---
title: "Tesla–SpaceX merger: the exchange ratio, valued part by part"
description: "The market prices one Tesla share at 2.52 SpaceX shares. Our two sum-of-the-parts base cases give 3.93. What each number assumes about robotaxis and orbit."
date: 2026-10-25
updated: 2026-10-25
tags: [valuation, sum-of-the-parts, mergers]
author: "Allen Yan"
image: https://sweetvaluelab.com/blog/img/c871b340ea0487b9.png
lang: en
canonical: https://sweetvaluelab.com/blog/tesla-spacex-merger-exchange-ratio
---

On the evening of October 20, on [SpaceX](https://sweetvaluelab.com/stocks/spcx)'s third-quarter call, Elon Musk said the boards of SpaceX and [Tesla](https://sweetvaluelab.com/stocks/tsla) had each formed a special committee of independent directors to discuss combining the two companies. No terms are agreed, he is on neither committee, and he called treating a deal as certain ["overstating it"](https://www.nbcnews.com/business/business-news/elon-musk-spacex-tesla-merger-rcna604685). The stocks did what stocks do with that kind of sentence. SpaceX closed the next day up 7.8% and Tesla up 3.4%.

I have a reason to care beyond the headline. This site publishes a sum-of-the-parts valuation of each company: [Tesla's](https://sweetvaluelab.com/stocks/tsla/valuation/sum-of-the-parts) since September, [SpaceX's](https://sweetvaluelab.com/stocks/spcx/valuation/sum-of-the-parts) since last week. A merger turns the two into one question, the exchange ratio: how many SpaceX shares one Tesla share should become. In this post I put the two models on one ruler, compare the ratio they give with the ratio the market already prices, and work backwards from the market's number to what it assumes.

## The market's exchange ratio: 2.52 SpaceX shares per Tesla share

Before anyone negotiates a ratio, the market quotes one. Divide Tesla's share price by SpaceX's and you get the number of SpaceX shares one Tesla share would buy today. At the closes of October 23, that is $372.22 ÷ $147.49 = 2.52. No model is involved.

The graph below tracks that ratio every trading day since SpaceX listed on June 12.

![Line chart of Tesla's share price divided by SpaceX's, daily, from 2026-06-12 to 2026-10-23, with dashed lines at three model ratios](https://sweetvaluelab.com/blog/img/fddfbc91295d0a2f.svg "Tesla's price ÷ SpaceX's, daily closes, 2026-06-12 to 2026-10-23. The ratio opened at 2.53 and closed at 2.52; its range was 2.01 (June 16) to 3.24 (July 22). Our base cases give 3.93, the bear cases 2.45, the bull cases 1.57. Closes from FMP.")

The ratio moved more than either price. It fell to 2.01 four days after the listing, when SpaceX traded at $201.80, and peaked at 3.24 on July 22, the day before Tesla fell 14.5% in one session. Since late August it has stayed between 2.21 and 2.59. The merger talk barely moved it: 2.53 on October 20, 2.43 on October 21, 2.52 on Friday. Both stocks rose on the news by similar amounts, which is what you would expect if the market believes a deal would come close to today's ratio.

At those prices the two companies are worth $1.47 trillion (Tesla, 3,949.5 million shares on its latest 10-Q cover) and $1.94 trillion (SpaceX, 13,181.8 million). Strike a deal at the market ratio and Tesla holders own 43% of the combination. SpaceX holders own 57%.

## Two sums of the parts on one ruler

A sum of the parts values each business on what its own peers trade at, adds net cash, and treats businesses with no revenue line yet as options: a 2030 build, discounted back at 10% a year, less what it costs to build. Both pages use the same engine and the same conventions, so their results can be divided by each other. Both also rest on the 10-Q for the quarter ended June 30, 2026, which is the last one each company has filed.

The two are close to identical in method, though not exactly. Both value their 2030 builds at a 10% required return and a 20% tax rate, and both add net cash once for the whole company. Tesla's carmakers are on price to sales, which already carries those peers' own cash, so a little cash is counted twice on that line; every other line on both pages is on EV to sales. SpaceX's twelve months include a year copied by hand from its June prospectus, because it has filed no 10-K yet. None of these differences moves a per-share value by more than a few percent. The options move it by multiples: Tesla's base case is $97.03 a share and its bull case $539.53.

The table holds the base case of each, in billions of dollars.

| Part | Tesla | SpaceX |
|---|---:|---:|
| Filed businesses at peer multiples | Automotive $53.0B, Energy $38.4B, Services $9.1B | Space $16.2B, Connectivity $69.4B, AI $25.6B |
| Net cash, June 30 | $34.2B | $60.6B |
| Options, 2030, net of capital | FSD $68.8B, Robotaxi $122.2B, Optimus $16.4B | Orbital compute $121.2B |
| Total | $342.1B | $293.0B |
| Shares the case divides by | 3,525.8M | 11,879.7M |
| Per share | $97.03 | $24.67 |
| Market value, 2026-10-23 | $1,470.1B | $1,944.2B |

Two things stand out. In the base case Tesla is the larger company, $342.1 billion against $293.0 billion; the market has it the other way round by $474 billion. And Tesla's base case leans harder on options: 61% of its value is FSD, robotaxi and Optimus, against 41% of SpaceX's in orbital compute.

The share counts differ from the covers on purpose. Each company has a large restricted award to Musk that vests only on milestones (a $2 trillion to $8.5 trillion market value for Tesla's, a Mars colony or 100 terawatts of off-Earth compute for SpaceX's). A case divides by the shares that would exist in it, so Tesla's award counts only in its bull case and SpaceX's in none.

Against the price, both base cases sit far below. Tesla is overvalued by 284% vs model and SpaceX by 498% vs model. In dollars, $1,128 billion of Tesla's market value sits above its base case, and $1,651 billion of SpaceX's.

## The model's exchange ratio: 3.93 in the base case

The exchange ratio a valuation implies is the value of one Tesla share divided by the value of one SpaceX share. It is the market ratio's formula with model values in place of prices.

Take the base case first:

```
exchange ratio = Tesla value per share ÷ SpaceX value per share
               = $97.03 ÷ $24.67
               = 3.93
```

A Tesla holder offered 3.93 SpaceX shares would, at Friday's SpaceX price, receive $580 of stock for a share that closed at $372.22. That is a 56% premium over the market ratio. On the base cases, 2.52 short-changes Tesla holders.

The other two cases give different answers, and the direction matters more than the size:

| Case | Tesla per share | SpaceX per share | Ratio | Tesla holders' share of the combination |
|---|---:|---:|---:|---:|
| Bear | $23.20 | $9.45 | 2.45 | 42% |
| Base | $97.03 | $24.67 | 3.93 | 54% |
| Bull | $539.53 | $343.24 | 1.57 | 34% |
| Market, 2026-10-23 | $372.22 | $147.49 | 2.52 | 43% |

The ratio is mostly a bet on one option against the other. The bull case favours SpaceX holders because its biggest single part is SpaceX's: 100 GW of compute in orbit by 2030, worth $3.81 trillion today net of $1.65 trillion of satellites, against Tesla's 2.5 million robotaxis at $1.57 trillion. The base case favours Tesla because its robotaxi and FSD options ($191.1 billion together) are 56% of Tesla's total, while a 10 GW orbital build is 41% of SpaceX's.

The bear case is the one I find most curious. It counts only what the two companies already sell, plus cash: $81.8 billion for Tesla and $112.3 billion for SpaceX. Its ratio is 2.45. That is within 3% of the market's. Put differently, whatever premium the market pays for the future, it pays in nearly the same proportion to what each company sells today: 16.0 times the bear case per share for Tesla, 15.6 times for SpaceX.

One correction to keep in mind. SpaceX reported its third quarter on October 20, and when I [reran its page on the twelve months to September](https://sweetvaluelab.com/blog/spacex-q3-2026-revenue-161-the-valuation-moves-2) with every assumption unchanged, the base case rose to $26.74. On that number the base-case ratio is 3.63. Tesla reported on October 21. I have not rerun it yet. Neither page moves until the 10-Qs are filed.

## Working backwards: 2.52 means 23.5 GW in orbit, or no robotaxi at all

A ratio is one number, so it can only pin down one unknown. Hold everything at the base case except one part, and solve for the size that part must reach for the model's ratio to equal the market's.

Start with SpaceX's orbital compute. Every gigawatt in orbit by 2030 adds $12.12 billion of value today at the base economics ($10,000 of revenue a kW a year, a 30% margin, 20 times, $25,000 a kW to build). For the ratio to fall to 2.52 with Tesla at $97.03, SpaceX must be worth $97.03 ÷ 2.52 = $38.44 a share, or $456.7 billion across its 11,879.7 million shares. The rest of the base case supplies $171.8 billion, so orbital compute must supply $284.9 billion. That is 23.5 GW.

![Curve of the exchange ratio against GW of compute in orbit by 2030, falling from 6.7 at zero to 1.3 at 60 GW, with the base case and the market marked](https://sweetvaluelab.com/blog/img/4b56d83b7b42122e.svg "Tesla at its base case of $97.03 a share; SpaceX at its base case except orbital compute. At 10 GW in orbit by 2030 the ratio is 3.93; the market's 2.52 on 2026-10-23 corresponds to 23.5 GW. The company's own goal is 100 GW launched a year.")

The curve falls steeply at first and then flattens. Going from 10 GW to 23.5 GW moves the ratio from 3.93 to 2.52; going from 23.5 GW to 60 GW moves it only to 1.28. Most of the argument between the base case and the market lives in the first 15 gigawatts.

Now run it the other way. Hold SpaceX at its base case of $24.67 and solve for Tesla's robotaxi fleet. A ratio of 2.52 needs Tesla at $62.25 a share, or $219.5 billion. The base case without the robotaxi is $219.9 billion. The robotaxi option has to be worth slightly less than nothing: about $0.4 billion below zero, which is a fleet of zero cars.

So the market's ratio is consistent with two very different stories. Either Tesla is everything my base case says and SpaceX puts 23.5 GW of compute in orbit by 2030 (2.35 times my base build), or SpaceX is exactly my base case and Tesla never runs a paid robotaxi. Any mix between the two works as well. The ratio cannot tell them apart. The quarterly reports eventually can.

## The premium question: what 20% to 35% would buy

Analysts at RBC and JPMorgan [expect Tesla holders to want a premium of 20% to 35%](https://www.investing.com/news/stock-market-news/teslaspacex-deal-wall-st-says-inevitable-but-musk-says-its-not-certain-4962374), on the assumption that Tesla holders would swap into SpaceX stock. On the market ratio, that is 3.03 to 3.41 SpaceX shares per Tesla share, or $447 to $503 of SpaceX stock at Friday's price. The same Reuters report says Barclays floated 0.7 of a SpaceX share as an illustrative level. At Friday's closes that would be $103 of SpaceX stock for a $372 share, so I suspect it is quoted in some other unit and leave it aside.

The table puts each set of terms on the same footing.

| Terms | SpaceX shares per Tesla share | Value per Tesla share at $147.49 | Tesla holders' share | Orbital compute it implies, 2030 |
|---|---:|---:|---:|---:|
| Market ratio, 2026-10-23 | 2.52 | $372 | 43% | 23.5 GW |
| 20% premium | 3.03 | $447 | 48% | 17.2 GW |
| 35% premium | 3.41 | $503 | 51% | 13.7 GW |
| Our base cases | 3.93 | $580 | 54% | 10 GW |

The last column is the orbital curve above, read at each ratio with Tesla held at its base case.

The case for a premium, from the Tesla side, is the one the base case makes. The businesses that already sell are close to even at peer multiples ($100.5 billion for Tesla, $111.2 billion for SpaceX), and Tesla brings the larger set of options ($207.4 billion against $121.2 billion). A combination at 2.52 hands 57% of the company to SpaceX holders. Even a 35% premium leaves the ratio below my base case's 3.93.

The case against, from the SpaceX side, is the bull case and the cash. SpaceX holds $60.6 billion of net cash to Tesla's $34.2 billion, the AI infrastructure half of its AI segment grew more than fourfold in the first half, and if orbital compute is anywhere near the company's own goal the bull ratio of 1.57 is the relevant one. In that world, a 35% premium would hand Tesla holders 51% of a company the bull case says they bring 34% of: about a sixth of the combined value, transferred.

How I read it: a 20% to 35% premium corresponds to 13.7 to 17.2 GW in orbit by 2030. That is closer to my base case than the market's 23.5 GW is. A deal struck inside the analysts' range would be priced on a more cautious view of orbit than the share prices are today. I have no view on whether it gets struck.

## The vote: half of every Tesla share

Musk said Tesla would need ["a 50% vote of all shares"](https://finance.yahoo.com/markets/stocks/articles/musk-calls-tesla-merger-vote-153329940.html), not of the shares voted. About 74% of shares voted at Tesla's 2025 annual meeting; at that turnout, the deal would need 68% of the votes cast. That is a number about turnout, and nothing in either model speaks to it.

## What would move the ratio

For someone who looks at value, the ratio moves with the two options that dominate the cases, so the numbers to watch are the ones that size them. On Tesla's side, a robotaxi fleet count and paid miles in the quarterly update, then a revenue line. On SpaceX's side, the first compute satellites launched (the prospectus plans them for 2028 at the earliest), then gigawatts in operation. Each gigawatt in orbit moves the ratio by about 0.07 in the range where the market sits; each 100,000 robotaxis by 2030 moves Tesla's base case by $6.93 a share, or 0.28 on the ratio.

For someone who trades, the number to watch once terms are announced is the spread between the agreed ratio and the market ratio, and how it changes as the vote approaches. Until then the market ratio is the only one there is, and it has stayed between 2.21 and 2.59 since late August.

## Conclusion

The market's exchange ratio of 2.52 sits almost exactly on our bear-case ratio of 2.45, between the base case's 3.93 and the bull case's 1.57. Read through the two models, it says the market expects more from SpaceX's orbital compute than my base case does (23.5 GW against 10 GW by 2030) or less from Tesla's robotaxi (nothing against half a million cars). Whichever committee wins the argument over the ratio is, in effect, winning the argument over which of those two options gets built first.

## Sources and data

- NBC News, [Musk says SpaceX and Tesla have formed special committees to discuss merger idea](https://www.nbcnews.com/business/business-news/elon-musk-spacex-tesla-merger-rcna604685), 2026-10-20.
- Reuters via Investing.com, [Wall St sees Tesla-SpaceX merger as inevitable, but split on price](https://www.investing.com/news/stock-market-news/teslaspacex-deal-wall-st-says-inevitable-but-musk-says-its-not-certain-4962374), 2026-10-21 (premium range, Barclays' illustrative ratio).
- Yahoo Finance, [Musk calls Tesla's merger vote "quite a high hurdle"](https://finance.yahoo.com/markets/stocks/articles/musk-calls-tesla-merger-vote-153329940.html), 2026-10-21 (vote threshold, 2025 turnout).
- Tesla, 10-Q for the quarter ended 2026-06-30 (0001628280-26-049270) and FY2025 10-K (0001628280-26-003952). SpaceX, 10-Q for the quarter ended 2026-06-30 (0001628280-26-052535) and IPO prospectus 424B4 (0001628280-26-042639).
- Daily closes from FMP, 2026-06-12 to 2026-10-23.
- SweetValueLab, [Tesla sum of the parts](https://sweetvaluelab.com/stocks/tsla/valuation/sum-of-the-parts) (version 3, 2026-09-20) and [SpaceX sum of the parts](https://sweetvaluelab.com/stocks/spcx/valuation/sum-of-the-parts) (version 1, 2026-10-20). Every multiple and 2030 build in this post is the one printed on those pages.

Related on this site:

- [Tesla, taken apart: a sum of the parts in three scenarios](https://sweetvaluelab.com/blog/tesla-sum-of-the-parts)
- [SpaceX Q3 2026: revenue +161%, the valuation moves $2](https://sweetvaluelab.com/blog/spacex-q3-2026-revenue-161-the-valuation-moves-2)
- [SpaceX business metrics](https://sweetvaluelab.com/stocks/spcx/kpis)