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EX-99.1

Exhibit 99.1

Andersen Group Inc.

333 Bush Street

Suite 1700

San Francisco, CA 94104

Andersen Group Delivers Record Second-Quarter Revenue of $217.7 Million

Six-Month Revenue Reaches $458.4 Million, Up 19.4%, with All Service Lines Contributing to Broad-Based Growth

San Francisco, August 12, 2026 — Andersen Group Inc. (NYSE: ANDG) today reported robust financial results for the second quarter and six months ended June 30, 2026, marked by accelerating revenue growth, expanding client demand, and a sharp rise in underlying profitability.

Momentum Builds Across the Platform

Andersen delivered second-quarter revenue of $217.7 million, up 23.7% from $176.0 million in the prior-year quarter — continuing a multi-year trend of double-digit growth. For the first six months of 2026, revenue reached $458.4 million, up 19.4% from $384.1 million in the same period last year. This revenue growth was fueled by strong client additions, higher volumes, and continued service line expansion — with every service line posting revenue growth in both the quarter and the six-month period, and with no reliance on one-time items to drive the results. This broad-based strength underscores the durability of Andersen’s diversified platform and the growing demand for its multi-dimensional service offering, led by consistent revenue in the Tax practice and accelerating momentum in Andersen Consulting.

Underlying Profitability Strength as Equity Compensation Normalizes

Reported results for the quarter and six months reflect equity-based compensation expense, a non-cash item tied to

Andersen’s talent and retention strategy. Notably, equity-based compensation expense declined meaningfully to $48.3 million in the second quarter of 2026, down from $129.6 million in the second quarter of 2025 — and totaled $93.9 million for the six months, also well below the $129.6 million recorded in the same period last year. As a result of the timing and magnitude of this non-cash expense relative to the prior year, the Company reported a net loss of $10.1 million ($0.08 basic / $0.09 diluted per share) in the second quarter and a net loss of $96.0 million in the prior year quarter a year ago. Management views the strong and growing adjusted net income figures as the clearer signal of the business’s underlying momentum, with equity-based compensation expense expected to continue moderating as a percentage of revenue.

Andersen’s core earnings power continued to improve, with adjusted net income rising to $39.0 million in the second quarter, up 38.8% from $28.1 million a year ago, and to $106.3 million for the six months ended June 30, 2026, up 27.5% from $83.3 million in the prior-year period. This growth reflects the operating leverage inherent in Andersen’s scalable model as revenue outpaced expenses during the six months ended June 30, 2026.

Looking Ahead

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Reaffirm Full-Year 2026 Guidance: Revenue expected to be in the range of approximately $980 million to

$1 billion, equating to a growth rate of approximately 18%. Adjusted EBITDA projected in the range of approximately $225 million to $250 million with Adjusted EBITDA margins in the range of approximately 23% to 25%.

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Investing in Tomorrow’s Growth: 2026 will reflect continued strategic investment in talent, technology, automation, and AI, as well as the integration of newly acquired firms — positioning Andersen for an anticipated return to full-year net income and positive EPS while building durable long-term capacity.

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A Platform Built for the Long Term: Andersen believes it remains well positioned for sustained revenue growth and expanding margins, backed by a large and growing addressable market, differentiated competitive positioning, a highly scalable operating model, and disciplined, selective M&A.

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Disciplined Capital Deployment: Andersen remains committed to deploying capital strategically to strengthen and expand its multi-dimensional platform, with a continued focus on driving long-term shareholder value.

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Mark L. Vorsatz, Global Chairman and CEO of Andersen, said:

“Our results speak for themselves,” said Mark Vorsatz, Global Chairman and CEO of Andersen. “Revenue grew 23.7% in the quarter, every service line contributed, and adjusted net income grew even faster than revenue — indicating that our platform is scaling efficiently even as we invest aggressively in talent, technology, and AI. The reported net loss is simply a function of non-cash equity compensation; it doesn’t reflect the momentum we’re building. We like where this business is headed.”

Recent Developments—Inorganic Growth Opportunities

Andersen’s relationships with over 400 Andersen Global and Andersen Consulting member and collaborating firms provide opportunities for domestic and international expansion through closer partnerships, future acquisitions and future business combinations. In the second quarter of 2026, the Company closed the acquisitions

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EX-99.1

Exhibit 99.1

Andersen Group Inc.

333 Bush Street

Suite 1700

San Francisco, CA 94104

Andersen Reports Strong First-Quarter of 2026 Financial Results and Updates Full-Year Guidance

San Francisco, May 12, 2026 — Andersen Group Inc. (NYSE: ANDG) today released financial results for the first quarter ended March 31, 2026.

Andersen continued to deliver strong top-line growth

with first-quarter revenue of $240.7 million up 15.7%, compared with $208.1 million in the prior year quarter. Higher revenue in the first quarter of 2026 was supported by client growth, higher volume and service line expansion. There were no large one-time first-quarter 2026 revenue items, and all of our service lines grew revenue in the first quarter of 2026. Higher equity-based compensation expenses of $41.1 million led to net income of $17.7 million in the first-quarter of 2026 compared with $50.6 million in the prior year quarter. Adjusted net income for the first-quarter of 2026 was $62.9 million as compared with $55.2 million in the prior year quarter.

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First Quarter 2026: Andersen delivered a strong first quarter, driven by demand across core services, with consistent revenue growth in the Tax practice and accelerating momentum in Andersen Consulting.

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First-Quarter 2026 Revenue: $240.7 million, up 15.7% compared with $208.1 million in first-quarter

2025.

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First-Quarter 2026 Earnings per share (EPS) basic were $0.04 and EPS diluted were $0.03.

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Second-Quarter 2026 Guidance: Revenue expected to be in the range of approximately $190 million to

$205 million, equating to a growth rate of approximately 13%, with a projected net loss and negative EPS due to seasonality.

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Updated 2026 Full-Year Guidance: Revenue expected to be in the range of approximately $980 million to $1 billion, equating to a growth rate of approximately 18%, including inorganic revenue of approximately $55 million; Adjusted EBITDA projected in the range of approximately $225 million to $250 million with Adjusted EBITDA margins in the range of approximately 23% to 25%.

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Strategic Investment Focus: 2026 will reflect continued investment in talent, technology, automation, AI, and integration of firms to be acquired during the year, resulting in an anticipated positive net income and EPS for the full year.

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Long-Term Growth: Positioned for sustained revenue growth and expanding margins,

supported by a large addressable market, strong competitive positioning, scalable operating model, and selective inorganic expansion.

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Commitment to Shareholder Value: Maintaining flexibility to deploy capital strategically to strengthen and expand the multi-dimensional platform, and enhance long-term shareholder value.

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Mark L. Vorsatz, Global Chairman and CEO of Andersen, said:

“Our first-quarter results reflect the strength of our platform and the momentum across the business,” said Mark Vorsatz, Global Chairman and CEO of Andersen. “We are generating consistent, organic growth throughout all service lines, supported by our integrated global platform and our ability to deliver coordinated, cross-border solutions.”

Recent Developments—Inorganic Growth Opportunities

Andersen’s relationships with over 400 Andersen Global and Andersen Consulting member and collaborating firms provide opportunities for domestic and international expansion through closer partnerships and, future acquisitions and business combinations. In May 2026, the Company announced it closed the acquisition of tax firms in Ireland and New Zealand, a tax firm and a consulting firm in Nigeria, and a tax firm and a law firm in Uruguay, expanding its presence across key developed and high-growth markets as it continues to scale its global platform. In addition, Andersen signed agreements for the acquisition of a tax firm in Switzerland and a business combination in Canada, both expected to close in the third quarter of 2026.

Key Financial and Operational Metrics

We monitor the following key financial and business metrics to evaluate our business, measure our performance and make strategic decisions:

Three Months Ended March 31,

2026

2025

Revenue:

Revenue (in thousands)

$ 240,746

$ 208,067

Clients:

Client groups

10,870

10,500

Client engagements

18,970

18,600

People Metrics:

Employees

2,271

2,209

Components of Revenue

We generate our revenue from providing tax and financial advisory services to our clients. During the three months ended March 31, 2026 and 2025, the substantial majority of our revenue was generated on a time and materials basis and, to a lesser extent, on a fixed fee basis and contingent fee basis. In the future, our revenue and profitability could vary materially depending on changes in the nature of services provided, as well as the stage of performance at which the right to receive fees is finally determined. We provide services in four primary areas:

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Private Client Services. We provide comprehensive ta

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Exhibit 99.1

Andersen Reports Record Fourth-Quarter and Full-Year 2025 Financial Results and Initiates 2026 Guidance

San Francisco, Mar. 17, 2026 — Andersen Group Inc. (NYSE: ANDG) today released financial results for the fourth quarter and full year ended December 31, 2025.

Andersen delivered strong top-line growth in 2025, with full-year revenue of

$838.7 million, up 14.6% from $731.6 million in 2024. Fourth-quarter revenue of $170.3 million grew 19.6% year-over-year, compared with $142.4 million in the prior year period. Revenue growth was broad-based across all service lines, driven by customer additions, higher volume, and service line expansion. No large one-time items contributed to 2025 revenue. Total inorganic revenue for full-year 2025 amounted to approximately $1.0 million. Expenses related to the initial public offering, including equity restructuring costs and certain components of equity-based compensation led to a (net loss) for full-year 2025 of ($130.2) compared with net income of $134.8 million in 2024. Adjusted net income for the full-year 2025 was $217.0 million as compared with $136.4 million in 2024.

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Record Fourth Quarter: Andersen delivered a robust fourth quarter, driven by strong demand across core services, with consistent growth in the Tax practice and accelerating momentum in Consulting and Global Mobility.

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Fourth-Quarter 2025 Revenue: $170.3 million, up 19.6% compared with $142.4 million in fourth-quarter

2024.

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Full-Year 2025 Revenue: $838.7 million, up 14.6% compared with $731.6 million in prior year.

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2026 Guidance: Revenue expected to be approximately $955 million to $970 million, a growth rate of approximately 14% to 15%, including inorganic revenue of approximately $33 million; Adjusted EBITDA projected at $213 million to $220 million with margins of approximately 22% to 23%.

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Strategic Investment Focus: 2026 will reflect continued investment in talent, technology, automation, AI, and integration of firms to be acquired during the year, resulting in an anticipated net loss and negative EPS for the full year.

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Long-Term Growth: Positioned for sustained revenue growth and expanding margins, supported

by a large addressable market, strong competitive positioning, scalable operating model, and selective inorganic expansion.

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Commitment to Shareholder Value: Maintaining flexibility to deploy capital strategically to strengthen and expand the multi-dimensional platform, and enhance long-term shareholder value.

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Mark L. Vorsatz, Global Chairman and CEO of Andersen, said:

“Our fourth quarter capped a record year for the firm, and underscores the strength of our global, multi-dimensional platform and the continued demand for high-value advisory services. We are entering 2026 with strong momentum, and a clear focus on disciplined growth – investing in the expansion of our platform, integrating high-quality firms across key markets, and deploying technology, automation and AI to enhance efficiency and scale our services. These investments position us to further strengthen our market leadership while driving sustained revenue growth and increased profitability over time.”

Initial Public Offering

On December 18, 2025, we completed our initial public offering (IPO) of 12,650,000 shares of Class A common stock at an offering price of $16.00 per share, including 1,650,000 shares of Class A common stock issued pursuant to the underwriters’ over-allotment option. We received net proceeds of $188.2 million, net of underwriting discounts and commissions of $14.2 million, but before deducting offering costs of $9.9 million.

Key Financial and Operational Metrics

We monitor the following key financial and business metrics to evaluate our business, measure our performance and make strategic decisions:

Year Ended December 31,

2025 (Unaudited)

2024

2023

Revenue:

Revenue (in thousands)

$ 838,692

$ 731,593

$ 639,111

Clients:

Client groups

12,350

11,700

10,700

Client engagements

22,450

20,300

17,900

Client groups with minimum annual revenue over $250,000

687

629

524

Percentage of revenue from top 10 client groups

5.5 %

5.0 %

5.3 %

People Metrics:

Employees

2,296

2,187

2,082

Attrition rate

14.2 %

14.1 %

11.0 %

Revenue Components

We generate our revenue from providing tax and financial advisory services to our clients. During 2025, 2024, and 2023, the substantial majority of our revenue was generated on a time and materials basis and, to a lesser extent, on a fixed fee basis and contingent fee basis. In the future, our revenue and profitability could vary materially depending on changes in the nature of services provided, as well as the stage of performance at which the right to receive fees is finally determined. We provide services in four primary areas:

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Private Client Services. We provide comprehensive tax and financial services for individuals and families, addressing complex clien