About a hundred people joined Stash over one weekend, all apparently from the same place. For a young investing business, this was the sort of popularity that could spoil Monday morning. David Ronick and his colleagues worried about fraud. When they called the new customers, they discovered sailors on a submarine. The men wanted to invest. Other institutions’ minimums had kept them out. Stash would let them begin with $5.
Ronick has recounted that episode as a correction to the founders’ assumptions. They had pictured young customers heading towards large salaries. Here were people already working hard, with money to put aside and a quite practical objection to being refused entry. Teachers, military families and retail workers became central to the company’s thinking. Pricing and marketing changed accordingly.
It is an appealing entrance to Ronick’s career: a businessman receiving useful instruction from people he had briefly mistaken for a problem. There are less expensive ways to learn humility than founding a company, although few supply such memorable homework.
A whiteboard, a beer, and a smaller first step
Ronick co-founded Stash with Brandon Krieg and Ed Robinson in 2015 and served as its initial CEO. His contribution came from building consumer businesses; Krieg and Robinson brought Wall Street experience. Asking younger relatives about investing produced an unflattering assessment of the existing experience: expensive, intimidating and difficult to understand.
The early idea took shape over beers at a whiteboard at Techstars. The company was founded in February, and its iPhone app arrived in October. Within five weeks, more than 20,000 investors had signed up. The response suggested that the invitation had reached people.
The first product offered a curated selection of 30 exchange-traded funds. Fractional ownership lowered the starting amount, while familiar themes made browsing less forbidding. The design treated vocabulary as part of the experience. Financial language can make a perfectly ordinary decision feel like an examination for which everyone else has revised.
“We try to guide you to build good investing habits,” Ronick said at the time. The emphasis was on holding investments over time and avoiding daily market distractions. The app’s small entrance fee, in the broader sense of effort and money required, was the point. Beginning had to feel possible.
An English degree meets the spreadsheet
Ronick graduated from Brown in 1989 with a degree in English and History, then earned his Harvard MBA in 1994. His public career record includes running Fresh Space Media, serving as COO of Moby Entertainment and later working as COO at Move Collective. Consumer products, media and operations preceded the investing app. Finance was one chapter in a career already accustomed to changing its surroundings.
The combination of humanities and business is useful to keep in mind when reading his advice. He likes an idea that can be explained, and he wants the arithmetic behind it. A promising sentence and a plausible revenue model must eventually learn to occupy the same room.
In his 2011 essay on business planning, he recalled a client he called Lenny, who arrived with a spiral-bound, 40-page plan. Four months of work had produced a document the founder struggled to explain aloud. Ronick also described a newsletter entrepreneur who had spent heavily on a website before answering basic questions about subscribers and advertising.
Both stories reveal his impatience with ceremonial preparation. One founder had too much paper; another had too little commercial clarity. The relevant task was to understand the business and communicate it. A document can look reassuringly finished while the thinking inside remains in its dressing gown.
The advice came before the app
Long before Stash, Ronick was helping other founders navigate those questions. He met Amanda Steinberg in July 2008, when DailyWorth, her personal-finance newsletter for women, was still an idea. He began coaching her shortly afterwards; she launched in January 2009. By June 2011, the newsletter had passed 100,000 subscriptions.
His account of working with Steinberg dwelt on the business beneath the publication: what it cost to attract readers, what advertisers would pay, and which experienced newsletter operators might help. It is a concrete example of mentoring as practical work. Encouragement is pleasant. Knowing which question to ask about customer acquisition can be considerably more useful.
That same year, writing about judging Harvard’s business-plan competition, Ronick praised teams who had actually spoken with customers. He wanted evidence of demand, a clear explanation and some feeling for the people being served. He also warned against slides drowning in text. A room full of business-school judges, apparently, could be lost to an excess of business-school presentation.
In a separate essay about learning from experienced operators, he encouraged founders to seek out investors, former employees of competitors and businesses serving other markets. His version of entrepreneurship has room for borrowed experience. Starting a company need not require pretending nobody has ever started one before.
“Timing is everything.”
David Ronick, on an early venture that arrived too soon
Give saving a reason to be opened
After Stash came another question about money: how might people enjoy putting it away? Ronick began developing WinWin in 2017. When the savings app launched in February 2018, it used cash prizes and games to give customers an immediate reason to return.
The launch version centred on a weekly $1,000 prize. Each dollar saved counted as an entry, and daily games offered further rewards. There were 20,000 names on the waitlist, and the business had raised $1.5 million in seed funding. These were figures for that launch, rather than a description of a product available today.
The premise gave the patient virtue of saving a little theatrical assistance. People were already willing to spend attention on mobile games and the prospect of winning. Ronick wanted to put some of that appetite to work for their savings. Respectable financial behaviour, in this telling, could benefit from being less dull.
A Financial Solutions Lab profile traced his interest to reading about prize-linked savings. The idea joined two different timescales: the immediate pleasure of a possible reward and the slower satisfaction of accumulating money. It also exposed a recurring concern in his work. A product has to accommodate what people actually do, including the habits that make a tidy plan inconvenient.
The notebook has competition
By February 2025, Ronick had opened another line of inquiry: how founders could use AI tools. His newsletter, 10Xing, began with a candid admission that the abundance of tools could feel overwhelming. He presented himself as a nontechnical founder learning alongside his readers.
There was substantial experience behind that beginner’s posture. In the introduction, he described advising more than 1,000 founders, investing in more than 40 startups and becoming a limited partner in Everywhere Ventures. Those are his own reported counts, dated to that introduction. He also acknowledged companies that had failed, including a social-network idea that arrived years too early.
He described travelling between New York and the east end of Long Island, where he had moved with his wife, two sons and their sheepadoodle. It is a domestic detail that sits agreeably beside the venture vocabulary. However ambitious the experiment, someone still has a dog.
The newsletter became specific quickly. In a March 2025 piece on meeting notes, Ronick remembered carrying a Moleskine and the difficulty of listening properly while writing things down. He had tried Otter and later switched to Granola. His account paid attention to small social frictions, such as a recording bot appearing in a meeting before its human owner. Even automation, it seems, needs manners.
Still willing to revise the plan
His March 2025 essay on finding startup ideas argues for treating an idea as a sequence of experiments. It asks founders to understand customers early, consider what has changed to make an opportunity possible, and keep their assumptions easy to revise. He shared an early Stash planning canvas as an example of thinking that had changed.
That is a useful connection across the years. His 2011 road map for starting a business had already urged readers to get feedback, build a basic offering and adjust after customers tried it. New tools can shorten parts of that process. The obligation to find something people want survives every improvement to the software.
Stash has continued its own journey. On February 12, 2026, Grab announced an agreement to acquire the company, with an initial transaction enterprise value of $425 million. The announcement described more than $5 billion in assets under management and over a million paying subscribers. Krieg and Robinson were leading the business as co-CEOs. Ronick’s role belongs to its founding history.
His public LinkedIn profile now lists a stealth startup. Alongside it sit the mentoring, investing and writing: ways to stay close to the awkward early questions. The submarine episode remains an apt introduction. An unexpected group of customers appeared, the founders called them, and the explanation changed the business. For all the machinery available to a founder, there is still considerable value in picking up the phone.