Almost every pre-IPO marketplace lists the same 25–40 headline private companies. In a private market marketplace, SpaceX, OpenAI, Stripe, Databricks — they're all there. If you're still building foundational context on how pre-IPO investing ecosystems and secondary supply dynamics work, review the complete guide to pre-IPO investing before evaluating listed availability versus actual execution. The catalogs look identical at the URL level. The actual supply behind those listings is not — genuine depth in names like Epic Games pre-IPO shares is far rarer than the catalogs suggest.

The question buyers should ask is the one that gets the least coverage in marketing copy: at this exact moment, is there a confirmed seller for this name and size? If the answer is yes, you have a real trade waiting for paperwork. If the answer is 'we'll source one,' you have a four-to-eight-week shopping process the platform will charge you for whether it succeeds or not.

Question 1 — Is supply confirmed at the moment of indication, or sourced after?

This is the cleanest way to separate venues. Some platforms (us included) only list issuers where confirmed seller-side supply is in the book right now. The desk knows the seller's price floor, the share class on offer, and the size available. Indications match against existing inventory; the trade either clears or it doesn't, but it doesn't drag.

Other platforms run more like a request-for-quote. The catalog is aspirational. When you indicate, the platform begins a sourcing process — calling sellers in their network, posting to internal channels, sometimes reaching out to companies' equity admin teams. The lag this creates is real. We've seen 6-week sourcing windows on names other platforms list as 'available.'

Neither model is bad in principle. But buyers should know which one they're using before they wire anything. Ask: What does it mean when a name appears in your marketplace? Is supply confirmed today, or is it sourced after I indicate?

Question 2 — How is supply refreshed?

Stale supply books are how 'available' becomes 'oh, that filled last week.' The right cadence depends on the platform's sourcing model, but the answer should never be 'whenever the desk gets to it.' We refresh hourly because seller intentions change fast — a tender announcement, a 409A reset, a personal liquidity event can move a seller's posture in a day.

Look for two signals. First, the timestamp on the marketplace UI itself: does the platform show when each indication was last verified? Second, look at how the platform handles fills: when a seller commits, does the listing update within minutes, or does it sit visible for hours?

Question 3 — How wide is the buyer book?

Counterintuitively, supply depth correlates with buyer depth. Platforms with broad and active accredited buyer-side coverage attract more sellers, because sellers want price competition. A platform with a narrow buyer book ends up offering sellers a single offer at a time, and most of them walk.

You can ask a platform two questions to get at this. How many accredited buyers transacted in the last 90 days? and How many of your listings have multiple bidders at any given time? Reluctance to answer either is a signal.

Question 4 — What's the fall-through rate?

Not every confirmed indication settles. ROFR can pull rank. Sellers can change their minds. Issuer transfer policies can block specific buyers. The fall-through rate — the percentage of accepted indications that never become settled positions — is the single best indicator of whether a platform's supply book is real or theoretical.

Healthy fall-through across the industry runs 5–15% depending on the issuer mix. Anything above 25% suggests the platform is taking indications it can't actually fill. The number is rarely published; ask your relationship manager directly.

If a platform won't tell you their fall-through rate or last-90-day transaction count, you're being asked to take supply on faith. The right venues will share both.

What 'confirmed' means at Limen Markets Private

Every name on /marketplace is backed by named seller-side supply at the moment you view it. The desk runs a real-time book — when a seller commits, listings update within the hour. We share fall-through rates and recent transaction volumes with serious buyers on request. If the answer to any of the four questions above is uncomfortable for a venue you're considering, you have a useful data point about whether their supply is what they say it is. For the bigger picture on supply and demand in the pre-IPO market, read our 2026 market map.

Where to start

  • See live confirmed supply at /marketplace.
  • Read the broader marketplace comparison at /resources/top-pre-ipo-marketplaces.
  • Specific name questions go through the desk via the chat assistant on every page.