An exact figure for annual industry revenue is not known with certainty. A report put out by the Caltech/MIT Voting Project sizes the industry at about $300 million, in the same range of prior publicly available market size estimates.46 The Brennan Center estimates that replacing all the voting machines in the United States would entail costs that “fall somewhere between $580 million and $3.5 billion,” and forecasts the actual figure at “well over $1 billion.”47 Including support costs, this again would translate into about a $300 million annual industry ($1 billion amortized over a 10-year useful life, plus an estimated 20% of acquisition annual cost of support). Data available online from PrivCo seem to corroborate this revenue picture, and indicate that the revenues of the top three firms (ES&S, Dominion, and Hart, which together comprise over 90% of the market) totaled approximately $351 million in 2015 (see Figure 7).48 The OSET Institute, however, believes the replacement costs will be toward the high end of the range cited by the Brennan Center, coming in slightly over $3 billion. They base their calculation on the premise that 2.45 million machines will need to be purchased to serve the 10,079 jurisdictions throughout the U.S., with the replacement cost of those machines estimated at $1,250 “per seat.” Those figures would imply that annual revenue going forward would reach $800 to $900 million (with the range depending on whether machines have a 10- or 15-year useful life). However, in the best case, it likely would take several years to reach this level due to the timing of the procurement cycle, even if funding became immediately available.