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HOS · Hornbeck Offshore Services, Inc. · Holdings

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Market Cap
$1.36B
Shares
147.38M

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Holders: 287
Total Value: $1,191,229,024
Total Shares: 136,296,250
Showing 1–100 of 291 holdings by value · page 1 of 3

Institutional Ownership Trend

26 quarters

Holder Concentration

Across 287 13F filers · Δ vs Mar 31, 2026
Top Holder
16.7%
Sep 2023 → Jun 2026 · range 16.7% – 18.8%
−0.1 pts
Top 5
38.5%
Sep 2023 → Jun 2026 · range 38.3% – 45.3%
+0.1 pts
Top 10
55.5%
Sep 2023 → Jun 2026 · range 53.7% – 58.4%
−0.4 pts
HHI
506
Sep 2023 → Jun 2026 · range 506 – 615
Broadly held−2

Quarterly Activity

vs Mar 31, 2026
New
44
Increased
114
Decreased
83
Sold Out
33
Unchanged
46
Holder count: +11
Institutional value: -8.9%
Shares held: +3.0%

Top Buyers

vs Mar 31, 2026
Institution Added Now Holds Open

Top Sellers

vs Mar 31, 2026
Institution Sold Now Holds Open

Top New Positions

vs Mar 31, 2026
Institution Acquired Value (USD) Open

Top Sold-Out Positions

vs Mar 31, 2026
Institution Previously Held Last Value (USD) Open
Showing 100 of 291
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Holder Value (USD) % of 13F Shares Open
Key facts CIK 866829 CUSIP 42330P107 13F (30d) 174 filings 174 filers Visit website Investor relations