Spok Holdings, Inc
SPOK- Exchange
- Nasdaq
- Industry
- Radiotelephone Communications
- SEC CIK
- 0001289945
In the last 90 days, Spok Holdings, Inc insiders filed 0 open-market purchases and 2 sales; 132 institutions reported holding it in 13F filings for Q2 2026, worth $110.9M in total; no superinvestor holds it.
Holders of 5% or more of SPOK
Holders whose latest Schedule 13D or 13G filing reports 5% or more of Spok Holdings, Inc, largest stake first. The change is against the holder's previous filing.
| Holder | Latest form | Stake | Change | First filed | Latest filing | Filing |
|---|---|---|---|---|---|---|
| Renaissance Technologies LLC | 13G | 5.13%1.06M shares | New | Aug 13, 20251 filing | Aug 13, 2025 | SEC |
Stakes are as of each holder's latest filing. Holders whose last filing was in the old format (before December 18, 2024) have no stake on record and are not listed, and after an acquisition or delisting holders usually stop filing.
13D and 13G filings
4 Schedule 13D and 13G filings on Spok Holdings, Inc, newest first, including old-format filings without a stake.
| Filed (ET) | Filer | Form | Stake | Change | Event date | Filing |
|---|---|---|---|---|---|---|
| Mar 27, 20261:17 PM ET | Vanguard Group Inc | 13G/A | 0.00%0 shares | −5.58 ppfrom 5.58%Below 5% | Mar 13, 2026 | SEC |
| Aug 13, 20254:12 PM ET | Renaissance Technologies LLCand 1 other | 13G | 5.13%1.06M shares | New | Apr 7, 2025 | SEC |
| Jul 29, 20252:32 PM ET | Vanguard Group Inc | 13G | 5.58%1.15M shares | +0.59 ppfrom 4.99% | Jun 30, 2025 | SEC |
| Apr 30, 202511:14 AM ET | Vanguard Group Inc | 13G/A | 4.99%1.02M shares | –Below 5% | Mar 31, 2025 | SEC |
Form 144: proposed insider sales
Notices from officers, directors and other affiliates planning to sell Spok Holdings, Inc shares.
No Form 144 notices for Spok Holdings, Inc are on file.