I’ve Spent 16 Years Unwinding Business Partnerships—Here’s the One Rule That Actually Works

My name is Richard Cohen. I’ve spent sixteen years moving between Wall Street and Silicon Valley, doing investment banking and corporate restructuring. I’ve watched companies grow from two desks in a garage into unicorns, and I’ve watched partners go from sharing a pizza to filing restraining orders against each other. So many founders who once slept on the same floor and cursed the same investors never ended up hugging at the IPO bell. Instead, they passed each other in the courthouse hallway, refusing to make eye contact.

Why? Because most people, from day one, hear the word “partnership” and mistake it for something else entirely.

I. The essence of a business relationship is value exchange, not emotion.

Years ago, I mentored a young man named Alex Turner. I spotted his résumé in a stack of forty almost immediately: sharp, hungry, unafraid of a hundred-hour week. Over five years, he rose from analyst to director, and nearly every M&A model he built had my redlines on it from three in the morning. I gave him the best deals, the most critical introductions. When he fumbled his first big client presentation, I stepped in and took the hit.

Then, over the strategic direction of a cross-border transaction, we fell out completely. He left, took two key clients with him, and opened a boutique advisory firm right across the street. From that day on, we never spoke again.

I won’t lie: those first two years were brutal. Not financially. Some mornings, when I’d pull up the Bloomberg terminal and see his firm had closed another deal, I’d find myself gripping my coffee cup too tight. At industry cocktail events, if I spotted him across the room, I’d turn around and refill my soda water. For a long time, I called it “betrayal,” and I punished myself with that word.

Then one afternoon, cleaning out old files, I came across a piece of sector research he’d written three years earlier. The data framework, the logic threads: I had used that very structure in four successful client pitches. I stared at his name on the cover page and suddenly understood: while I was teaching him, he was feeding this firm. For five years, he gave us his best execution, his grit, and a kind of energy that made younger teams run through walls for him. What I gave him was a platform, frameworks, room to fail.

It was a value exchange. The cycle simply ran its course when our learning curves and personal trajectories no longer aligned.

In business, nobody owes anybody anything. The deepest form of adult maturity is to stop applying emotional logic to value-based relationships, and then blaming the other person for “ingratitude.”

II. Most partners fall out not because they are bad people, but because the structure was wrong from day one.

People love to reduce startup failure to “human greed.” That’s too lazy. I’ve been brought in to unwind at least eleven partnership disputes, and the real problem is almost always bolted into place the moment the incorporation papers are signed.

Three years ago, I handled the separation of a consumer-tech startup called Brooklyn Lab. The founders were three college roommates: Tommy, Rachel, and Ben. They wrote their first line of code in a Brooklyn loft and split the equity out of pure loyalty: 33.3% each, and when the math wouldn’t divide evenly, 33:33:34, because anything else felt unfair and they didn’t want to hurt the friendship.

By the time the company hit its Series C, a strategic Asian investment came in that required adjusting the board composition. Tommy wanted to take the term sheet. Rachel worried about control dilution and wanted to vote no. Both of them turned to Ben, and that leftover 1% difference suddenly became a nuclear trigger. During that period, Ben was under so much pressure that he’d sit by himself in the fire stairwell for long stretches. At the final partners’ meeting, Rachel set her coffee mug down hard on the table. “You’ve forgotten what we agreed,” she said. “Any major decision requires all three of us.” Ben didn’t look at her. He said quietly, “But the company isn’t just the three of us anymore.”

When the movers later carried out that corkboard from the loft, the one covered in photos of the three of them eating hot dogs at Coney Island, grinning, and beneath it, scattered on the floor, lay pages of amended risk clauses, I saw an image I have never been able to shake.

They weren’t bad people. They had simply forced a living organism that requires a single decision-maker into a static, emotion-based structure. A company can only have one person who makes the final call. When a major disagreement hits, equal equity doesn’t produce consensus; it produces deadlock. And startups are dynamic: in year one, the person who puts up capital matters most; in year three, it’s the one who can land clients; in year five, it’s the one who can raise the next round. But equity is locked on day one. When the gap between contribution and reward grows wide, the people doing the real work start glancing at their cap table every morning like it’s a personal insult. By then, the conflict is a matter of physics, not morality.

The scariest moment is when one person tries to solve it with governance and the other appeals to sentiment. “Back when we used to split a donut on this table, why didn’t you bring up voting rights then?” The moment that sentence leaves someone’s mouth, the company is no longer a company. The moment an organization places “how we were” above “how we rule,” collapse is just a matter of time.

III. Many partner fallouts are, at bottom, a form of corporate metabolism.

That sounds cold, but not as cold as reality. A business is a living thing. It needs different organs at different stages. The people who can fight the wilderness with you are not necessarily the people who can govern the kingdom.

No student of Western business history can avoid that famous case: in 2004, an undergraduate at Harvard built the prototype of a social network in his dorm room. His best friend, the one who bought the servers, flew in from New York to handle the finances. Later, the company moved to Palo Alto, took accelerator funding, and restructured. One day, that friend sat in the new office, looked at the revised contract, and realized his stake had been diluted to near zero. He threw a chair and shouted at the founder, “We came from the same dorm!” The founder leaned against the window and said, “Eduardo, the company needs people who can carry it into the next phase.” They settled out of court eventually, but the friendship was gone forever.

You can criticize the tactics, but you can’t stop the pattern. When a company moves from tens of millions toward hundreds of millions, the organization demands a different density of capability: narrative for fundraising, strategic stamina, management at scale. If an original partner can’t keep pace with that metabolism, and also won’t relinquish decision-making authority, the conflict won’t ask if it’s coming. It will only ask which boardroom door it explodes through.

People don’t turn bad. The company just needs to survive. An organization doesn’t owe loyalty to any individual’s nostalgia; it owes loyalty to the ongoing creation of value.

IV. If you’re building a company as an adult, don’t test human nature. Lock in the rules.

This is the sentence I paid over a decade of restructuring work to earn: never gamble morality against commercial interest. When the relationship is at its best, write the worst-case scenario into the contract.

When Sophia Chen founded her health-tech company Soma, she did something that made her co-founder uncomfortable: on the night they celebrated closing their angel round, she pulled out a forty-page shareholder agreement. Vesting schedules. Buyback clauses. Non-competes. Even a specific exit process if a partner had to leave for health or personal reasons. Her technical co-founder, Benjamin, joked, “We haven’t even started making money, and you’re already drafting divorce papers?” Sophia didn’t laugh. She slid the pen across the table. “That’s exactly why we can write it now, because we’re at our best.”

In year five, Benjamin decided to go travel the world. Per the agreement, his unvested shares were bought back by the company at the agreed price. The handover took less than a week. On his last day, Benjamin hugged Sophia at the office door and said, “Thank you for making me sign those things.” There was no suspicion. No haggling. Not even an awkward farewell dinner.

Meanwhile, one street over, a green-tech startup called Greenline was founded by two women who had grown up together. No exit clauses, no buyout mechanism. When one of them had to leave suddenly due to a family crisis, the other couldn’t stomach suddenly having to produce a large sum of cash to buy back the shares. They went from exchanging long, emotional messages late at night to sitting in a lawyer’s mediation room, and finally, on the courthouse steps, one of them screamed at the other’s back, “You’ve forgotten who took care of your mother when she was sick!” No legal document on earth can catch a sentence like that.

The clearer the rules, the longer the partnership lasts. People think talking about this stuff early “hurts the relationship.” The opposite is true. Avoiding the rules is what ultimately destroys the relationship.

That evening, I finished a liquidation memo on a partnership dispute and closed my laptop. A financial news alert flashed on the screen: Alex Turner’s firm had just completed a new funding round. I watched it for a few seconds, then closed the tab and pulled open my desk drawer. Inside was a photo of the two of us at a Manhattan Yacht Club dinner five years earlier. We were both holding tumblers of whiskey, smiling faintly. I turned the photo face down, picked up my jacket, and walked out to meet the next founder who needed me to help take a partnership apart.

In business, there are no permanent friends and no permanent enemies. Most partners are simply people who walk a stretch of the road with you. If you can part ways gracefully at the top, that’s luck. If in the end it has to get ugly, then that, too, is just a cell division that the organism had to go through.

Most of the time, a relationship between two people is destroyed by mismatched business cycles, shifting interests, and misaligned organizational stages, not by malice. In the adult world, spare me the emotional narrative. Give me structural understanding. Structure, always and only, lives in black and white.