PE Take-Private History & the Rate-Shock Stress Test

A chronological history of private-equity take-privates in cybersecurity — from the first small buyouts of 2009 to the mega-deals of the 2020s — and a structured analysis of the risk that now sits under the whole portfolio: leveraged buyouts struck in the near-zero-rate ("ZIRP") era must now service floating-rate debt after the sharpest rate shock in four decades. For the sponsors themselves, see Thoma Bravo, Vista, and The Sponsor Landscape; for the debt mechanics, see Lenders & Credit and Private Credit.

Why this matters

Private equity is the dominant ownership form in scaled cybersecurity. Most of the sector's best-known "vendors" — Proofpoint, Sophos, Barracuda, Mimecast, SailPoint (until its 2025 re-IPO), Imperva (until its 2023 sale), KnowBe4 — spent recent years as sponsor-owned, debt-financed private companies. That structure was built for one interest-rate world and now operates in another. The buyouts of 2016–2021 were underwritten when money was nearly free; the debt on them is mostly floating-rate, so when policy rates rose roughly five points in eighteen months, the interest bill on these companies rose with it. Understanding the history and the leverage is therefore not academic — it is the single largest financial variable hanging over a large share of the industry's supply.

The three waves of cyber take-privates

Wave 1 — proof of concept (2009–2015). Thoma Bravo effectively invented the cyber-buyout playbook with small, high-return deals: Entrust (2009), SonicWall (2010, ~$717M — flipped to Dell in 2012 for ~$1.2B), Tripwire (2011), and Blue Coat (2012, ~$1.3B; later resold and ultimately absorbed by Symantec in 2016 for ~$4.65B). Vista took Websense private (2013, ~$900M), later reshaped into Forcepoint. These were modest checks that established the thesis: cybersecurity throws off durable, recurring, mission-critical revenue that services debt well and rewards operational discipline.

Wave 2 — the ZIRP scale-up (2016–2021). With policy rates pinned near zero and leveraged-loan money abundant and cheap, the deals got large. KKR bought a majority of Optiv (2017, ~$2B); Thoma Bravo took Barracuda private (2018, $1.6B) and Imperva (2018, $2.1B), then Sophos (2020, $3.9B) and, at the top of the market, Proofpoint (2021, $12.3B) — still the largest cyber take-private on record. Cheap, plentiful, covenant-light debt let sponsors pay high multiples and lever aggressively.

Wave 3 — deals struck into the rate shock (2022–2024). The buyout machine kept running even as rates turned. Thoma Bravo took SailPoint private (2022, $6.9B) and Ping Identity (2022, $2.8B), bolting in ForgeRock (2023, $2.3B); Permira took Mimecast private (2022, $5.8B); Vista took KnowBe4 private (announced 2022, closed Feb 2023, $4.6B); KKR bought Barracuda from Thoma Bravo (2022, ~$3.8–4B); and Thoma Bravo took Darktrace private (2024, $5.3B). Several of these were financed precisely as the cost of that financing was climbing.

The take-private ledger (chronological)

(Values are enterprise value as reported at announcement; some early figures are equity value. Sources: sponsor and company releases and contemporaneous reporting — see Sources.)

The ZIRP era: how near-zero rates manufactured the boom

From the 2008 financial crisis through 2021, US policy rates sat at or near zero for almost the entire period (the "zero interest-rate policy," ZIRP). That environment is the hidden engine behind the buyout wave:

• Cheap debt. Leveraged buyouts are financed mostly with debt, and in the ZIRP years that debt was both abundant and inexpensive — all-in coupons on software term loans frequently sat in the 4–5% range, and at times lower.
• Higher leverage, higher prices. Cheap debt let sponsors lever cyber companies at 6–7x EBITDA or more and still clear their return math, which in turn supported the rich purchase multiples of Wave 2 and 3 (Proofpoint at $12.3B being the extreme).
• Recurring revenue as collateral. Lenders underwrote software and cyber on ARR and retention, not hard assets — a company with sticky, non-discretionary subscriptions could carry debt a traditional industrial never could.
• Covenant-light, repriceable structures. Borrower-friendly terms and easy repricing meant sponsors could refinance cheaper again and again — as long as rates stayed low.

The model's unspoken assumption was rate continuity. That assumption broke.

The rate shock (2022–2024)

Beginning in March 2022 the Federal Reserve raised rates at the fastest pace in four decades to fight inflation. The Secured Overnight Financing Rate (SOFR) — the benchmark most leveraged loans float over — went from roughly 0% in 2021 to a peak of about 5.40% in December 2023, and the fed-funds target reached 5.25–5.50%, held through much of 2024. Easing began in late 2024 and continued through 2025; by mid-2026 the target is 3.50–3.75% with SOFR near 3.65% — meaningfully off the peak, but still multiples of the near-zero base every Wave 2 and 3 deal was underwritten against.

Because the debt is floating-rate, this was not a distant macro event — it flowed straight into each company's interest bill.

The debt-servicing math — an illustrative stress test

The mechanism is simplest to see in a worked example. The figures below are illustrative — chosen to show the sensitivity, not to describe any specific company's actual capital structure.

Take a company bought at $3.0B EV at ~7x EBITDA (≈$430M EBITDA), funded with a $2.1B floating-rate term loan (≈5x leverage) priced at SOFR + 4.0%:

At the peak, interest expense on the same debt more than doubled — a swing of roughly $110M a year that comes straight out of free cash flow. For a company levered 6–7x and growing modestly, interest can move from consuming a fifth of EBITDA to nearly half, leaving little for debt paydown, bolt-on M&A, or a sponsor dividend. The 2026 retracement helps but does not undo it: the bill is still nearly 2x the entry cost.

What the negative scenarios look like

Ordered roughly from mild to severe. Cyber's saving grace — durable, non-discretionary, high-retention revenue (see Core Concepts, "Demand You Didn't Choose") — is what keeps most names in the milder tiers.

1. FCF squeeze and stalled deleveraging. Higher interest absorbs the cash that would have paid down debt or funded tuck-ins. The company is fine operationally but the equity return compresses and the hold extends. This is the base case for most of the portfolio.
2. Growth-plus-margin scramble. To defend cash flow, sponsors push price increases, net-revenue-retention initiatives, and cost cuts (the standard operating playbook, now run under duress). Over-cutting go-to-market to protect FCF can quietly impair the growth that justified the multiple.
3. Amend-and-extend / "extend and pretend." Rather than refinance into a hostile market, borrowers negotiate to push maturities out and adjust terms — buying time in the hope rates fall (as they partly have). Widespread in software credit since 2023.
4. PIK toggles, covenant relief, equity cures. Switching interest to payment-in-kind (added to principal rather than paid in cash), loosening covenants, or the sponsor injecting fresh equity to "cure" a breach. Preserves liquidity but raises the ultimate payoff bar.
5. Dividend recaps halted; rescue equity in. The dividend-recapitalization playbook of the ZIRP years stops; instead of taking cash out, sponsors put cash in to hold the structure together.
6. Refinancing / maturity wall. 2021-vintage loans maturing in 2026–2028 must be refinanced at materially higher coupons even after the retracement — a step-up in permanent cost, and a live catalyst for the names taken private at the top.
7. Liability-management exercises (LMEs) and distressed exchanges. Aggressive restructurings — priming, collateral moves, "lender-on-lender violence" — when a capital structure is genuinely stressed.
8. Covenant breach → default → restructuring. The tail: lenders convert to owners, equity is wiped or heavily diluted, the company is recapitalized. Rare for high-retention cyber assets, but not impossible for a deal bought at a peak multiple with thin growth.

Which names carry the most rate risk

Exposure rises with (a) how high the entry multiple was, (b) how much leverage was used, and (c) how modest the growth is. By that logic the most rate-sensitive situations are the 2021–2023 peak-vintage, large-EV, lower-growth deals — Proofpoint ($12.3B, 2021), Mimecast ($5.8B, 2022), KnowBe4 ($4.6B, 2023), and the identity roll-ups (SailPoint pre-IPO, Ping+ForgeRock) — where a rich price met the most expensive money. The least exposed are the earlier, smaller-multiple holds and the higher-growth assets whose ARR expansion outruns the interest step-up.

Two facts cut the other way and explain why the sector has not seen a wave of cyber-LBO defaults:

• Rates have retraced. From the 5.40% peak to ~3.65%, the worst-case interest math has eased by roughly a third, and further cuts would ease it more.
• Exits are reopening. SailPoint's 2025 re-IPO at ~$12.8B — nearly double its 2022 take-private price — is the clearest proof that the take-private → improve → re-list loop still works, that the public window is reopening for quality cyber assets, and that strong ARR growth can outrun even an expensive balance sheet. Imperva's 2023 sale to Thales at a $3.6B EV (from a $2.1B entry) showed the strategic-exit route was open even at the rate peak.

The honest read: for most sponsor-owned cyber companies the rate shock is a return problem, not a solvency problem — it compresses IRRs, lengthens holds, and delays exits rather than threatening the business. The genuine danger concentrates in the handful of peak-multiple, highly levered, slow-growth deals that must refinance into a permanently higher-rate world before growth or a sale bails them out. That is the specific scenario to monitor deal by deal.

→ Cross-references: Private Equity, Thoma Bravo, Vista, The Sponsor Landscape, Lenders & Credit, Private Credit, Capital Markets & Macro, Valuation Benchmarks, Bear Case & Disruption.

Sources

• Permira / Mimecast $5.8B (2022): Permira, Goodwin
• Vista / KnowBe4 $4.6B (2022→Feb 2023): Vista, BusinessWire
• Thoma Bravo / Imperva $2.1B (2018); Thales / Imperva $3.6B (2023): SecurityWeek, Help Net Security, Thoma Bravo
• Thoma Bravo / Barracuda $1.6B (2018); KKR / Barracuda (2022): Thoma Bravo, SecurityWeek, PE Insights
• KKR / Optiv majority (2017): Optiv/BusinessWire
• Early history — Entrust/SonicWall/Tripwire/Blue Coat; Vista/Websense: PitchBook, SecurityWeek (Blue Coat), eWeek (Websense)
• Rate path — SOFR / fed funds 2021–2026: NY Fed / Federal Reserve H.15, FRED SOFR

Updated 2026-08-16 18:13 UTC · © El Dorado Capital · el-doradocapital.com · Market intelligence for informational purposes only; not investment advice.