Administaff Inc de

-

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Administaff Inc de
TickerNSP
CIK #0001000753
CUSIP45778Q107
SectorTrade & Services - Services-Help Supply Services
Address19001 Crescent Springs Dr, Kingwood, TX 77339
Source [EDGAR]
CIK Filing 2011 - 2026
[0001000753] 10-K
[0001000753] 10-Q
[0001000753] 3
[0001000753] 4
[0001000753] 5
[0001000753] 8-K
[0001000753] SC 13D
[0001000753] SC 13G
Form 13D/13G Filer Form 13D/13G Subject Filed % Owned
Earnest Partners LLC Insperity Inc [2026-05-15] 0.0
Invesco Ltd Insperity Inc [2026-05-06] 0.0
Vanguard Portfolio Management LLC Insperity Inc [2026-04-29] 0.0
Reinhart Partners LLC Insperity Inc [2025-11-04] 0.0
FMR LLC Insperity Inc [2021-02-08] 0.0
Mawer Investment Management Ltd Insperity Inc [2021-02-05] 5.62
Stadium Capital Management LLC Insperity Inc [2015-03-24] 5.8
Starboard Value LP Insperity Inc [2015-01-20] 13.2
Stadium Capital Management LLC Insperity Inc [2014-03-27] 0.1
Vulcan Value Partners LLC Insperity Inc [2014-02-10] 6.25
Columbia Wanger Asset Management LLC Insperity Inc [2013-02-14] 7.7
Vanguard Group Inc Insperity Inc [2013-02-13] 5.12
Parnassus Investments /CA Insperity Inc [2013-02-08] 6.1
Stadium Capital Management LLC Insperity Inc [2012-05-25] 7.1
Form 3/4/5 Filer 2011 - 2026
Sarvadi Paul J
Insperity Inc
Ramchand Latha
Mehl Randall
Masterson Ellen H
Morphy John M
Wilmington Philip W
Kaufman Carol R
Jones Eli
Clifford Tim
Rawson Richard G
Lumelleau John L
Callens Christian P
Allison James D
Duffy Sean Patrick
Arizpe Arthur A
Sharp Douglas S
Herink Daniel D
Mincks Jay E
Young Austin P
Michelle McKenna
Feld Peter A
Sorensen Norman R
Brown Michael W
Fields Jack M Jr
Lattanzio Paul S
Starboard Value & Opportunity Master Fund Ltd
Starboard Value GP LLC
Starboard Value & Opportunity C LP
Starboard Value LP
Starboard Value R LP
Starboard Principal Co GP LLC
Starboard Value & Opportunity S LLC
Starboard Principal Co LP
Starboard Value R GP LLC
Mitchell Mark R
Smith Jeffrey C
Traub Kenneth
Petsch Gregory E
Insider Transaction (Form 3/4/5) Date Action Shares Price Value ($)
Sarvadi Paul J
Common Stock
2026-03-19 Buy 22,991 $23.57 541,898
Sarvadi Paul J
Common Stock
2026-03-19 Buy 2,009 $23.93 48,075
Sarvadi Paul J
Common Stock
2026-03-18 Buy 160,000 $23.22 3,715,200
Sarvadi Paul J
Common Stock
2026-03-17 Buy 14,987 $22.53 337,657
Sarvadi Paul J
Common Stock
2026-03-17 Buy 2,000 $22.98 45,960
Masterson Ellen H
Common Stock
2026-03-11 Buy 1,200 $19.90 23,880
Callens Christian P
Common Stock
2026-03-11 Buy 1,250 $19.28 24,100
Allison James D
Common Stock
2026-03-10 Buy 10,000 $20.45 204,500
Sarvadi Paul J
Common Stock
2026-03-03 Tax withheld 2,057 $21.13 43,464
Sarvadi Paul J
Common Stock
2026-03-03 Grant 1,384 $0.00
Arizpe Arthur A
Common Stock
2026-03-03 Tax withheld 282 $21.13 5,959
Arizpe Arthur A
Common Stock
2026-03-03 Grant 319 $0.00
Allison James D
Common Stock
2026-03-03 Grant 154 $0.00
Allison James D
Common Stock
2026-03-03 Tax withheld 151 $21.13 3,191
Sarvadi Paul J
Common Stock
2026-03-02 Grant 33,835 $0.00
Sarvadi Paul J
Common Stock
2026-03-02 Tax withheld 9,215 $22.21 204,665
Duffy Sean Patrick
Common Stock
2026-03-02 Grant 151 $0.00
Arizpe Arthur A
Common Stock
2026-03-02 Grant 13,200 $0.00
Callens Christian P
Common Stock
2026-03-02 Grant 248 $0.00
Allison James D
Common Stock
2026-03-02 Grant 20,535 $0.00
showing 20 of 200 most recent transactions
13F Ownership Over TimeHoldersShares Held
2026-03-31 255 41,667,546
2025-12-31 268 39,623,970
2025-09-30 278 37,384,059
2025-06-30 287 36,899,287
2025-03-31 319 36,238,490
2024-12-31 288 35,670,136
2024-09-30 310 35,237,664
2024-06-30 328 35,167,697
2024-03-31 324 35,655,246
2023-12-31 338 34,192,658
2023-09-30 329 32,927,455
2023-06-30 335 33,903,854
Form 13F Holdings
Firm Period DFND Voting Shares
Reinhart Partners LLC [2026-06-30] SOLE 2,992,994 3,304,074
Y-Intercept Hong Kong Ltd [2026-06-30] SOLE 74,900 74,900
Wealth Enhancement Advisory Services LLC [2026-06-30] SOLE 1,280 33,517
Woodstock Corp [2026-06-30] SOLE 27,354 27,354
Legacy Wealth Asset Management LLC [2026-06-30] SOLE 16,822 16,822
Louisiana State Employees Retirement System [2026-06-30] SOLE 15,900 15,900
Fulton Bank NA [2026-06-30] SOLE 14,407 14,407
Alaska Retirement Management Board [2026-06-30] SOLE 14,223 14,223
Intergy Private Wealth LLC [2026-06-30] SOLE 0 12,165
Yousif Capital Management LLC [2026-06-30] SOLE 2,308 9,726
Commonwealth of Pennsylvania Public School Empls Retrmt SYS [2026-06-30] SOLE 8,599 8,599
NorthCrest Asset Manangement LLC [2026-06-30] SOLE 351 8,459
Merit Financial Group LLC [2026-06-30] OTR 0 7,897
Steel Peak Wealth Management LLC [2026-06-30] SOLE 333 7,038
Gamma Investing LLC [2026-06-30] DFND 6,192 6,192
Versant Capital Management Inc [2026-06-30] SOLE 3,543 3,543
Farther Finance Advisors LLC [2026-06-30] SOLE 0 1,100
Merit Financial Group LLC [2026-06-30] SOLE 0 1,029
True Wealth Design LLC [2026-06-30] SOLE 0 362
Trust Co of Toledo NA /OH/ [2026-06-30] SOLE 324 324
MassMutual Private Wealth & Trust FSB [2026-06-30] SOLE 279 279
Owl Creek Wealth Partners LLC [2026-06-30] SOLE 0 240
Allied Private Wealth LLC [2026-06-30] SOLE 200 200
Salem Investment Counselors Inc [2026-06-30] SOLE 168 168
GHP Investment Advisors Inc [2026-06-30] SOLE 0 166
Fortitude Family Office LLC [2026-06-30] SOLE 105 105
Spire Wealth Management [2026-06-30] SOLE 0 63
IFP Advisors LLC [2026-06-30] SOLE 43 43
Cedar Mountain Advisors LLC [2026-06-30] SOLE 0 19
Farmers & Merchants Investments Inc [2026-06-30] SOLE 15 15
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