FounderPact

FounderPact · field instrument no. 1

The most expensive
handshake in business.

Most founding teams settle their equity split in a single sitting, long before they know what they’re splitting. Here, you get to live with yours first. Build the split. Sign the agreement. Then run thirty-six months of your company’s life and meet your fate.

Build your split Read the evidence first ↓

an educational instrument, not legal advice · every run is different · no two fates are the same

Exhibit A · The evidence

Decided in a day.
Regretted for a decade.

35%
of founding teams split exactly equally, in a study of 1,476 founders across 511 ventures
42%
negotiate the whole split in one day or less. Two thirds settle it at the very outset
−9.8pts
equal-split teams were 9.8 points less likely to raise venture capital: a 22% relative drop against the 43.9% baseline

In Hellmann and Wasserman’s study (HBS, published in Management Science), the quick, equal handshake also came with lower first-round valuations and roughly a fifth fewer employees. But read the fine print the way the authors wrote it: this is correlation, not sentence. A fast 50/50 doesn’t doom a company; it’s what conflict-avoidant teams tend to reach for. The handshake isn’t the disease. It’s the symptom. This instrument exists to make you have the conversation, not to ban equal splits. In fact, Carta’s 2025 data shows deliberate equal splits are rising, and the median founding team holds about 56% of the company at seed and 36% by Series A.

the 2011 working paper priced the equity a stronger founder forgoes by defaulting to equal at roughly $450K in net present value. Later revisions dropped the estimate. The conversation stayed expensive.

The graveyard

No. i.Eduardo Saverin · Facebook30% on paper, then diluted to near nothing while his cofounders’ shares were protected. It took a lawsuit to claw a stake back.as reported; litigation settled under sealdiluted
No. ii.Reggie Brown · SnapchatNamed the app, invented the disappearing-message idea, got pushed out with nothing in writing. Settled years later for a reported $157.5M, a fraction of the third he’d claimed.settlement amount disclosed in Snap’s 2017 IPO filingerased
No. iii.Robin Chase · ZipcarSplit 50/50 in a single sitting to feel fair and fast, before anyone knew who would actually build the company. The split never moved; the resentment did. Chase has called it a defining early mistake.source: The Founder’s Dilemmas, via Startup Lessons Learnedregretted
No. iv.Whitney Wolfe Herd · TinderCofounder title and stake contested after the relationship inside the company soured. Left, sued, settled, and built Bumble into the counterargument.as reported; settlement terms undisclosedcontested
No. v.Garry Tan · PosterousA top-200 website, later acquired by Twitter. Tan resigned when cofounder conflict became physically unbearable. The company didn’t fail; the founding relationship did. His own postmortem names the mechanism: the conversation nobody scheduled.source: first-person postmortemwalked away

this page was adversarially fact-checked against primary sources: Hellmann & Wasserman (HBS, NBER, Management Science), Carta founder-ownership data, and first-person accounts. Where the record is press-only, entries say “reported.”

Exhibit B · Your split

What did each of you
actually bring?

Not who you like more. Not who asked first. Cash, time, forgone salary, the idea, prior work, and how hard each of you is to replace. Adjust the weights if you disagree with the defaults; the math stays visible either way.

The math, visible

share = normalize( commitment × (base + forgone salary) + cash×2.0 + prior work + scarcity ) then the idea founder takes +10% before renormalizing.

Exhibit C · The agreement

What goes in writing?

These five clauses decide how your story ends more than the numbers do. Toggle them honestly: only count what you would actually sign before the run begins.

Sign it. Begin the run. thirty-six months · about ninety seconds · skippable
Exhibit D · The run

Thirty-six months.
Your split rides along.

The ink is dry. The company clock starts the moment you press begin. Who takes the call in month eight, who carries year two, how the raise lands: every run rolls differently. Your agreement is the only thing that doesn’t change.

A split is a snapshot.
The pact is the movie.

Every fate above turned on a conversation that either happened early or happened in court. What each of you expects, fears, and needs, said out loud before it’s expensive: that’s the other instrument.

Begin a pact or run the 60-second rehearsal →