ONE LEVEL DEEPER
INSM
Warren Buffett frameworkThe Owner-OperatorBenjamin Graham frameworkThe Value ArchitectMichael Mauboussin frameworkThe Expectations EngineerHoward Marks frameworkThe Cycle WhispererPeter Lynch frameworkThe Everyday Edge

Insmed's 82.5% gross margins cannot overcome -$248M quarterly cash burn, creating a rare disease specialist that destroys capital at premium prices.

cautiousLeaning Bearishconviction

This framework sees a rare disease specialist with exceptional gross margins burning cash at unsustainable rates while the market prices in a transformation that may never arrive.

THE LENSES
OWNER EARNINGSalarming

Would an owner of this business be able to take home real cash after maintaining operations?

Operating cash flow of -$248M in Q4'25 despite revenue of $264M
Free cash flow deeply negative at -$248M with minimal capex needs
Stock-based compensation dropped to 0% in Q4'25 from historical 25% of revenue
Net income of -$328M in Q4'25 shows accounting losses exceed cash burn
Cash conversion remains negative despite 85.4% revenue growth YoY

This framework finds deeply troubling cash economics. Despite explosive revenue growth and the elimination of stock dilution, the business consumes $248M quarterly with no path to positive owner earnings visible. An owner would need to continuously inject capital rather than extract it.

Owner Earnings vs Reported EPS
THE MOATincomplete

Does this business have durable competitive advantages that protect its economics?

Gross margins of 82.5% in Q4'25, up from 74.9% in Q4'24
Revenue concentration at 100% in single reportable segment for rare diseases
Two approved products: ARIKAYCE and newly launched BRINSUPRI
Operating margin remains deeply negative at -124.5% despite pricing power

The framework recognizes exceptional pricing power in rare disease markets, evidenced by 82.5% gross margins at the 93rd percentile historically. However, the inability to translate this pricing advantage into positive operating margins suggests the moat protects price but not profitability.

Gross Margin
THE OWNER'S MATHirrational

If you bought this entire business today, would what it earns justify what you paid?

Trading at $162.43 versus DCF value of -$148, a 209.7% premium
Earnings yield of -0.88% versus treasury yield of 4.33%
P/E ratio of -28.3x at 0th percentile of 10-year range
Market capitalization implies earning power that does not exist in the data

Applying this framework's permanent owner mindset, the math is indefensible. A business losing $1.28B annually trading at a 209.7% premium to its already negative DCF value represents speculation, not investment. The -5.21% spread to treasuries means an owner pays to lose money.

Earnings Yield
MANAGEMENT AS STEWARDSconcerning

Are managers acting as owners or agents?

Insiders sold 1,009,481 shares over 4 quarters, approximately $150M
Seven consecutive quarters of insider selling with 0.20 sell ratio in Q4'25
CEO compensation of $14.5M in 2026 primarily in stock despite losses
No buybacks or dividends while burning $248M quarterly
Debt reduced from $1.31B to $768M showing some capital discipline

This framework finds troubling stewardship signals. Management's persistent selling while the company burns cash and trades at extreme valuations suggests they view their own equity as overvalued. The debt reduction provides modest comfort but cannot offset the insider exodus.

Insider Net Buying/Selling
KEY NUMBERS
VERDICT

This framework sees a business with undeniable pricing power in rare diseases that cannot translate that advantage into owner earnings. The 82.5% gross margins prove the products have value, but the -$248M quarterly cash burn proves the business model does not. When insiders flee while institutions pile in at a 209.7% premium to negative fair value, someone misunderstands this business fundamentally. Is it possible to build a great business that never makes money?

This analysis applies Warren Buffett's published investment framework to publicly available financial data. It is not authored by, endorsed by, or affiliated with Warren Buffett. Educational purposes only. Not financial advice.

OTHER PERSPECTIVES
Peter Lynch framework
The Everyday Edge
Leaning Bearish
Michael Mauboussin framework
The Expectations Engineer
Bearish
Howard Marks framework
The Cycle Whisperer
Bearish
Benjamin Graham framework
The Value Architect
Bearish
Explore
Broadcom Inc.AVGOPalo Alto Networks, Inc.PANWStrategy IncMSTRCadence Design Systems, Inc.CDNSTake-Two Interactive Software, Inc.TTWOCoStar Group, Inc.CSGP
EDUCATIONAL ONLY · NOT FINANCIAL ADVICEv2