Most lists of software private equity firms begin with Vista Equity Partners and Thoma Bravo. Those lists answer the wrong question. Thoma Bravo closed its sixteenth flagship fund at $24.3 billion in June 2025, as reported by Bloomberg. A fund that size does not write $20 million equity checks, and it will never buy a $3 million EBITDA company as a platform.
The useful question is not who buys B2B SaaS companies in the abstract. It is which funds write equity checks matched to your enterprise value, and what those funds do to the business after close. A founder holding $3 million of EBITDA cares about the funds that write $10 million to $40 million checks in vertical software, not about the names on magazine covers.
This page segments SaaS acquirers by check size and mandate, the way a B2B SaaS M&A advisor builds a buyer list inside a live process. It also explains the single filter that removes most famous names from your process before outreach begins.
Which software private equity firms actually buy companies my size?
Private equity buyers of B2B SaaS sort into five tiers by fund size. Each tier writes a different check, buys a different EBITDA range, and holds for a different period. The table reflects market convention and publicly reported fund sizes, not any single firm’s stated mandate, and individual funds vary.
| Fund tier | Typical equity check | EBITDA range they buy | Platform or add-on posture | Hold period |
|---|---|---|---|---|
| Mega funds ($10B and up) | $500M and up | $50M and up | Platforms and take-privates; add-ons run through portfolio companies | 4 to 6 years |
| Upper middle market ($2B to $10B) | $100M to $500M | $15M to $50M | Platform first, then 3 to 8 add-ons per platform | 4 to 6 years |
| Core middle market ($750M to $2B) | $40M to $150M | $5M to $20M | Mix of new platforms and larger add-ons | 4 to 7 years |
| Lower middle market ($150M to $750M) | $10M to $40M | $1M to $8M | Platforms at this size; also feeds add-ons to upstream funds | 4 to 7 years |
| Perpetual holders (balance sheet) | $5M to $50M | $1M to $10M | Every acquisition held permanently; no exit event | Indefinite |
The mega funds and the upper middle market
Vista Equity Partners and Thoma Bravo dominate large software buyouts and take-privates. Their check sizes start where most founder-led SaaS companies end. If your enterprise value sits below $200 million, these firms matter to you only later, as the eventual buyer of the platform that buys you first.
The lower-middle-market software specialists
Funds such as Mainsail Partners, Level Equity, PSG, Battery Ventures, and Alpine Investors back bootstrapped and founder-led software companies well below the mega fund threshold. Check sizes at this tier typically run $10 million to $75 million depending on the vehicle. These firms move on companies with $1 million to $10 million of EBITDA or equivalent ARR scale, which is where most founder exits happen.
Structure varies within this tier. Majority recapitalizations let a founder sell 60 to 80 percent of the business, take cash at close, and keep the rest as rollover equity. Minority growth checks of 20 to 49 percent exist at several of these firms as well, though most sale processes at $1 million to $10 million of EBITDA end in a change of control.
The perpetual holders
Constellation Software has acquired more than 500 vertical market software businesses since 1995, according to its published acquisition criteria, and operates through groups including Volaris, Harris, and Jonas. Valsoft, Banyan Software, and ESW Capital run comparable buy-and-hold models at smaller scale. These acquirers buy from a permanent balance sheet, price on EBITDA, and never resell, which changes both the price and the experience after close.
What is the 2 to 10 percent rule, and why does it reframe my buyer list?
Fund managers target a platform equity investment of 2 to 10 percent of committed capital. Below 2 percent, the deal cannot move fund returns and loses partner attention across a 4 to 7 year hold. Above 10 percent, the position concentrates the fund beyond what most limited partners accept.
Apply the rule to real numbers. Thoma Bravo’s $24.3 billion flagship implies a minimum platform check near $486 million. A $500 million fund, by contrast, writes platform checks of roughly $10 million to $50 million. If your deal needs a $15 million to $40 million equity check, your true platform buyers manage roughly $300 million to $1.5 billion.
This filter reframes who is actually a buyer. It removes the 20 most recognizable names in software private equity from most lower-middle-market processes. It replaces them with 40 to 80 sector funds, many raised within the past 5 years, that close deals at your size every quarter and rarely appear in headlines.
Will my company be a platform or an add-on?
The same fund can buy your company two different ways, and the difference shows up in price, management terms, and speed. Windsor Drake’s published SaaS valuation multiples data puts standalone PE platform acquisitions at 4 to 6x revenue in the lower middle market, with add-ons at 3 to 5x. That spread of 1 to 2 turns of revenue is the largest structural pricing gap inside a PE process.
Price favors the platform path on average, because the fund underwrites your team, your systems, and your roadmap as the foundation for 3 to 8 future acquisitions. Add-ons price against cost synergies, and the platform’s deal team negotiates acquisitions for a living. The exception is specific revenue synergy. The Windsor Drake Fintech M&A Deal Database, which tracks 187+ transactions across 23 sub-sectors, records add-on entries for vertical SaaS with embedded payments at 5.5x to 7.5x revenue where the acquirer monetized the seller’s payment volume from day one.
Management retention differs just as much. A platform deal keeps the founder or a named successor in seat for 2 to 4 years, usually with a 10 to 30 percent equity rollover into the new holding company. An add-on makes retention negotiable, so founders who want a clean exit within 12 months are often better matched to add-on buyers than to platform sponsors.
Speed runs the other way. Platform diligence takes 90 to 150 days because the fund underwrites a new thesis from zero, including a debt package that typically carries 3 to 5 turns of EBITDA in borrowing. A platform buying its fourth add-on can close in 60 to 90 days on a diligence playbook it has already run. The parallel trade-offs against corporate acquirers are covered in strategic buyers vs financial buyers.
Ownership also changes daily operations. A platform sponsor typically installs a 100 day plan, moves the board to a monthly cadence, and recruits a CFO within the first 6 to 12 months if one is not already in place. Add-on sellers integrate into the platform’s existing finance, sales, and support functions instead, on a timeline the platform controls.
Does the age of the fund change the price I get?
Fund vintage is a negotiating input most sellers never check. A fund in years 1 through 3 is deploying capital, hunts new platforms, and can promise a full 5 to 7 year hold. A fund in years 5 through 7 is managing what it owns, adds on through existing platforms, and rarely underwrites a new platform at all.
A firm raising its next vehicle carries a separate motivation. It needs to show limited partners deployment, marks, and pipeline, which makes it quicker to commit and more flexible on structure in the 6 to 12 months before a fund close. Your advisor should know which Tier 1 candidates are in market with a new vehicle before the first management meeting is scheduled.
Vintage also sets your second horizon. A platform bought in year 6 of a 10 year fund will likely be resold within 3 to 4 years, which matters when you are rolling 20 percent of your equity into the next chapter. Fund closing dates are public in SEC Form ADV filings and press releases, so this is checkable homework, not guesswork.
How do the perpetual holders change the math?
Serial acquirers sit outside the fund model entirely, so the 2 to 10 percent rule does not apply to them. No fund clock forces an exit, and no investment committee answers to outside limited partners on deployment pace. Constellation’s operating groups and firms like Valsoft and Banyan can move from letter of intent to funding in 60 to 90 days because they buy with cash they already hold.
The trade is price for certainty. Perpetual holders price on EBITDA and rarely top a competitive auction, since their model depends on reviewing 100 opportunities to buy a handful rather than winning any single contested deal. They still belong in most processes with $1 million to $10 million of EBITDA, because a credible offer from a permanent holder sets a floor under every fund bid.
How does Windsor Drake tier PE buyers in a SaaS process?
The Windsor Drake Buyer Tiering Model splits the buyer universe into three tiers. Tier 1 holds 5 to 10 parties with a clear thesis, demonstrated sector acquisition activity, and confirmed capacity. Tier 2 holds 10 to 20 parties with a logical thesis that requires internal validation. Tier 3 holds 15 to 30 opportunistic parties included for coverage, which keeps a full sell-side process between 30 and 60 contacted buyers.
For PE buyers, the capacity screen combines the 2 to 10 percent rule, fund vintage, and reported dry powder. The activity screen requires at least one closed transaction in the seller’s sub-sector within 24 months. A fund that publishes vertical SaaS commentary but has not closed a vertical SaaS deal in 2 years belongs in Tier 2, not Tier 1.
Every Tier 1 candidate must pass the Acquisition Thesis Test before outreach: “[Buyer] would acquire [Target] because it solves [problem] by providing [capability], which enables [outcome].” When the sentence cannot be completed with specifics for a given fund, that fund is coverage, not a buyer. A completed example reads like a memo line: a sponsor with two field service platforms would acquire a $6 million ARR dispatch software company because it solves technician scheduling by providing route optimization, which enables the platform to push net revenue retention above 110 percent. That sentence names the motive, and it is checkable against the fund’s portfolio page. The Windsor Drake Fintech M&A Deal Database supports the screen with pricing evidence, including a 0.5x to 1.5x revenue premium for sellers whose Tier 1 list contained 3 or more sponsors already operating platforms in the same sub-sector.
PE demand at this end of the market is measurable. Windsor Drake’s valuation research counts 73 PE-led enterprise SaaS transactions in Q1 2025, a 66 percent increase over 2024, even as strategic acquirers took 62 percent of lower-middle-market SaaS deal volume. Both buyer types belong in a well-run process. The tiering decides which of them earns partner-level attention and a management meeting.
What this means for a seller
Build your buyer list from check size, mandate, and fund vintage rather than brand recognition. A vertical SaaS company with $2 million to $8 million of EBITDA typically has 30 to 60 credible PE and serial acquirer buyers, and the ones who pay best are identified 12 to 24 months before a process starts.
Questions founders ask
Which private equity firms buy small SaaS companies?
Funds such as Mainsail Partners, Level Equity, PSG, Battery Ventures, and Alpine Investors back founder-led software companies, and perpetual holders such as Constellation Software, Valsoft, Banyan Software, and ESW Capital buy vertical software with $1 million to $10 million of EBITDA. The 2 to 10 percent rule means your platform buyers are funds of roughly $300 million to $1.5 billion, not the mega funds.
How much EBITDA do I need to sell to a private equity firm?
Perpetual holders and lower-middle-market platforms buy from about $1 million of EBITDA. Below that level, growth equity firms underwrite on ARR instead, typically from $2 million to $5 million of recurring revenue. Windsor Drake advises companies with $1 million to $20 million of ARR or EBITDA.
Do private equity firms pay less than strategic buyers?
Usually. Windsor Drake’s published valuation data shows strategic acquirers paying 1.5 to 2.0x more than private equity, with PE platform acquisitions at 4 to 6x revenue and add-ons at 3 to 5x in the lower middle market. A dual-track process that includes both buyer types is how sellers close that gap.
What is the difference between a platform and an add-on acquisition?
A platform is a fund’s first entry into a sector, priced at 4 to 6x revenue, with the founder typically staying 2 to 4 years and rolling 10 to 30 percent of equity. An add-on bolts onto an existing platform, prices at 3 to 5x, closes faster, and makes founder retention negotiable.
How long does private equity hold a SaaS company before selling?
Most funds hold platforms 4 to 7 years. Fund vintage shifts that window: a platform bought in year 6 of a 10 year fund may be resold within 3 to 4 years. Perpetual holders such as Constellation Software never resell.
Last reviewed July 28, 2026 by Jeff Barrington, Founder and Managing Director, Windsor Drake. Content on this page may be cited with attribution and a link to https://windsordrake.com/private-equity-firms-that-buy-saas-companies/