Comparable stake leader
SEAPORT GLOBAL ASSET MANAGEMENT LLC
SEC ownership of HENNESSY ADVISORS INC
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001145255.
Disclosed value leader
Neil J. Hennessy
Comparable rows
1/41
Latest evidence
30 Sep 2026
- Public ticker
- HNNA on Nasdaq
- Parsed ownership sources
-
13D/G, 3/4/5, and 13F
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
- Largest SEC-reported holder
-
SEAPORT GLOBAL ASSET MANAGEMENT LLC
Ranking: Comparable ownership first, then disclosed value
- Comparable ownership rows
-
1 of 41
Meaning: Rows with safely comparable ownership %
- Latest 13D/G holder
-
SEAPORT GLOBAL ASSET MANAGEMENT LLC
Source: Latest parsed Schedule 13D/G stake
- Latest parsed ownership date
-
30 Sep 2026
Freshness: Most recent filing date in this holder set
- Issuer CIK
- 0001145255
- Issuer location
- Novato, CA
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
3 signals
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
Ownership snapshot
Top shareholders of HENNESSY ADVISORS 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.
Comparable stake leader
SEAPORT GLOBAL ASSET MANA...
Disclosed value leader
Neil J. Hennessy
Comparable rows
1/41
Latest evidence
30 Sep 2026
13D/G
3/4/5
13F
Lead comparable stake: 5.2%
40 rows are not safely comparable across share classes.
13D/G row: SEAPORT GLOBAL ASSET MANAGEMENT LLC
Showing 1-8 of 41 holder rows.
Quick read
SEAPORT GLOBAL ASSET MANAGEMENT LLC leads the comparable SEC ownership view at 5.2%.
1 of 41 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens SEAPORT GLOBAL ASSET MANAGEMENT LLC's linked filing trail.
Comparable ownership
Top 1
SEAPORT GLOBAL ASSET MANAGEMENT LLC
5.2%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-8 of 41 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| SEAPORT GLOBAL ASSET MANAGEMENT LLC |
13D/G
|
5.2%
Reported 13D/G
· 31 Dec 2025
|
$3,926,667
409,015 shares
|
$0 | 31 Dec 2025 |
| Neil J. Hennessy |
3/4/5
CEO, Director, 10%+ Owner
|
—
denominator unverified
|
$21,329,330
2,101,412 shares
|
— | 18 Sep 2026 |
| Brian A. Hennessy |
3/4/5
Director
|
—
denominator unverified
|
$2,841,650
279,966 shares
|
— | 18 Sep 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC |
13F
Company
|
—
denominator unverified
|
$2,422,419
238,662 shares
|
— | 30 Jun 2026 |
| Henry C. Hansel |
3/4/5
Director
|
—
denominator unverified
|
$2,291,108
225,725 shares
|
— | 18 Sep 2026 |
| Truffle Hound Capital, LLC |
13F
Company
|
—
denominator unverified
|
$2,030,000
200,000 shares
|
— | 30 Jun 2026 |
| Teresa M. Nilsen |
3/4/5
President, COO and Secretary, Director
|
—
denominator unverified
|
$1,745,240
171,945 shares
|
— | 18 Sep 2026 |
| AEGIS FINANCIAL CORP |
13F
Company
|
—
denominator unverified
|
$1,733,295
170,768 shares
|
— | 30 Jun 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: -$188,922.
Buys
$0
Insiders: 0
Sells
$188,922
Insiders: 4
Net
-$188,922
Shares: -18,742
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 0
Shares: 18,742
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 0 | 8,171 | $0 | $83,583 | -$83,583 |
| 3-6 | 0 | 10,000 | $0 | $100,000 | -$100,000 |
| 6-9 | 0 | 0 | $0 | $0 | $0 |
| 9-12 | 0 | 571 | $0 | $5,339 | -$5,339 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-12 of 12 reporting-owner rows connected to HENNESSY ADVISORS INC. Open a relationship link for the CIK-to-CIK filing trail.
Rows
12
Largest Forms 3/4/5 holder
Neil J. Hennessy
Net 12M change
-$188,921
Latest report
30 Sep 2026
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| Neil J. Hennessy | CEO, Director, 10%+ Owner | $21,329,330 | Mixed | 18 Sep 2026 | ||
| Brian A. Hennessy | Director | $2,841,650 | Mixed | 18 Sep 2026 | ||
| Henry C. Hansel | Director | $2,291,108 | Mixed | 18 Sep 2026 | ||
| Teresa M. Nilsen | President, COO and Secretary, Director | $1,745,240 | Mixed | 18 Sep 2026 | ||
| Rodger D. Offenbach | Advisory Committee Member | $1,448,835 | Mixed | 18 Sep 2025 | ||
| Susan W. Pomilia | Director | $1,249,525 | Mixed | 18 Sep 2026 | ||
| Kathryn Fahy | SVP and CFO | $699,648 | -$100,000 | -13% | Mixed | 18 Sep 2026 |
| Daniel G. Libarle | Advisory Committee Member | $676,091 | Mixed | 18 Sep 2026 | ||
| Thomas L. Seavey | Director | $606,509 | -$19,031 | -3% | Filing P/S | 24 Sep 2026 |
| Daniel B. Steadman | Executive VP, Advisory Committee Member | $385,882 | -$51,313 | -12% | Mixed | 30 Sep 2026 |
| ORiordan Lydia D. Knight | Director | $273,035 | Mixed | 18 Sep 2026 | ||
| Kiera M. Newton | Director | $206,391 | -$18,577 | -8.3% | Filing P/S | 29 Sep 2026 |
Recent insider transactions for HENNESSY ADVISORS INC
Showing up to 300 recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | SEC-reported value | SEC-reported price | Shares | Shares owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| Daniel B. Steadman | HNNA | Common Stock | Gift | -5.3% | -2,000 | 35,768 | 30 Sep 2026 | Direct | ||
| Kiera M. Newton | HNNA | Common Stock | Sale | -2.39% | $5,050 | $10.02 | -504 | 20,598 | 29 Sep 2026 | Direct |
| Thomas L. Seavey | HNNA | Common Stock | Sale | -3.04% | $19,031 | $10.15 | -1,875 | 59,754 | 24 Sep 2026 | Direct |
| Daniel B. Steadman | HNNA | Common Stock | Sale | -11.7% | $51,313 | $10.26 | -5,000 | 37,768 | 24 Sep 2026 | Direct |
| Neil J. Hennessy | HNNA | Common Stock | Tax liability | -0.46% | -9,520 | 2,071,291 | 18 Sep 2026 | By Trust | ||
| Neil J. Hennessy | HNNA | Common Stock | Award | 0.96% | 19,700 | 2,080,812 | 18 Sep 2026 | By Trust | ||
| Teresa M. Nilsen | HNNA | Common Stock | Tax liability | -5.58% | -9,520 | 161,002 | 18 Sep 2026 | Direct | ||
| Teresa M. Nilsen | HNNA | Common Stock | Award | 13.1% | 19,700 | 170,523 | 18 Sep 2026 | Direct | ||
| Daniel B. Steadman | HNNA | Common Stock | Tax liability | -6.97% | -3,206 | 42,768 | 18 Sep 2026 | Direct | ||
| Daniel B. Steadman | HNNA | Common Stock | Award | 25.7% | 9,400 | 45,974 | 18 Sep 2026 | Direct | ||
| Kathryn Fahy | HNNA | Common Stock | Tax liability | -5.82% | -4,258 | 68,931 | 18 Sep 2026 | Direct | ||
| Kathryn Fahy | HNNA | Common Stock | Award | 20.6% | 12,500 | 73,189 | 18 Sep 2026 | Direct | ||
| Henry C. Hansel | HNNA | Common Stock | Award | 2.54% | 5,600 | 225,725 | 18 Sep 2026 | Direct | ||
| Brian A. Hennessy | HNNA | Common Stock | Award | 2.44% | 5,600 | 234,665 | 18 Sep 2026 | By Trust | ||
| Susan W. Pomilia | HNNA | Common Stock | Award | 11.2% | 5,600 | 55,487 | 18 Sep 2026 | Direct | ||
| Thomas L. Seavey | HNNA | Common Stock | Award | 9.99% | 5,600 | 61,629 | 18 Sep 2026 | Direct | ||
| ORiordan Lydia D. Knight | HNNA | Common Stock | Award | 26.3% | 5,600 | 26,900 | 18 Sep 2026 | Direct | ||
| Kiera M. Newton | HNNA | Common Stock | Award | 36.1% | 5,600 | 21,102 | 18 Sep 2026 | Direct | ||
| Daniel G. Libarle | HNNA | Common Stock | Award | 4.39% | 2,800 | 66,610 | 18 Sep 2026 | By Trust | ||
| Kiera M. Newton | HNNA | Common Stock | Sale | -1.27% | $2,060 | $10.35 | -199 | 15,502 | 16 Sep 2026 | Direct |
| Kiera M. Newton | HNNA | Common Stock | Sale | -3.64% | $6,129 | $10.34 | -593 | 15,701 | 14 Sep 2026 | Direct |
| Kathryn Fahy | HNNA | Common Stock | Sale | -14.2% | $100,000 | $10.00 | -10,000 | 60,689 | 11 May 2026 | Direct |
| Kiera M. Newton | HNNA | Common Stock | Sale | -3.39% | $5,339 | $9.35 | -571 | 16,294 | 30 Dec 2025 | Direct |
| Daniel B. Steadman | HNNA | Common Stock | Gift | -2.01% | -750 | 36,574 | 26 Dec 2025 | Direct | ||
| Brian A. Hennessy | HNNA | Common Stock | Gift | -2.09% | -4,900 | 229,065 | 19 Dec 2025 | By Trust | ||
| Kathryn Fahy | HNNA | Common Stock | Gift | -2.75% | -2,000 | 70,689 | 10 Dec 2025 | Direct | ||
| Daniel B. Steadman | HNNA | Common Stock | Gift | 28.6% | 500 | 2,250 | 08 Dec 2025 | FBO Child | ||
| Daniel B. Steadman | HNNA | Common Stock | Gift | -1.32% | -500 | 37,324 | 08 Dec 2025 | Direct |
* marks a reported price that did not pass the local price check.