It was a volatile and ultimately negative start to the trading week for the S&P/ASX 200 Index (ASX: XJO) and ASX investors this Monday.
After starting the week's trading at an opening loss this morning, the ASX 200 spent most of the day bouncing around, but ended up closing down 0.026%. That leaves the index at 8,729.4 points.
This cold-shower start to the trading week for Australian investors follows a rosier finish to the American week on Friday night (our time).
The Dow Jones Industrial Average Index (DJX: .DJI) was in decent form, rising a confident 0.72%.
The tech-heavy Nasdaq Composite Index (NASDAQ: .IXIC) wasn't quite as enthusiastic, but still managed a 0.2% gain.
But let's get back to this week and the local markets now, and check out how the various ASX sectors traversed today's tough trading conditions.

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Winners and losers
There were more red sectors than green ones this Monday.
Leading the red sectors were healthcare shares. The S&P/ASX 200 Healthcare Index (ASX: XHJ) was hit hard, plunging 1.68% this session.
Real estate investment trusts (REITs) were also out of favour, with the S&P/ASX 200 A-REIT Index (ASX: XPJ) diving 0.7%.
Financial stocks had more sellers than buyers, too. The S&P/ASX 200 Financials Index (ASX: XFJ) dropped 33% today.
Consumer staples shares were no safe haven either, evidenced by the S&P/ASX 200 Consumer Staples Index (ASX: XSJ)'s 0.3% dip.
Utilities stocks came in just in front of that. The S&P/ASX 200 Utilities Index (ASX: XUJ) retreated 0.26% this Monday.
Industrial shares were also in that ballpark, with the S&P/ASX 200 Industrials Index (ASX: XNJ) getting a 0.23% trim.
We can say the same again for consumer discretionary stocks. The S&P/ASX 200 Consumer Discretionary Index (ASX: XDJ) slid 0.22% lower.
Our last losers this Monday were communications shares, illustrated by the S&P/ASX 200 Communication Services Index (ASX: XTJ)'s 0.19% slip.
Turning to the green sectors now, it was tech stocks that dominated. The S&P/ASX 200 Information Technology Index (ASX: XIJ) ended up rocketing 5.43% higher.
Gold shares were a little tamer, with the All Ordinaries Gold Index (ASX: XGD) jumping 0.68%.
Broader mining stocks weren't far off that. The S&P/ASX 200 Materials Index (ASX: XMJ) added 0.49% to its total this session.
Finally, energy shares managed to get over the line, as you can see from the S&P/ASX 200 Energy Index (ASX: XEJ)'s 0.34% improvement.
Top 10 ASX 200 shares countdown
Most ASX tech shares were hot today, but SiteMinder Ltd (ASX: SDR) took the cake. SiteMinder shares spiked 10.86% this session to close the day at $3.88 each.
Despite this notable leap higher, we didn't get any price-sensitive news out from the company.
Here's the rest of today's best:
| ASX-listed company | Share price | Price change |
| SiteMinder Ltd (ASX: SDR) | $3.88 | 10.86% |
| Pro Medicus Ltd (ASX: PME) | $144.46 | 9.22% |
| WiseTech Global Ltd (ASX: WTC) | $39.15 | 8.72% |
| Xero Ltd (ASX: XRO) | $80.95 | 7.69% |
| Megaport Ltd (ASX: MP1) | $16.61 | 7.02% |
| TechnologyOne Ltd (ASX: TNE) | $31.75 | 6.40% |
| IDP Education Ltd (ASX: IEL) | $2.37 | 6.28% |
| Life360 Inc (ASX: 360) | $20.37 | 5.38% |
| Zip Co Ltd (ASX: ZIP) | $2.42 | 5.22% |
| Aussie Broadband Ltd (ASX: ABB) | $5.64 | 5.03% |
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.