The DAX closed Friday down 1.3% at 24,671 points, erasing the previous day's gains and capping a volatile week for German equities.
The benchmark index had finished Thursday roughly 1% higher at 24,995 points, but selling pressure returned in the final session to push the market into negative territory for the week.
The reversal highlights the fragility of recent momentum in European markets.
After a brief reprieve on Thursday, traders appeared unwilling to hold positions into the weekend, likely driven by a combination of profit-taking and broader risk-off sentiment.
The sharp intraday swings suggest that liquidity remains thin and that market participants are cautious about extending rallies without clearer macroeconomic signals.
This volatility comes amid a backdrop of global equity turbulence.