U.S. stock markets ended on a positive note in August after mixed June and July. The astonishing bull run of Wall Street, which started in 2023, has continued this year albeit at a slow pace.
At this stage, we have identified five growth stocks that investors should purchase to strengthen their portfolios in September. Growth investors are primarily focused on stocks with aggressive earnings or revenue growth, which should propel prices higher in the future.
The stocks are: Comfort Systems USA Inc. FIX, Quanta Services Inc. PWR, Seagate Technology Holdings plc STX, Sandisk Corp. SNDK and Semtech Corp. SMTC. Each of our picks sports a Zacks Rank #1 (Strong Buy) and has a Growth Score of A. You can see the complete list of today’s Zacks #1 Rank stocks here.
The chart below shows the price performance of our five picks in the past month.
Image Source: Zacks Investment Research
Comfort Systems USA Inc.
Comfort Systems operates primarily in the commercial and industrial heating, ventilation and air conditioning (HVAC) markets. The data center boom, driven by AI, cloud computing, and high-performance computing, is fueling demand for specialized HVAC solutions from FIX.
Cooling systems for these facilities should deliver precise and reliable performance, prompting investments in advanced technologies such as liquid cooling and modular units. This segment is becoming a significant growth driver for FIX, offering high-margin growth and attracting M&A activity.
Backlog as of June 30, 2026, totaled $14.06 billion, increasing 12.9% from $12.45 billion at March 31, 2026, and jumping 73.2% from $8.12 billion reported a year ago. On a same-store basis, backlog climbed to $13.70 billion from $8.12 billion in the year-ago period.
Solid Estimate Revisions
Comfort Systems has an expected revenue and earnings growth rate of 38.3% and 60.7%, for the current year. The Zacks Consensus Estimate for the current year’s earnings has improved 0.04% over the last 30 days.
Quanta Services Inc.
Quanta Services is well-positioned to capitalize on robust infrastructure spending across utility, power generation, technology and load center markets. The ongoing expansion of AI data centers, grid modernization, renewable generation and advanced manufacturing is driving customers to undertake larger, multiyear infrastructure programs.
Surging AI-related power demand and expanding utility investments are driving data center project opportunities, making data centers a central pillar of PWR’s long-term growth strategy. The company is heavily investing in deepening its vertical supply chain to offset the ongoing global uncertainties and rising inflation.
