Is Tetra Tech (TTEK) stock Halal?

Tetra Tech is a prominent global consulting and engineering services firm specializing in water, environment, and sustainable infrastructure. Tetra Tech is recognized for its expertise in water treatment, environmental management, and renewable energy, serving both government and commercial clients worldwide. For Muslim investors, though, the most pressing question is simpler: is Tetra Tech a Halal investment?

Is Tetra Tech Shariah compliant?

Yes. In the October 2026 screening Tetra Tech (TTEK) passes AAOIFI Shariah Standard No. 21: the business activity screen and every financial ratio screen hold. For industrial companies like Tetra Tech, the product is rarely the problem; aircraft, vehicles and machinery are permissible. The exposure is leverage: fleets and factories are financed, and the 30% cap that AAOIFI Shariah Standard No. 21 places on interest bearing debt is the screen that decides most verdicts in this sector.

Does Tetra Tech pass the business activity test?

Yes. In the October 2026 screening Tetra Tech holds an overall PASS, which a stock only earns when its core business clears the activity screen. The activity itself raises no Shariah objection; the scrutiny belongs to the financing.

Is Tetra Tech's income Halal?

Yes, within AAOIFI's tolerance. Tetra Tech's income from non-permissible sources stays below 5% of revenue in the October 2026 screening, and the small impure portion is handled through purification: the factor of 99.82% tells holders of TTEK what share of each dividend to keep and what remainder to donate to charity. On a dividend yield of around 0.83%, the purification amount is modest but real.

Does Tetra Tech meet AAOIFI's debt and investment ratio requirements?

Yes. Both caps hold this month: interest bearing investments and interest bearing debt each stay below 30% of market capitalisation, measured against a market capitalisation of $8.44B (market data as of 1 October 2026). Because the caps move with the share price, our Shariah Supervisory Board has TTEK re-screened every month, and the result above always shows the latest verdict.

Why do other halal screeners show a different verdict for Tetra Tech?

Screeners can disagree without either being wrong. AAOIFI Shariah Standard No. 21, which Tabadulat applies, measures interest bearing debt and investments against market capitalisation with a 30% ceiling. MSCI and FTSE measure them against total assets with a 33% ceiling, and S&P and Dow Jones Islamic use a multi year average of market capitalisation. Data dates differ too, because each provider reads filings and prices on its own schedule. The same company can therefore pass one standard and fail another in the same month. Tabadulat publishes one answer, the AAOIFI result as of October 2026, and re-screens it every month.

Tabadulat is an ADGM regulated brokerage whose license covers Shari'a Compliant Regulated Activities, as the FSRA permission names them. New to the terminology? Gharar and Maysir, Sukuk, Zakat and purification are all explained in plain English.

New to the screening method? Read AAOIFI Standards Explained: What Makes a Stock Halal?