Asking whether a tunnelling company is really worth $23 billion is the obvious move and a waste of effort: no revenue, no margin and no current-year ride count has ever been published, so nobody outside the company can answer it.
A narrower question can be, because this company is unusual: it publishes its own construction costs. Does $3 billion cover what the announcement says the $3 billion is for?
On 9 September The Boring Company announced a $3 billion Series D, saying the financing "now values The Boring Company at $23 billion", four times the $5.7 billion mark set by a $675 million round in 2022. The United Arab Emirates and affiliated investment entities led it, and the announcement pairs the money with a partnership to deploy "150+ kilometers of tunnel" across the UAE.
Nobody quoting a percentage knows which one they mean
The page never says whether $23 billion is before or after the money, and that omission decides what was sold. Read post-money, the usual construction for "now values" after announcing a round, and $3bn / $23bn is 13.04%. Read pre-money and the denominator becomes $23bn + $3bn = $26bn, so the same cheque buys $3bn / $26bn, or 11.54%.
Those 1.5 percentage points are worth about $346 million against a $23 billion mark. Every write-up quoting a stake has silently picked one, and no filing settles it.
Fourteen stations are carrying passengers; 123 are approved
The denominator has to come from the company's own claims, because they are all there is. Vegas Loop has "carried more than four million passengers", a cumulative total running since the first system opened in April 2021 rather than an annual rate, and those passengers moved through 14 stations. Clark County and the City of Las Vegas have approved 68 miles of tunnel and 123 stations.
The Boring Company's own announcement and project pages, read 10 September 2026
| Project | Operating today | Announced |
|---|---|---|
| Vegas Loop stations | 14 | 123 approved |
| Vegas Loop tunnel | 14th under way | 68 miles approved |
| Dubai Loop pilot | None | 6.4 km, 4 stations |
| Dubai Loop, full route | None | 22.5 km, 19 stations |
| Wider UAE partnership | None | 150+ km target |
| Music City Loop | 2 machines mining | ~25 miles |
Operating counts are the company's own descriptions as published: 14 stations carrying passengers in Las Vegas, the 14th Las Vegas tunnel recently begun, two Prufrock machines mining in Nashville with a third in assembly. Dubai Loop is under contract with construction planned to begin in late 2026, so nothing there operates yet. The announced column mixes categories deliberately: the 68 miles and 123 stations are entitlements granted by Clark County and the City of Las Vegas, the Dubai figures are contracted and estimated phases, the 150+ km is a partnership target in the funding announcement rather than awarded work, and the Nashville distance is the span the company describes for the planned system.
Set the mark against the traffic: $23,000M / 4 million passengers is $5,750 for every passenger the system has ever carried. Treat that as a ratio for showing scale, not a multiple anyone values the company on, because there is no revenue line to build a multiple from. What it measures is the distance between what operates and what is being priced.
Two published cost figures, and they agree with each other
Three construction costs sit on its own pages.
The original Las Vegas Convention Center Loop, 1.7 miles of tunnel and three stations, "cost approximately $47 million (firm-fixed price)". That system is built and operating, which makes its rate the only one proven by completion: $47M over 1.7 miles (2.74 km) is $17.2M per kilometre.
The Dubai Loop agreement with the Roads and Transport Authority puts the 6.4-kilometre, four-station pilot at "approximately USD 154 million" and the full 22.5-kilometre, 19-station route at "approximately USD 545 million". Divide each: $154M / 6.4 km is $24.1M per kilometre, and $545M / 22.5 km is $24.2M per kilometre. Two separately estimated projects landing within 0.7% of each other is what a real cost basis looks like.
Now run the target out. 150 km × $24.1M is $3.61 billion, or 120% of the money just raised. At the cheaper Las Vegas rate, 150 km × $17.2M is $2.58 billion, still 86% of it. And the same $3 billion is also earmarked for Las Vegas, Nashville, Prufrock R&D and "significantly increase[d] hiring". Las Vegas alone carries 68 approved miles, or 109.4 km, which at the Dubai rate is another $2.63 billion; the two programmes together come to $6.2 billion, 2.1 times the round.
None of that makes the round too small. Tunnels get built out of revenue, later rounds and project finance, not from a single cheque. It does mean the 150-kilometre figure is a partnership target attached to an announcement rather than work in hand, and that at the company's own prices, the headline number and the headline commitment are the same size.
There is no filing behind any of this
Searched today, the SEC's database holds no company matching The Boring Company and its full-text search returns no hits. Every figure above is the company describing itself on its own website, and the wire coverage sits downstream of that page.
That is not an accusation, and it may change. An offering sold under Regulation D owes a Form D within 15 days of the first sale, so one could appear shortly; other exemptions owe nothing at all.
What would change the picture
A Form D would settle the amount actually sold. A pre- or post-money statement would settle the stake. A current-year passenger figure, rather than a total accumulating since 2021, would turn the operating business from an anecdote into a rate, and the published fares of $5 on the Strip and $14 from the airport would then mean something. None of the four exists today.
A company can be worth $23 billion on things it has not built yet; that is what venture marks are for. The narrower point is that the page gives no way to check which of them the money reaches.
The round size, valuation, investor list, use of proceeds, the "150+ kilometers" UAE figure, the four-million passenger total, the station and tunnel counts and the Nashville milestones all come from The Boring Company's own announcement of 9 September 2026 and its project pages, read 10 September 2026. The $47 million Convention Center Loop cost and the April 2021 opening are from the company's page for that system; the $154 million pilot and $545 million full-route Dubai figures are attributed there to its agreement with Dubai's Roads and Transport Authority. The 2022 round of $675 million at $5.7 billion is press-reported, not filed. Costs per kilometre, the percentages each reading implies, the per-passenger ratio and every extrapolation across a target distance are ours; they assume a rate quoted for one city holds in another, and each published cost covers a whole system including stations. The absence of any SEC record was checked on 10 September 2026.