Comparable stake leader
BlackRock, Inc.
SEC ownership of TENNANT CO
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0000097134.
Disclosed value leader
BlackRock, Inc.
Comparable rows
50/50
Latest evidence
12 Aug 2026
- Public ticker
- TNC on NYSE
- Parsed ownership sources
-
13F, 13D/G, and 3/4/5
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
- Largest SEC-reported holder
-
BlackRock, Inc.
Ranking: Comparable ownership first, then disclosed value
- Comparable ownership rows
-
50 of 50
Meaning: Rows with safely comparable ownership %
- Latest 13D/G holder
-
BlackRock, Inc.
Source: Latest parsed Schedule 13D/G stake
- Latest parsed ownership date
-
12 Aug 2026
Freshness: Most recent filing date in this holder set
- Issuer CIK
- 0000097134
- Issuer location
- Eden Prairie, MN
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 TENNANT CO (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
BlackRock, Inc.
Disclosed value leader
BlackRock, Inc.
Comparable rows
50/50
Latest evidence
12 Aug 2026
13F
13D/G
3/4/5
Lead comparable stake: 15%
13D/G row: BlackRock, Inc.
Showing 1-8 of 50 holder rows.
Quick read
BlackRock, Inc. leads the comparable SEC ownership view at 15%.
50 of 50 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 BlackRock, Inc.'s linked filing trail.
Comparable ownership
Top 5
BlackRock, Inc.
15%
ALLIANCEBERNSTEIN L.P.
7.1%
VANGUARD PORTFOLIO MANAGEMENT LLC
6.6%
FMR LLC
5.8%
VANGUARD CAPITAL MANAGEMENT LLC
5.3%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-8 of 50 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| BlackRock, Inc. |
13F
13D/G
Company
|
15%
from 13D/G
|
$236,255,464
2,698,829 shares
|
— | 30 Jun 2026 |
| ALLIANCEBERNSTEIN L.P. |
13D/G
13F
Company
|
7.1%
|
$106,402,361
1,216,305 shares
|
$0 | 30 Jun 2026 |
| VANGUARD PORTFOLIO MANAGEMENT LLC |
13F
13D/G
Company · Vanguard Portfolio Management
|
6.6%
from 13D/G
|
$103,548,878
1,182,875 shares
|
— | 30 Jun 2026 |
| FMR LLC |
13F
13D/G
Company
|
5.8%
from 13D/G
|
$86,000,834
982,418 shares
|
— | 30 Jun 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC |
13F
13D/G
Company · Vanguard Capital Management
|
5.3%
from 13D/G
|
$67,143,793
767,007 shares
|
— | 30 Jun 2026 |
| MAIRS & POWER INC |
13D/G
13F
Mairs and Power, Inc. · Company
|
4.4%
|
$62,717,663
789,895 shares
|
-$22,357,373 | 31 Mar 2026 |
| David W. Huml |
3/4/5
PRESIDENT AND CEO, Director
|
0.81%
|
$11,245,447
138,559 shares
|
+$257,560 | 06 Mar 2026 |
| Fay West |
3/4/5
SENIOR VP, CFO
|
0.28%
|
$2,944,880
48,253 shares
|
— | 28 Feb 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 buying over the last 12 months. Net value: +$673,867.
Buys
$1,902,660
Insiders: 4
Sells
$1,228,793
Insiders: 4
Net
+$673,867
Shares: +12,808
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 29,663
Shares: 16,855
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 9,500 | 0 | $640,990 | $0 | +$640,990 |
| 3-6 | 8,163 | 6,875 | $499,980 | $605,103 | -$105,123 |
| 6-9 | 12,000 | 9,980 | $761,690 | $623,690 | +$138,001 |
| 9-12 | 0 | 0 | $0 | $0 | $0 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-20 of 21 reporting-owner rows connected to TENNANT CO. Open a relationship link for the CIK-to-CIK filing trail.
Rows
21
Largest Forms 3/4/5 holder
David W. Huml
Net 12M change
+$673,867
Latest report
12 Aug 2026
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| David W. Huml | PRESIDENT AND CEO, Director | $11,245,447 | +$257,560 | +2.3% | Mixed | 06 Mar 2026 |
| Donal L. Mulligan | Director | $3,018,639 | +$1,042,850 | +53% | Mixed | 12 Aug 2026 |
| Fay West | Senior Vp, Cfo | $2,944,880 | Mixed | 28 Feb 2026 | ||
| Steven Alan Sonnenberg | Director | $2,531,356 | Filing P/S | 27 Feb 2024 | ||
| Richard H. Zay | Chief Commercial Officer | $2,421,996 | -$605,103 | -20% | Filing P/S | 07 May 2026 |
| William F. Austen | Director | $2,209,385 | Mixed | 07 May 2021 | ||
| Carol S. Eicher | Director | $2,013,646 | -$193,997 | -8.8% | Mixed | 07 May 2026 |
| Carol E. McKnight | Former, Svp, Chief Admin Offr | $1,784,320 | Mixed | 25 May 2023 | ||
| Kristin A. Erickson | Svp, Chro & Gc | $1,536,491 | Mixed | 28 Feb 2026 | ||
| Azita Arvani | Director | $1,256,620 | -$193,794 | -13% | Mixed | 07 May 2026 |
| Barb Balinski | SVP, Chief Transf Officer | $1,172,874 | Mixed | 28 Feb 2026 | ||
| Maria C. Green | Director | $843,877 | Mixed | 07 May 2026 | ||
| Timothy R. Morse | Director | $723,662 | +$102,270 | +16% | Filing P/S | 12 Aug 2026 |
| Patrick W. Schottler | SVP, Chief Mktg & Tech Officer | $680,484 | Mixed | 28 Feb 2026 | ||
| Glerum James T. Jr. | Director | $669,976 | +$499,980 | +294% | Mixed | 07 May 2026 |
| David Windley | Director | $591,756 | -$235,899 | -29% | Mixed | 07 May 2026 |
| Brock R. Christianson | Svp, Chief Hr Officer | $553,039 | Mixed | 21 Feb 2025 | ||
| Daniel E. Glusick | Svp, Operations | $487,080 | Mixed | 01 Mar 2022 | ||
| Andrew P. Hider | Director | $463,936 | Mixed | 07 May 2026 | ||
| Mark W. Sheahan | Director | $288,707 | Mixed | 07 May 2026 |
Recent insider transactions for TENNANT CO
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 |
|---|---|---|---|---|---|---|---|---|---|---|
| Donal L. Mulligan | TNC | Common Stock | Purchase | 100% | $538,720 | $67.34 | 8,000 | 16,000 | 12 Aug 2026 | By trust for spouse |
| Timothy R. Morse | TNC | Common Stock | Purchase | 16.5% | $102,270 | $68.18 | 1,500 | 10,614 | 12 Aug 2026 | Direct |
| Richard H. Zay | TNC | Common Stock | Sale | -20% | $605,103 | $88.02 | -6,875 | 27,518 | 07 May 2026 | Direct |
| Azita Arvani | TNC | Common Stock | Award | 8.55% | 1,490 | 18,925 | 07 May 2026 | Direct | ||
| Patrick E. Allen | TNC | Common Stock | Award | 341% | 1,490 | 1,927 | 07 May 2026 | Direct | ||
| Carol S. Eicher | TNC | Common Stock | Award | 5.17% | 1,490 | 30,326 | 07 May 2026 | Direct | ||
| James T. Glerum Jr. | TNC | Common Stock | Award | 17.3% | 1,490 | 10,090 | 07 May 2026 | Direct | ||
| Maria C. Green | TNC | Common Stock | Award | 13.3% | 1,490 | 12,709 | 07 May 2026 | Direct | ||
| Andrew P. Hider | TNC | Common Stock | Award | 27.1% | 1,490 | 6,987 | 07 May 2026 | Direct | ||
| Timothy R. Morse | TNC | Common Stock | Award | 19.5% | 1,490 | 9,114 | 07 May 2026 | Direct | ||
| Mark W. Sheahan | TNC | Common Stock | Award | 52.1% | 1,490 | 4,348 | 07 May 2026 | Direct | ||
| David Windley | TNC | Common Stock | Award | 20.1% | 1,490 | 8,912 | 07 May 2026 | Direct | ||
| Donal L. Mulligan | TNC | Common Stock | Award | 7.2% | 1,490 | 22,175 | 07 May 2026 | Direct | ||
| Donal L. Mulligan | TNC | Common Stock | Tax liability | -10.6% | -2,456 | 20,685 | 14 Apr 2026 | Direct | ||
| Donal L. Mulligan | TNC | Common Stock | Options Exercise | 18% | 3,538 | 23,141 | 14 Apr 2026 | Direct | ||
| Donal L. Mulligan | TNC | Stock Option (right to buy) | Options Exercise | -100% | -3,538 | 0 | 14 Apr 2026 | Direct | ||
| David W. Huml | TNC | Common Stock | Gift | 57.9% | 26,755 | 72,930 | 06 Mar 2026 | By Family Trust | ||
| David W. Huml | TNC | Common Stock | Gift | -29% | -26,755 | 65,629 | 06 Mar 2026 | Direct | ||
| James T. Glerum Jr. | TNC | Common Stock | Purchase | 1868% | $499,980 | $61.25 | 8,163 | 8,600 | 02 Mar 2026 | Direct |
| Patrick W. Schottler | TNC | Common Stock | Tax liability | -1.71% | -194 | 11,150 | 28 Feb 2026 | Direct | ||
| Barb Balinski | TNC | Common Stock | Tax liability | -2.29% | -451 | 19,218 | 28 Feb 2026 | Direct | ||
| Kristin A. Erickson | TNC | Common Stock | Tax liability | -2% | -514 | 25,176 | 28 Feb 2026 | Direct | ||
| Richard H. Zay | TNC | Common Stock | Tax liability | -2.38% | -840 | 34,393 | 28 Feb 2026 | Direct | ||
| Fay West | TNC | Common Stock | Tax liability | -1.92% | -945 | 48,253 | 28 Feb 2026 | Direct | ||
| David W. Huml | TNC | Common Stock | Tax liability | -4.42% | -4,268 | 92,384 | 28 Feb 2026 | Direct | ||
| Donal L. Mulligan | TNC | Common Stock | Purchase | 60% | $184,830 | $61.61 | 3,000 | 8,000 | 27 Feb 2026 | By trust for spouse |
| Azita Arvani | TNC | Common Stock | Sale | -15.3% | $193,794 | $61.40 | -3,156 | 17,435 | 27 Feb 2026 | Direct |
| Azita Arvani | TNC | Common Stock | Options Exercise | 20.8% | 3,538 | 20,591 | 27 Feb 2026 | Direct | ||
| Azita Arvani | TNC | Stock Option (right to buy) | Options Exercise | -100% | -3,538 | 0 | 27 Feb 2026 | Direct | ||
| James T. Glerum Jr. | TNC | Common Stock | Award | 437 | 437 | 26 Feb 2026 | Direct | |||
| Donal L. Mulligan | TNC | Common Stock | Purchase | $319,300 | $63.86 | 5,000 | 5,000 | 26 Feb 2026 | By trust for spouse | |
| Carol S. Eicher | TNC | Common Stock | Sale | -9.79% | $193,997 | $61.98 | -3,130 | 28,836 | 26 Feb 2026 | Direct |
| Carol S. Eicher | TNC | Common Stock | Options Exercise | 12.4% | 3,538 | 31,966 | 26 Feb 2026 | Direct | ||
| Carol S. Eicher | TNC | Stock Option (right to buy) | Options Exercise | -100% | -3,538 | 0 | 26 Feb 2026 | Direct | ||
| David Windley | TNC | Common Stock | Sale | -33.2% | $235,899 | $63.86 | -3,694 | 7,422 | 26 Feb 2026 | Direct |
| David Windley | TNC | Common Stock | Options Exercise | 61.8% | 4,245 | 11,116 | 26 Feb 2026 | Direct | ||
| David Windley | TNC | Stock Option (right to buy) | Options Exercise | -100% | -4,245 | 0 | 26 Feb 2026 | Direct | ||
| Barb Balinski | TNC | Common Stock | Tax liability | -10.6% | -1,810 | 15,240 | 26 Feb 2026 | Direct | ||
| Barb Balinski | TNC | Common Stock | Award | 103.6% | 10,008 | 19,669 | 26 Feb 2026 | Direct | ||
| Fay West | TNC | Common Stock | Tax liability | -8.1% | -3,646 | 41,363 | 26 Feb 2026 | Direct | ||
| Fay West | TNC | Common Stock | Award | 65.8% | 19,532 | 49,198 | 26 Feb 2026 | Direct | ||
| Richard H. Zay | TNC | Common Stock | Tax liability | -10.4% | -3,269 | 28,128 | 26 Feb 2026 | Direct | ||
| Richard H. Zay | TNC | Common Stock | Award | 98.7% | 17,504 | 35,233 | 26 Feb 2026 | Direct | ||
| David W. Huml | TNC | Common Stock | Purchase | 6.25% | $257,560 | $64.39 | 4,000 | 67,958 | 26 Feb 2026 | Direct |
| David W. Huml | TNC | Common Stock | Tax liability | -17.8% | -13,807 | 63,958 | 26 Feb 2026 | Direct | ||
| David W. Huml | TNC | Common Stock | Award | 197.5% | 64,166 | 96,652 | 26 Feb 2026 | Direct | ||
| Patrick W. Schottler | TNC | Common Stock | Tax liability | -7.48% | -552 | 6,825 | 26 Feb 2026 | Direct | ||
| Patrick W. Schottler | TNC | Common Stock | Award | 114.5% | 6,056 | 11,344 | 26 Feb 2026 | Direct | ||
| Kristin A. Erickson | TNC | Common Stock | Tax liability | -8.93% | -2,013 | 20,532 | 26 Feb 2026 | Direct | ||
| Kristin A. Erickson | TNC | Common Stock | Award | 81.4% | 11,524 | 25,690 | 26 Feb 2026 | Direct |
* marks a reported price that did not pass the local price check.