HIO

WESTERN ASSET HIGH INCOME OPPORTUNITY FUND INC.

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CIK 910068

$3.51

+0.00 (+0.00%)

USD · as of 2026-07-28 · marketstack

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

118 holders

% of shares outstanding held

—

Shares held (13F)

32,337,436

Reporting holders

118

Top holders

largest 100 of 118 · Δ vs 2025-Q4

#	Holder	Shares	Value	% of shares out	Δ QoQ
1	MORGAN STANLEY	11,392,74711.4M	$41M	—	ADD 18%
2	SIT INVESTMENT ASSOCIATES INC	2,812,2782.8M	$10M	—	ADD 26%
3	Capital Investment Advisors, LLC	2,539,0122.5M	$9M	—	TRIM -12%
4	Penserra Capital Management LLC	1,596,1201.6M	$6M	—	—
5	Invesco Ltd.	1,354,8931.4M	$5M	—	ADD 11%
6	FCA CORP /TX	1,206,7391.2M	$4M	—	ADD 6%
7	WELLS FARGO & COMPANY/MN	799,149799,149	$3M	—	ADD 3%
8	Rareview Capital LLC	691,641691,641	$3M	—	ADD 21%
9	LPL Financial LLC	752,004752,004	$3M	—	ADD 95%
10	RAYMOND JAMES FINANCIAL INC	664,969664,969	$2M	—	TRIM -5%
11	UBS Group AG	601,872601,872	$2M	—	ADD 13%
12	Thrivent Financial for Lutherans	548,932548,932	$2M	—	ADD 5%
13	Shaker Financial Services, LLC	512,974512,974	$2M	—	TRIM -16%
14	Kanen Wealth Management LLC	490,454490,454	$2M	—	ADD 2%
15	WOLVERINE ASSET MANAGEMENT LLC	470,947470,947	$2M	—	TRIM -26%
16	ABSOLUTE INVESTMENT ADVISERS, LLC	469,158469,158	$2M	—	ADD 43%
17	JONES FINANCIAL COMPANIES LLLP	473,862473,862	$2M	—	ADD 14%
18	Chicago Partners Investment Group LLC	368,306368,306	$1M	—	TRIM -8%
19	BANK OF AMERICA CORP /DE/	316,605316,605	$1M	—	TRIM -12%
20	Quarry LP	305,111305,111	$1M	—	NEW
21	RFG Advisory, LLC	287,063287,063	$1M	—	ADD 59%
22	Pathway Financial Advisers, LLC	279,433279,433	$1M	—	—
23	PIN OAK INVESTMENT ADVISORS INC	233,058233,058	$846,000	—	—
24	FIRST TRUST ADVISORS LP	230,383230,383	$836,290	—	TRIM -4%
25	Fortis Group Advisors, LLC	210,571210,571	$777,006	—	—
26	ENVESTNET ASSET MANAGEMENT INC	169,738169,738	$616,147	—	ADD 28%
27	Calamos Advisors LLC	163,795163,795	$594,576	—	ADD 14%
28	ROYAL BANK OF CANADA	146,113146,113	$530,000	—	TRIM -4%
29	Cetera Investment Advisers	109,681109,681	$398,143	—	ADD 11%
30	COMMONWEALTH EQUITY SERVICES, LLC	98,32298,322	$356,914	—	ADD 71%
31	Steward Partners Investment Advisory, LLC	93,81193,811	$340,534	—	—
32	STIFEL FINANCIAL CORP	91,90291,902	$333,607	—	—
33	OSAIC HOLDINGS, INC.	89,57989,579	$325,167	—	TRIM -18%
34	MELFA WEALTH MANAGEMENT, INC.	78,95078,950	$286,588	—	—
35	TRUIST FINANCIAL CORP	72,15972,159	$261,937	—	—
36	Stratos Wealth Partners, LTD.	59,41659,416	$215,681	—	—
37	NWF Advisory Services Inc.	56,92156,921	$206,623	—	TRIM -12%
38	CHOREO, LLC	55,11555,115	$200,067	—	ADD 19%
39	Everstar Asset Management, LLC	53,18053,180	$193,043	—	—
40	WALLED LAKE PLANNING & WEALTH MANAGEMENT, LLC	50,98550,985	$185,076	—	—
41	Concurrent Investment Advisors, LLC	49,48849,488	$179,641	—	—
42	Cambridge Investment Research Advisors, Inc.	46,40446,404	$168,000	—	—
43	BOOTHBAY FUND MANAGEMENT, LLC	41,21241,212	$149,600	—	TRIM -2%
44	JANE STREET GROUP, LLC	40,79640,796	$148,089	—	TRIM -79%
45	Bay Colony Advisory Group, Inc d/b/a Bay Colony Advisors	40,74540,745	$147,905	—	ADD 2%
46	NOMURA HOLDINGS INC	37,50037,500	$136,125	—	NEW
47	Independent Advisor Alliance	36,87336,873	$133,848	—	NEW
48	SUSQUEHANNA INTERNATIONAL GROUP, LLP	36,32536,325	$131,860	—	—
49	XTX Topco Ltd	35,26835,268	$128,023	—	TRIM -53%
50	Clearstead Advisors, LLC	34,37534,375	$124,781	—	—
51	KELLEHER FINANCIAL ADVISORS	34,30834,308	$124,538	—	ADD 3%
52	Wilson & Boucher Capital Management, LLC	32,97532,975	$119,699	—	TRIM -9%
53	ACCREDITED INVESTOR SERVICES, LLC	31,42231,422	$114,062	—	ADD 31%
54	DUDLEY CAPITAL MANAGEMENT, LLC	31,10031,100	$112,893	—	—
55	MERCER GLOBAL ADVISORS INC /ADV	30,15930,159	$109,477	—	—
56	Integrity Advisory Solutions, LLC	28,70228,702	$104,188	—	ADD 32%
57	CITADEL ADVISORS LLC	28,16928,169	$102,253	—	NEW
58	Mariner, LLC	27,83727,837	$98,550	—	ADD 26%
59	CHAPIN DAVIS, INC.	26,90926,909	$97,681	—	TRIM -8%
60	Uncommon Cents Investing LLC	26,32726,327	$95,567	—	—
61	OPPENHEIMER & CO INC	26,01726,017	$94,442	—	TRIM -36%
62	Merit Financial Group, LLC	25,48425,484	$92,507	—	ADD 26%
63	Virtu Financial LLC	25,26525,265	$92,000	—	NEW
64	Corps Capital Advisors, LLC	25,00025,000	$90,750	—	—
65	PARK AVENUE SECURITIES LLC	24,75424,754	$90,000	—	TRIM -4%
66	FIFTH THIRD BANCORP	22,86122,861	$82,985	—	NEW
67	Samalin Investment Counsel, LLC	22,23522,235	$80,711	—	ADD 3%
68	Creative Planning	22,14722,147	$80,393	—	NEW
69	&PARTNERS	20,56520,565	$74,650	—	ADD 3%
70	Aptus Capital Advisors, LLC	20,28120,281	$73,620	—	—
71	Suncoast Equity Management	20,03620,036	$72,731	—	ADD 6%
72	Advisory Services Network, LLC	19,50019,500	$70,785	—	ADD 11%
73	Cape Investment Advisory, Inc.	18,30018,300	$66,429	—	—
74	Fiera Capital Corp	17,93317,933	$65,097	—	TRIM -58%
75	EVERGREEN CAPITAL MANAGEMENT LLC	16,63416,634	$60,380	—	ADD 4%
76	Private Advisor Group, LLC	16,52516,525	$59,985	—	NEW
77	Savvy Advisors, Inc.	16,44616,446	$59,699	—	NEW
78	FOURPATH CAPITAL MANAGEMENT, LLC	15,46615,466	$56,141	—	—
79	Integrated Wealth Concepts LLC	15,17515,175	$55,085	—	NEW
80	LANDSCAPE CAPITAL MANAGEMENT, L.L.C.	14,82714,827	$53,822	—	TRIM -89%
81	Jackson Hole Capital Partners, LLC	14,20014,200	$51,546	—	—
82	Pekin Hardy Strauss, Inc.	13,97313,973	$50,722	—	—
83	Occidental Asset Management, LLC	13,78613,786	$50,043	—	ADD 20%
84	Pinnacle Wealth Planning Services, Inc.	13,40513,405	$48,660	—	ADD 23%
85	TWO SIGMA SECURITIES, LLC	13,36013,360	$48,497	—	TRIM -37%
86	One Capital Management, LLC	12,89512,895	$46,808	—	ADD 10%
87	STEEL GROVE CAPITAL ADVISORS, LLC	11,98911,989	$43,520	—	—
88	WEDBUSH SECURITIES INC	11,84311,843	$43,000	—	—
89	Equitable Holdings, Inc.	11,42911,429	$42,402	—	ADD 2%
90	RPg Family Wealth Advisory, LLC	11,66711,667	$42,351	—	NEW
91	PCM Encore, LLC	11,38711,387	$41,335	—	NEW
92	LAUREL OAK WEALTH MANAGEMENT, LLC	10,91310,913	$39,614	—	—
93	PNC FINANCIAL SERVICES GROUP, INC.	10,90010,900	$39,567	—	—
94	Nova Wealth Management, Inc.	10,45010,450	$37,934	—	—
95	High Net Worth Advisory Group LLC	10,35510,355	$37,592	—	ADD 3%
96	Stonebrook Private Inc.	10,16810,168	$36,909	—	NEW
97	US BANCORP \DE\	8,0008,000	$29,040	—	—
98	MAI Capital Management	6,4676,467	$23,476	—	TRIM -40%
99	Axiom Investment Management LLC	6,2556,255	$22,706	—	NEW
100	WPG Advisers, LLC	5,6345,634	$20,451	—	ADD 34%

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

MORGAN STANLEY

7.2M

8.0M

8.9M

9.3M

9.6M

11.4M

$41M

SIT INVESTMENT ASSOCIATES INC

1.3M

1.0M

1.7M

2.2M

2.8M

$10M

Capital Investment Advisors, LLC

3.5M

3.4M

3.1M

2.9M

2.5M

$9M

Penserra Capital Management LLC

1.3M

1.2M

1.4M

1.6M

$6M

Invesco Ltd.

1.2M

996K

1.0M

1.2M

1.4M

$5M

FCA CORP /TX

1.1M

1.2M

1.1M

1.2M

$4M

WELLS FARGO & COMPANY/MN

666K

522K

657K

684K

776K

799K

$3M

Rareview Capital LLC

686K

—

572K

692K

$3M

LPL Financial LLC

278K

137K

245K

279K

385K

752K

$3M

RAYMOND JAMES FINANCIAL INC

702K

769K

686K

708K

703K

665K

$2M

UBS Group AG

482K

535K

472K

753K

535K

602K

$2M

Thrivent Financial for Lutherans

524K

549K

$2M

Shaker Financial Services, LLC

27K

—

200K

211K

614K

513K

$2M

Kanen Wealth Management LLC

—

364K

393K

697K

480K

490K

$2M

WOLVERINE ASSET MANAGEMENT LLC

—

265K

640K

471K

$2M

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

Holder count only — too few computable %-of-shares-outstanding quarters for a % pane. Line breaks are quarters with no 13F record, never interpolated.

Quarter	Holders	Shares held	% shares out	Value held
2026-Q1	118	32,337,436	—	$118M
2025-Q4	115	30,131,456	—	$112M
2025-Q3	103	27,773,527	—	$107M
2025-Q2	98	25,760,820	—	$106M
2025-Q1	97	25,334,974	—	$101M
2024-Q4	101	28,830,044

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.

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

118 holders

% of shares outstanding held

—

Shares held (13F)

32,337,436

Reporting holders

118

Top holders

largest 100 of 118 · Δ vs 2025-Q4

#	Holder	Shares	Value	% of shares out	Δ QoQ
1	MORGAN STANLEY	11,392,74711.4M	$41M	—	ADD 18%
2	SIT INVESTMENT ASSOCIATES INC	2,812,2782.8M	$10M	—	ADD 26%
3	Capital Investment Advisors, LLC	2,539,0122.5M	$9M	—	TRIM -12%
4	Penserra Capital Management LLC	1,596,1201.6M	$6M	—	—
5	Invesco Ltd.	1,354,8931.4M	$5M	—	ADD 11%
6	FCA CORP /TX	1,206,7391.2M	$4M	—	ADD 6%
7	WELLS FARGO & COMPANY/MN	799,149799,149	$3M	—	ADD 3%
8	Rareview Capital LLC	691,641691,641	$3M	—	ADD 21%
9	LPL Financial LLC	752,004752,004	$3M	—	ADD 95%
10	RAYMOND JAMES FINANCIAL INC	664,969664,969	$2M	—	TRIM -5%
11	UBS Group AG	601,872601,872	$2M	—	ADD 13%
12	Thrivent Financial for Lutherans	548,932548,932	$2M	—	ADD 5%
13	Shaker Financial Services, LLC	512,974512,974	$2M	—	TRIM -16%
14	Kanen Wealth Management LLC	490,454490,454	$2M	—	ADD 2%
15	WOLVERINE ASSET MANAGEMENT LLC	470,947470,947	$2M	—	TRIM -26%
16	ABSOLUTE INVESTMENT ADVISERS, LLC	469,158469,158	$2M	—	ADD 43%
17	JONES FINANCIAL COMPANIES LLLP	473,862473,862	$2M	—	ADD 14%
18	Chicago Partners Investment Group LLC	368,306368,306	$1M	—	TRIM -8%
19	BANK OF AMERICA CORP /DE/	316,605316,605	$1M	—	TRIM -12%
20	Quarry LP	305,111305,111	$1M	—	NEW
21	RFG Advisory, LLC	287,063287,063	$1M	—	ADD 59%
22	Pathway Financial Advisers, LLC	279,433279,433	$1M	—	—
23	PIN OAK INVESTMENT ADVISORS INC	233,058233,058	$846,000	—	—
24	FIRST TRUST ADVISORS LP	230,383230,383	$836,290	—	TRIM -4%
25	Fortis Group Advisors, LLC	210,571210,571	$777,006	—	—
26	ENVESTNET ASSET MANAGEMENT INC	169,738169,738	$616,147	—	ADD 28%
27	Calamos Advisors LLC	163,795163,795	$594,576	—	ADD 14%
28	ROYAL BANK OF CANADA	146,113146,113	$530,000	—	TRIM -4%
29	Cetera Investment Advisers	109,681109,681	$398,143	—	ADD 11%
30	COMMONWEALTH EQUITY SERVICES, LLC	98,32298,322	$356,914	—	ADD 71%
31	Steward Partners Investment Advisory, LLC	93,81193,811	$340,534	—	—
32	STIFEL FINANCIAL CORP	91,90291,902	$333,607	—	—
33	OSAIC HOLDINGS, INC.	89,57989,579	$325,167	—	TRIM -18%
34	MELFA WEALTH MANAGEMENT, INC.	78,95078,950	$286,588	—	—
35	TRUIST FINANCIAL CORP	72,15972,159	$261,937	—	—
36	Stratos Wealth Partners, LTD.	59,41659,416	$215,681	—	—
37	NWF Advisory Services Inc.	56,92156,921	$206,623	—	TRIM -12%
38	CHOREO, LLC	55,11555,115	$200,067	—	ADD 19%
39	Everstar Asset Management, LLC	53,18053,180	$193,043	—	—
40	WALLED LAKE PLANNING & WEALTH MANAGEMENT, LLC	50,98550,985	$185,076	—	—
41	Concurrent Investment Advisors, LLC	49,48849,488	$179,641	—	—
42	Cambridge Investment Research Advisors, Inc.	46,40446,404	$168,000	—	—
43	BOOTHBAY FUND MANAGEMENT, LLC	41,21241,212	$149,600	—	TRIM -2%
44	JANE STREET GROUP, LLC	40,79640,796	$148,089	—	TRIM -79%
45	Bay Colony Advisory Group, Inc d/b/a Bay Colony Advisors	40,74540,745	$147,905	—	ADD 2%
46	NOMURA HOLDINGS INC	37,50037,500	$136,125	—	NEW
47	Independent Advisor Alliance	36,87336,873	$133,848	—	NEW
48	SUSQUEHANNA INTERNATIONAL GROUP, LLP	36,32536,325	$131,860	—	—
49	XTX Topco Ltd	35,26835,268	$128,023	—	TRIM -53%
50	Clearstead Advisors, LLC	34,37534,375	$124,781	—	—
51	KELLEHER FINANCIAL ADVISORS	34,30834,308	$124,538	—	ADD 3%
52	Wilson & Boucher Capital Management, LLC	32,97532,975	$119,699	—	TRIM -9%
53	ACCREDITED INVESTOR SERVICES, LLC	31,42231,422	$114,062	—	ADD 31%
54	DUDLEY CAPITAL MANAGEMENT, LLC	31,10031,100	$112,893	—	—
55	MERCER GLOBAL ADVISORS INC /ADV	30,15930,159	$109,477	—	—
56	Integrity Advisory Solutions, LLC	28,70228,702	$104,188	—	ADD 32%
57	CITADEL ADVISORS LLC	28,16928,169	$102,253	—	NEW
58	Mariner, LLC	27,83727,837	$98,550	—	ADD 26%
59	CHAPIN DAVIS, INC.	26,90926,909	$97,681	—	TRIM -8%
60	Uncommon Cents Investing LLC	26,32726,327	$95,567	—	—
61	OPPENHEIMER & CO INC	26,01726,017	$94,442	—	TRIM -36%
62	Merit Financial Group, LLC	25,48425,484	$92,507	—	ADD 26%
63	Virtu Financial LLC	25,26525,265	$92,000	—	NEW
64	Corps Capital Advisors, LLC	25,00025,000	$90,750	—	—
65	PARK AVENUE SECURITIES LLC	24,75424,754	$90,000	—	TRIM -4%
66	FIFTH THIRD BANCORP	22,86122,861	$82,985	—	NEW
67	Samalin Investment Counsel, LLC	22,23522,235	$80,711	—	ADD 3%
68	Creative Planning	22,14722,147	$80,393	—	NEW
69	&PARTNERS	20,56520,565	$74,650	—	ADD 3%
70	Aptus Capital Advisors, LLC	20,28120,281	$73,620	—	—
71	Suncoast Equity Management	20,03620,036	$72,731	—	ADD 6%
72	Advisory Services Network, LLC	19,50019,500	$70,785	—	ADD 11%
73	Cape Investment Advisory, Inc.	18,30018,300	$66,429	—	—
74	Fiera Capital Corp	17,93317,933	$65,097	—	TRIM -58%
75	EVERGREEN CAPITAL MANAGEMENT LLC	16,63416,634	$60,380	—	ADD 4%
76	Private Advisor Group, LLC	16,52516,525	$59,985	—	NEW
77	Savvy Advisors, Inc.	16,44616,446	$59,699	—	NEW
78	FOURPATH CAPITAL MANAGEMENT, LLC	15,46615,466	$56,141	—	—
79	Integrated Wealth Concepts LLC	15,17515,175	$55,085	—	NEW
80	LANDSCAPE CAPITAL MANAGEMENT, L.L.C.	14,82714,827	$53,822	—	TRIM -89%
81	Jackson Hole Capital Partners, LLC	14,20014,200	$51,546	—	—
82	Pekin Hardy Strauss, Inc.	13,97313,973	$50,722	—	—
83	Occidental Asset Management, LLC	13,78613,786	$50,043	—	ADD 20%
84	Pinnacle Wealth Planning Services, Inc.	13,40513,405	$48,660	—	ADD 23%
85	TWO SIGMA SECURITIES, LLC	13,36013,360	$48,497	—	TRIM -37%
86	One Capital Management, LLC	12,89512,895	$46,808	—	ADD 10%
87	STEEL GROVE CAPITAL ADVISORS, LLC	11,98911,989	$43,520	—	—
88	WEDBUSH SECURITIES INC	11,84311,843	$43,000	—	—
89	Equitable Holdings, Inc.	11,42911,429	$42,402	—	ADD 2%
90	RPg Family Wealth Advisory, LLC	11,66711,667	$42,351	—	NEW
91	PCM Encore, LLC	11,38711,387	$41,335	—	NEW
92	LAUREL OAK WEALTH MANAGEMENT, LLC	10,91310,913	$39,614	—	—
93	PNC FINANCIAL SERVICES GROUP, INC.	10,90010,900	$39,567	—	—
94	Nova Wealth Management, Inc.	10,45010,450	$37,934	—	—
95	High Net Worth Advisory Group LLC	10,35510,355	$37,592	—	ADD 3%
96	Stonebrook Private Inc.	10,16810,168	$36,909	—	NEW
97	US BANCORP \DE\	8,0008,000	$29,040	—	—
98	MAI Capital Management	6,4676,467	$23,476	—	TRIM -40%
99	Axiom Investment Management LLC	6,2556,255	$22,706	—	NEW
100	WPG Advisers, LLC	5,6345,634	$20,451	—	ADD 34%

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

MORGAN STANLEY

7.2M

8.0M

8.9M

9.3M

9.6M

11.4M

$41M

SIT INVESTMENT ASSOCIATES INC

1.3M

1.0M

1.7M

2.2M

2.8M

$10M

Capital Investment Advisors, LLC

3.5M

3.4M

3.1M

2.9M

2.5M

$9M

Penserra Capital Management LLC

1.3M

1.2M

1.4M

1.6M

$6M

Invesco Ltd.

1.2M

996K

1.0M

1.2M

1.4M

$5M

FCA CORP /TX

1.1M

1.2M

1.1M

1.2M

$4M

WELLS FARGO & COMPANY/MN

666K

522K

657K

684K

776K

799K

$3M

Rareview Capital LLC

686K

—

572K

692K

$3M

LPL Financial LLC

278K

137K

245K

279K

385K

752K

$3M

RAYMOND JAMES FINANCIAL INC

702K

769K

686K

708K

703K

665K

$2M

UBS Group AG

482K

535K

472K

753K

535K

602K

$2M

Thrivent Financial for Lutherans

524K

549K

$2M

Shaker Financial Services, LLC

27K

—

200K

211K

614K

513K

$2M

Kanen Wealth Management LLC

—

364K

393K

697K

480K

490K

$2M

WOLVERINE ASSET MANAGEMENT LLC

—

265K

640K

471K

$2M

Institutional footprint by quarter

Holder count only — too few computable %-of-shares-outstanding quarters for a % pane. Line breaks are quarters with no 13F record, never interpolated.

Quarter	Holders	Shares held	% shares out	Value held
2026-Q1	118	32,337,436	—	$118M
2025-Q4	115	30,131,456	—	$112M
2025-Q3	103	27,773,527	—	$107M
2025-Q2	98	25,760,820	—	$106M
2025-Q1	97	25,334,974	—	$101M
2024-Q4	101	28,830,044

Short interest has its own tab now — open SI →

HIO☆

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

Top holders

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

Institutional footprint by quarter

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

Top holders

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

Institutional footprint by quarter

HIO