The Boring Company Completes $3 Billion Series D Round, Post-Money Valuation at $23 Billion
Elon Musk's tunnel company The Boring Company has completed a $3 billion Series D round, with a post-money valuation of $23 billion, led by entities from the UAE and related investors. The funds will be used for expanding engineering, operations, and production, advancing the Loop projects in Las Vegas, Nashville, and Dubai, and continuing the development of the Prufrock tunneling machine. The company also plans to lay over 150 kilometers of tunnels in the UAE, independent of the previously awarded Dubai Loop.
Co-investors include Human Capital, Vy Capital, Valor Equity Partners, Sequoia Capital, Andreessen Horowitz, Temasek, Shamal Holding, and Baron Capital. The valuation in the 2022 Series C round was approximately $5.7 billion, making this round about four times that. The Wall Street Journal reported in July that the company was seeking up to $4 billion. Baris Akis, co-founder of Human Capital, stated he is one of the main investors in this round and has assisted the company in hiring for five years.
Las Vegas remains the only scaled passenger system. The Vegas Loop has transported over 4 million passengers, with Clark County approving 123 stations (including 19 recently approved). The company claims to be digging the 14th tunnel in the city, the 25th globally. The Nashville Music City Loop is currently being excavated with dual machines in limestone, with a third being assembled in Texas. The Dubai Loop was previously agreed to be about 14 miles, with the first phase reported at 17 kilometers, accommodating up to about 20,000 passengers per hour; the UAE side's passenger tunnel has yet to open, but production of precast components has begun.
The new version of Prufrock can be launched and recovered from a platform called The Monster, eliminating traditional launch shafts and cranes, and advancing unmanned excavation and automated segment assembly monitored in Texas. The headquarters is in Bastrop, Texas. PitchBook and others indicate the company has about several hundred employees, with total funding rising to approximately $3.9 billion following this round. Musk has stated the goal as "to defeat congestion."
Akis has also invited engineers and operations personnel to fully funded visits to the Vegas Loop on October 18, with no limits on years of experience; recent graduates and dropouts can apply, with a deadline of October 1. He stated the aim is to use this round to expand the Loop to more cities in the U.S. and abroad, targeting "the next 100 cities." This is a hiring move following the funding, not a signed list of 100 cities.
In market mechanisms, this represents sovereign capital and Silicon Valley funds pricing for networks that have not yet been scaled. The buyers are the UAE (which is providing funding and requires over 150 kilometers of tunnels) and funds that have long bet on Musk's system; the seller is Boring, packaging the Vegas passenger record and overseas contracts for sale. The funds will flow towards tunneling machines, precast segments, and multiple city projects, rather than an already profitable ticketing network. Beneficiaries are companies that can write orders as valuation multiples and infrastructure projects in the leading country; those under pressure are surface transportation and the delivery pace that has yet to prove unit costs can be replicated in hard rock and international sites. The event is driven by the Series D closing.
On a supplementary level, early-stage costs in Dubai had previously shown about $154 million for the first phase and about $545 million for the entire network, which is not the same work order as the new commitment of 150 kilometers. The valuation is primarily marked in advance on unexcavated sections.
Source: Public Information
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Boring was spun off from SpaceX with the promise of "eliminating surface congestion with tunnels." Nine years later, the operational assets that can be included in the roadshow still mainly consist of the Loop connecting casinos and conventions in Las Vegas, with passenger numbers exceeding four million and 123 stations approved. The $23 billion valuation leverages the short tunnels proven in Las Vegas, along with the Nashville hard rock and the UAE's 150-kilometer order. The leading country is also the largest pending customer, with checks and work orders tied together, similar to project financing where resource countries prepay for capacity, rather than purely financial rounds.
The capital path is "sovereign orders determining valuation, with Silicon Valley funds following scale." The $3 billion will go into hiring and Prufrock, enabling the point-to-point small vehicle model in limestone and desert to be replicated. Funds like Human Capital, which have co-invested for five years, will use this round to invite engineers for a fully funded visit, directly turning the financing narrative into a hiring funnel. The money is not first going to dig the New York-Washington super loop, but to cities with existing permits and host country checks. The motivation is to sell "faster, smaller tunneling machines" as a deliverable network amid narratives of uncontrolled costs in surface public transport and subways.
In contrast to the stagnation of Hyperloop proposals and the high costs and low reuse of various countries' maglev pilot projects: Boring chooses to drive vehicles into small-diameter tunnels, using Tesla vehicles as carriages, lowering vehicle development costs, and concentrating risks on tunneling speed and station density. The industry phase is shifting from single-city demonstrations to multi-city replication, with control in permits and host country funding, not in conceptual videos. The target of 100 cities is a hiring slogan, not an approved route map.
The structural change belongs to capital concentration. The mechanism is: the pricing power of urban congestion lies with those who can simultaneously obtain underground rights and low kilometer costs; when sovereign funds write unstarted kilometers into valuations, tunneling companies can exchange equity for orders, then use those orders to hire for the next kilometer. The more expensive surface road rights become, the higher the option value of underground small cross-section networks, regardless of whether passengers have already ridden on those 150 kilometers.
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If the leading country is also a customer, the valuation buys pending excavation orders.
Single-city operations attract passengers, while multi-city sales are about replicable tunneling rhythms.
Simultaneous hiring on financing day indicates that money has turned into construction time.