S&P/ASX 200 Index (ASX: XJO) shares are down 1.3% to 8,708.5 points on Friday.
Meanwhile, brokers have lifted their ratings on several ASX shares this week.
Let's review.

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Northern Star Resources Ltd (ASX: NST)
The Northern Star Resources share price is $21.59, down 4.2% today.
Over the past month, this ASX 200 gold share has fallen 5%.
UBS upgraded Northern Star shares to a buy rating on Wednesday.
The broker raised its 12-month price target from $24.25 to $29.40.
This implies a potential 36% upside ahead.
HomeCo Daily Needs REIT (ASX: HDN)
The HomeCo Daily Needs REIT share price is $1.09, down 1.4% today.
Over the past month, this real estate investment trust (REIT) has fallen 16%.
UBS upgraded HomeCo Daily Needs REIT shares to a buy rating yesterday.
The broker has a 12-month price target of $1.30.
This implies a potential 19% upside ahead.
Whitehaven Coal Ltd (ASX: WHC)
The Whitehaven Coal share price is $8.70, down 1.6% today.
Over the past month, this ASX coal share has ascended 13%.
JP Morgan upgraded Whitehaven Coal shares to a buy rating this week.
The broker increased its 12-month price target from $8.20 to $9.30.
This indicates potential capital gains of 7% over the next year.
Regis Resources Ltd (ASX: RRL)
The Regis Resources share price is $7.56, down 4.9% today.
Over the past month, the gold mining stock has lifted 1.6%.
UBS upgraded Regis Resources shares to a hold rating this week.
The broker raised its 12-month price target from $8 to $8.90.
This suggests a potential 17% upside ahead.
Bapcor Ltd (ASX: BAP)
The Bapcor share price is 81 cents, up 0.3% today.
Over the past month, this ASX consumer discretionary share has lost 92% of its market valuation.
Morgans upgraded Bapcor shares to a hold recommendation with an 88-cent target.
This implies a potential 10% upside ahead.
Ora Banda Mining Ltd (ASX: OBM)
The Ora Banda Mining share price is $1.52, down 5% today.
Over the past month, the ASX gold mining share has risen 11%.
UBS upgraded Ora Banda Mining shares to a buy rating this week.
The broker raised its 12-month price target from $1.80 to $1.95.
This indicates potential capital gains of 28% over the next year.
ARB Corporation Ltd (ASX: ARB)
The ARB Corporation share price is $18.42, down 0.8% today.
Over the past month, this ASX retail share has fallen 9%.
Canaccord Genuity upgraded ARB shares to a buy rating this week.
The broker increased its 12-month price target from $21.80 to $25.40.
This suggests a potential 38% upside ahead.
Alkane Resources Ltd (ASX: ALK)
The Alkane Resources share price is $1.82, down 3.9% today.
Over the past month, Alkane Resources shares have risen 14%.
UBS upgraded the ASX gold and antimony miner to a buy rating this week.
The broker raised its 12-month price target from $2 to $2.35.
This suggests potential capital growth of 29% over the next year.
National Australia Bank Ltd (ASX: NAB)
The NAB share price is $38.50, up 2% today.
Over the past month, NAB shares have fallen 7%.
Goldman Sachs upgraded the ASX 200 bank share to a hold rating yesterday.
The broker raised its price target from $38.75 to $39.75.
This suggests a potential 17% upside ahead.