The S&P/ASX 200 Index (ASX: XJO) had a tough start to the trading week this Monday, along with many ASX shares. After ending the week on a sour note last week, investors clearly didn't regain any confidence over the weekend.
The ASX 200 spent today's entire session in red territory and ended up closing down 0.49%. That leaves the index at 8,701.8 points.
This rough start to trading this week for Australian investors comes after a more positive end to the American week on Friday night (our time).
The Dow Jones Industrial Average Index (DJX: .DJI) barely broke even, inching just 0.025% higher.
The tech-heavy Nasdaq Composite Index (NASDAQ: .IXIC) was far more confident, though, rising a happy 1.71%.
But let's get back to this week and the local markets now for a look at what was happening with the different ASX sectors today.

Image source: Getty Images
Winners and losers
Despite the market's drop, we still had a few sectors that managed to move higher today.
But first, it was healthcare stocks that bore the brunt of investors' displeasure this Monday. The S&P/ASX 200 Healthcare Index (ASX: XHJ) had a hrorid 6.47% wiped from it today. Thank CSL Ltd (ASX: CSL)'s brutal sell-off for this, which we checked out earlier.
Gold shares were torched too, with the All Ordinaries Gold Index (ASX: XGD) slumping 1.27%.
Financial stocks were also hit hard. The S&P/ASX 200 Financials Index (ASX: XFJ) ended up tanking 0.74%.
Industrial shares weren't in favour either, evident by the S&P/ASX 200 Industrials Index (ASX: XNJ)'s 0.45% dive.
Nor were utilities stocks. The S&P/ASX 200 Utilities Index (ASX: XUJ) suffered a 0.3% swing against it this session.
Consumer discretionary shares came next, with the S&P/ASX 200 Consumer Discretionary Index (ASX: XDJ) dipping 0.21%.
Tech stocks were also overlooked. The S&P/ASX 200 Information Technology Index (ASX: XIJ) had drifted 0.15% lower by the end of trading.
Communications shares were just behind that, illustrated by the S&P/ASX 200 Communication Services Index (ASX: XTJ)'s 0.14% slide.
Our last losers this Monday were consumer staples stocks. The S&P/ASX 200 Consumer Staples Index (ASX: XSJ) saw its value slip by 0.02% this session.
Let's turn to the winners now. Leading the green sectors were energy shares, with the S&P/ASX 200 Energy Index (ASX: XEJ) shooting 1.09% higher.
Mining stocks were in demand as well. The S&P/ASX 200 Materials Index (ASX: XMJ) managed to jump 0.37%.
Finally, real estate investment trusts (REITs) pulled a proverbial rabbit out of the hat, as you can tell by the S&P/ASX 200 A-REIT Index (ASX: XPJ)'s 0.34% bump.
Top 10 ASX 200 shares countdown
Healthcare stock 4DMedical Ltd (ASX: 4DX) came in at the top spot on the index today. 4D Medical shares rose 7.17% today to finish at $3.44 each. This wasn't caused by any news, but may be a rebound after the past month's near-50% loss.
Here's the rest of today's best:
| ASX-listed company | Share price | Price change |
| 4DMedical Ltd (ASX: 4DX) | $3.44 | 7.17% |
| Dyno Nobel Ltd (ASX: DNL) | $3.54 | 6.63% |
| Metcash Ltd (ASX: MTS) | $2.92 | 6.57% |
| Paladin Energy Ltd (ASX: PDN) | $13.21 | 5.76% |
| Silex Systems Ltd (ASX: SLX) | $6.15 | 5.31% |
| Capstone Copper Corp (ASX: CSC) | $13.02 | 5.25% |
| Deep Yellow Ltd (ASX: DYL) | $1.81 | 4.62% |
| Neuren Pharmaceuticals Ltd (ASX: NEU) | $13.39 | 4.61% |
| Infratil Ltd (ASX: IFT) | $12.86 | 3.71% |
| Predictive Discovery Ltd (ASX: PDI) | $0.98 | 3.70% |
Our top 10 shares countdown is a recurring end-of-day summary that shows which companies made big moves on the day. Check in at Fool.com.au after the weekday market closes to see which stocks make the countdown.