Lower middle market private equity
Building Enduring Value Through Principled Partnership.
invests in founder-led and family-owned businesses with enterprise values of $20M-$200M in the U.S. and beyond.
Reference Structure Signal
Firm-level positioning followed by investor pathways and value-creation narratives.
The Firm
Institutional Investors
Family Offices
Investment Perspectives
Reference HTML & CSS Framework
Homepage structure mapped to institutional capital-market patterns.
This format front-loads proof points, then routes visitors into advisory pathways and recurring insights.
The Firm
Global navigation lane for high-intent decision-makers.
Institutional Investors
Service architecture grouped by mandate and counterparty type.
Family Offices
Outcome and credential evidence surfaced before long-form copy.
Investment Perspectives
Insight pipeline designed for recurring board and management review.
Why Sentinel
Built for partnership, not financial engineering.
Operational Partnership
We invest behind management teams and provide strategic support without replacing leadership.
Long-Term Orientation
Flexible hold periods aligned with building real value, not exit timelines.
Founder-Friendly Terms
We structure deals that protect seller equity, employee continuity, and brand legacy.
Structure
Built for how this industry evaluates credibility and fit.
Owners & Boards
Decision-makers evaluating outcomes, timing, and execution confidence.
Investors & Capital Partners
Counterparties focused on quality of process, governance, and data readiness.
Intermediaries
Referral and deal-network partners who expect clear positioning and credibility signals.
Portfolio
Representative platform and add-on investments.
Platform Investment
Precision Components Holdings
Manufacturing
Partnered with founding family
2023$45M-$65M
Platform Investment
National Industrial Services
Industrial Services
Management-led partnership
2022$55M-$80M
Add-On Acquisition
Regional HVAC Services
Industrial Services
Added to portfolio platform
2024Undisclosed
What We Do
Disciplined investment criteria with operational value creation support.
Specialty Manufacturing
Precision and contract manufacturers with differentiated capabilities and defensible market positions.
Industrial Services
Mission-critical service providers with recurring revenue and strong customer relationships.
Value-Added Distribution
Distributors with technical sales capability and inventory-light models.
Business Services
B2B services companies with high retention and scalable operating models.
Our Team
Investment professionals and operators working as one team.
Marcus J. Sentinel
Founder & Managing Partner
25 years in private equity and investment banking with deep industrial sector expertise.
Katherine L. Adler
Partner
15 years investing in lower middle market businesses with operational value creation focus.
Features & Format
Designed as a conversion platform, not just a brochure.
Proof-Led Homepage Format
Lead with measurable outcomes, then services, then team credentials.
Institutional Service Packaging
Capabilities grouped by mandate type with scannable decision criteria.
Board-Ready Insight Format
Short, high-signal commentary with explicit implications and action steps.
Investment outcomes vary by strategy, market conditions, and portfolio company execution.