Institutional HoldersBeta

Who holds a company, from every 13F filed for the quarter, one row per filer exactly as filed, against the latest share count the company reported.

WESTPORT FUEL SYSTEMS INC.

CIK 0001370416WPRT· quarter ending 2026-06-30

Shares outstanding

17,375,213

as of 2025-12-31 · 20-F cover page, filed 2026-04-23

Held by 13F filers

3,645,996

21.0% of shares outstanding

Holders

+2 vs 2026-03-31 · 8 new, 6 exited

Value

$8.2M

shares +71.0% vs prior quarter

Share classes (cover page of the 20-F filed 2026-04-23, as of 2025-12-31)

Class	Listed	Shares outstanding	Held by 13F filers	% of class	Holders	CUSIP
Common stock	WPRT · NASDAQ	17,375,213	3,645,996	21.0%	45	960908507

Each class is compared with its own share count; classes are not added together. A class that is not exchange-listed cannot be held by 13F filers.

Securities (CUSIPs held in 13F this quarter)

tick to combine

Count	CUSIP	Class (as filers write it)	Holders	Shares held	Class shares	% of class	Value	Options	Mapped via
	960908507	COM	45	3,645,996	17,375,213	21.0%	$8.2M	1 call / 2 put	13DG	holders →

Totals combine the ticked CUSIPs and update as you tick: common-stock classes by default; preferreds, notes, warrants and depositary shares are listed but not counted. "holders →" shows a single CUSIP on its own. Bonds are held as a principal amount, not shares. Options positions are never counted as holdings. 1 further CUSIPs map to this company (mostly bonds) but no 13F filer held them this quarter.

Top holders (45 of 45 · 960908507)

change vs 2026-03-31

#	Filer	Shares	% of class	Value	Change
1	HEIGHTS CAPITAL MANAGEMENT, INC	1,325,121	7.63%	$3.0M	NEW
2	ROYCE & ASSOCIATES LP	1,131,479	6.51%	$2.6M	+639,577 (+130.0%)
3	GRACE & WHITE INC /NY	714,106	4.11%	$1.6M	-292,602 (-29.1%)
4	Baird Financial Group, Inc.	140,024	0.81%	$316K	-23,874 (-14.6%)
5	CITADEL ADVISORS LLC	89,959	0.52%	$203K	-64,946 (-41.9%)
6	US BANCORP \DE\	73,108	0.42%	$165K	-93,721 (-56.2%)
7	GOLDMAN SACHS GROUP INC	31,647	0.18%	$72K	-6,598 (-17.3%)
8	Cambridge Investment Research Advisors, Inc.	23,462	0.14%	$54K	+11,681 (+99.2%)
9	UBS Group AG	19,316	0.11%	$44K	+2,898 (+17.7%)
10	TD Waterhouse Canada Inc.	18,114	0.10%	$38K	—
11	SUSQUEHANNA INTERNATIONAL GROUP, LLP	18,017	0.10%	$41K	NEW
12	JANE STREET GROUP, LLC	13,933	0.08%	$31K	-1,260 (-8.3%)
13	HRT FINANCIAL LP	13,318	0.08%	$30K	NEW
14	LPL Financial LLC	11,280	0.06%	$25K	+1,254 (+12.5%)
15	ROYAL BANK OF CANADA	5,978	0.03%	$13K	-1,880 (-23.9%)
16	MORGAN STANLEY	3,773	0.02%	$9K	-288 (-7.1%)
17	Tower Research Capital LLC (TRC)	2,585	0.01%	$6K	-1,100 (-29.9%)
18	GROUP ONE TRADING LLC	1,997	0.01%	$5K	+1,100 (+122.6%)
19	WELLS FARGO & COMPANY/MN	1,736	0.01%	$4K	+295 (+20.5%)
20	SIMPLEX TRADING, LLC	1,604	0.01%	$4K	NEW
21	Allworth Financial LP	1,025	0.01%	$2K	—
22	SWAN Capital LLC	1,000	0.01%	$2K	—
23	JONES FINANCIAL COMPANIES LLLP	710	0.00%	$2K	—
24	OSAIC HOLDINGS, INC.	583	0.00%	$1K	+100 (+20.7%)
25	Ascentis Wealth Management, LLC	400	0.00%	$904	—
26	HighMark Wealth Management LLC	350	0.00%	$791	—
27	Federation des caisses Desjardins du Quebec	348	0.00%	$748	-1,325 (-79.2%)
28	COUNTRY TRUST BANK	220	0.00%	$497	—
29	DEUTSCHE BANK AG\	184	0.00%	$416	—
30	Core Capital Management & Research, inc.	139	0.00%	$254	NEW
31	SECURITY NATIONAL BANK OF SIOUX CITY IOWA /IA/	124	0.00%	$280	NEW
32	Gen-Wealth Partners Inc	86	0.00%	$194	—
33	THOMPSON INVESTMENT MANAGEMENT, INC.	60	0.00%	$136	-65 (-52.0%)
34	CBIZ Investment Advisory Services, LLC	45	0.00%	$82	—
35	SBI Securities Co., Ltd.	35	0.00%	$79	—
36	Rockefeller Capital Management L.P.	30	0.00%	$68	-55 (-64.7%)
37	Golden State Wealth Management, LLC	30	0.00%	$68	—
38	HARBOUR INVESTMENTS, INC.	27	0.00%	$61	—
39	DELTA ASSET MANAGEMENT LLC/TN	15	0.00%	$34	—
40	Avalon Trust Co	13	0.00%	$30	—
41	BROWN BROTHERS HARRIMAN & CO	10	0.00%	$23	NEW
42	Caitong International Asset Management Co., Ltd	2	0.00%	$5	NEW
43	Robinswood Financial LLC	1	0.00%	$2	—
44	TSFG, LLC	1	0.00%	$0	—
45	CALDWELL SUTTER CAPITAL, INC.	1	0.00%	$2	—

Exited since 2026-03-31 (6 filers; largest 6 shown)

Centiva Capital, LP	−13,012
Bullseye Investment Management, LLC	−200
FIFTH THIRD BANCORP	−170
NATIONAL BANK OF CANADA /FI/	−124
MAI Capital Management	−33
CWM, LLC	−11

Large holders from 13D/13G (latest per reporting person, last 2 years)

Filed when a holder crosses 5% or changes materially, so often more current than the quarter-end 13F. Percentages are the filer's own, against the share count they used.

Reporting person	Form	Filed	Event	Shares	% of class
ROYCE & ASSOCIATES LP	SCHEDULE 13G	2026-07-22	2026-06-30	1,131,479	5.09%
CVI Investments, Inc.	SCHEDULE 13G	2026-06-29	2026-06-22	1,930,712	9.9%
Heights Capital Management, Inc.	SCHEDULE 13G	2026-06-29	2026-06-22	1,930,712	9.9%
Robert W. Baird & Co. Inc	SCHEDULE 13G/A	2026-02-06	2025-12-31	177,282	1%
BAIRD FINANCIAL CORP	SCHEDULE 13G/A	2026-02-06	2025-12-31	177,282	1%
Baird Financial Group, Inc.	SCHEDULE 13G/A	2026-02-06	2025-12-31	177,282	1%
GRACE & WHITE, INC.	SCHEDULE 13G/A	2026-01-27	2025-12-31	1,163,087	6.7%
Irrevocable Descendant's Trust FBO Amanda Anne Douglas	SCHEDULE 13D/A	2025-05-01	2025-04-30	154,505	0.9%
Irrevocable Descendant's Trust FBO Jake Edward Douglas	SCHEDULE 13D/A	2025-05-01	2025-04-30	154,506	0.9%
Irrevocable Descendant's Trust FBO Summer Jean Douglas	SCHEDULE 13D/A	2025-05-01	2025-04-30	154,506	0.9%
James E. Douglas, III	SCHEDULE 13D/A	2025-05-01	2025-04-30	329,166	1.9%
Kevin Douglas	SCHEDULE 13D/A	2025-05-01	2025-04-30	1,816,689	10.5%
K&M Douglas Trust	SCHEDULE 13D/A	2025-05-01	2025-04-30	661,165	3.8%
Michelle Douglas	SCHEDULE 13D/A	2025-05-01	2025-04-30	1,329,478	7.7%
Nonexempt Trust FBO James E. Douglas, III	SCHEDULE 13D/A	2025-05-01	2025-04-30	143,043	0.8%
Nonexempt Trust FBO Kevin G. Douglas	SCHEDULE 13D/A	2025-05-01	2025-04-30	143,045	0.8%
Irrevocable Descendant's Trust FBO Alexander James Douglas	SCHEDULE 13D/A	2025-05-01	2025-04-30	154,506	0.9%
Alex Cushner	SCHEDULE 13G	2025-02-14	2024-12-31	1,144,506	6.68%
BAIRD ROBERT W & CO INC /WI/	SCHEDULE 13G	2025-02-11	2024-12-31	916,168	5.3%

Source: SEC Form 13F-HR information tables for the quarter ending 2026-06-30 (filed within 45 days of quarter end; amendments applied; values normalised to dollars), the share count from the company's latest 10-K/10-Q XBRL cover page, and Schedule 13D/13G filings. Each row is a legal 13F filer as filed — related entities (e.g. Vanguard's advisers) are not merged. Retail brokerage accounts are not reported on 13F, so the remainder is mostly retail and insiders.