A volatile week fuelled by international trade spats and a swathe of mixed local economic data kept investors on their toes this week, with the bears ultimately prevailing. Having reached a new all-time high last week, the ASX fell sharply, notching up two of its worst trading days in several months. At the close of trade on Friday, the ASX 200 settled on 6707 points (-2%), while the All Ordinaries finished on 6813.5 (-1.9%).New US tariffs aimed at metals imports from Brazil and Argentina caught the market off guard, with US-China trade sentiment also wavering through the week. There were no catalysts on the local front as the RBA held interest rates steady, while subdued GDP data failed to inspire buying confidence.

Which shares excelled?

Given the magnitude of this week sell-off, it wasn't hard to notice the stocks that defied the trend. A clear winner was oOh!Media (ASX: OML), which soared 21.1% on the back of a trading update. After previously downgrading its earnings guidance in August, the outdoor advertising and media company upgraded its EBITDA forecasts from an estimated $125-135 million to $138-143 million.In the small cap sector, Adairs (ASX: ADH) rocketed 26.4% higher after the homewares retailer announced a $75 million acquisition. The company has its eyes focused on acquiring Mocka, a New Zealand-based online furniture and baby goods retailer.Shares in Resolute Mining (ASX: RSG), Perseus Mining (ASX: PRU) and Champion Iron (ASX: CIA) all performed strongly throughout the week. Resolute Mining was the only one among the trio to release any news, with its Senegalese drilling operations update well received by the market.[caption id="attachment_2520" align="aligncenter" width="500"]

Advertising business oOh!media enjoyed a strong week of trading[/caption]

Which shares dragged on the market?

There were no shortage of shares which dragged on the market this week, with numerous high-profile stocks falling victim to the broad sell-off.

One of the hardest-hit stocks was Boral (ASX: BLD), with shares tanking -10.3% on news the company had identified financial irregularities in its US operations that were likely to impact EBITDA.WiseTech Global (ASX: WTC) investors also had a hard time this week. Like some of its tech peers, the company was left exposed to a risk off' mentality that swept over the market, compounded by the fact that the company has recently been a target for shorters.Treasury Wine Estate (ASX: TWE) and Jumbo Interactive (ASX: JIN) were among the casualties this week, with shares slumping 8.1% and 7.3% respectively.Shares in Metcash (ASX: MTS) came under heavy selling pressure following news that the wholesaler recorded a $237 million impairment to goodwill and other assets in its half-yearly results. Just two weeks ago the company was advised by 7-Eleven that their supply agreement would not be renewed beyond next year, which has also put an estimated $15m dent in Metcash EBIT forecasts. The stock dived 7.7% across the week.Rounding out the list, Whitehaven Coal (ASX: WHC) shareholders were left ruing their luck as the stock cratered 16.5%. In an unfortunate turn of events, the company announced that drought conditions have left it with a shortage in qualified staff, resulting in under-utilisation costs and lower productivity. If that wasn't enough, smoke and haze were said to have interfered with production. As a result, Whitehaven Coal raised production costs and slashed its production guidance.[caption id="attachment_2521" align="aligncenter" width="500"]

Shares in Whitehaven Coal were sold off sharply this week[/caption]

Other trading developments

As always, there was plenty of action in the buy-now pay-later segment, with Zip Co (ASX: Z1P) completing its $60m raise. The company issued 16.2 million shares at $3.70 each, however, the stock quickly fell below that during the mid-week market bloodbath.Afterpay (ASX: APT) initially surged on Thursday morning after providing the ASX with a record sales update, but the stock struggled to maintain the momentum and ultimately closed the week lower on account of caution from Australian broker UBS. On Friday, APT also announced it would proceed with a previously-postponed $30m share purchase plan.In a sensational development, tech darling iSignthis (ASX: ISX) initiated legal proceedings against the ASX. With the company shares suspended from trading since early October, the identity platform provider has escalated the matter to the courts amid concerns regarding the nature of its suspension and the matters of procedural fairness and good faith.Bellamy (ASX: BAL) shareholders gave the green light to the company takeover by Chinese dairy company Mengniu Dairy. The takeover now moves to court on Monday, where subject to approval, the company will trade for the last time on the ASX on Tuesday, December 10.There was also a late flurry of ipo listings this week, with their performance below. Several other companies are expected to list next week as the rush continues before the Christmas holidays.CompanyTickeripo priceFriday closeGain / LossMacarthur MineralsMIO$0.25$0.3124%Amaero International3DA$0.20$0.40100%Tyro PaymentsTYR$2.75$3.3822.9%Elanor Commercial Property FundECF$1.25$1.22-2.4%

The trading week ahead

Consumer confidence and house prices will be in the spotlight next week, with attention also likely to shift to a reading on business confidence as well.Bank of Queensland (ASX: BOQ) and Westpac (ASX: WBC) will both hold their annual general meetings next week. Shareholders will be casting their votes with both stocks in the news of late, and trading sentiment pushing them towards new year-to-date lows.

We'll be back next week with another Weekly ASX Trading Wrap Up - until then, have a great weekend!