This Was the Best Performing Healthcare ETF Last Week

Source: TBIT ON PIXABAY.

It was a terrific week to have money invested in the healthcare sector, as the majority of the largest exchange-traded funds that focus on the space smashed the returns of the S&P 500. Several of these ETFs gained more than 2% during the trading week, but that was nothing compared with the top-performing fund -- thePowerShares Dynamic Pharmaceuticals ETF, which roared 3.7% higher during the period.

So let's take a closer look at this ETF to figure out why it outperformed this week.

PJP key statistics

Inception Year	2005
Number of Holdings	23
Net Assets	$1,227 million
Average P/E Ratio	27.12
Yield	0.56%
Expense Ratio	0.56%

DATA SOURCE: INVESCO.

As it name suggests, the PowerShares Dynamic Pharmaceuticals ETF invests the bulk of itsassets in pharmaceutical companies. PJP is also quite concentrated, holding a position in only 23 companies.

While that may worry some investors, the fund does keep its assets in the biggest players in the space, which helps keep the fund's overall risk profile down. In fact, the average market cap held in this fund right now is a whopping $70 billion.

Here's a look at the fund's top 10.

Company	Symbol	% Assets
Gilead Sciences	GILD	5.36%
Bristol-Myers Squibb	BMY	5.26%
Merck & Co.	MRK	5.19%
Amgen	AMGN	5.12%
Pfizer	PFE	5.10%
Johnson & Johnson	JNJ	4.97%
Ligand Pharmaceuticals	LGND	4.96%
Eli Lilly & Co.	LLY	4.90%
Heron Therapeutics	HRTX	4.59%
Novavax	NVAX	4.41%

DATA SOURCE: INVESCO.

What worked this week?While every single one of this fund's top holdings finished the week in the green, the entire fund was pulled up by the outperformance of one stock -- Heron Therapeutics .

Heron Therapeutics stock rocketed higher this week after the company announced that there are no longer any remaining substantive deficiencies in its New Drug Application for Sustol, its drug that's awaiting approval forchemotherapy-induced nausea and vomiting, or CINV.

That news probably relieved many of Heron's investors, since the approval process for Sustol has been much more arduous than many had hoped for. The FDA has already rejected the drug twice, and the agency has extended its review of the drug. The troubles have weighed greatly on Heron's stock over the past few quarters, so traders reacted favorably to the good news. The company is currently in discussions with the FDA about the drug's labeling.

Some analysts are projecting that Sustol's peak sales could reach $400 million, but that estimate assumes that the drug's labeling is not overly restrictive. If the agency decides to greatly restrict the addressable market for Sustol, then that estimate could fall rapidly.

What'snext for PJP?This is the third time this year PJP has claimed the title of best-performing weekly healthcare ETF, which hints that the fund has found a winning strategy. Given that it provides investors with instant diversity at a modest cost, I think this could be a great choice for anyone who wants a little bit more healthcare exposure in his or her portfolio.

The article This Was the Best Performing Healthcare ETF Last Week originally appeared on Fool.com.

Brian Feroldi owns shares of Gilead Sciences. The Motley Fool owns shares of and recommends Gilead Sciences and Johnson & Johnson. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.