Baker Brothers probably bought more shares because:
Ownership of human genes isn't what they are investing in. They are investing in a company that provides a very valuable service and does a good job at it. New companies will pop up but the company with the best technology is what doctors and patients will want. Especially when their life is on the line.
He is the description of what Genomic Health does and this is clearly what many are investing in:
"Genomic Health, Inc., a healthcare company, provides actionable genomic information to personalize cancer treatment decisions. It develops and commercializes genomic-based clinical laboratory services that analyze the underlying biology of cancer, allowing physicians and patients to make individualized treatment decisions. The company provides the Oncotype DX invasive breast cancer test that is used for early stage invasive breast cancer patients to predict the likelihood of breast cancer recurrence and the likelihood of chemotherapy benefit. It also offers the Oncotype DX colon cancer test, which is used to predict the likelihood of colon cancer recurrence in patients with stage II disease, as well as for use in patients with stage III disease treated with oxaliplatin-containing adjuvant therapy. In addition, the company provides the Oncotype DX tests for patients with ductal carcinoma in situ, a pre-invasive form of breast cancer."
Ownership of human genes isn't part of that def, right?
Shorts will always take information and try to make it look like the beginning of the end for great companies. That is partly how they make their money; by lying and deceiving they destroy confidence (easier to do than to build up).
When the market offers you a pullback it will be an opportunity for both long and shorts. Shorts get a chance to cover positions their created at a higher price and new investors get an opportunity to buy in at a better price. It is a win win for everyone except for the few who want to sell right now; they may need to sell low or even take a loss if they want out of their position.
Shake that tree enough and the buyers will return… Goodbye weak hands
Competition is not something to be feared but managed. In this case GHDX has an established base within the oncology community of physicians. Even if a competitor develops a product, it will have to be superior to GHDX or there is no reason for a doctor to choose to use it. Second, you have to do more than develop a product, it has to be sold. GHDX has a substantial investment in a marketing infrastructure, and no new entrant competitor will have that for some time. In other words, relax, it is ok to be in a race when you start out way ahead.