ARCTMEDIUM SIGNALOPERATIONAL10-K

ARCT shifted strategic focus from infectious disease vaccines to rare diseases while experiencing significant revenue decline and operational challenges despite improved cost management.

The company appears to be transitioning away from its COVID vaccine commercialization phase toward a more focused rare disease pipeline, evidenced by the removal of commercial milestone language and emphasis on OTC deficiency and cystic fibrosis programs. While this strategic pivot may position ARCT for long-term growth in higher-value rare disease markets, the significant revenue decline and worsening cash burn raise questions about execution and funding sustainability during this transition period.

Comparing 2026-03-03 vs 2025-03-06View on EDGAR →
FINANCIAL ANALYSIS

ARCT's financials reflect a challenging transition year with revenue declining 46% to $82M and operating cash flow worsening by 24% to -$74.3M outflow, suggesting reduced COVID vaccine royalties and increased operational challenges. However, the company demonstrated strong cost discipline with R&D expenses cut 43% to $112.2M and total liabilities reduced 45% to $57.2M, resulting in improved operating losses despite lower revenues. The overall picture suggests ARCT is rightsizing its cost structure while navigating a strategic shift from commercial COVID vaccine revenues to rare disease development, though the worsening cash burn remains a key monitoring point for sustainability.

FINANCIAL STATEMENT CHANGES
Capital Expenditure
Cash Flow
-64.5%
$648K$230K

Capex reduced 64.5% — investment cycle winding down or capital discipline; may improve near-term free cash flow.

Revenue
P&L
-46.1%
$152.3M$82.0M

Revenue declined 46.1% — significant demand weakness or market share loss warrants investigation.

Total Liabilities
Balance Sheet
-44.6%
$103.1M$57.2M

Liabilities reduced 44.6% — deleveraging improves balance sheet strength and financial flexibility.

Current Liabilities
Balance Sheet
-44.5%
$65.5M$36.4M

Current liabilities reduced — improved short-term financial position and working capital health.

R&D Expense
P&L
-42.5%
$195.2M$112.2M

R&D spending cut 42.5% — could signal cost discipline or concerning reduction in innovation investment.

Accounts Receivable
Balance Sheet
+40%
$4.0M$5.6M

Receivables surged 40% — revenue recognized but not yet collected; watch for collection issues or channel stuffing.

Operating Cash Flow
Cash Flow
-24.3%
-$59.7M-$74.3M

Operating cash flow softened — monitor whether temporary working capital timing or structural deterioration.

Total Assets
Balance Sheet
-21.2%
$344.1M$271.1M

Total assets contracted 21.2% — asset sales, write-downs, or balance sheet optimization underway.

Current Assets
Balance Sheet
-21.1%
$306.0M$241.4M

Current assets declined 21.1% — monitor working capital adequacy and short-term liquidity.

Operating Income
P&L
+20.3%
-$95.7M-$76.3M

Operating income improving — cost discipline or growing revenue base absorbing fixed costs.

LANGUAGE CHANGES
NEW — 2026-03-03
PRIOR — 2025-03-06
ADDED
As of February 27, 2026, the registrant ha d 28,423,069 share s of voting common stock outstanding.
This Annual Report on Form 10-K includes references to and citations of third-party publications.
Such publications and related materials are provided for informational purposes only.
Business Overview We are a messenger RNA medicines company focused on the development of liver and respiratory rare disease therapeutics.
We have ongoing Phase 2 clinical studies for our RNA therapeutic candidates to potentially treat ornithine transcarbamylase (OTC) deficiency and cystic fibrosis (CF).
We developed the world s first approved self-amplifying messenger RNA (sa-mRNA) vaccine, KOSTAIVE ( KOSTAIVE ), which we have partnered with Seqirus, Inc.
KOSTAIVE has achieved approval in Japan, the European Union and the United Kingdom as a vaccine against COVID-19, and sales of KOSTAIVE began in Japan in October 2024.
In our vaccine program, we have partnered with CSL Seqirus, one of the world s leading influenza vaccine providers, on the development and commercialization of mRNA vaccines for COVID-19, influenza and three other infectious diseases.
In CSL Limited s half-year results presented on February 11, 2026, CSL Limited reported an accounting write-down of approximately $430 million attributable to our collaboration agreement with CSL Seqirus, citing declining COVID-19 disease burden and more onerous U.S.
In our CF program, we enrolled and completed dosing in the three initially planned cohorts of our Phase 2 multiple ascending dose study of ARCT-032, confirming the safety and tolerability of ARCT-032 dosed daily for four weeks.
REMOVED
As of March 4, 2025, the registrant ha d 27,119,823 s hares of voting common stock outstanding.
Such statements may include, but are not limited to, statements concerning the following: our compliance, and ability to remain in compliance, with the requirements of our collaboration agreements, including our collaboration with Seqirus Inc.
Business Overview We are a messenger RNA medicines company focused on the development of infectious disease vaccines and opportunities within liver and respiratory rare diseases.
We developed the world s first approved self-amplifying messenger RNA (sa-mRNA) vaccine, KOSTAIVE ( KOSTAIVE ).
KOSTAIVE achieved approval in Japan in 2023 as a vaccine against COVID-19.
Sales of KOSTAIVE began in Japan in October 2024, marking our transition to a commercial stage company.
The approval of KOSTAIVE in Japan was a significant milestone which validates our LUNAR and STARR platforms, as well as sa-mRNA more generally as a meaningful modality.
( CSL Seqirus ), a part of CSL Limited and one of the world s leading influenza vaccine providers, on the development and commercialization of mRNA vaccines for COVID-19, influenza and certain other infectious diseases.
Commercial sales of KOSTAIVE began in October 2024 in Japan by Meiji Seika Pharma ( Meiji ), CSL Seqirus exclusive partner in Japan, marking the first commercial sales of an Arcturus-developed product.
In February 2025, we received approval of KOSTAIVE from the European Commission (EC), which provided further validation of our platform by another significant regulatory authority.
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