Key Highlights:

  • Wagners (ASX:WGN) was down about 8.8% over the month to 25 September, with cement cost headwinds and a softer market in focus.
  • Macmahon (ASX:MAH) was up about 14% over the week to 23 September after agreeing to buy Aspect Engineering Solutions.
  • Both stocks fell on their 18 August results days, and both remain exposed to rising rate expectations and a nervous broader market.
  • Upcoming company updates and execution against stated plans remain central to the next phase for both stocks.

The short answer is that they are not retreating in step. Wagners has slipped close to 9% over the past month despite a record FY26 result, while Macmahon has pushed to fresh 52-week highs on the back of an acquisition, so the "together" framing holds only for the post-results dip both stocks suffered in mid-August.

A jittery market for construction and Mining services

The backdrop for Australian industrial and materials stocks has turned noticeably tougher in late September. On 24 September the S&P/ASX 200 fell 0.72% to 8,702 points, with 148 of the top 200 stocks lower, as a surge in US Treasury yields rippled through global markets. Mining stocks underperformed as copper prices slipped.

Interest rates are the other pressure point. The RBA cash rate sits at 4.35% after the August hold, and the Reserve Bank meets again on 29 September. The market pricing on 24 September pointed to a high probability of a rate rise at that meeting, while economist views on the decision remained mixed. For businesses tied to building activity and Capital spending, higher borrowing costs can weigh on both customer Demand and valuation multiples.

Neither company changed index status in the September 2026 S&P/ASX quarterly rebalance, which took effect on 21 September. Wagners was, however, reported by as having been dropped from the S&P/ASX Emerging Companies Index, a small-cap benchmark, around the same time.

Wagners (ASX:WGN): strong numbers, soft share price

Wagners is a Toowoomba-based supplier of construction materials, including cement, concrete, aggregates and reinforcing steel, largely in South East Queensland. It also runs a Composite Fibre Technologies (CFT) division, which makes fibre-reinforced polymer products such as power poles and marine piles, and a Project Services arm.

Its FY26 result, released on 18 August, was strong. Revenue rose 17% to $503.9 million, operating EBIT jumped 61% to $67.2 million and net profit after tax climbed 79% to $40.6 million . Net Debt was cut to just $0.8 million from $34.0 million, and a fully franked 5-cent Dividend is payable in October.

Yet the market's response was lukewarm. The shares fell 3.94% to $4.14 on results day, . Management flagged that clinker and shipping costs could create cement headwinds in FY27, that new concrete plants will take time to reach full contribution, and that Capital Expenditure remains elevated.

As of 25 September, Wagners traded at about $4.23, down roughly 2.8% over the week and 8.8% over the month. That leaves the stock well below its 52-week high of about $5.04, though still up close to 18% year to date. The pullback looks less like a reaction to fresh bad news and more like investors reassessing a stock that had already rerated sharply, against a backdrop of rising rate expectations.

Macmahon (ASX:MAH): a dip, then a rebound

Macmahon is a contract mining and civil services group working across surface and underground mines in Australia and South-East Asia. Its FY26 result, also released on 18 August, delivered record revenue of $2.6 billion, underlying EBIT(A) of $190.1 million and a 47% lift in the dividend to 2.2 cents,

Despite that, the shares fell about 9% on the day to roughly $0.90. That is the one clear moment when Macmahon and Wagners retreated together, as both delivered records that did not quite satisfy a market that had priced in a lot.

Since then Macmahon has moved in the opposite direction. On 24 August it announced a $485 million, 42-month contract extension at Greatland's Telfer gold mine, which CEO Michael Finnegan called "an important milestone in our partnership" . Then on 18 September it agreed to buy Aspect Engineering Solutions, a Perth-based engineering and minerals processing services business, for an Enterprise value of $75 million. The shares rose about 8% on the news. Macmahon expects the deal to add about 6.2% to Earnings Per Share before synergies .

As of 23 September, Macmahon traded around $1.13, up about 14% for the week and roughly 70% year to date, near the top of its 52-week range, .

What links the two, and what separates them

Both are Australian industrial businesses leaning on resources and infrastructure activity, and both posted record FY26 numbers that were sold on the day. They share sensitivity to interest rates, labour costs and the pipeline of mining and infrastructure projects.

The differences matter more right now. Wagners' earnings depend heavily on South East Queensland construction and on cement input costs, where management has flagged pressure. Macmahon's fortunes are tied to miners' production plans, and a strong gold price has supported contract renewals such as Telfer. Recent company-specific news has been negative-to-neutral for Wagners and positive for Macmahon, which largely explains why their share prices have split.

What investors could watch next

RBA decision on 29 September: a rate rise could weigh on construction-linked stocks such as Wagners and on the wider market.

Macmahon AGM on 23 October 2026: a likely venue for updates on FY27 guidance, the Aspect deal and tender outcomes from its $25 billion pipeline.

Aspect completion: Macmahon expects completion during the current calendar year, subject to regulatory clearances.

Wagners' dividend and trading updates: the 5-cent dividend is payable in October, and any update on cement costs, the Caboolture concrete plant or CFT capacity will be closely read.

Commodity prices: gold and other mineral prices influence miners' appetite to extend or award contracts.

The bottom line

Macmahon and Wagners dipped together after their August results, but their paths have since diverged. Wagners has drifted lower as investors weigh cement cost pressures, a heavy Investment program and higher rate expectations against a stock that had already rallied strongly. Macmahon, by contrast, has rallied on contract wins and an earnings-accretive acquisition.