NEW YORK (TheStreet) -- The Affordable Care Act provided opportunities for several health care insurance providers that took advantage of the mandate that all Americans need health care insurance, which is in focus ahead of open enrollment ending on Feb. 15.

Here are the performance measures and key trading levels for six health care providers that have several things in common. Shares of all six had gains last year and began 2015 setting all-time intraday highs, and all are above all key daily and weekly moving averages with overbought weekly technical momentum.

Let's look at their profiles, followed by the daily and weekly charts for UnitedHealth (UNH) , which is a component of the Dow Jones Industrial Average. The Dow 30 ended Wednesday down 0.8% year to date, while UnitedHealth was up 6.8%.

Aetna (AET) ($96.05) had a gain of 30% last year, and the stock set its all-time high of $96.90 on Feb. 4. The stock is up 8.1% for the year to date and is above its 50-day and 200-day simple moving averages of $90.13 and $82.26, respectively.

The weekly chart is positive but overbought, with its key weekly moving average at $91.67 and its 200-week SMA at $67.30.

Investors looking to buy Aetna should enter a good 'til canceled limit order to buy weakness to key semiannual and monthly technical levels at $94.43 and $92.22, respectively. Investors looking to book profits should enter a good 'til canceled limit order to sell strength to a key quarterly technical level at $100.80.

Cigna (CI) ($110.10) had a gain of 18% last year, and the stock set its all-time high of $112.95 on Jan. 23. The stock is up 7% year to date and is above its 50-day and 200-day SMAs of $105.17 and $95.25, respectively.

The weekly chart is positive but overbought with its key weekly moving average at $106.45 and its 200-week SMA at $66.16.

Investors looking to buy Cigna should enter a good 'til canceled limit order to buy weakness to key semiannual and monthly technical levels at $107.48 and $107.18, respectively. Investors looking to book profits should enter a good 'til canceled limit order to sell strength to a key quarterly technical level at $117.96.

Centene (CNC) ($115.10) had a gain of 76% last year, and the stock set its all-time high of $116.14 on Feb. 4. The stock is up 11% year to date and is above its 50-day and 200-day SMAs at $104.82 and $84.53, respectively.

The weekly chart is positive but overbought with its key weekly moving average at $107.17 and its 200-week SMA at $53.42.

Investors looking to buy Centene should enter a good 'til canceled limit order to buy weakness to key quarterly and semiannual technical levels at $102.93 and $94.88, respectively. Investors looking to book profits should use a sell stop below its key weekly moving average at $107.17, which will be rising each week.

HealthNet (HNT) ($55.38) had a gain of 80% last year, and the stock set its all-time high of $56.72 on Jan. 28. The stock is up 3.5% year to date and is above its 50-day and 200-day SMAs at $52.97 and $45.60, respectively.

The weekly chart is positive but overbought with its key weekly moving average at $53.62 and its 200-week SMA at $32.75.

Investors looking to buy Healthnet should enter a good 'til canceled limit order to buy weakness to key quarterly and semiannual technical levels at $53.60 and $44.08, respectively. Investors looking to book profits should enter a good 'til canceled limit order to sell strength to a key monthly technical level at $57.09.

Humana (HUM) ($150.54) had a gain of 39% last year, and the stock set its all-time high of $155.30 on Jan. 23. The stock is up 4.8% year to date and is above its 50-day and 200-day SMAs of $144.89 and $130.95, respectively.

The weekly chart is positive but overbought with its key weekly moving average at $146.49 and its 200-week SMA at $93.33.

Investors looking to buy Humana should enter a good 'til canceled limit order to buy weakness to key semiannual and monthly technical levels at $148.99 and $146.15, respectively. Investors looking to book profits should enter a good 'til canceled limit order to sell strength to a key quarterly technical level at $155.38.

UnitedHealth ($107.92) had a gain of 34% last year, and the stock set its all-time high of $114.32 on Jan. 23. The stock is up 6.8% year to date and is above its 50-day and 200-day SMAs of $102.75 and $88.75, respectively.

The weekly chart is positive but overbought with its key weekly moving average at $104.55 and its 200-week SMA at $65.27.

Investors looking to buy UnitedHealth should enter a good 'til canceled limit order to buy weakness to a key semiannual technical level at $99.32. Investors looking to book profits should enter a good 'til canceled limit order to sell strength to a key weekly technical level at $108.24.

Key technical levels in between are $106.05, $106.15 and $107.69.

Here is the daily chart for UnitedHealth:


Courtesy of MetaStock Xenith

Here is the weekly chart for UnitedHealth:


Courtesy of MetaStock Xenith

The weekly charts for all six health care stocks shift to negative given weekly closes below their key weekly moving averages.

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This article is commentary by an independent contributor. At the time of publication, the author held no positions in the stocks mentioned.