Sifting through countless of stocks in the Biotechnology industry can be tedious, and sometimes two stocks are just too similar to judge which is the better investment. If you’re on the fence about investing in Exelixis, Inc. or Xenon Pharmaceuticals Inc. because you’re not sure how they measure up, it’s important to compare them on a few factors before making your decision.

Read on to learn how Exelixis, Inc. and Xenon Pharmaceuticals Inc. compare based on key financial metrics to determine which better meets your investment needs.

About Exelixis, Inc. and Xenon Pharmaceuticals Inc.

Exelixis, Inc., an oncology company, focuses on the discovery, development, and commercialization of new medicines for difficult-to-treat cancers in the United States. The company offers CABOMETYX tablets for the treatment of patients with advanced renal cell carcinoma who received prior anti-angiogenic therapy; and COMETRIQ capsules for the treatment of progressive and metastatic medullary thyroid cancer. Its CABOMETYX and COMETRIQ are derived from cabozantinib, an inhibitor of multiple tyrosine kinases, including MET, AXL, RET, and VEGF receptors. The company also offers COTELLIC, an inhibitor of MEK as a combination regimen to treat specific forms of advanced melanoma; and MINNEBRO, an oral non-steroidal selective blocker of the mineralocorticoid receptor for the treatment of hypertension in Japan. It develops zanzalintinib, a novel, potent oral inhibitor of kinases, including the TAM kinases, MET, and VEGF receptors; XL309, a small molecule inhibitor of USP1, a synthetic lethal target in the context of BRCA-mutated tumors; XB010, an antibody-drug conjugates (ADC) consisting of a MMAE payload conjugated to a monoclonal antibody targeting the tumor antigen 5T4; XB628, a first-in-class bispecific antibody that targets programmed cell death ligand 1and natural killer cell receptor group 2A; and XB371, a next-generation tissue factor targeting ADC with a topoisomerase inhibitor payload. It has research collaborations and license agreements with Ipsen Pharma SAS; Takeda Pharmaceutical Company Ltd.; F. Hoffmann-La Roche Ltd.; Catalent, Inc.; Iconic Therapeutics, Inc.; Adagene Inc.; Invenra, Inc.; Genentech, Inc.; Bristol-Myers Squibb Company; and Daiichi Sankyo Company, Limited, as well as business development activities and other collaborations. The company was formerly known as Exelixis Pharmaceuticals, Inc. and changed its name to Exelixis, Inc. in February 2000. Exelixis, Inc. was incorporated in 1994 and is headquartered in Alameda, California.

Xenon Pharmaceuticals Inc., a neuroscience-focused biopharmaceutical company, engages in the discovery, development, and delivery of therapeutics to treat patients with neurological and psychiatric disorders. Its product candidates include Azetukalner, a novel, potent Kv7 potassium channel opener which is in Phase 3 clinical development for the treatment of epilepsy, including focal onset seizures, and primary generalized tonic-clonic seizures, as well as neuropsychiatric disorders, such as major depressive disorder and bipolar depression. In addition, the company’s Phase 1 Single Ascending Dose/Multiple Ascending Dose products include XEN1701 targeting the sodium channel and XEN1120 targeting the Kv7 potassium channel for the treatment of pain. The company has a license and collaboration agreement with Neurocrine Biosciences, Inc. for the development of NBI-921355, a Nav1.2/1.6 sodium channel inhibitor that is in Phase 1 clinical trials for the treatment of certain types of epilepsy. Xenon Pharmaceuticals Inc. was incorporated in 1996 and is headquartered in Burnaby, Canada.

Latest Biotechnology and Exelixis, Inc., Xenon Pharmaceuticals Inc. Stock News

As of September 4, 2026, Exelixis, Inc. had a $14.6 billion market capitalization, compared to the Biotechnology median of $282.4 million. Exelixis, Inc.’s stock is up 34.6% in 2026, up 8.4% in the previous five trading days and up 57.87% in the past year.

Currently, Exelixis, Inc.’s price-earnings ratio is 18.5. Exelixis, Inc.’s trailing 12-month revenue is $2.4 billion with a 35.3% net profit margin. Year-over-year quarterly sales growth most recently was 10.6%. Analysts expect adjusted earnings to reach $3.582 per share for the current fiscal year. Exelixis, Inc. does not currently pay a dividend.

As of September 4, 2026, Xenon Pharmaceuticals Inc. had a $5.8 billion market cap, putting it in the 69th percentile of all stocks. Xenon Pharmaceuticals Inc.’s stock is up 33.3% in 2026, down 0.4% in the previous five trading days and up 54.63% in the past year.

Currently, Xenon Pharmaceuticals Inc. does not have a price-earnings ratio. Xenon Pharmaceuticals Inc.’s trailing 12-month revenue is $0.0 million with a % net profit margin. As of September 4, 2026, Xenon Pharmaceuticals Inc. has not reported significant year-over-year quarterly sales. Analysts expect adjusted earnings to reach $-4.633 per share for the current fiscal year. Xenon Pharmaceuticals Inc. does not currently pay a dividend.

How We Compare Exelixis, Inc. and Xenon Pharmaceuticals Inc. Stock Grades

Stock evaluation requires access to huge amounts of data and the knowledge and time to sift through it all, make sense of financial ratios, read income statements and analyze recent stock movements. AAII created A+ Investor, a robust data suite that condenses data research in an actionable and customizable way suitable for investors of all knowledge levels, to help investors streamline and work through such data.

AAII’s proprietary stock grades come with A+ Investor. These offer intuitive A‐F grades for each of five key investing factors: value, growth, momentum, earnings estimate revisions and quality. Here, we’ll take a closer look at Exelixis, Inc. and Xenon Pharmaceuticals Inc.’s stock grades to see how they measure up against one another.

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Exelixis, Inc. and Xenon Pharmaceuticals Inc. Stock Value Grades

Company	Ticker	Value
Exelixis, Inc.	EXEL	C
Xenon Pharmaceuticals Inc.	XENE	na

Successful stock investing involves buying low and selling high, so stock valuation is an important consideration for stock selection.

Buying stocks that are going to go up typically means buying stocks that are undervalued in the first place, although momentum investors may argue that point.

AAII’s A+ Investor Value Grade derives from a stock’s value score. The Value Score is the percentile rank of the average of the percentile ranks of the price-to-sales ratio, price-earnings ratio, enterprise-value-to-EBITDA (EV/EBITDA) ratio, shareholder yield, price-to-book-value ratio and price-to-free-cash-flow ratio. The score is variable, meaning it can consider all six ratios or, should any of the six ratios not be valid, the remaining ratios that are valid. To be assigned a Value Score, stocks must have a valid (non-null) ratio and corresponding ranking for at least two of the six valuation ratios.

Stocks with a Value Score from 81 to 100 are considered deep value, those with a score between 61 and 80 are a good value and so on.

Exelixis, Inc. has a Value Score of 46, which is Average. Xenon Pharmaceuticals Inc. does not have a meaningful Value Score.

The Value Stock Winner: No Clear Winner

Neither Exelixis, Inc. or Xenon Pharmaceuticals Inc. has a high enough value grade to be considered a “winner.” Investors who are considering these companies should do additional due diligence and research to see if either could be a good addition to their portfolio. It’s important to look at a wide range of financial metrics in order to determine if Exelixis, Inc. or Xenon Pharmaceuticals Inc. is the better investment when it comes to value.

Exelixis, Inc. and Xenon Pharmaceuticals Inc.’s Quality Grades

Company	Ticker	Quality
Exelixis, Inc.	EXEL	A
Xenon Pharmaceuticals Inc.	XENE	D

Like the Value Grade, AAII’s A+ Investor Quality Grade comes from the percentile rank of key metrics. Specifically, the Quality Score is the percentile rank of the average of the percentile ranks of return on assets (ROA), return on invested capital (ROIC), gross profit relative to assets, buyback yield, change in total liabilities to assets, accruals, Z double prime bankruptcy risk (Z) score and the F-Score.

The score is variable, meaning it can consider all eight measures or, should any of the eight measures not be valid, the remaining measures that are valid. To be assigned a Quality Score, stocks must have a valid (non-null) measure and corresponding ranking for at least four of the eight quality measures.

The Quality Score is used to assess the underlying “quality” of a particular stock. A higher-quality stock possesses traits associated with upside potential and reduced downside risk. Backtesting of the Quality Grade shows that stocks with higher grades, on average, outperformed stocks with lower grades over the period of 1998 through 2019.

Stocks receive better grades (higher scores) for having higher scores for the quality subcomponents and worse grades (lower scores) for lower scores for the subcomponents.

Exelixis, Inc. has a Quality Score of 99, which is Very Strong. Xenon Pharmaceuticals Inc. has a Quality Score of 27, which is Weak.

The Quality Grade Winner: Exelixis, Inc.

As you can clearly see from the Quality Grade breakdown above, Exelixis, Inc. has a better overall quality grade than Xenon Pharmaceuticals Inc.. For investors who are looking for companies with higher quality than others in the same industry, Exelixis, Inc. could be a good stock to add to their portfolios. However, it’s important for investors to analyze multiple factors based on a wide range of metrics before deciding whether to buy.

Exelixis, Inc. and Xenon Pharmaceuticals Inc.’s Estimate Revisions Grades

Company	Ticker	Earnings Estimate
Exelixis, Inc.	EXEL	C
Xenon Pharmaceuticals Inc.	XENE	C

Earnings estimate revisions scores consider the magnitude of a company’s earnings surprise in its last two reported fiscal quarters. Often, positive surprises beget further positive surprises‐or at least continued sales growth (the exact opposite is generally true, too).

Estimate revisions offer an indication of what analysts are thinking about the short-term prospects of a firm. Estimate revisions are based on the statistical significance of a firm’s last two quarterly earnings surprises and the percentage change in its consensus estimate for the current fiscal year over the past month and past three months.

Exelixis, Inc. has a Earnings Estimate Score of 59, which is Neutral. Xenon Pharmaceuticals Inc. has a Earnings Estimate Score of 54, which is Neutral.

The Earnings Estimate Revisions Stock Winner: No Clear Winner

Neither Exelixis, Inc. or Xenon Pharmaceuticals Inc. has an Earnings Estimate Revisions Grade that could be considered a “winner.” Investors considering these companies should do additional due diligence and research to see if either could be a good addition to their portfolios. It’s important to look at a wide range of financial metrics in order to determine if Exelixis, Inc. or Xenon Pharmaceuticals Inc. is the better investment when it comes to estimate revisions.

Other Exelixis, Inc. and Xenon Pharmaceuticals Inc. Grades

In addition to Quality, Estimate Revisions and Value, A+ Investor also provides grades for Growth and Momentum.

Momentum grades help uncover stocks experiencing anomalously high rates of return; research finds that stocks with high relative levels of momentum tend to outperform, whereas those with low levels of momentum tend to continue underperforming.

Growth investing builds on the idea that stocks of companies exhibiting strong, consistent and prolonged growth outperform those of slower-growth companies. AAII measures growth through consistency of annual sales growth, five-year sales growth rankings adjusted for extreme levels, and consistency of positive annual cash from operations.

These 2 key factors, when combined with the above, provide a holistic view into a particular stock. Further, by joining A+ Investor you can see whether Exelixis, Inc. and Xenon Pharmaceuticals Inc. pass any of our 60+ stock screens that have outperformed the market since their creation.

So, Which Is the Better Investment, Exelixis, Inc. or Xenon Pharmaceuticals Inc. Stock?

Overall, Exelixis, Inc. stock has a Value Score of 46, Estimate Revisions Score of 59 and Quality Score of 99.

Xenon Pharmaceuticals Inc. stock has a Value Score of , Estimate Revisions Score of 54 and Quality Score of 27.

Comparing Exelixis, Inc. and Xenon Pharmaceuticals Inc.’s grades, scores and metrics can act as a solid basis to determine whether they may be a good investment or not. You’ll also want to look at your portfolio’s asset allocation as well as your risk tolerance and financial goals to see if either of these stocks would make a good fit for you. AAII can help you figure out which investments align with your individual needs and preferences.

Investors are encouraged to do their own due diligence and research. In this way, individuals can effectively become managers of their own assets‐without having to rely on others for financial independence. You can count on AAII for timeless articles on financial planning and stock-picking, unbiased research and actionable analysis.

A+ Investor adds to our qualitative teaching with a powerful data suite to help you whittle down investment choices to find stocks, exchange-traded funds (ETFs) or mutual funds that meet your needs.

AAII Disclaimer

We make no representations or warranties that any investor will, or is likely to, achieve profits similar to those shown, because past, hypothetical or simulated performance is not necessarily indicative of future results. Before making an investment decision, you should consider your circumstances and whether the information on our content is applicable to your situation. This information was prepared in good faith, and we accept no liability for any errors or omissions. The full disclaimer can be read here.