
Consider shorting OpenDoor Technologies (OPEN), as its positive cash flow is misleadingly generated from selling inventory rather than profitable operations. The company's business model is viewed as fundamentally flawed, with a history of unprofitability even during peak market conditions. Another high-conviction short opportunity is aTyr Pharma (ATYR), based on the expectation that its upcoming Phase 3 clinical trial for sarcoidosis will fail. The scientific basis for ATYR's lead drug is considered weak, with poor results in prior studies. For most investors, it is advisable to avoid the highly speculative biotech sector altogether.

By @realmartinshkreli
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