If you thought your portfolio had gone down or nowhere over the past month, trust me, you’re not alone.

The S&P/ASX 200 (Index: ^AXJO) (ASX: XJO) has gone virtually nowhere over the past month – losing 2.5% of its value and sinking below 5,300 points. Even the S&P/ASX Small Ordinaries (Index: ^AXSO) (ASX: XSO) has dropped 5%.

But despite the performance of the indices, several companies have seen large jumps in their share prices.

Here are the top 10 gainers over the past month on the ASX (of those that were listed a month ago).

Company Share Price Market Cap ($m) Price move
Brainchip Holdings Ltd (ASX: BRN) $0.21 $88.3 100.0%
Yancoal Australia Ltd (ASX: YAL) $0.41 $56.4 93.0%
Karoon Gas Australia Limited (ASX: KAR) $2.29 $562.9 81.0%
Resource Generation Ltd (ASX: RES) $0.15 $87.2 58.0%
Hexagon Resources Ltd (ASX: HXG) $0.27 $66.0 54.0%
Austin Engineering Ltd. (ASX: ANG) $0.19 $102.6 50.0%
Hills Ltd (ASX: HIL) $0.69 $160.1 50.0%
UGL Limited (ASX: UGL) $3.20 $533.7 47.0%
Nearmap Ltd (ASX: NEA) $0.83 $296.6 43.0%
Steamships Trading Company Limited (ASX: SST) $22.50 $697.7 42.0%

Source: S&P Global Markets Intelligence, Google Finance

Several of the moves are quite self-explanatory.

Brainchip announced in late September that it was rolling out its casino table security technology at one of Los Vegas’ biggest casinos following a successful trial. The technology is expected to be rolled out to more of the group’s casinos after that. As you might expect, there’s plenty of potential with Brainchip’s technology.

Yancoal has been rumoured to be interested in Rio Tinto Limited’s (ASX: RIO) thermal coal assets, and also benefitting from soaring coal prices.

Karoon Gas saw its share price soar on a potential deal to acquire stakes in two oil projects, including a producing field off the coast of Brazil.

Resource Generation has reported that it expects to have its Boikarabelo coal mine constructed and delivering coal to market in around 2 years.

Hexagon Resources announced that it had excellent stage 1 lithium battery results from its McIntosh project in WA. Lithium companies tend to soar on any positive news these days.

Austin Engineering saw a new CEO appointed in early October, and has probably benefitted from the announced takeover of fellow mining engineering firm Bradken Limited (ASX: BKN) at the start of this month.

Hills Ltd (ASX: HIL) announced that it will receive 3 years of licence fees and cash receipts from Woolworths Limited (ASX: WOW) following the closure of its Masters home hardware business.

UGL received a takeover offer from Cimic Group Ltd (ASX: CIM) hence its share price soaring.

Nearmap had an excellent quarterly update just over a week ago which saw the share price fly.

And finally, Steamships Trading Co is highly illiquid, and its share price jumped because 3,000 shares traded in mid-October pushing the share price from $16.90 to $22.50.

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Motley Fool writer/analyst Mike King owns shares in Nearmap. You can follow Mike on Twitter @TMFKinga

The Motley Fool Australia has no position in any of the stocks mentioned. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy. This article contains general investment advice only (under AFSL 400691). Authorised by Bruce Jackson.