Equities continue their climb, notching gains of 15.7% so far this year, as measured by the S&P 500. This comes after a 13% gain last year. Against that backdrop, we asked Morningstar to rank the top mutual funds in the U.S. for the past 12 months. We limited it to open-end funds that have at least $100 million in assets and that have been in business for at least five years. 

10. Fidelity Select Biotechnology
12-month return: 56.40%
Ticker: FBIOX
Morningstar category: Health
60-month return: 19.20%
Total assets: $5.2 billion

9. Pacific Advisors Small Cap Value A
12-month return: 56.46%
Ticker: PASMX
Morningstar category: Small Blend
60-month return: 9.11%
Total assets: $146.7 million 

8. Oberweis China Opportunities
12-month return: 58.49%
Ticker: OBCHX
Morningstar category: China Region
60-month return: 7.54%
Total assets: $135.4 million 

7. Fidelity Japan Smaller Companies
12-month return: 59.95%
Ticker: FJSCX
Morningstar category: Japan Stock
60-month return: 8.86%
Total assets: $512.7 million

6. Rydex S&P 500 2x Strategy H
12-month return: 60.24%
Ticker: RYTNX
Morningstar category: Large blend
60-month return: 7.09%
Total assets: $142 million 

5. Bridgeway Ultra-Small Company
12-month return: 63.75%
Ticker: BRUSX
Morningstar category: Small value
60-month return: 11.8%
Total assets: $143.9 million 

4. Fidelity Select Automotive
12-month return: 72.16%
Ticker: FSAVX 
Morningstar category: Consumer cyclical
60-month return: 14.87%
Total assets: $187 million

3. Legg Mason Opportunity C
12-month return: 78.53%
Ticker: LMOPX
Morningstar category: Mid-cap value
60-month return: 4.85%
Total assets: $1.4 billion

2. Rydex Russell 2000 2x Strategy A
12-month return: 85.13%
Ticker: RYRUX
Morningstar category: Small blend
60-month return: 6.14%
Total assets: $102.2 million

1. ProFunds Biotechnology UltraSector Inv
12-month return: 108.37%
Ticker: BIPIX
Morningstar category: Health
60-month return: 21.65%
Total assets: $254 million 

Source: Morningstar