Hillary Clinton is up in the polls and appears to be staying there. The stocks that could do well under her presidency? Not so much.

The former secretary of state's post-convention bounce appears to have stuck, with a RealClearPolitics average of polls showing her edging out her rival, Donald Trump, by 6.8%. She released her 2015 tax returns last week, upping the pressure on Trump to do so, and delivered an economic speech in Michigan. Newly-released emails drew more questions on the relationship between the State Department and Clinton foundation, but all in all, recent days haven't been half-bad for the former first lady. The same can't be said for her stock portfolio.

The set of 15 stocks that TheStreet has identified could do especially well under a Clinton presidency tumbled last week, falling by 2.18% from market close Friday, August 5 to market close Friday, August 12. That marks a significant change of pace from the week before, when the portfolio dipped just 0.02%. Clinton's portfolio also underperformed Trump's, which declined 0.07%.

There were some bright spots.

Tyson Foods (TSN - Get Report) climbed 2.35%, at market close Friday trading at $75.37. The company posted fiscal third-quarter earnings Monday, reporting adjusted earnings per share of $1.21 and revenue of $9.4 billion, above analysts' estimates. Later in the week it suffered a setback, however, after a video surfaced showing workers injuring chickens. The company announced it would be retraining its employees.

HCA Holdings (HCA - Get Report) ended Friday at $76.64, up 1.09% for the week. The hospital operator last reported earnings in late July, posting adjusted earnings of $1.66 per-share, ahead of analysts' estimates, and $10.32 billion in revenue, behind expectations. Its price is up about 13% year-to-date.

Clinton portfolio companies that also ended the week in the green are Goldman Sachs (GS - Get Report) , Aetna (AET) and Walmart (WMT - Get Report) and well as the SPDR S&P 500 ETF Trust (SPY - Get Report) .

For the rest of the portfolio, last week was tough.

The biggest drag was U.S. Steel (X - Get Report) , which plunged 20.50% to close Friday at $21.06. The Pittsburgh-based company priced an 18.9-million-share stock offering at a discount to its trading price at the time last week, sending the stock downwards. It was also hit with a $170,000 fine after an investigation showed it exposed workers to asbestos hazards, and it announced plans to lay off maintenance workers in Indiana. Despite last week's drop, the stock is still up more than 150% year-to-date.

SolarCity (SCTY) fell 4.40% last week, trading at $23.70 market close Friday. The San Mateo, Calif.-based company announced second quarter results Tuesday and reported downbeat guidance for the third quarter, causing the stock to slide. Earlier this month, SolarCity reached an agreement with Tesla (TSLA - Get Report) to be acquired for $2.6 billion.

Here's how the entire Clinton portfolio did last week, leading with the top gainers:

Tyson Foods 2.35%

HCA Holdings 1.09%

Goldman Sachs 0.74%

Aetna 0.35%

Walmart 0.18%

SPDR S&P 500 ETF Trust 0.11%

Smith & Wesson (SWHC) -0.13%

American Electric Power Company (AEP - Get Report) -0.44%

Netflix (NFLX - Get Report) -0.45%

L-3 Communications (LLL - Get Report) -1.85%

CACI International (CACI - Get Report) -2.18%

Aecom (ACM - Get Report) -3.52%

Renewable Energy Group (REGI - Get Report) -4.05%

SolarCity -4.40%

U.S. Steel -20.50%

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