Spok Holdings, Inc. (SPOK) Ownership
SPOK ownership summary
as of October 18, 2026- Institutions
- 58.0% of shares outstanding
- Insiders
- 2.32% of shares outstanding
- Shares outstanding
- 20.9M
- Float
- 18.2M shares available to trade
- Short interest
- 3.56% 691K shares short
- Days to cover
- 5.39 short interest up 1.7% vs prior month
- Institutions 58.04%
- Insiders 2.32%
- Other investors 39.64%
SPOK top institutional holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | BlackRock Inc | 8.22% | 1.7M | $18.2M | +42,992 (+2.6%) | June 30, 2026 |
| 2 | Renaissance Technologies Corp | 5.49% | 1.1M | $12.2M | −113,000 (−9.0%) | June 30, 2026 |
| 3 | Vanguard Capital Management, LLC | 4.17% | 872K | $9.3M | +12,829 (+1.5%) | June 30, 2026 |
| 4 | Dimensional Fund Advisors, Inc. | 3.43% | 718K | $7.6M | +1,747 (+0.2%) | June 30, 2026 |
| 5 | Geode Capital Management, LLC | 2.85% | 596K | $6.3M | +50,124 (+9.2%) | June 30, 2026 |
| 6 | State Street Corp | 2.25% | 472K | $5.0M | +9,794 (+2.1%) | June 30, 2026 |
| 7 | HighTower Advisors, LLC | 1.62% | 340K | $3.6M | −41,923 (−11.0%) | June 30, 2026 |
| 8 | Qube Research & Technologies | 1.38% | 288K | $3.1M | +115,560 (+67.2%) | June 30, 2026 |
| 9 | The Goldman Sachs Group Inc | 1.35% | 282K | $3.0M | +62,399 (+28.4%) | June 30, 2026 |
| 10 | Vanguard Portfolio Management, LLC | 1.31% | 273K | $2.9M | +8,250 (+3.1%) | June 30, 2026 |
| 11 | Bank of New York Mellon Corp | 1.12% | 234K | $2.5M | +16,309 (+7.5%) | June 30, 2026 |
| 12 | Northern Trust Corp | 1.07% | 223K | $2.4M | +6,352 (+2.9%) | June 30, 2026 |
| 13 | Uniplan Investment Counsel, Inc. | 1.03% | 216K | $2.3M | +6,162 (+2.9%) | June 30, 2026 |
| 14 | CSM Advisors, LLC | 1.02% | 213K | $2.3M | −220 (−0.1%) | June 30, 2026 |
| 15 | United Capital Financial Advisers Inc | 0.93% | 195K | $2.1M | +90,092 (+86.0%) | June 30, 2026 |
| 16 | Citadel Advisors Llc | 0.88% | 183K | $1.9M | +165,672 (+932.1%) | June 30, 2026 |
| 17 | Morgan Stanley - Brokerage Accounts | 0.80% | 167K | $1.8M | +6,749 (+4.2%) | June 30, 2026 |
| 18 | Jacobs Levy Equity Management, Inc. | 0.77% | 160K | $1.7M | +43,502 (+37.2%) | June 30, 2026 |
| 19 | GSA Capital Partners LLP | 0.72% | 150K | $1.6M | +64,300 (+74.9%) | June 30, 2026 |
| 20 | Vanguard Fiduciary Trust Co | 0.65% | 137K | $1.5M | +7,650 (+5.9%) | June 30, 2026 |
Value at the latest close. Change = shares bought or sold in the latest quarterly filing (13F). In the top 20, 17 holders added 710K shares and 3 cut 155K.
SPOK top mutual fund and ETF holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | Vanguard MStar Total Stk Mkt Idx Invest | 2.94% | 615K | $6.5M | — | August 31, 2026 |
| 2 | iShares Russell 2000 ETF | 2.43% | 508K | $5.4M | −5,888 (−1.1%) | September 30, 2026 |
| 3 | Fidelity Small Cap Index | 1.22% | 255K | $2.7M | +1,582 (+0.6%) | July 31, 2026 |
| 4 | iShares Russell 2000 Value ETF | 0.91% | 190K | $2.0M | +288 (+0.2%) | September 30, 2026 |
| 5 | Vanguard Russell 2000 ETF | 0.58% | 122K | $1.3M | +1,537 (+1.3%) | September 30, 2026 |
| 6 | Fidelity Extended Market Index | 0.56% | 117K | $1.2M | +809 (+0.7%) | August 31, 2026 |
| 7 | WisdomTree US SmallCap Dividend ETF | 0.56% | 116K | $1.2M | — | September 30, 2026 |
| 8 | BSF Systematic US Eq Abs Ret A2 USD | 0.55% | 115K | $1.2M | — | December 31, 2025 |
| 9 | DFA US Targeted Value I | 0.53% | 111K | $1.2M | — | August 31, 2026 |
| 10 | DFA US Small Cap I | 0.44% | 92K | $974,401 | — | August 31, 2026 |
| 11 | North Star Dividend I | 0.43% | 90K | $954,900 | — | September 30, 2026 |
| 12 | Dimensional US Targeted Value ETF | 0.40% | 84K | $887,176 | — | September 30, 2026 |
| 13 | Vanguard Communication Services ETF | 0.38% | 78K | $832,354 | +2,714 (+3.6%) | September 30, 2026 |
| 14 | VictoryShares Small Cap Fr CA Flw ETF | 0.37% | 78K | $823,177 | — | September 30, 2026 |
| 15 | Goldman Sachs Small Cp Val Insghts Instl | 0.36% | 75K | $791,718 | +74,620 (0.0%) | July 31, 2026 |
| 16 | DFA US Micro Cap I | 0.34% | 72K | $761,840 | — | August 31, 2026 |
| 17 | iShares Micro-Cap ETF | 0.32% | 68K | $719,337 | −468 (−0.7%) | September 30, 2026 |
| 18 | DFA US Small Cap Value I | 0.28% | 58K | $611,804 | — | August 31, 2026 |
| 19 | Fidelity VIP Disciplined Small Cap Init | 0.26% | 54K | $571,391 | +37,428 (+227.9%) | July 31, 2026 |
| 20 | Schwab Small Cap Index | 0.25% | 53K | $562,627 | — | August 31, 2026 |
Funds report holdings monthly or quarterly; dates differ by fund.
SPOK insider transactions
latest 4| Date | Name | Transaction | Price | Shares | Value |
|---|---|---|---|---|---|
| 2025-08-25 | Michael W Wallace | Sell | $17.87 | 10,806 | $193,103 |
| 2025-08-21 | Vincent D Kelly | Sell | $17.69 | 25,000 | $442,250 |
| 2025-05-07 | Michael W Wallace | Sell | $16.53 | 6,000 | $99,180 |
| 2025-05-06 | Vincent D Kelly | Sell | $16.40 | 30,000 | $492,000 |
Reported trades by company officers, directors and other filers (including disclosures by members of Congress where EODHD lists them). "—" where the filing gives no share count.
SPOK shares outstanding
Year-end shares outstanding, adjusted for splits.
Who owns SPOK
Institutional investors own 58.0% of Spok's shares and insiders 2.32%. The largest holder is BlackRock Inc with 8.22% of the shares (1.7M), as of June 30, 2026. Among the top 20 institutions, 17 added shares and 3 reduced their stake in the latest filings. Short interest is 3.56% of the float, or 5.39 days of average trading volume. The share count fell 4.7% since 2014.
Related: SPOK analyst forecast, SPOK key metrics, SPOK dividend history. See the SPOK stock overview for the latest quote and news.
SPOK ownership FAQ
Who owns the most Spok stock?
The largest shareholders of Spok are BlackRock Inc (8.22%), Renaissance Technologies Corp (5.49%), Vanguard Capital Management, LLC (4.17%), Dimensional Fund Advisors, Inc. (3.43%), Geode Capital Management, LLC (2.85%).
What percentage of Spok is owned by institutions?
Institutions hold 58.0% of Spok's shares outstanding; insiders hold 2.32%.
Which funds own Spok?
The largest fund holders of Spok are Vanguard MStar Total Stk Mkt Idx Invest (2.94%), iShares Russell 2000 ETF (2.43%), Fidelity Small Cap Index (1.22%), iShares Russell 2000 Value ETF (0.91%), Vanguard Russell 2000 ETF (0.58%).
What is Spok's short interest?
691K shares of Spok were sold short, 3.56% of the float; at the average daily volume it would take 5.39 days to cover.
Are insiders buying or selling Spok?
Of the latest 4 reported insider transactions in Spok (since May 6, 2025), 0 were purchases and 4 were sales.
How many shares of Spok are outstanding?
Spok has 20.9M shares outstanding, of which 18.2M are in the public float.