How to Track Pro-Rata Rights Across a Startup Portfolio

How to track pro-rata rights is a reserved-cash and deadline ledger, not a thesis that follow-ons matter. For each company, log the right, the notice window, and the cash set aside to exercise — including leftover shares that Super Pro-Rata or oversubscription can add after the first election. Raziel's guide to follow-on investments covers why you might write the check. This page is the book so a surprise round does not hit an empty checking account.

What a pro-rata right is — and what Super Pro-Rata adds

Carta's September 17, 2025 follow-on guide calls pro rata a contractual right to participate in a later round in an amount that maintains ownership percentage. It is a right, not an obligation: you still have to elect and wire.

Two documents usually create it. The NVCA Model Investors' Rights Agreement (updated October 2025), Section 4.1, is a right of first offer to each Major Investor — anyone holding at least a blank, negotiated number of Registrable Securities. The model prints no dollar default. Pro rata share is as-converted Common the Major Investor holds, including Common issuable on Preferred and other Derivative Securities, over total Common outstanding.

Y Combinator's post-money SAFE does not include pro rata. The optional Pro Rata Side Letter is the right to buy a pro rata share of Standard Preferred Stock sold in the Equity Financing: Capital Stock from conversion of that Investor's Post-Money Valuation Cap SAFEs, over Company Capitalization. The User Guide allows it only with cap-bearing SAFE forms. It terminates at the earlier of the initial Equity Financing closing, a Liquidity Event, or a Dissolution Event.

Super Pro-Rata is market slang, not an NVCA heading. It usually means a negotiated right to buy more than the maintenance amount — Carta describes concentration as investing significantly more than pro rata — or NVCA leftover rights. Log which extra you signed.

One row per company: the right, the window, the cash

One row per issuer — a SAFE side letter and a later IRA are different clocks.

• The right. Instrument (SAFE plus side letter, or preferred plus IRA). Major Investor status if the IRA applies. Current as-converted percentage. Yes/no for oversubscription or Super Pro-Rata, plus any cap. PDF link. Status: none, held, waived this round, exercised, or lapsed.

• The window. Copy the day counts from that PDF. NVCA notices may be electronic mail, given when sent during normal business hours. Stamp Offer Notice received date, election deadline, and leftover deadline if you fully exercise.

• The cash. Base reserve to maintain the percentage, and a max reserve if leftover or Super Pro-Rata can increase the check. Mark it earmarked, wired, or still spendable. Do not double-count it against a new deal.

Carta: tracking these rights across dozens of companies, each with different financing histories, is a significant operational burden. Work starts when the notice arrives.

Which notice window applies

Do not invent a generic 10- or 20-day industry standard. The signed document is the clock.

NVCA Model IRA (October 2025) Section 4.1: the Offer Notice states the company's bona fide intention to offer New Securities, the number, and the price and terms. Each Major Investor has 20 days after that notice is given to elect up to its pro rata portion. The company then promptly notifies Fully Exercising Investors of any shortfall; they have ten days to elect leftover New Securities, pro rata among themselves. Closing under 4.1(b) is the later of a bracketed 90–120 days from the Offer Notice and the initial sale of New Securities (brackets are negotiated). An optional alternative lets the company notice within 30 days after issuance; Major Investors then have 20 days to buy enough to keep the pre-issuance percentage.

The YC side letter prints no election period. The User Guide tells investors to commit or pass quickly when the company is raising the Equity Financing. YC's founder complaint is slow response, including asks after close, which the Guide calls infeasible. The form right dies at the initial closing — no leftover window unless a later IRA says otherwise. If Section 4 is waived, mark waived and release the reserve (NVCA Section 6.6).

How much cash to set aside so Super Pro-Rata is not a bounce

A right you cannot fund is a pass. Y Combinator's User Guide Appendix II works a $5 million Series A: an investor with a 10% pro rata side letter has a contractual right to invest up to $500,000. That is YC's example, not your round. Base reserve is your pro rata share of New Securities being sold, at the notice price. Until a notice exists, park a labeled estimate.

The second bucket is the surprise. If you are a Fully Exercising Investor, the extra check can arrive with ten days on the clock after the base amount is already committed. If a Super Pro-Rata letter lets you increase ownership, the max is the cap in that letter. Write it while you can still move cash. When the election becomes a wire, treat it as a cash-flow event. Raziel's capital-call tracking guide is the dated ledger for fund notices; a direct company round is the same job without an ILPA template.

A ledger is not another follow-on essay

A workbook can hold right, window, and reserve. It fails when Offer Notices, cap-table PDFs, and SAFE side letters land in three inboxes, or when leftover Super Pro-Rata arrives after the base wire has left. Carta's Deal Pro Forma can model investor pro rata on the issuer cap table. Your book still has to answer whether you will fund the line.

Raziel's startup tracker is the investment record those files should sit on: an alternative-asset dashboard for startups, real estate, crypto, and public equities, with IRR and MOIC, cap tables and valuations, AI document ingest, capital-call tracking, and wallets or bank linking. Raziel does not give legal or investment advice. When the notice hits, the useful screen already shows the window and whether the cash is there.