SEC Filing Analysis: Great Lakes Dredge & Dock Corp

Executive Summary

• Trading Significance: High
• Key Takeaway: BlackRock, Inc. reports a 10.0% beneficial ownership stake, confirming its position as a major institutional holder.
• Market Impact: Neutral to Bullish. While 13G filings indicate passive intent, a 10% stake demonstrates high conviction from the world's largest asset manager.

Company Information

Field	Value
Company	Great Lakes Dredge & Dock Corp
CIK	0001372020
Industry	Heavy Construction

Insider Information

Field	Value
Name	BlackRock, Inc.
CIK	0002012383
Relationship	10% Owner (Institutional)

Transaction Details

Field	Value
Form Type	SCHEDULE 13G/A (Amendment #16)
Filing Date	2026/03/04
Security Type	Common Stock
Shares Owned	6,701,811
Ownership %	10.0%
Voting Power	6,585,493 (Sole)

Financial Impact Assessment

Transaction Materiality

Metric	Value
Shares Owned	6,701,811
% of Shares Outstanding	10.0% (per filing)
Materiality Assessment	Highly Significant

Impact Evaluation

• Ownership Concentration: BlackRock controls 10.0% of the company's class, a highly concentrated position that gives them significant sway despite passive intent.
• Dilution Impact: N/A (Secondary market holdings, not a new issuance).
• Transaction Significance: The maintenance of a stake exceeding 10% is statistically significant. It places BlackRock among the top shareholders of the entity.

Market Impact Analysis

Stock Impact Prediction

• Direction: Neutral/Positive
• Reasoning: Continued holding of a 10% stake by a major institution like BlackRock provides a floor of stability for the stock. It suggests the asset manager sees value in maintaining a heavy weight in the portfolio relative to the company's size.

Volume & Sentiment

• Expected Volume Impact: Low. This is a reporting of existing holdings (Amendment #16), not a real-time trade alert.
• Sentiment Indicator: Bullish. High institutional ownership is generally a quality factor for small/mid-cap industrial stocks.

Investment Insights

Positive Market Indicators

• High Conviction: 10% ownership is the upper echelon of institutional position sizing.
• Stability: Long-term holding (Amendment #16 implies they have held this for years).

Key Takeaways

1. BlackRock owns 1 out of every 10 shares of Great Lakes Dredge & Dock.
2. The filing is a Schedule 13G, indicating the shares are held in the ordinary course of business without the intent to change or influence control.
3. Sole dispositive power over 6.7M shares indicates full control over the decision to sell or hold these assets.

Additional Context

Transaction Notes

• Regulatory Threshold: Crossing or maintaining the 10% threshold triggers specific reporting requirements and indicates BlackRock is a statutory insider for Section 16 purposes (though 13G filers often have exemptions).
• Subsidiaries: The holding is aggregated across multiple BlackRock subsidiaries including BlackRock Fund Advisors and BlackRock Institutional Trust Company.