Professional investors running mutual funds and hedge funds don't just look at a stock's fundamentals, they also track unusual volume. Often, when heavy volume hits a stock, it precedes a sharp increase in share price.

Unusual volume can signal institutional activity, such as insider buying or selling, or buying or selling by "superinvestors." These types of investors like to get in well before a bigger trend, so it's always prudent to scan the market for unusual volume activity across all sectors.

With that in mind, let's take a look at six stocks that are showing up on unusual volume scans.

Radius Health

  • Monday's Volume: 7.51 million
  • Three-Month Average Volume: 955,319
  • Volume % Change: 620%

From a technical perspective, Radius Health (RDUS - Get Report) gapped-up sharply here, back above both its 20-day at $36.16 and its 50-day at $37.12 with monster upside volume flows. This high-volume rip to the upside is now quickly pushing shares of Radius Health within range of triggering a major breakout trade above a key downtrend line.

Traders should now look for long-biased trades in Radius Health as long as it's trending above some near-term support at $35 and then once it breaks out above some near-term resistance levels at $42 to $43.30 with volume that hits near or above 955,319 shares. Some possible upside targets off that breakout are its 200-day at $45.46 to $48.44, or even $50 to $55 a share.

Advanced Disposal Services

  • Monday's Volume: 2.10 million
  • Three-Month Average Volume: 316,375
  • Volume % Change: 715%

From a technical perspective, Advanced Disposal Services (ADSW - Get Report) jumped notably higher here right into its 20-day at $22.78 with strong upside volume flows. This high-volume spike to the upside is now quickly pushing this stock within range of triggering a major breakout trade.

Traders should now look for long-biased trades in Advanced Disposal Services as long as it's trending above some key near-term support at $20.94 and then once it breaks out above its 20-day at $22.78 and its 50-day at $22.95 and then above its all-time high of $24.10 with volume that hits near or above 316,375 shares. If that breakout hits soon, then this stock will set up to enter new all-time-high territory, which is bullish technical price action. Some possible upside targets off that move are $30 to $35 a share.

Blackstone Group

  • Monday's Volume: 20.83 million
  • Three-Month Average Volume: 4.63 million
  • Volume % Change: 342%

From a technical perspective, Blackstone Group (BX - Get Report) gapped up sharply and broke out above resistance at $31.20 into new 52-week-high territory with monster upside volume. Market players should now look for a continuation move higher in the short-term if this stock manages to clear Monday's intraday high of $32.33 with strong volume.

Traders should now look for long-biased trades in Blackstone Group as long as it's trending above $31.20 or above its 50-day at $29.51 and then once it clears $32.33 with volume that hits near or above 4.63 million shares. If that move gets underway soon, then this stock will set up to re-test or possibly take out its next key resistance levels at $35 to $36, or even $38 a share.

Nova Measuring Instruments

  • Monday's Volume: 554,000
  • Three-Month Average Volume: 193,029
  • Volume % Change: 175%

From a technical perspective, Nova Measuring Instruments (NVMI - Get Report) spiked sharply here right above some near-term support at $23.39 and broke out into new 52-week-high territory with strong upside volume. Market players should now look for a continuation move to the upside in the short-term if this stock clears its new 52-week high of $26.30 with strong volume.

Traders should now look for long-biased trades in Nova Measuring Instruments as long as it's trending above support at $23.39 or above its 20-day at $21.87 and then once it clears $26.30 with volume that hits near or above 193,029 shares. Some possible upside targets off that move are $30 to $35, or even $40 a share.

Foot Locker

  • Monday's Volume: 7.04 million
  • Three-Month Average Volume: 2.16 million
  • Volume % Change: 248%

From a technical perspective, Foot Locker (FL - Get Report) trended up here right above its recent low of $58.13 with big upside volume. This high-volume move higher is now quickly pushing shares of Foot Locker within range of triggering a big breakout trade.

Traders should now look for long-biased trades in Foot Locker as long as it's trending above its recent low of $58.13 and then once it breaks out above Monday's intraday high of $61 and above its recent gap-down-day high near $61.50 with volume that hits near or above 2.16 million shares. If that breakout develops soon, then this stock will set up to re-fill some of its recent gap-down-day zone that started near $72 a share.

Ichor Holdings

  • Monday's Volume: 1.35 million
  • Three-Month Average Volume: 390,950
  • Volume % Change: 201%

From a technical perspective, Ichor Holdings (ICHR - Get Report) exploded higher here and broke out into new all-time-high territory above $21.45 with strong upside volume flows. Market players should now look for a continuation move higher in the short-term if this stock manages to clear Monday's intraday high of $22.40 with strong volume.

Traders should look for long-biased trades in Ichor Holdings as long as it's trending above its 20-day at $20.09 or above its 50-day at $19.15 and then once it clears and closes over $22.40 with volume that hits near or above 390,950 shares. Some possible upside targets off that move are $25 to $30, or even $35 a share.

This article is commentary by an independent contributor. At the time of publication, the author held no positions in the stocks mentioned.