Buy 5 AI-Powered Momentum Stocks for September After a Strong August

August ended higher with the Dow up >1% and the S&P 500 and Nasdaq gaining 2.6% and 3.9%, supported by a renewed AI trade. The article highlights five AI-related “Zacks #1 (Strong Buy)” names—NVIDIA, Super Micro Computer, Semtech, SiTime, and Keysight—each with a Zacks Momentum Score of A, arguing momentum should persist into September. For NVIDIA specifically, Data Center revenues reached $89B in Q2 FY2027 (+117% YoY), with management pointing to Vera Rubin shipping that is expected to lift throughput materially and increase revenue opportunity per gigawatt to ~$40B from $25B.

Analysis

The important signal is not “AI is hot” but that spend is broadening from compute into the tollbooths around it: networking, timing, test, and rack integration. That favors NVDA as the platform owner, but the higher-beta upside over the next 1-3 months may actually sit in SMTC, SITM, and KEYS because they are earlier in the adoption curve and still have room for estimate revisions to drive multiple expansion.

Second-order, this is less bullish for undifferentiated system assemblers and late-cycle accelerator rivals. SMCI can still grow fast, but its economics depend on platform transition timing and customer concentration; if the mix shifts toward more complex, early-ship programs, the risk is not demand but gross-margin volatility and working-capital strain. By contrast, NVDA’s cadence can compress competitors’ upgrade windows and make alternative AI accelerators look like “good enough” rather than must-have.

The contrarian issue is crowding: consensus is treating this as a clean September continuation trade when the real catalyst path is binary. If hyperscaler capex commentary in the next 1-2 earnings cycles merely normalizes instead of re-accelerating, the basket can de-rate quickly because these names trade on duration, not current earnings. Falsifiers are simple: any sign of delayed rack deployments, weaker networking attach, or guidance cuts would hit the small caps first and then spill into NVDA multiple compression over 6-18 months.

Key Decisions for Investors

• Stay long NVDA on tactical pullbacks over the next 2-6 weeks; best risk/reward is if the market gives back some of the recent momentum but hyperscaler capex commentary remains firm. Falsifier: any sign of order digestion or a downgrade in data-center revenue trajectory.
• Pair trade: long SMTC / short SMCI for 1-3 months. Thesis: component content with sole-source positions and improving mix should outperform the systems layer if AI buildout continues, while SMCI carries higher execution and margin-risk. Falsifier: SMCI posts clear gross-margin expansion and backlog conversion without working-capital stress.
• Accumulate SITM on weakness as a 6-12 month structural timing-content trade. The upside is tied to rising synchronization density in AI infrastructure, but the entry should wait for post-rally consolidation. Falsifier: Renesas integration fails to broaden design wins or data-center timing attach stalls.
• Use KEYS as the lower-beta way to play AI photonics/test capex over 3-6 months; prefer it to more crowded semiconductor beta if the goal is to capture capital spending without full accelerator exposure. Falsifier: advanced-node and photonics spending rolls over or order wins fail to convert to revenue.