquisition and capital discipline became the metrics that mattered most. “The company is now funded for growth and ready to capture the massive opportunity that’s in front of them,” explains Blumberg.

The close also formalized a new set of expectations around accountability and involvement. As active board members and advisors, NxLite’s investors remain closely engaged in everything from customer introductions to operational decisions, often acting as coaches as the company scales. “We’re still an active board member supporting in the same way we did before. That doesn’t change,” Blumberg says.

For Mather, the close marked a clear transition in how the company would be judged. The story that secured the round now had to be delivered. “When you come back to the market, investors are going to look at what you said and how you performed,” Mather says. The next phase is all about gaining traction: revenue, contracts and the ability to scale.

The deal may be closed, but the next one is already taking shape. As Mather puts it: “You’re never done.”

Hear how Xatoms and Aslan Renewables closed their recent rounds at the next Technically Speaking, a special event series where experts share hard-earned lessons, on April 28. Register here.