All three major indices are trading up today with the Dow Jones Industrial Average ( ^DJI) trading up 93 points (0.5%) at 17,310 as of Wednesday, Oct. 21, 2015, 12:55 PM ET. The NYSE advances/declines ratio sits at 1,382 issues advancing vs. 1,596 declining with 151 unchanged.

The Technology sector currently sits down 0.3% versus the S&P 500, which is up 0.2%. On the negative front, top decliners within the sector include VMWare ( VMW), down 20.1%, Amphenol ( APH), down 4.4%, Nielsen Holdings ( NLSN), down 4.3%, Salesforce.com ( CRM), down 1.6% and America Movil SAB de CV ( AMX), down 1.4%. Top gainers within the sector include KLA-Tencor ( KLAC), up 22.5%, Lam Research ( LRCX), up 6.5%, Kyocera ( KYO), up 3.8%, Analog Devices ( ADI), up 3.5% and ASML ( ASML), up 2.1%.

TheStreet would like to highlight 3 stocks pushing the sector lower today:

3. Palo Alto Networks ( PANW) is one of the companies pushing the Technology sector lower today. As of noon trading, Palo Alto Networks is down $6.76 (-4.1%) to $159.30 on average volume. Thus far, 1.1 million shares of Palo Alto Networks exchanged hands as compared to its average daily volume of 1.6 million shares. The stock has ranged in price between $158.03-$167.53 after having opened the day at $167.48 as compared to the previous trading day's close of $166.06.

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Palo Alto Networks, Inc. provides enterprise security platform to enterprises, service providers, and government entities worldwide. Palo Alto Networks has a market cap of $14.3 billion and is part of the computer hardware industry. Shares are up 35.5% year-to-date as of the close of trading on Tuesday. Currently there are 20 analysts that rate Palo Alto Networks a buy, no analysts rate it a sell, and 6 rate it a hold.

TheStreet Ratings rates Palo Alto Networks as a sell. Among the areas we feel are negative, one of the most important has been unimpressive growth in net income over time. Get the full Palo Alto Networks Ratings Report now.

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2. As of noon trading, Yahoo ( YHOO) is down $1.31 (-4.0%) to $31.52 on heavy volume. Thus far, 15.6 million shares of Yahoo exchanged hands as compared to its average daily volume of 16.8 million shares. The stock has ranged in price between $31.23-$32.43 after having opened the day at $32.06 as compared to the previous trading day's close of $32.83.

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Yahoo! Inc. provides search and display advertising services on Yahoo properties and affiliate sites worldwide. Yahoo has a market cap of $31.5 billion and is part of the internet industry. Shares are down 35.0% year-to-date as of the close of trading on Tuesday. Currently there are 20 analysts that rate Yahoo a buy, no analysts rate it a sell, and 6 rate it a hold.

TheStreet Ratings rates Yahoo as a hold. The company's strengths can be seen in multiple areas, such as its revenue growth, largely solid financial position with reasonable debt levels by most measures and notable return on equity. However, as a counter to these strengths, we also find weaknesses including unimpressive growth in net income, weak operating cash flow and a generally disappointing performance in the stock itself. Get the full Yahoo Ratings Report now.

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1. As of noon trading, EMC ( EMC) is down $1.35 (-4.9%) to $26.14 on heavy volume. Thus far, 33.1 million shares of EMC exchanged hands as compared to its average daily volume of 21.0 million shares. The stock has ranged in price between $26.00-$26.40 after having opened the day at $26.33 as compared to the previous trading day's close of $27.49.

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EMC Corporation develops, delivers, and supports information infrastructure and virtual infrastructure technologies, solutions, and services. EMC has a market cap of $53.4 billion and is part of the computer hardware industry. Shares are down 7.6% year-to-date as of the close of trading on Tuesday. Currently there are 13 analysts that rate EMC a buy, 1 analyst rates it a sell, and 11 rate it a hold.

TheStreet Ratings rates EMC as a hold. The company's strengths can be seen in multiple areas, such as its revenue growth, largely solid financial position with reasonable debt levels by most measures and expanding profit margins. However, as a counter to these strengths, we also find weaknesses including deteriorating net income, weak operating cash flow and relatively poor performance when compared with the S&P 500 during the past year. Get the full EMC Ratings Report now.

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If you are interested in one of these 3 stocks, ETFs may be of interest. Investors who are bullish on the technology sector could consider Technology Select Sector SPDR ( XLK) while those bearish on the technology sector could consider ProShares Ultra Short Technology ( REW).