SEC ownership of INNOVATIVE SOLUTIONS & SUPPORT INC

Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0000836690.

Holder evidence

50

Lead holder

Kevin P. Gilboy

13D/G signal

Kevin P. Gilboy

Latest evidence

31 Mar 2026

Top shareholders Insider holders Latest transactions
Issuer identity 3 facts
CIK
0000836690
Symbol
ISSC on Nasdaq
Location
Exton, PA
Ownership snapshot 4 facts
SEC evidence mix
13D/G, 3/4/5, and 13F
Lead holder
Kevin P. Gilboy
Latest large-stake holder
Kevin P. Gilboy
Latest evidence date
31 Mar 2026

Ownership snapshot

Top shareholders of INNOVATIVE SOLUTIONS & SUPPORT INC (13F + 13D/G + 3/4/5)

Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.

Lead holder
Kevin P. Gilboy
13D/G signal
Kevin P. Gilboy
Evidence rows
50
Latest as of
31 Mar 2026
13D/G 3/4/5 13F Lead comparable stake: 3.8% 13D/G row: Kevin P. Gilboy Showing 1-8 of 50 holder rows.
Holder Evidence Ownership % Position 12M Net Δ As of
Kevin P. Gilboy
13D/G
13D/G
3.8%
$3,798,967
664,155 shares
 $0 02 Dec 2024
Christopher Harborne
3/4/5
10%+ Owner
3/4/5
9.1%
$21,674,046
1,583,411 shares
 -$9,102,064 27 Jun 2025
MARSHALL WACE, LLP
13F
Company
13F
4.3%
$15,466,831
753,377 shares
 — 31 Mar 2026
VANGUARD CAPITAL MANAGEMENT LLC
13F
Company
13F
3.6%
$12,847,161
625,775 shares
 — 31 Mar 2026
MORGAN STANLEY
13F
Company
13F
3.5%
$12,384,674
603,247 shares
 — 31 Mar 2026
PUNCH & ASSOCIATES INVESTMENT MANAGEMENT, INC.
13F
Company
13F
3%
$10,647,228
518,618 shares
 — 31 Mar 2026
DIMENSIONAL FUND ADVISORS LP
13F
Company
13F
2.1%
$7,557,617
368,267 shares
 — 31 Mar 2026
DRIEHAUS CAPITAL MANAGEMENT LLC
13F
Company
13F
2%
$7,146,555
348,103 shares
 — 31 Mar 2026
How to read this table

Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.

Forms 3/4/5 flow

Insider trading overview

Net insider flow leans to selling over the last 12 months. Net value: -$9,102,064.

Buys
$0
Insiders: 0
Sells
$9,102,064
Insiders: 1
Net
-$9,102,064
Shares: -713,234
Window
Last 12 months
4 rolling buckets
Buy value Sell value
Shares: 0 Shares: 713,234
Window (months) Buy shares Sell shares Buy value Sell value Net value
0-3 0 0 $0 $0 $0
3-6 0 0 $0 $0 $0
6-9 0 0 $0 $0 $0
9-12 0 713,234 $0 $9,102,064 -$9,102,064

Reporting owners

Insider holders from Forms 3/4/5

Showing 1-15 of 15 reporting-owner rows connected to INNOVATIVE SOLUTIONS & SUPPORT INC. Open a relationship link for the CIK-to-CIK filing trail.

Rows
15
Lead holder
Christopher Harborne
Net 12M change
-$9,102,064
Latest report
20 May 2026
Name Relationship Holdings Value Past Year Net Change Change % Valuation Report Date
Christopher Harborne 10%+ Owner $21,674,046 -$9,102,064 -30% Filing P/S 27 Jun 2025
Shahram Askarpour Chief Executive Officer $13,068,834 Mixed 18 May 2026
Of Geoffrey S. M. Hedrick Estate 10%+ Owner $12,964,373 Mixed 09 Aug 2023
Glen R. Bressner Director $3,964,324 Mixed 20 May 2026
Jeffrey DiGiovanni Chief Financial Officer $2,468,497 Mixed 18 May 2026
Robert E. Mittelstaedt Jr. Former Director $973,054 Mixed 14 Jun 2022
Roger A. Carolin Director $502,456 Mixed 16 Apr 2026
Stephen L. Belland Director $183,652 Mixed 16 Apr 2026
Parizad Olver Director $146,529 Mixed 13 Apr 2024
Garry C. Dean Director $80,460 Mixed 16 Apr 2026
Winston J. Churchill Former Director $74,724 Mixed 13 Jun 2023
Denise L. Devine Director $53,208 Mixed 16 Apr 2026
Michael Linacre Chief Financial Officer $47,724 Mixed 21 Aug 2023
Relland M. Winand Interim CFO Mixed 09 Nov 2023
Richard A. Silfen Director Mixed 16 Apr 2026

Recent insider transactions for INNOVATIVE SOLUTIONS & SUPPORT INC

Showing up to 300 recent insider transactions from the last 12 months.

Insider Symbol Class Transaction % Reported value Reported price Shares Shares owned Date Ownership
Glen R. Bressner ISSC Common Stock Award 4.28% 6,300 153,655 20 May 2026 Direct
Shahram Askarpour ISSC Common Stock Tax liability -0.18% -906 495,035 18 May 2026 Direct
Jeffrey DiGiovanni ISSC Common Stock Tax liability -0.54% -474 87,897 18 May 2026 Direct
Denise L. Devine ISSC Restricted Stock Units Award 37.4% 5,618 20,622 16 Apr 2026 Direct
Denise L. Devine ISSC Restricted Stock Units Disposed to Issuer -26.5% -5,403 15,004 16 Apr 2026 Direct
Garry C. Dean ISSC Restricted Stock Units Award 23.6% 5,618 29,408 16 Apr 2026 Direct
Richard A. Silfen ISSC Restricted Stock Units Award 297.2% 5,618 7,508 16 Apr 2026 Direct
Roger Anthony Carolin ISSC Restricted Stock Units Award 7.24% 5,618 83,188 16 Apr 2026 Direct
Glen R. Bressner ISSC Restricted Stock Units Award 3.96% 5,618 147,355 16 Apr 2026 Direct
Stephen L. Belland ISSC Restricted Stock Units Award 15.2% 5,618 42,559 16 Apr 2026 Direct
Jeffrey DiGiovanni ISSC Common Stock Tax liability -0.86% -765 88,371 08 Apr 2026 Direct
Jeffrey DiGiovanni ISSC Common Stock Tax liability -1% -897 89,136 31 Mar 2026 Direct
Shahram Askarpour ISSC Common Stock Tax liability -0.58% -2,876 495,941 22 Feb 2026 Direct
Shahram Askarpour ISSC Common Stock Tax liability -0.72% -3,625 498,817 18 Feb 2026 Direct
Jeffrey DiGiovanni ISSC Common Stock Tax liability -2.36% -2,172 90,033 18 Feb 2026 Direct
Jeffrey DiGiovanni ISSC Restricted Stock units Award 11.4% 9,455 92,205 17 Feb 2026 Direct
Jeffrey DiGiovanni ISSC Performance Stock Units Award 21,307 21,307 17 Feb 2026 Direct
Jeffrey DiGiovanni ISSC Non-Qualified Stock Option (Right to Buy) Award 16,108 16,108 17 Feb 2026 Direct
Shahram Askarpour ISSC Restricted Stock Units Award 4.18% 20,171 502,442 17 Feb 2026 Direct
Shahram Askarpour ISSC Performance Stock Units Award 45,455 45,455 17 Feb 2026 Direct
Shahram Askarpour ISSC Non-Qualified Stock Option (Right to Buy) Award 34,364 34,364 17 Feb 2026 Direct
Richard A. Silfen ISSC Restricted Stock Units Award 1,890 1,890 17 Feb 2026 Direct
Jeffrey DiGiovanni ISSC Common Stock Tax liability -1.04% -868 82,750 13 Jan 2026 Direct
Shahram Askarpour ISSC Common Stock Tax liability -0.44% -2,128 482,271 11 Jan 2026 Direct
Jeffrey DiGiovanni ISSC Common Stock Tax liability -1.18% -1,000 83,618 31 Dec 2025 Direct
Shahram Askarpour ISSC Common Stock Tax liability -15.4% -87,918 484,399 20 Nov 2025 Direct
Shahram Askarpour ISSC Common Stock Options Exercise 54.1% 201,000 572,317 20 Nov 2025 Direct
Shahram Askarpour ISSC Performance Stock Units Options Exercise -100% -201,000 0 20 Nov 2025 Direct
Christopher Harborne ISSC Common Stock, par value $0.001 per share Sale -8.39% $1,984,912 $13.69 -145,009 1,583,411 30 Jun 2025 See Footnote
Christopher Harborne ISSC Common Stock, par value $0.001 per share Sale -4.03% $991,605 $13.68 -72,499 1,728,420 27 Jun 2025 See Footnote
Christopher Harborne ISSC Common Stock, par value $0.001 per share Sale -3.21% $788,213 $13.21 -59,667 1,800,919 26 Jun 2025 See Footnote
Christopher Harborne ISSC Common Stock, par value $0.001 per share Sale -4.65% $1,171,417 $12.92 -90,655 1,860,586 25 Jun 2025 See Footnote
Christopher Harborne ISSC Common Stock, par value $0.001 per share Sale -4.38% $1,117,246 $12.50 -89,414 1,951,241 23 Jun 2025 See Footnote
Christopher Harborne ISSC Common Stock, par value $0.001 per share Sale -1.54% $391,424 $12.25 -31,953 2,040,655 20 Jun 2025 See Footnote
Christopher Harborne ISSC Common Stock, par value $0.001 per share Sale -0.82% $211,117 $12.28 -17,198 2,072,608 18 Jun 2025 See Footnote
Christopher Harborne ISSC Common Stock, par value $0.001 per share Sale -1.03% $278,536 $12.77 -21,809 2,089,806 17 Jun 2025 See Footnote
Christopher Harborne ISSC Common Stock, par value $0.001 per share Sale -0.24% $60,217 $11.77 -5,116 2,111,615 11 Jun 2025 See Footnote
Christopher Harborne ISSC Common Stock, par value $0.001 per share Sale -0.02% $5,146 $11.75 -438 2,116,731 10 Jun 2025 See Footnote
Christopher Harborne ISSC Common Stock, par value $0.001 per share Sale -2.92% $749,247 $11.78 -63,592 2,117,169 09 Jun 2025 See Footnote
Christopher Harborne ISSC Common Stock, par value $0.001 per share Sale -1.6% $416,739 $11.76 -35,437 2,180,761 06 Jun 2025 See Footnote
Christopher Harborne ISSC Common Stock, par value $0.001 per share Sale -0.54% $140,844 $11.79 -11,944 2,216,198 05 Jun 2025 See Footnote
Christopher Harborne ISSC Common Stock, par value $0.001 per share Sale -1.94% $513,353 $11.67 -43,997 2,228,142 04 Jun 2025 See Footnote
Christopher Harborne ISSC Common Stock, par value $0.001 per share Sale -0.3% $77,814 $11.50 -6,766 2,272,139 03 Jun 2025 See Footnote
Christopher Harborne ISSC Common Stock, par value $0.001 per share Sale -0.77% $204,234 $11.51 -17,740 2,278,905 02 Jun 2025 See Footnote
* indicates a reported price that failed the local validity check.
We use cookies and similar technologies to provide certain features, enhance the user experience and, if you allow them, measure engagement and deliver advertising. Analytics and marketing storage stay off until you grant consent. By clicking on "Agree and continue", you declare your consent to the use of the selected optional cookies. Manage preferences to update or revoke optional consent for future visits. For more information, see our Privacy Policy .