QSBS (Qualified Small Business Stock) is an IRS provision under Section 1202 that excludes up to $10M-$15M (or 10x basis) in capital gains from federal tax. The One Big Beautiful Bill Act (signed July 4, 2025) created a two-regime structure: stock issued on or before July 4, 2025 follows the pre-OBBBA rules ($10M or 10x cost basis cap, $50M gross-assets ceiling, 5-year hold for the full exclusion); stock issued after July 4, 2025 follows the OBBBA rules ($15M cap inflation-adjusted after 2026, $75M gross-assets ceiling, tiered holding with 50% exclusion at 3 years, 75% at 4 years, 100% at 5 years, maximum exclusion up to $750 million). The exclusion is available to founders, early employees, and early investors. It is one of the most v...
The people side of building a company. This cluster covers founder roles and dynamics, the executive lineup, the hiring sequence, sales and customer success roles, compensation and equity, performance management, layoffs and severance, and the culture and operations that determine whether the team holds together. 63 entries.
If your business succeeds or fails on hiring (most do), this is the cluster you live in.
Everything about raising capital, from the first SAFE to the IPO. This cluster covers every named stage (pre-seed through Series E+), the investor types (VC, CVC, angels, family offices, crossover funds, strategic vs financial), the fund mechanics that drive investor behavior (LPs, GPs, fund life, carried interest), the crowdfunding regulations and platforms, the round structures (up, down, flat, bridge, extension), and the closing mechanics that make deals real. 97 entries.
This is the most thoroughly covered cluster in the lexicon because fundraising decisions compound for years.
A prototype is a working or simulated representation of a product used to test concepts, flows, interactions, or feasibility before committing to full development. It ranges in fidelity from paper sketches to clickable mockups to fully functional code, and should be chosen at the lowest fidelity that can answer the question being asked. It is the cheapest tool in the product discovery toolbox, and the one most consistently underused by founders who jump straight to building.
The fidelity ladder runs from low to high: paper sketches (cheapest, fastest, useful for concept testing and flow validation), wireframes (digital low-fidelity layouts, Balsamiq-style or in Figma), clickable mockups (interactive Figma / Sketch prototypes that ...
A startup is a young company built to find and scale a repeatable, high-growth business model under conditions of high uncertainty. It is distinguished from a traditional small business by its pursuit of rapid growth rather than steady-state operation, defined by what it is searching for (a working, scalable model) rather than by its age, size, or industry.
The two most-cited definitions come from the founders of the modern startup playbook. Steve Blank: "A startup is a temporary organization designed to search for a repeatable and scalable business model." Paul Graham of Y Combinator: "A startup is a company designed to grow fast." Both definitions point to the same idea, that the defining feature of a startup is the search for and...
Cash flow is the net movement of cash into and out of the business over a defined period, categorized into operating, investing, and financing activities. Operating cash flow comes from running the business (customer payments minus operating expenses), investing cash flow tracks long-term asset purchases or sales, and financing cash flow captures debt and equity raised or repaid. Cash flow (not revenue or accounting profit) is the metric that actually determines whether a startup survives, because companies fail when they run out of cash regardless of what their P&L shows. It is the most operationally critical metric at most startups and the one founders most often misunderstand.
The three categories of cash flow:
Operating cash f...
Generative AI is the category of AI systems that create new content (text, images, code, audio, video, 3D) rather than classifying or analyzing existing data. The November 2022 release of ChatGPT marked the cultural and commercial inflection point that transformed generative AI from research curiosity to mainstream technology used by hundreds of millions of people within months. It's the category of AI that produces output rather than just labels or predictions.
The pre-ChatGPT history (compressed):
2014: Generative Adversarial Networks (GANs) introduced. First major generative image breakthrough.
2017: Google's "Attention is All You Need" paper introduces the Transformer architecture (the foundation for modern LLMs).
2018: Op...
An AI moat is the defensible advantage an AI startup builds to prevent commoditization by competitors. Five real moats exist in the AI era: data flywheel, workflow integration, distribution, brand and trust, and network effects. Raw access to foundation models is NOT a moat because everyone has the same APIs, making moat-building one of the most strategically important questions for any AI founder. It's the answer to "why can't anyone else build this?"
The five real AI moats:
1. Data flywheel ([Data Flywheel]):
An AI startup is a company whose product depends on artificial intelligence or machine learning as a core differentiator. The category breaks into three distinct archetypes: foundation model labs (OpenAI, Anthropic, Google DeepMind, Meta AI training the largest models), AI infrastructure (Hugging Face, LangChain, Pinecone, Weights & Biases providing tooling), and AI application companies (Cursor, Perplexity, Harvey, Glean building products on top of foundation models). Each archetype has fundamentally different economics, capital requirements, and defensibility characteristics. Understanding which category your AI startup falls into is the first step in evaluating its moat.
The three categories:
Foundation model labs:
A balance sheet is the financial statement showing a company's assets, liabilities, and stockholders' equity at a specific point in time. Unlike the P&L and cash flow statements that cover a period, the balance sheet is a snapshot, and the fundamental equation Assets = Liabilities + Equity always holds (hence "balance"). It is one of the three core financial statements (P&L, balance sheet, cash flow) that together provide a complete view of financial position. Balance sheets are more important at later-stage and public companies than at early-stage startups, where most items are minimal and cash is the only meaningful asset.
The standard balance sheet structure:
Assets (what the company owns):
Current Assets (convertible to ca...