Constellium (CSTM) vs Proto Labs (PRLB)
Head-to-head comparison of performance, valuation, growth, profitability and dividends. Prices delayed 15 minutes; data as of Oct 7, 2026.
Summary
Proto Labs (PRLB) has outperformed Constellium (CSTM) over the past year, gaining 87.3% versus a gain of 65.3%. Over five years, CSTM leads with a +32.8% price change compared with +31.7% for PRLB. Constellium is the larger company by market cap ($3.45 billion vs $2.23 billion), about 1.5 times the size.
On valuation, Constellium trades at a lower forward P/E (8.6x vs 39.1x for Proto Labs).
Summary generated from market data by MetaCap's automated system. Methodology
Relative performance
Percent change in share price from the first common trading day shown; excludes dividends.
Head-to-head
| Metric | CSTM | PRLB |
|---|---|---|
| Share price | $25.42 | $93.27 |
| Market cap | $3.45B | $2.23B |
| 1-day change | -0.31% | -4.12% |
| YTD return | +34.85% | +84.36% |
| 1-year return | +65.28% | +87.25% |
| 5-year return | +32.81% | +31.70% |
| P/E ratio (TTM) | 6.57 | 74.02 |
| Forward P/E | 8.63 | 39.07 |
| EPS (TTM) | $3.87 | $1.26 |
| Dividend yield | 0.00% | 0.00% |
| Annual dividend | $0.00 | $0.00 |
| 52-week high | $36.99 | $99.96 |
| 52-week low | $14.39 | $45.10 |
| Distance from 52-week high | -31.28% | -6.69% |
| Analyst consensus | strong_buy | none |
| Avg. price target upside | +39.02% | +2.39% |
| Average volume | 1.58M | 208.80K |
| Shares outstanding | 135.53M | 23.92M |
| Employees | 11,500 | 2,280 |
| Sector | Industrials | Industrials |
| Industry | Metal Fabrications | Metal Fabrications |
Highlighted cells mark the higher value for growth, returns, margins and yield, and the lower value for P/E ratios. Highlighting is a mechanical comparison, not a recommendation.
Key differences
- PRLB has outperformed CSTM by 22.0 percentage points over the past year.
- Proto Labs trades at a higher earnings multiple (74.0x vs 6.6x trailing P/E).
About Constellium
CSTM stock →Constellium SE, together with its subsidiaries, engages in the design, manufacture, and sale of rolled and extruded aluminum products for the aerospace, packaging, automotive, commercial transportation, general industrial, and defense end-markets. It operates through three segments: Packaging & Automotive Rolled Products, Aerospace & Transportation, and Automotive Structures & Industry.
Industrials · Metal Fabrications · 11,500 employees
About Proto Labs
PRLB stock →Proto Labs, Inc., together with its subsidiaries, operates as a digital manufacturer of custom parts in the United States and Europe. It offers manufacturing services, such as molding, computer numerical control machining, 3D printing, and sheet metal to developers, engineers, and supply chain teams.
Industrials · Metal Fabrications · 2,280 employees
CSTM vs PRLB FAQ
Which is bigger, Constellium or Proto Labs?
Constellium (CSTM) is larger, with a market capitalization of $3.45B compared with $2.23B for Proto Labs (PRLB).
Which stock has performed better over the past year, CSTM or PRLB?
PRLB returned +87.25% over the past 12 months, compared with +65.28% for CSTM (price return, excluding dividends). Past performance does not predict future results.
Which has the lower P/E ratio, CSTM or PRLB?
CSTM has the lower trailing P/E at 6.6, versus 74.0 for PRLB. A lower P/E is not by itself a sign of a better investment; it can reflect slower expected growth or higher risk.
Are Constellium and Proto Labs in the same industry?
Yes. Both are classified in the Metal Fabrications industry within the Industrials sector.