Inclusion in a famous family of stock indexes was the fuel propelling Argan‘s (AGX +12.73%) equity to a double-digit gain on Monday. The industrial construction specialist, already a popular investment thanks to its involvement in artificial intelligence (AI) build-outs of data centers, saw its share price rise by nearly 13% that trading session.

One of 600

After market close on Friday, S&P Dow Jones Indices — a key business unit of financial information and data company S&P Global — announced a raft of changes to its indexes.

Argan was tapped to join the S&P SmallCap 600 index. It was one of 16 such “graduations” in a class that included stocks such as rideshare company Lyft, dating website operator Match Group, and Sphere Entertainment.

Argan, along with most of the others, will formally become an index component before market open on Monday, March 23.

Today’s Change

(12.73%) $52.75

Current Price

$466.95

Good timing

Despite a third-quarter earnings report that missed the consensus analyst revenue estimate — and therefore led to a brief sell-off — Argan’s stock has done extremely well lately. It’s in the right business at the right time with its AI data center activity, and it should also benefit from the Trump administration’s desire to build out American infrastructure.

I don’t think the S&P SmallCap 600 will make investors any more bullish on the stock than they already are, though it’s inarguably a feather in Argan’s cap.