CECO US Equity

CECO ENVIRONMENTAL CORP

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Industrials · Industrial & Commercial Fans & Blowers & Air Purifing Equip · CIK 3197 · FYE 1231

$59.82

-7.66 (-11.35%)

USD · as of 2026-07-29 · marketstack

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Institutional ownership· 13F filers holding CECO · 2026-Q1 methodology → sources →

260 holders

% of shares outstanding held

87.7%

Shares held (13F)

31,473,279

Reporting holders

260

Top holders

largest 100 of 260 · Δ vs 2025-Q4

#	Holder	Shares	Value	% of shares out	Δ QoQ
1	FMR LLC	2,328,8882.3M	$139M	6.49%	ADD 5%
2	BlackRock, Inc.	2,285,2772.3M	$136M	6.37%	—
3	T. Rowe Price Investment Management, Inc.	2,131,8452.1M	$127M	5.94%	ADD 187%
4	AMERICAN CENTURY COMPANIES INC	1,894,1771.9M	$113M	5.28%	TRIM -7%
5	VANGUARD CAPITAL MANAGEMENT LLC	1,332,4691.3M	$79M	3.71%	NEW†
6	Capital World Investors	1,055,0801.1M	$63M	2.94%	ADD 217%
7	TWO SIGMA INVESTMENTS, LP	959,698959,698	$57M	2.68%	ADD 83%
8	JANUS HENDERSON GROUP PLC	907,782907,782	$54M	2.53%	—
9	DIMENSIONAL FUND ADVISORS LP	903,291903,291	$54M	2.52%	—
10	GEODE CAPITAL MANAGEMENT, LLC	856,133856,133	$51M	2.39%	ADD 17%
11	ROYCE & ASSOCIATES LP	827,781827,781	$49M	2.31%	ADD 12%
12	KING LUTHER CAPITAL MANAGEMENT CORP	750,083750,083	$45M	2.09%	TRIM -21%
13	STATE STREET CORP	657,349657,349	$39M	1.83%	—
14	Thrivent Financial for Lutherans	640,006640,006	$38M	1.78%	TRIM -5%
15	Driehaus Capital Management LLC	639,892639,892	$38M	1.78%	ADD 10%
16	IES Holdings, Inc.	568,527568,527	$34M	1.58%	ADD 101%
17	EMERALD ADVISERS, LLC	523,017523,017	$31M	1.46%	ADD 14%
18	LORD, ABBETT & CO. LLC	414,400414,400	$25M	1.16%	ADD 105%
19	Legal & General Group Plc	400,472400,472	$24M	1.12%	TRIM -4%
20	NEEDHAM INVESTMENT MANAGEMENT LLC	387,500387,500	$23M	1.08%	ADD 30%
21	MORGAN STANLEY	350,740350,740	$21M	0.98%	ADD 19%
22	EMERALD MUTUAL FUND ADVISERS TRUST	314,005314,005	$19M	0.88%	ADD 20%
23	Rockefeller Capital Management L.P.	254,321254,321	$15M	0.71%	NEW
24	MARSHALL WACE, LLP	251,904251,904	$15M	0.70%	ADD 3130%
25	NORTHERN TRUST CORP	251,874251,874	$15M	0.70%	ADD 3%
26	MARTIN & CO INC /TN/	249,462249,462	$15M	0.70%	ADD 3%
27	CHARLES SCHWAB INVESTMENT MANAGEMENT INC	247,499247,499	$15M	0.69%	TRIM -2%
28	First Eagle Investment Management, LLC	242,511242,511	$14M	0.68%	TRIM -34%
29	VANGUARD PORTFOLIO MANAGEMENT LLC	237,837237,837	$14M	0.66%	NEW
30	FARALLON CAPITAL MANAGEMENT LLC	234,000234,000	$14M	0.65%	NEW
31	LOOMIS SAYLES & CO L P	229,014229,014	$14M	0.64%	TRIM -30%
32	DEUTSCHE BANK AG\	227,787227,787	$14M	0.63%	—
33	OSTERWEIS CAPITAL MANAGEMENT INC	226,617226,617	$14M	0.63%	—
34	CITADEL ADVISORS LLC	217,386217,386	$13M	0.61%	ADD 234%
35	BESSEMER GROUP INC	216,494216,494	$13M	0.60%	ADD 108147%
36	VANGUARD FIDUCIARY TRUST CO	209,692209,692	$12M	0.58%	NEW
37	UBS Group AG	201,107201,107	$12M	0.56%	TRIM -25%
38	Robeco Schweiz AG	198,743198,743	$12M	0.55%	ADD 51%
39	BNP PARIBAS FINANCIAL MARKETS	191,494191,494	$11M	0.53%	ADD 8%
40	Divisadero Street Capital Management, LP	187,600187,600	$11M	0.52%	NEW
41	SEGALL BRYANT & HAMILL, LLC	175,054175,054	$10M	0.49%	TRIM -5%
42	Amundi	168,199168,199	$10M	0.47%	TRIM -5%
43	Squarepoint Ops LLC	165,266165,266	$10M	0.46%	ADD 125%
44	Point72 Asset Management, L.P.	159,079159,079	$9M	0.44%	NEW
45	ESSEX INVESTMENT MANAGEMENT CO LLC	157,246157,246	$9M	0.44%	—
46	FIRST TRUST ADVISORS LP	156,563156,563	$9M	0.44%	ADD 2%
47	PEREGRINE CAPITAL MANAGEMENT LLC	154,307154,307	$9M	0.43%	TRIM -16%
48	Pier Capital, LLC	150,245150,245	$9M	0.42%	ADD 54%
49	KENNEDY CAPITAL MANAGEMENT LLC	149,778149,778	$9M	0.42%	—
50	FRANKLIN RESOURCES INC	147,465147,465	$9M	0.41%	TRIM -42%
51	Allspring Global Investments Holdings, LLC	146,701146,701	$9M	0.41%	TRIM -25%
52	POLEN CAPITAL MANAGEMENT LLCtracked	143,231143,231	$9M	0.40%	ADD 105%
53	OBERWEIS ASSET MANAGEMENT INC/	135,032135,032	$8M	0.38%	TRIM -7%
54	VOLORIDGE INVESTMENT MANAGEMENT, LLC	134,370134,370	$8M	0.37%	ADD 19%
55	SILVERCREST ASSET MANAGEMENT GROUP LLC	131,652131,652	$8M	0.37%	TRIM -36%
56	GOLDMAN SACHS GROUP INC	126,512126,512	$8M	0.35%	ADD 59%
57	Nuveen, LLC	121,866121,866	$7M	0.34%	TRIM -53%
58	ARROWSTREET CAPITAL, LIMITED PARTNERSHIP	115,242115,242	$7M	0.32%	ADD 311%
59	Russell Investments Group, Ltd.	114,482114,482	$7M	0.32%	ADD 4%
60	SEI INVESTMENTS CO	111,313111,313	$7M	0.31%	ADD 3%
61	MARATHON CAPITAL MANAGEMENT	98,33098,330	$6M	0.27%	TRIM -3%
62	AQR CAPITAL MANAGEMENT LLC	93,15793,157	$6M	0.26%	ADD 239%
63	Granahan Investment Management, LLC	92,72892,728	$6M	0.26%	TRIM -15%
64	GREAT LAKES ADVISORS, LLC	91,07191,071	$5M	0.25%	TRIM -22%
65	Bank of New York Mellon Corp	86,40586,405	$5M	0.24%	TRIM -2%
66	SG Americas Securities, LLC	78,14378,143	$5M	0.22%	TRIM -3%
67	BANK OF AMERICA CORP /DE/	76,33976,339	$5M	0.21%	TRIM -39%
68	Peregrine Asset Advisers, Inc.	73,88673,886	$4M	0.21%	TRIM -35%
69	Panoramic Capital, LLC	66,56666,566	$4M	0.19%	ADD 43%
70	4D Advisors, LLC	65,00065,000	$4M	0.18%	NEW
71	FORMULA GROWTH LTD	62,34462,344	$4M	0.17%	TRIM -12%
72	Legato Capital Management LLC	60,62660,626	$4M	0.17%	TRIM -25%
73	UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC	60,31060,310	$4M	0.17%	TRIM -8%
74	Swiss National Bank	59,90059,900	$4M	0.17%	—
75	Calamos Advisors LLC	58,05358,053	$3M	0.16%	ADD 10%
76	Moran Wealth Management, LLC	56,95356,953	$3M	0.16%	ADD 393%
77	WHITE PINE CAPITAL LLC	56,70756,707	$3M	0.16%	TRIM -12%
78	TIG Advisors, LLC	54,23454,234	$3M	0.15%	NEW
79	Aquatic Capital Management LLC	52,73152,731	$3M	0.15%	NEW
80	TD Asset Management Inc	52,72452,724	$3M	0.15%	ADD 120%
81	NOMURA ASSET MANAGEMENT INTERNATIONAL INC.	50,52050,520	$3M	0.14%	—
82	1060 Capital, LLC	50,00050,000	$3M	0.14%	NEW
83	North Star Investment Management Corp.	48,15048,150	$3M	0.13%	ADD 7%
84	CREDIT AGRICOLE S A	47,93647,936	$3M	0.13%	—
85	TUDOR INVESTMENT CORP ET AL	47,25247,252	$3M	0.13%	TRIM -55%
86	NAVELLIER & ASSOCIATES INC	45,28045,280	$3M	0.13%	ADD 7%
87	Janney Montgomery Scott LLC	45,04045,040	$3M	0.13%	—
88	SUSQUEHANNA INTERNATIONAL GROUP, LLP	41,69741,697	$2M	0.12%	TRIM -30%
89	JACOBS LEVY EQUITY MANAGEMENT, INC	40,49840,498	$2M	0.11%	—
90	Expect Equity LLC	38,47338,473	$2M	0.11%	TRIM -20%
91	Walleye Capital LLC	38,44938,449	$2M	0.11%	NEW
92	Continuum Advisory, LLC	37,44337,443	$2M	0.10%	—
93	Invesco Ltd.	36,95636,956	$2M	0.10%	TRIM -73%
94	RHUMBLINE ADVISERS	36,03136,031	$2M	0.10%	—
95	Hudson Bay Capital Management LP	35,00035,000	$2M	0.10%	NEW
96	CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM	34,75834,758	$2M	0.10%	ADD 27%
97	Creative Planning	34,51234,512	$2M	0.10%	ADD 455%
98	PRINCIPAL FINANCIAL GROUP INC	34,48534,485	$2M	0.10%	ADD 22%
99	HighTower Advisors, LLC	34,41634,416	$2M	0.10%	ADD 67%
100	NorthCrest Asset Manangement, LLC	32,26532,265	$2M	0.09%	—

† a filer this large appearing as NEW usually reflects a renamed or succeeded filing entity (the old name stops filing the same quarter) — not a brand-new position.

Rows rank by the value each filer reported — 13F filers price their own positions, so a holder with fewer shares can rank just above one with more.

Holder trends· top 15 holders · shares held over 6 quarters

green added · red trimmed

Holder

2024-Q4

2025-Q1

2025-Q2

2025-Q3

2025-Q4

2026-Q1

Latest value

FMR LLC

1.8M

2.0M

2.2M

2.1M

2.2M

2.3M

$139M

BlackRock, Inc.

2.3M

2.2M

2.3M

$136M

T. Rowe Price Investment Management, Inc.

—

352K

744K

2.1M

$127M

AMERICAN CENTURY COMPANIES INC

53K

57K

1.3M

2.0M

1.9M

$113M

VANGUARD CAPITAL MANAGEMENT LLC

—

1.3M

$79M

Capital World Investors

—

333K

1.1M

$63M

TWO SIGMA INVESTMENTS, LP

48K

55K

303K

526K

960K

$57M

JANUS HENDERSON GROUP PLC

641K

640K

941K

920K

922K

908K

$54M

DIMENSIONAL FUND ADVISORS LP

1.5M

1.3M

1.2M

976K

896K

903K

$54M

GEODE CAPITAL MANAGEMENT, LLC

692K

694K

712K

721K

730K

856K

$51M

ROYCE & ASSOCIATES LP

915K

945K

1.0M

825K

741K

828K

$49M

KING LUTHER CAPITAL MANAGEMENT CORP

1.0M

1.1M

1.2M

1.1M

951K

750K

$45M

STATE STREET CORP

668K

649K

658K

650K

651K

657K

$39M

Thrivent Financial for Lutherans

585K

742K

757K

493K

672K

640K

$38M

Driehaus Capital Management LLC

584K

582K

610K

519K

580K

640K

$38M

Shares reported each quarter by the largest current holders. Green = added vs the prior filing, red = trimmed, grey = roughly held; a dash is a quarter with no 13F on file (a gap is skipped, not read as an exit). 13F is filed up to 45 days after quarter-end. Up to 40 quarters (10 years) available — use the selector above.

Institutional footprint by quarter

Line breaks are honest gaps — quarters with no 13F record, or a suppressed % — never interpolated. % of shares outstanding uses today's share count for every quarter (the only count stored).

Quarter	Holders	Shares held	% shares out	Value held
2026-Q1	260	31,473,279	87.7%	$1.9B
2025-Q4

Short interest has its own tab now — open SI →

Source: SEC Form 13F — every institution manager (≥ $100M in 13F securities) reporting a long US-listed position, across ~10,250 filers over 10 years of history. 13F is long-only, US-listed, filed up to 45 days after quarter-end.

Activists & large holders· Schedule 13D/G beneficial owners · CECO

Activists — 13D, active intent

DEZWIREK JASON11.7%NEWSCHEDULE 13D/A · Amd 18 · event 2026-02-23SEC →

4,198,111 shares · 3 reporting persons

“Item 4 of the Schedule 13D is hereby amended and supplemented by adding the following at the end thereof: On February 23, 2026, the Issuer, Longhorn Merger Sub Inc., a Delaware corporation and wholly owned subsidiary of the Issuer ("Merger Sub Inc."), and Longhorn Merger Sub LLC, a Delaware limited liability company and wholly owned subsidiary of the Issuer ("Merger Sub LLC"), and Thermon Group Holdings, Inc., a Delaware corporation ("Thermon") entered into an Agreement and Plan of Merger, dated”

Large holders — 13G, passive (top 5 of 8 by % of class)

Holder

% of class

Type

As of

BlackRock, Inc.

6.3%

QII

2025-06-30

SEC →

FMR LLC

6.2%

QII

2025-06-30

SEC →

T. Rowe Price Investment Management, Inc.

Institutional ownership· 13F filers holding CECO · 2026-Q1 methodology → sources →

260 holders

% of shares outstanding held

87.7%

Shares held (13F)

31,473,279

Reporting holders

260

Top holders

largest 100 of 260 · Δ vs 2025-Q4

#	Holder	Shares	Value	% of shares out	Δ QoQ
1	FMR LLC	2,328,8882.3M	$139M	6.49%	ADD 5%
2	BlackRock, Inc.	2,285,2772.3M	$136M	6.37%	—
3	T. Rowe Price Investment Management, Inc.	2,131,8452.1M	$127M	5.94%	ADD 187%
4	AMERICAN CENTURY COMPANIES INC	1,894,1771.9M	$113M	5.28%	TRIM -7%
5	VANGUARD CAPITAL MANAGEMENT LLC	1,332,4691.3M	$79M	3.71%	NEW†
6	Capital World Investors	1,055,0801.1M	$63M	2.94%	ADD 217%
7	TWO SIGMA INVESTMENTS, LP	959,698959,698	$57M	2.68%	ADD 83%
8	JANUS HENDERSON GROUP PLC	907,782907,782	$54M	2.53%	—
9	DIMENSIONAL FUND ADVISORS LP	903,291903,291	$54M	2.52%	—
10	GEODE CAPITAL MANAGEMENT, LLC	856,133856,133	$51M	2.39%	ADD 17%
11	ROYCE & ASSOCIATES LP	827,781827,781	$49M	2.31%	ADD 12%
12	KING LUTHER CAPITAL MANAGEMENT CORP	750,083750,083	$45M	2.09%	TRIM -21%
13	STATE STREET CORP	657,349657,349	$39M	1.83%	—
14	Thrivent Financial for Lutherans	640,006640,006	$38M	1.78%	TRIM -5%
15	Driehaus Capital Management LLC	639,892639,892	$38M	1.78%	ADD 10%
16	IES Holdings, Inc.	568,527568,527	$34M	1.58%	ADD 101%
17	EMERALD ADVISERS, LLC	523,017523,017	$31M	1.46%	ADD 14%
18	LORD, ABBETT & CO. LLC	414,400414,400	$25M	1.16%	ADD 105%
19	Legal & General Group Plc	400,472400,472	$24M	1.12%	TRIM -4%
20	NEEDHAM INVESTMENT MANAGEMENT LLC	387,500387,500	$23M	1.08%	ADD 30%
21	MORGAN STANLEY	350,740350,740	$21M	0.98%	ADD 19%
22	EMERALD MUTUAL FUND ADVISERS TRUST	314,005314,005	$19M	0.88%	ADD 20%
23	Rockefeller Capital Management L.P.	254,321254,321	$15M	0.71%	NEW
24	MARSHALL WACE, LLP	251,904251,904	$15M	0.70%	ADD 3130%
25	NORTHERN TRUST CORP	251,874251,874	$15M	0.70%	ADD 3%
26	MARTIN & CO INC /TN/	249,462249,462	$15M	0.70%	ADD 3%
27	CHARLES SCHWAB INVESTMENT MANAGEMENT INC	247,499247,499	$15M	0.69%	TRIM -2%
28	First Eagle Investment Management, LLC	242,511242,511	$14M	0.68%	TRIM -34%
29	VANGUARD PORTFOLIO MANAGEMENT LLC	237,837237,837	$14M	0.66%	NEW
30	FARALLON CAPITAL MANAGEMENT LLC	234,000234,000	$14M	0.65%	NEW
31	LOOMIS SAYLES & CO L P	229,014229,014	$14M	0.64%	TRIM -30%
32	DEUTSCHE BANK AG\	227,787227,787	$14M	0.63%	—
33	OSTERWEIS CAPITAL MANAGEMENT INC	226,617226,617	$14M	0.63%	—
34	CITADEL ADVISORS LLC	217,386217,386	$13M	0.61%	ADD 234%
35	BESSEMER GROUP INC	216,494216,494	$13M	0.60%	ADD 108147%
36	VANGUARD FIDUCIARY TRUST CO	209,692209,692	$12M	0.58%	NEW
37	UBS Group AG	201,107201,107	$12M	0.56%	TRIM -25%
38	Robeco Schweiz AG	198,743198,743	$12M	0.55%	ADD 51%
39	BNP PARIBAS FINANCIAL MARKETS	191,494191,494	$11M	0.53%	ADD 8%
40	Divisadero Street Capital Management, LP	187,600187,600	$11M	0.52%	NEW
41	SEGALL BRYANT & HAMILL, LLC	175,054175,054	$10M	0.49%	TRIM -5%
42	Amundi	168,199168,199	$10M	0.47%	TRIM -5%
43	Squarepoint Ops LLC	165,266165,266	$10M	0.46%	ADD 125%
44	Point72 Asset Management, L.P.	159,079159,079	$9M	0.44%	NEW
45	ESSEX INVESTMENT MANAGEMENT CO LLC	157,246157,246	$9M	0.44%	—
46	FIRST TRUST ADVISORS LP	156,563156,563	$9M	0.44%	ADD 2%
47	PEREGRINE CAPITAL MANAGEMENT LLC	154,307154,307	$9M	0.43%	TRIM -16%
48	Pier Capital, LLC	150,245150,245	$9M	0.42%	ADD 54%
49	KENNEDY CAPITAL MANAGEMENT LLC	149,778149,778	$9M	0.42%	—
50	FRANKLIN RESOURCES INC	147,465147,465	$9M	0.41%	TRIM -42%
51	Allspring Global Investments Holdings, LLC	146,701146,701	$9M	0.41%	TRIM -25%
52	POLEN CAPITAL MANAGEMENT LLCtracked	143,231143,231	$9M	0.40%	ADD 105%
53	OBERWEIS ASSET MANAGEMENT INC/	135,032135,032	$8M	0.38%	TRIM -7%
54	VOLORIDGE INVESTMENT MANAGEMENT, LLC	134,370134,370	$8M	0.37%	ADD 19%
55	SILVERCREST ASSET MANAGEMENT GROUP LLC	131,652131,652	$8M	0.37%	TRIM -36%
56	GOLDMAN SACHS GROUP INC	126,512126,512	$8M	0.35%	ADD 59%
57	Nuveen, LLC	121,866121,866	$7M	0.34%	TRIM -53%
58	ARROWSTREET CAPITAL, LIMITED PARTNERSHIP	115,242115,242	$7M	0.32%	ADD 311%
59	Russell Investments Group, Ltd.	114,482114,482	$7M	0.32%	ADD 4%
60	SEI INVESTMENTS CO	111,313111,313	$7M	0.31%	ADD 3%
61	MARATHON CAPITAL MANAGEMENT	98,33098,330	$6M	0.27%	TRIM -3%
62	AQR CAPITAL MANAGEMENT LLC	93,15793,157	$6M	0.26%	ADD 239%
63	Granahan Investment Management, LLC	92,72892,728	$6M	0.26%	TRIM -15%
64	GREAT LAKES ADVISORS, LLC	91,07191,071	$5M	0.25%	TRIM -22%
65	Bank of New York Mellon Corp	86,40586,405	$5M	0.24%	TRIM -2%
66	SG Americas Securities, LLC	78,14378,143	$5M	0.22%	TRIM -3%
67	BANK OF AMERICA CORP /DE/	76,33976,339	$5M	0.21%	TRIM -39%
68	Peregrine Asset Advisers, Inc.	73,88673,886	$4M	0.21%	TRIM -35%
69	Panoramic Capital, LLC	66,56666,566	$4M	0.19%	ADD 43%
70	4D Advisors, LLC	65,00065,000	$4M	0.18%	NEW
71	FORMULA GROWTH LTD	62,34462,344	$4M	0.17%	TRIM -12%
72	Legato Capital Management LLC	60,62660,626	$4M	0.17%	TRIM -25%
73	UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC	60,31060,310	$4M	0.17%	TRIM -8%
74	Swiss National Bank	59,90059,900	$4M	0.17%	—
75	Calamos Advisors LLC	58,05358,053	$3M	0.16%	ADD 10%
76	Moran Wealth Management, LLC	56,95356,953	$3M	0.16%	ADD 393%
77	WHITE PINE CAPITAL LLC	56,70756,707	$3M	0.16%	TRIM -12%
78	TIG Advisors, LLC	54,23454,234	$3M	0.15%	NEW
79	Aquatic Capital Management LLC	52,73152,731	$3M	0.15%	NEW
80	TD Asset Management Inc	52,72452,724	$3M	0.15%	ADD 120%
81	NOMURA ASSET MANAGEMENT INTERNATIONAL INC.	50,52050,520	$3M	0.14%	—
82	1060 Capital, LLC	50,00050,000	$3M	0.14%	NEW
83	North Star Investment Management Corp.	48,15048,150	$3M	0.13%	ADD 7%
84	CREDIT AGRICOLE S A	47,93647,936	$3M	0.13%	—
85	TUDOR INVESTMENT CORP ET AL	47,25247,252	$3M	0.13%	TRIM -55%
86	NAVELLIER & ASSOCIATES INC	45,28045,280	$3M	0.13%	ADD 7%
87	Janney Montgomery Scott LLC	45,04045,040	$3M	0.13%	—
88	SUSQUEHANNA INTERNATIONAL GROUP, LLP	41,69741,697	$2M	0.12%	TRIM -30%
89	JACOBS LEVY EQUITY MANAGEMENT, INC	40,49840,498	$2M	0.11%	—
90	Expect Equity LLC	38,47338,473	$2M	0.11%	TRIM -20%
91	Walleye Capital LLC	38,44938,449	$2M	0.11%	NEW
92	Continuum Advisory, LLC	37,44337,443	$2M	0.10%	—
93	Invesco Ltd.	36,95636,956	$2M	0.10%	TRIM -73%
94	RHUMBLINE ADVISERS	36,03136,031	$2M	0.10%	—
95	Hudson Bay Capital Management LP	35,00035,000	$2M	0.10%	NEW
96	CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM	34,75834,758	$2M	0.10%	ADD 27%
97	Creative Planning	34,51234,512	$2M	0.10%	ADD 455%
98	PRINCIPAL FINANCIAL GROUP INC	34,48534,485	$2M	0.10%	ADD 22%
99	HighTower Advisors, LLC	34,41634,416	$2M	0.10%	ADD 67%
100	NorthCrest Asset Manangement, LLC	32,26532,265	$2M	0.09%	—

† a filer this large appearing as NEW usually reflects a renamed or succeeded filing entity (the old name stops filing the same quarter) — not a brand-new position.

Rows rank by the value each filer reported — 13F filers price their own positions, so a holder with fewer shares can rank just above one with more.

Holder trends· top 15 holders · shares held over 6 quarters

green added · red trimmed

Holder

2024-Q4

2025-Q1

2025-Q2

2025-Q3

2025-Q4

2026-Q1

Latest value

FMR LLC

1.8M

2.0M

2.2M

2.1M

2.2M

2.3M

$139M

BlackRock, Inc.

2.3M

2.2M

2.3M

$136M

T. Rowe Price Investment Management, Inc.

—

352K

744K

2.1M

$127M

AMERICAN CENTURY COMPANIES INC

53K

57K

1.3M

2.0M

1.9M

$113M

VANGUARD CAPITAL MANAGEMENT LLC

—

1.3M

$79M

Capital World Investors

—

333K

1.1M

$63M

TWO SIGMA INVESTMENTS, LP

48K

55K

303K

526K

960K

$57M

JANUS HENDERSON GROUP PLC

641K

640K

941K

920K

922K

908K

$54M

DIMENSIONAL FUND ADVISORS LP

1.5M

1.3M

1.2M

976K

896K

903K

$54M

GEODE CAPITAL MANAGEMENT, LLC

692K

694K

712K

721K

730K

856K

$51M

ROYCE & ASSOCIATES LP

915K

945K

1.0M

825K

741K

828K

$49M

KING LUTHER CAPITAL MANAGEMENT CORP

1.0M

1.1M

1.2M

1.1M

951K

750K

$45M

STATE STREET CORP

668K

649K

658K

650K

651K

657K

$39M

Thrivent Financial for Lutherans

585K

742K

757K

493K

672K

640K

$38M

Driehaus Capital Management LLC

584K

582K

610K

519K

580K

640K

$38M

Institutional footprint by quarter

Line breaks are honest gaps — quarters with no 13F record, or a suppressed % — never interpolated. % of shares outstanding uses today's share count for every quarter (the only count stored).

Quarter	Holders	Shares held	% shares out	Value held
2026-Q1	260	31,473,279	87.7%	$1.9B
2025-Q4

Short interest has its own tab now — open SI →

Activists & large holders· Schedule 13D/G beneficial owners · CECO

Activists — 13D, active intent

DEZWIREK JASON11.7%NEWSCHEDULE 13D/A · Amd 18 · event 2026-02-23SEC →

4,198,111 shares · 3 reporting persons

Large holders — 13G, passive (top 5 of 8 by % of class)

Holder

% of class

Type

As of

BlackRock, Inc.

6.3%

QII

2025-06-30

SEC →

FMR LLC

6.2%

QII

2025-06-30

SEC →

T. Rowe Price Investment Management, Inc.

CECO US Equity☆

Institutional ownership· 13F filers holding CECO · 2026-Q1 methodology → sources →

Top holders

Holder trends· top 15 holders · shares held over 6 quarters

Institutional footprint by quarter

Activists & large holders· Schedule 13D/G beneficial owners · CECO

Institutional ownership· 13F filers holding CECO · 2026-Q1 methodology → sources →

Top holders

Holder trends· top 15 holders · shares held over 6 quarters

Institutional footprint by quarter

Activists & large holders· Schedule 13D/G beneficial owners · CECO

CECO US Equity