Four shares that have not let that hold them back are listed below. Here's why they are ending the week with a bang:

The Airxpanders Inc (ASX: AXP) share price has rocketed 26% to 12.5 cents after the medical device company announced the raising of approximately A$20.3 million via a placement and underwritten pro-rata non-renounceable rights offering. The rights offering aims to raise A$15.7 million at A$0.075 per CDI. Supporting this is a private placement which has been made to certain U.S. investors to raise approximately US$3.4 million (A$4.6 million) at an issue price of US$0.167 per share.

The Blue Sky Alternative Investments Ltd (ASX: BLA) share price has pushed a further 13% higher to $2.61. Investors have been fighting to get hold of shares of the embattled asset manager after Macquarie Group Ltd (ASX: MQG) was revealed to be a substantial holder. Macquarie has been busy buying shares as the Blue Sky share price collapsed.

The Kogan.com Ltd (ASX: KGN) share price has continued its recovery and is up almost 5% to $5.17. The ecommerce company's shares had been down as much as 53% from their 52-week high recently following a softer than expected trading update. Some investors appear to believe that this pushed them into bargain territory and have been snapping them up. I still think that Kogan's shares are great value.

The Pilbara Minerals Ltd (ASX: PLS) share price is up 6% to 89.7 cents following the release of the definitive feasibility study for the Stage 2 5Mtpa Pilgangoora Lithium-Tantalum project. The study outlined a compelling case for the expansion to proceed and estimated the project to have a net present value of $2.16 billion, with life of mine project revenue estimated to be $12.2 billion and EBITDA of $6.3 billion.

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Because of recent market volatility the index has only managed to carve out a paltry gain of approximately 2% during the period.

While this is a disappointing result, spare a thought for the three worst performers on the index during this time. They are as follows:

The Titan Minerals Ltd (ASX: TTM) share price has lost almost 92% of its value over the last 12 months. This gold and copper mineral exploration company, formerly known as Minera Gold, is looking anything but a titan after its fall from grace. That fall occurred when the company was forced to go through a reconstruction and recapitalisation process following a troubling period that led to it falling into administration. While the company is looking stronger now, I think it is too soon to consider an investment.

The Airxpanders Inc (ASX: AXP) share price has shed over 84% of its value since this time last year. A good portion of this decline has come in recent weeks following the surprise resignation of its CEO Scott Dodson. As well as this, investors appear concerned that the medical device company, which is focused on the design, manufacture, sale and distribution of the AeroForm Tissue Expander System, may never be as profitable as once hoped. The company has been burning through its cash and only generated US$3 million of revenue during the first year of commercialisation. I would stay clear of Airxpanders until there is a notable uptick in its revenue.

The Retail Food Group Limited (ASX: RFG) share price is down a remarkable 83% over the last 12 months. Negative media coverage alleging that the food and beverage company mistreated its franchisees has weighed heavily on its share price and its financial performance. Unfortunately for Retail Food Group, I fear that this has created a vicious cycle that could ultimately lead to it going out of business. After all, I suspect you couldn't give away its franchises at the moment given the negative media reports. Which is especially troubling given the sizeable number of franchise closures that is expected.

The post Here are the worst performers on the All Ordinaries over the last 12 months appeared first on The Motley Fool Australia.

Four shares that have failed to follow the market higher today are listed below. Here's why they have tumbled lower:

The Avz Minerals Ltd (ASX: AVZ) share price has continued its decline and is down a further 4.5% to 21.5 cents. Shareholders of the lithium-focused mineral exploration company appear to have lost faith with management after potentially sensitive on-site images were leaked on social media by one of the company's paid advisors. No action has been taken by the company thus far.

The Airxpanders Inc (ASX: AXP) share price has fallen a further 2.5% to 19 cents. On Monday the medical device company's shares halved in value after the shock resignation of its president and CEO. No reason was given for the surprise departure, which appears to have left shareholders concerned that there are problems behind the scenes.

The Idp Education Ltd (ASX: IEL) share price has dropped almost 3% to $7.24 despite there being no news out of the international student placement and language testing services company. I suspect that IDP Education's shares are under pressure today from profit taking. After all, even after today's decline the company's shares are up over 64% since this time last year.

The Resapp Health Ltd (ASX: RAP) share price has tumbled over 5.5% to 16.5 cents after returning from a trading halt. This morning the medical technology company announced that it has developed an obstructive sleep apnoea (OSA) screen test for smart phones. The app uses machine-learning algorithms to measure the severity of OSA in a patient's overnight breathing and snoring sounds recorded using a smartphone placed on a bedside table. The company is now recruiting patients for trials. Investors appear disappointed that the announcement wasn't related to its ongoing Smartcough trial.

The post Why these 4 ASX shares tumbled lower today appeared first on The Motley Fool Australia.

Four shares that have failed to follow the market higher today are listed below. Here's why they have started the week in the red:

The Airxpanders Inc (ASX: AXP) share price has plunged 50% to 20 cents after the medical device company announced the surprise resignation of its president and chief executive officer Scott Dodson with immediate effect. No reason has been given for the departure, which appears to have left shareholders concerned that all is not well at the company.

The Avz Minerals Ltd (ASX: AVZ) share price has continued its slump and is down a further 2% to $2.22. The lithium-focused mineral exploration company's shares have come under significant selling pressure since it admitted that a paid adviser leaked potentially sensitive images from its Manono project on social media. I would stay clear of AVZ Minerals whilst the two parties continue to work together.

The Mineral Resources Limited (ASX: MIN) share price has fallen 4% to $16.54 after the company announced that it has entered into a binding scheme implementation deed with Atlas Iron Limited (ASX: AGO) in relation to a combination of the two companies. It appears Mineral Resources shareholders don't see as much value in the deal as Atlas shareholders. According to the release, Atlas shareholders will receive 1 new Mineral Resources share for every 571 Atlas shares they own on the record date.

The Tawana Resources N.L. (ASX: TAW) share price has tumbled almost 8% to 42 cents after announcing that it has received commitments to raise $20 million via the issue of 48,780,488 new fully paid ordinary shares at 41 cents per share. The funds will primarily be used for additional working capital, to enable continued commissioning of the Bald Hill Lithium and Tantalum Mine in Western Australia, and capital expenditure including feasibility studies on expansion projects.

The post Why these 4 ASX shares started the week in the red appeared first on The Motley Fool Australia.

At the time of writing the medical device company's shares are down 50% to 20 cents.

Why are Airxpanders Inc shares being crushed?

This morning Airxpanders announced that Scott Dodson has resigned as its president and chief executive officer with immediate effect.

No reason has been given for the exit of Dodson, who led the company through the early clinical trials, its IPO, FDA clearance, and the launch of AeroForm in Australia and the United States.

According to the release, the company's current CFO and COO, Scott Murcray, has been appointed interim president and CEO.

Mr Murcray will steady the ship while executive search firm Korn Ferry assists the company in identifying and hiring a new CEO. The board believe that the availability of strong talent in the medical device industry and the attractiveness of Airxpanders' opportunity means the company will be successful in appointing a new CEO in the near-term.

Judging by the share price reaction and the volume of shares traded (10x normal levels), shareholders appear to believe that Mr Dodson was the driving force behind the manufacturer of innovative medical devices to improve breast reconstruction and could struggle without him.

In addition to this, the sudden departure of a CEO never goes down well with the market and often leads to sharp share price declines like today or last week with market darling Lovisa Holdings Ltd (ASX: LOV). This is because in the past a sudden departure has often been a precursor to bad news.

Should you buy the dip?

I would stay clear of Airxpanders for now. Whilst I like its technology, its sales growth is certainly lacking.

As well as announcing the resignation of Mr Dodson, the board revealed that sales in the first quarter of FY 2018 have been flat on the fourth quarter of FY 2017. This means the company is continuing to operate at a loss and could require a capital raising within 12 months by my calculations.

I think medical device peers such as Cochlear Limited (ASX: COH) and ResMed Inc. (ASX:RMD) would be better options for investors.

The post The Airxpanders Inc share price has dropped 50% today appeared first on The Motley Fool Australia.