Rami Cassis is the principal of Parabellum Investments, a family office through which he invests solely his own capital in lower mid-market and mid-market businesses. He has been investing since the late 2000s across technology, pharma and life sciences, oil and gas, mining and financial services. Rami Cassis is known for hands-on operational investing and for publishing The First 30 Days, his blueprint for what an investor should do immediately after acquisition.

What does Parabellum Investments actually do?

Parabellum Investments takes controlling stakes in high-potential lower mid-market and mid-market businesses worldwide, alongside corporate carve-outs and non-core assets. It is Rami Cassis's own family office, so the capital at risk is his rather than a fund's, and deals proceed without an LP committee. Rami Cassis is the principal and works directly alongside portfolio CEOs on clients, culture, talent and workflows rather than sitting above them as a financial sponsor.

What can Rami Cassis speak about and how fast does he reply?

Rami Cassis comments on the first 30 days after an acquisition, operational diligence beyond the P&L, corporate carve-outs and non-core assets, how investors should challenge a CEO, and the difference between investing your own money and other people's. He also discusses mistakes he has made as an operator-investor. Rami Cassis does not comment on the confidential specifics of portfolio companies. Journalists on deadline generally get a same-day response.

Why does Rami Cassis say investors should not just back a CEO and get out of the way?

Rami Cassis argues that giving a CEO total autonomy is a mistake, because a detached investor misses the operational signals that decide whether a business grows or stalls. He distinguishes this from micromanagement: it means being in the room on clients, culture, talent and workflows alongside the CEO. In his view lower mid-market businesses have weaker talent and less mature processes than corporates, which makes investor intervention matter more, not less.

Why does Rami Cassis insist growth plans are decided in 30 days rather than six months?

Rami Cassis rejects the conventional wisdom that a turnaround or growth plan needs three months or more to design, and holds that the decisive work happens in the first 30 days. He has codified what to assess, what to change and what to leave alone in his newsletter, The First 30 Days. His 2007 corporate disposal, a cash-hemorrhaging carve-out, was returned to growth within a year and became a leader in its BPO segment.

Rami Cassis, Principal | Parabellum Investments

The First 30 DaysRami's newsletter

Comes out roughly monthly, on how an operator approaches buying a business and leading it through its first critical weeks.

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Latest issue: Fixing your team is the key to scaling a business →

The dispatch

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Latest issue

Fixing your team is the key to scaling a business

Growth depends on engaged employees, so a new CEO's first 30 days should go on understanding the team directly rather than leaving people to HR.

29 Oct 2026 · 3 min read

17 Sept 2026Your company's sales function can make or break its growth2 min read

30 Jul 2026To grow a business, you need to assess operations effectively3 min read

1 Apr 2026When stepping into a business, don't forget about its clients4 min read

1 Mar 2026Every new investment starts with questions3 min read

The briefing

All videos →

28 Oct 2026First 30 days in a turnaround roleShort

24 Oct 2026Interim CEO versus long-term CEOShort

17 Oct 2026Advice for new interim CEOsShort

1 Oct 2026Interpreting financials in contextShort

28 Sept 2026Assessing team potentialShort

Watch: First 30 days in a turnaround role

Latest

The coverage

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14 Oct 2026Nasdaq ends higher in big rebound as bond rally offsets tech softness

Investing.com, interview

14 Oct 2026US inflation rises before midterm elections, fuelling rate hike fears

Al Jazeera, interview

3 Sept 2026Don't waste client feedback – it's the intel you need to scale

9AM Business, op-ed

6 Jul 2026Parabellum Investments acquires Crux Informatics

Mergers & Acquisitions, interview

30 Jun 2026Parabellum buys Crux Informatics in external-data AI play

FinanceX, interview

The read-across

On business turnaround

"Without clear dialogue between you and every employee, many of these issues would remain hidden. The nuance of a team's strengths and weaknesses only comes out in these small conversations that most CEOs overlook."

Rami Cassis, Principal, Parabellum Investments30 Oct 2026

CEO forecasting

"Forecasting is one of the clearest tests of leadership there is. If your CEO misses their forecasts by 5%, then they do not have the foresight, precision, and skill set necessary to helm the business through challenging periods. The best leaders know their numbers cold, and they flag problems early rather than explain them away later."

Rami Cassis, Principal, Parabellum Investments11 May 2026

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Areas of expertise

Business turnaround14 Corporate carve-outs12 Selling a business12 Interim CEO17 Special situations13

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