For round 2 investors- Old valuation = €509,475,498 & Old share price = €3.116 means €509,475,498 ÷ 3.116 ≈ 163,500,000 shares (approx). and new valuation based on this round ≈ €1,196,000,000 (Converted $1.3B into € as per recent fx rate of 1$=0.92 EUR ) means 1,196,000,000 ÷ 163,500,000 ≈ €7.31 per share. Gain=7.31−3.116=4.194
So about €4.19 gain per share, which is a 134% increase.
I might be off somewhere in the calculation, so feel free to correct me if needed 🙌