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Equibles

SPOK

Spok Holdings, Inc

Company with tickers: SPOK

CIK
1289945
CUSIP
84863T106
Shares Outstanding
20,887,010
13F Activity (30d)
113 filings 108 filers

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: 138
Total Value: $114,336,712
Total Shares: 10,489,614
Showing 1–100 of 138 holdings by value · page 1 of 2

Institutional Ownership Trend

25 quarters

Holder Concentration

Across 138 13F filers · Δ vs Dec 31, 2025
Top Holder
16.0%
Jun 2023 → Mar 2026 · range 11.5% – 16.8%
−0.2 pts
Top 5
48.2%
Jun 2023 → Mar 2026 · range 44.1% – 50.3%
−2.1 pts
Top 10
63.0%
Jun 2023 → Mar 2026 · range 61.0% – 67.6%
−3.3 pts
HHI
625
Jun 2023 → Mar 2026 · range 539 – 668
Broadly held −43

Quarterly Activity

vs Dec 31, 2025
New
23
Increased
45
Decreased
53
Sold Out
19
Unchanged
17
Holder count: +4
Institutional value: -21.9%
Shares held: -5.4%

Top Buyers

vs Dec 31, 2025
Institution Added Now Holds Open
Mega JANE STREET GROUP, LLC +72,760 86,524
Large Point72 Asset Management, L.P. +70,902 89,627
Small Uniplan Investment Counsel, Inc. +48,605 209,602
Mid GSA CAPITAL PARTNERS LLP +45,796 85,824
Mid Engineers Gate Manager LP +27,712 64,068

Top Sellers

vs Dec 31, 2025
Institution Sold Now Holds Open
Mega GOLDMAN SACHS GROUP INC −142,890 219,581
Mega BlackRock, Inc. −123,322 1,676,227
Mega FMR LLC −111,953 15,029
Mega MILLENNIUM MANAGEMENT LLC −88,653 37,155
Large Quantinno Capital Management LP −66,576 26,150

Top New Positions

vs Dec 31, 2025
Institution Acquired Value (USD) Open
Mega VANGUARD CAPITAL MANAGEMENT LLC 859,530 $9,368,877
Mega VANGUARD PORTFOLIO MANAGEMENT LLC 265,028 $2,888,805
Mega VANGUARD FIDUCIARY TRUST CO 129,248 $1,408,803
Large MARSHALL WACE, LLP 112,789 $1,229,399
Mid UNITED CAPITAL FINANCIAL ADVISORS, LLC 104,723 $1,141,480

Top Sold-Out Positions

vs Dec 31, 2025
Institution Previously Held Last Value (USD) Open
Mega VANGUARD GROUP INC 1,229,078 $16,211,537
Large ACADIAN ASSET MANAGEMENT LLC 322,043 $4,247,747
Large LOS ANGELES CAPITAL MANAGEMENT LLC 102,021 $1,345,656
Large TWO SIGMA ADVISERS, LP 42,072 $554,929
Large STATE BOARD OF ADMINISTRATION OF FLORIDA RETIREMENT SYSTEM 22,698 $299,386
Filter: New 23 Increased 45 Reduced 53 Sold out 19 Unchanged 17
Showing 100 of 138
All Common Calls Puts
Export CSV
Holder Value (USD) % of 13F Shares Open
Mega BlackRock, Inc. $18,270,871 15.98% 1,676,227
Large RENAISSANCE TECHNOLOGIES LLC $13,751,211 12.03% 1,261,579
Mega VANGUARD CAPITAL MANAGEMENT LLC $9,368,877 8.19% 859,530
Mega DIMENSIONAL FUND ADVISORS LP $7,802,970 6.82% 715,869
Mega GEODE CAPITAL MANAGEMENT, LLC $5,948,325 5.20% 545,718
Mega STATE STREET CORP $5,033,511 4.40% 461,790
Large HighTower Advisors, LLC $4,161,783 3.64% 381,815
Mega VANGUARD PORTFOLIO MANAGEMENT LLC $2,888,805 2.53% 265,028
Mega GOLDMAN SACHS GROUP INC $2,393,432 2.09% 219,581
Mega Bank of New York Mellon Corp Bank $2,374,051 2.08% 217,803
Mega NORTHERN TRUST CORP Bank $2,360,317 2.06% 216,543
Mid CSM Advisors, LLC $2,323,117 2.03% 213,130
Small Uniplan Investment Counsel, Inc. $2,284,661 2.00% 209,602
Large Qube Research & Technologies Ltd $1,875,421 1.64% 172,057
Mega MORGAN STANLEY $1,742,100 1.52% 159,826
Large Connor, Clark & Lunn Investment Management Ltd. $1,578,875 1.38% 144,851
Mega VANGUARD FIDUCIARY TRUST CO Bank $1,408,803 1.23% 129,248
Large Trexquant Investment LP $1,404,530 1.23% 128,856
Mid North Star Investment Management Corp. $1,329,800 1.16% 122,000
Large JACOBS LEVY EQUITY MANAGEMENT, INC $1,273,229 1.11% 116,810
Large MARSHALL WACE, LLP $1,229,399 1.08% 112,789
Mid UNITED CAPITAL FINANCIAL ADVISORS, LLC $1,141,480 1.00% 104,723
Large Point72 Asset Management, L.P. $976,934 0.85% 89,627
Mega D. E. Shaw & Co., Inc. $975,015 0.85% 89,451
Mega JANE STREET GROUP, LLC $943,111 0.82% 86,524
Mid GSA CAPITAL PARTNERS LLP $935,481 0.82% 85,824
Large PANAGORA ASSET MANAGEMENT INC $853,415 0.75% 78,295
Small FIDELIS CAPITAL PARTNERS, LLC $817,510 0.72% 75,001
Mega Nuveen, LLC $799,361 0.70% 73,336
Mega JPMORGAN CHASE & CO $759,652 0.66% 69,693
Small Numerai GP LLC $752,274 0.66% 69,016
Mega FIRST TRUST ADVISORS LP $713,928 0.62% 65,498
Mid Engineers Gate Manager LP $698,341 0.61% 64,068
Mega CHARLES SCHWAB INVESTMENT MANAGEMENT INC $610,781 0.53% 56,035
Mid Campbell & CO Investment Adviser LLC $554,472 0.48% 50,869
Small Keebeck Wealth Management $545,000 0.48% 50,000
Large Man Group plc $526,742 0.46% 48,325
Mega AMERICAN CENTURY COMPANIES INC $472,711 0.41% 43,368
Mega AQR CAPITAL MANAGEMENT LLC $470,137 0.41% 43,132
Mega VICTORY CAPITAL MANAGEMENT INC $466,694 0.41% 42,816
Mega HSBC HOLDINGS PLC $452,339 0.40% 41,499
Small Dynamic Technology Lab Private Ltd $409,229 0.36% 37,544
Mega MILLENNIUM MANAGEMENT LLC $404,989 0.35% 37,155
Mega RHUMBLINE ADVISERS $340,014 0.30% 31,194
Mega Invesco Ltd. $332,175 0.29% 30,475
Mega UBS Group AG $316,296 0.28% 29,018
Mega ALLIANCEBERNSTEIN L.P. $306,944 0.27% 28,160
Mid BRIDGEWAY CAPITAL MANAGEMENT, LLC $289,940 0.25% 26,600
Mega BANK OF AMERICA CORP /DE/ Bank $289,155 0.25% 26,528
Large Quantinno Capital Management LP $285,035 0.25% 26,150
Mid MARTINGALE ASSET MANAGEMENT L P $250,972 0.22% 23,025
Large STATE OF WISCONSIN INVESTMENT BOARD $221,270 0.19% 20,300
Mega TWO SIGMA INVESTMENTS, LP $216,910 0.19% 19,900
Mid Cambria Investment Management, L.P. $215,209 0.19% 19,744
Mega WELLS FARGO & COMPANY/MN $207,001 0.18% 18,991
Mid OCCUDO QUANTITATIVE STRATEGIES LP $206,533 0.18% 18,948
Mid Hennion & Walsh Asset Management, Inc. $203,906 0.18% 18,707
Mega DEUTSCHE BANK AG\ Bank $195,916 0.17% 17,974
Mega CITADEL ADVISORS LLC $193,746 0.17% 17,775
Mid Aquatic Capital Management LLC $189,027 0.17% 17,342
Mega AMERIPRISE FINANCIAL INC $184,002 0.16% 16,881
Micro Significant Wealth Partners LLC $181,844 0.16% 16,683
Mega BARCLAYS PLC $166,987 0.15% 15,320
Large Empowered Funds, LLC $165,712 0.14% 15,203
Mega CANADA PENSION PLAN INVESTMENT BOARD Pension $165,680 0.14% 15,200
Mega FMR LLC $163,815 0.14% 15,029
Small EntryPoint Capital, LLC $161,865 0.14% 14,850
Mega PRICE T ROWE ASSOCIATES INC /MD/ $161,221 0.14% 14,791
Mid Magnetar Financial LLC $151,553 0.13% 13,904
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP $142,397 0.12% 13,064
Large Squarepoint Ops LLC $136,042 0.12% 12,481
Small Brady Martz Wealth Solutions, LLC $133,198 0.12% 12,220
Mid Focus Partners Advisor Solutions, LLC $132,009 0.12% 12,111
Mid Quadrature Capital Ltd $123,900 0.11% 11,367
Large PUBLIC EMPLOYEES RETIREMENT SYSTEM OF OHIO Pension $116,335 0.10% 10,673
Large Grantham, Mayo, Van Otterloo & Co. LLC $114,155 0.10% 10,473
Small AXQ CAPITAL, LP $112,084 0.10% 10,283
Small Redhawk Wealth Advisors, Inc. $110,460 0.10% 10,134
Small OXFORD ASSET MANAGEMENT LLP $109,218 0.10% 10,020
Small State of Wyoming $109,141 0.10% 10,013
Large MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. Mutual Fund $105,544 0.09% 9,683
Mega Vanguard Global Advisers, LLC $97,958 0.09% 8,987
Large Russell Investments Group, Ltd. $85,575 0.07% 7,851
Small VIRTUS ADVISERS, LLC $77,662 0.07% 7,125
Small Truvestments Capital LLC $76,452 0.07% 7,014
Large Police & Firemen's Retirement System of New Jersey Pension $71,907 0.06% 6,597
Large MetLife Investment Management, LLC $70,544 0.06% 6,472
Large CWM, LLC $64,026 0.06% 5,874
Mid New Age Alpha Advisors, LLC $63,819 0.06% 5,855
Small Triumph Capital Management $59,960 0.05% 5,501
Mega BNP PARIBAS ARBITRAGE, SA $47,840 0.04% 4,389
Mid Tower Research Capital LLC (TRC) $45,431 0.04% 4,168
Mega Legal & General Group Plc $43,097 0.04% 3,954
Large Rockefeller Capital Management L.P. $29,909 0.03% 2,744
Large CANADA LIFE ASSURANCE Co Insurance $27,958 0.02% 2,565
Mid Ameritas Investment Partners, Inc. $22,672 0.02% 2,080
Mid Larson Financial Group LLC $21,800 0.02% 2,000
Mid SBI Securities Co., Ltd. Broker-Dealer $20,263 0.02% 1,859
Mega CITIGROUP INC $17,733 0.02% 1,627
Large CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM Pension $12,011 0.01% 1,102

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