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SPOK · Spok Holdings, Inc

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$10.31 -0.13 (-1.25%) At close · Aug 21
Market Cap
$215.67M
Shares
20.92M

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: 133
Total Value: $111,494,705
Total Shares: 10,888,162

Institutional Ownership Trend

26 quarters

Holder Concentration

Across 133 13F filers · Δ vs Mar 31, 2026
Top Holder
15.8%
Sep 2023 → Jun 2026 · range 12.8% – 16.8%
−0.2 pts
Top 5
46.4%
Sep 2023 → Jun 2026 · range 44.1% – 50.3%
−1.8 pts
Top 10
61.6%
Sep 2023 → Jun 2026 · range 61.0% – 67.6%
−1.4 pts
HHI
588
Sep 2023 → Jun 2026 · range 539 – 668
Broadly held−37

Quarterly Activity

vs Mar 31, 2026
New
21
Increased
59
Decreased
38
Sold Out
27
Unchanged
15
Holder count: -6
Institutional value: -2.5%
Shares held: +3.8%

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 133
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Holder Value (USD) % of 13F Shares Open
Key facts CIK 1289945 CUSIP 84863T106 13F (30d) 118 filings 118 filers Visit website Investor relations