Zenefits cofounder Parker Conrad. Zenefits Parker Conrad, cofounder and CEO of high-flying Zenefits, which has lately come under attack for missing its revenue projections and running into friction with regulatory agencies, is out, Zenefits announced on Monday.

Conrad resigned because of "inadequate" compliance measures, according to an email sent to employees by new CEO David Sacks.

"The fact is that many of our internal processes, controls, and actions around compliance have been inadequate, and some decisions have just been plain wrong," the email read in part.

Zenefits' main product is cloud-based software to manage employees, but most of it is free. It makes most of its money selling employee benefits like insurance.

It was facing scrutiny over whether it was selling insurance in some states without proper licenses, BuzzFeed reported in November.

That came just weeks after news broke that Zenefits would not meet its lofty internal target of $100 million in revenue under contract by January 31, which Conrad confirmed to Business Insider.

That huge revenue projection was one reason why VCs were tripping over themselves to invest in the company. In less than two years since its birth, it raised more than $500 million at a $4.5 billion valuation.

But at about the time talk surfaced that Zenefits wasn't hitting the revenue it promised, one of its investors, Fidelity, marked down the value of its investment in the company by nearly half. That was in September.

In the email sent to employees today, Sacks admitted that the company needed to be "properly licensed."

Sacks also took the company to task by saying that "Our culture and tone have been inappropriate for a highly regulated company."

That sounds like a remark aimed at Conrad, who was extremely outspoken. He once publicly rescinded a job offer to a prospective employee because that employee was considering multiple offers and wrote about them on Quora.

In addition to being COO, Sacks was also an investor. He is one of the most successful people in the Valley. He's a member of the PayPal "mafia," the former executives of PayPal who went on to massive success in Silicon Valley after selling the company to eBay for $1.4 billion.

Sacks also founded Yammer and sold it to Microsoft for $1.2 billion, and he was an active and a successful angel investor.

With the change in CEOs, Zenefits is also adding more VCs to its board, including Peter Thiel, cofounder of PayPal and of Founders Fund.

Antonio Gracias, founder of Valor Equity Partners, and Bill McGlashan, founder of TPG Growth, are also joining existing directors: Sacks, Zenefits' other cofounder and CTO Laks Srini, and Lars Dalgaard from Andreessen Horowitz. Dalgaard is known for founding SuccessFactors and selling it to SAP for $3.4 billion.

Here is the full email Sacks sent to Zenefits employees:

By now all of you have heard the news that Parker has resigned as CEO. I know that this will come as a shock. Parker was not only the founder of this company but also its driving force until this day.

I know it will take time for people to absorb and process this news, and it will raise many questions about the company. I believe that Zenefits has a great future ahead, but only if we do the right things. We sell insurance in a highly regulated industry. In order to do that, we must be properly licensed. For us, compliance is like oxygen. Without it, we die.

The fact is that many of our internal processes, controls, and actions around compliance have been inadequate, and some decisions have just been plain wrong.

As a result, Parker has resigned. In order for us to move forward as a company, we cannot seek to hide or downplay the problem. We must admit it and remediate it as soon as possible. In December, we hired a Big Four auditing firm to conduct an independent third-party review of our licensing procedures that we will turn over to regulators as soon as possible.

I will expand that effort into a top-to-bottom review to ensure appropriate and best-in-class corporate governance, compliance and accountability. I am also appointing Josh Stein as our Chief Compliance Officer. I know that he will bring the same rigor to this job as his did in his previous experience as a federal prosecutor. Josh is already in communication with regulators to advise and update them of our compliance issues. These steps are a start to fixing the problem, but they are not enough.

We must admit that the problem goes much deeper than just process. Our culture and tone have been inappropriate for a highly regulated company.

Zenefits' company values were forged at a time when the emphasis was on discovering a new market, and the company did that brilliantly.

Now we have moved into a new phase of delivering at scale and needing to win the trust of customers, regulators, and other stakeholders. As an entrepreneur myself, I know that Zenefits can never lose its innovativeness and willingness to experiment.

But at the same time, I believe a new set of values are necessary to take us to the next level.

Effective immediately, this company’s values are: #1 Operate with integrity. #2 Put the customer first. #3 Make this a great place to work for employees.

In order to be a great company, integrity must be at the core of what we do. We must have integrity in our business practices, compliance obligations and internal processes. We must have integrity in our product. We must have integrity in our data and infrastructure.

And we must have integrity in the way we treat each other. We must also put customer success at the heart of what we do. Everything we do should further the goal of earning and extending our customers' trust. We want customers for life, and if we can’t reasonably expect to make a customer successful, we shouldn’t sign them in the first place.

Finally, we must make this a great place to work for employees, because we're all in this together, and if we're not enjoying ourselves, what's the point? This is not to say that there won't be major challenges and tough days ahead, but that must be balanced with a feeling of fun, fellowship, and esprit-de-corps. I want all of us to feel excited to come into work every day.

We all have a role in that, but I'm going to try my best to do my part. I'm making my first actions as CEO about culture and values because I believe these things are fundamental to a company's success and who we are and want to be. I want to push down decision-making ability into the company.

Culture and values enable us to do that by ensuring that everyone is aligned around the right goals.

Once we're aligned as a team around core values, the next thing we're going to do is sharpen our strategic focus. When you raise $500 million and have a vision as big as Zenefits', it's tempting to think you can do everything at once. But no matter your size or resources, companies execute better when they ruthlessly prioritize and sequence their efforts.

For us, that means hyper-focusing on the small business market where we have product-market fit.

This is a great market for us because (1) it's huge (with many million small businesses in the US); (2) it's "greenfield" (meaning that it's under-served by technology — in fact an Excel spreadsheet is often the main competitor); and (3) the free aspect of our product is extremely compelling.

There is one other critical thing that I want to do, and that is make Zenefits a purpose-driven company. I'm glad that Zenefits is one of the fastest-growing business software companies, but that's not our mission. It alone doesn't fill my life with any meaning, and I doubt it does yours.

However, Zenefits does serve an important purpose in the world, by making the lives of small business owners so much easier. We further the dreams of anyone who wants to start a new company. We help them achieve something larger than themselves, by making it easier to hire, onboard and manage employees. By doing that, Zenefits makes entrepreneurship more accessible to everyone.

I believe this is a very powerful and real mission in the world, and personally I'm proud to be part of it. There are very few startups that ever get to this level of scale and importance.

I believe Zenefits has a great opportunity, vision, and future if we can align it to the right execution. As a friend once told me, "successful companies have multiple founding moments."

This is one of them. This is a founding moment. You are all co-founders in this new path forward. I know how much hard work everyone has put into this company and that we will all come together on this journey.

This is Day 1.

David