OSS US Equity

ONE STOP SYSTEMS, INC.

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Information Technology · Electronic Computers · CIK 1394056 · FYE 1231

$11.75

-0.86 (-6.82%)

USD · as of 2026-07-28 · marketstack

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

76 holders

% of shares outstanding held

33.6%

Shares held (13F)

8,330,071

Reporting holders

Top holders

largest 76 of 76 · Δ vs 2025-Q4

#	Holder	Shares	Value	% of shares out	Δ QoQ
1	VANGUARD CAPITAL MANAGEMENT LLC	959,588959,588	$7M	3.87%	NEW†
2	JANE STREET GROUP, LLC	874,558874,558	$7M	3.53%	ADD 45%
3	BlackRock, Inc.	597,303597,303	$5M	2.41%	ADD 335%
4	BARD ASSOCIATES INC	540,666540,666	$4M	2.18%	TRIM -36%
5	MORGAN STANLEY	431,919431,919	$3M	1.74%	ADD 594%
6	MARSHALL WACE, LLP	418,978418,978	$3M	1.69%	ADD 53%
7	UBS Group AG	407,014407,014	$3M	1.64%	ADD 5705%
8	MILLENNIUM MANAGEMENT LLC	400,729400,729	$3M	1.62%	ADD 865%
9	CITADEL ADVISORS LLC	356,676356,676	$3M	1.44%	ADD 145%
10	RENAISSANCE TECHNOLOGIES LLC	259,960259,960	$2M	1.05%	TRIM -31%
11	DNB Asset Management AS	252,733252,733	$2M	1.02%	ADD 65%
12	GEODE CAPITAL MANAGEMENT, LLC	252,453252,453	$2M	1.02%	ADD 6%
13	SUSQUEHANNA INTERNATIONAL GROUP, LLP	236,299236,299	$2M	0.95%	TRIM -9%
14	Trexquant Investment LP	217,829217,829	$2M	0.88%	TRIM -15%
15	SEI INVESTMENTS CO	166,632166,632	$1M	0.67%	ADD 67%
16	Cambridge Investment Research Advisors, Inc.	145,624145,624	$1M	0.59%	ADD 29%
17	Informed Momentum Co LLC	135,989135,989	$1M	0.55%	TRIM -17%
18	VANGUARD FIDUCIARY TRUST CO	128,759128,759	$974,706	0.52%	NEW
19	STATE STREET CORP	101,676101,676	$769,687	0.41%	ADD 20%
20	THOMPSON SIEGEL & WALMSLEY LLC	96,96396,963	$734,000	0.39%	TRIM -37%
21	HRT FINANCIAL LP	79,00579,005	$598,000	0.32%	NEW
22	GOLDMAN SACHS GROUP INC	77,03677,036	$583,163	0.31%	TRIM -40%
23	CITIGROUP INC	75,68875,688	$572,958	0.31%	ADD 1572%
24	MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.	73,86573,865	$559,158	0.30%	NEW
25	Eddie Patel Inc	67,05967,059	$507,638	0.27%	NEW
26	OXFORD ASSET MANAGEMENT LLP	64,40364,403	$487,531	0.26%	NEW
27	Virtu Financial LLC	61,45861,458	$465,000	0.25%	NEW
28	683 Capital Management, LLC	60,00060,000	$454,200	0.24%	TRIM -34%
29	Squarepoint Ops LLC	58,47658,476	$442,663	0.24%	TRIM -60%
30	XTX Topco Ltd	50,86250,862	$385,025	0.21%	TRIM -7%
31	NORTHERN TRUST CORP	46,97446,974	$355,593	0.19%	ADD 12%
32	Penbrook Management LLC	46,74046,740	$353,821	0.19%	—
33	Brevan Howard Capital Management LP	43,17143,171	$326,804	0.17%	ADD 53%
34	STIFEL FINANCIAL CORP	37,91337,913	$287,001	0.15%	NEW
35	Hudson Bay Capital Management LP	37,37637,376	$282,936	0.15%	ADD 14%
36	ESSEX INVESTMENT MANAGEMENT CO LLC	35,53435,534	$268,992	0.14%	TRIM -49%
37	Centiva Capital, LP	33,62733,627	$254,556	0.14%	ADD 193%
38	Schonfeld Strategic Advisors LLC	29,48029,480	$223,163	0.12%	TRIM -9%
39	Engineers Gate Manager LP	29,00029,000	$219,530	0.12%	TRIM -14%
40	Hillsdale Investment Management Inc.	28,84428,844	$218,349	0.12%	TRIM -6%
41	SG Americas Securities, LLC	28,02228,022	$212,000	0.11%	NEW
42	MANGROVE PARTNERS IM, LLC	23,88923,889	$180,840	0.10%	NEW
43	BANK OF AMERICA CORP /DE/	23,23923,239	$175,919	0.09%	ADD 129006%
44	Apollon Wealth Management, LLC	21,04021,040	$159,273	0.08%	NEW
45	BARCLAYS PLC	20,50320,503	$155,208	0.08%	TRIM -11%
46	BAKER TILLY WEALTH MANAGEMENT, LLC	20,00020,000	$151,400	0.08%	—
47	LANDSCAPE CAPITAL MANAGEMENT, L.L.C.	17,26917,269	$130,726	0.07%	NEW
48	OCCUDO QUANTITATIVE STRATEGIES LP	13,73813,738	$130,374	0.06%	TRIM -61%
49	Anfield Capital Management, LLC	17,00017,000	$128,690	0.07%	NEW
50	OMERS ADMINISTRATION Corp	15,20015,200	$115,064	0.06%	TRIM -68%
51	CHARLES SCHWAB INVESTMENT MANAGEMENT INC	12,91112,911	$97,736	0.05%	—
52	McAdam, LLC	12,74612,746	$96,487	0.05%	—
53	CHOREO, LLC	11,30611,306	$85,589	0.05%	NEW
54	IMC-Chicago, LLC	11,18711,187	$84,686	0.05%	NEW
55	Strait & Sound Wealth Management LLC	11,04411,044	$83,603	0.04%	NEW
56	Vanguard Global Advisers, LLC	10,81910,819	$81,900	0.04%	NEW
57	NKCFO LLC	10,00010,000	$76,000	0.04%	TRIM -23%
58	Lodestone Wealth Management LLC	6,8036,803	$51,499	0.03%	NEW
59	Tower Research Capital LLC (TRC)	4,7544,754	$35,988	0.02%	TRIM -75%
60	Smartleaf Asset Management LLC	4,0004,000	$28,840	0.02%	—
61	Caitong International Asset Management Co., Ltd	3,6323,632	$27,494	0.01%	NEW
62	Arax Advisory Partners	2,4712,471	$22,046	0.01%	ADD 409%
63	Advisory Services Network, LLC	2,3412,341	$17,723	0.01%	NEW
64	BNP PARIBAS FINANCIAL MARKETS	1,9961,996	$15,110	0.01%	TRIM -99%
65	OSAIC HOLDINGS, INC.	1,6271,627	$12,315	0.01%	ADD 81%
66	WELLS FARGO & COMPANY/MN	1,0001,000	$7,570	0.00%	—
67	Lynrock Lake LP	666666	$5,042	0.00%	TRIM -100%
68	Hurley Capital, LLC	622622	$4,709	0.00%	NEW
69	ROYAL BANK OF CANADA	552552	$4,000	0.00%	ADD 144%
70	MAI Capital Management	226226	$1,711	0.00%	NEW
71	Steward Partners Investment Advisory, LLC	200200	$1,514	0.00%	NEW
72	JONES FINANCIAL COMPANIES LLLP	174174	$1,334	0.00%	NEW
73	Strive Financial Group ,LLC	100100	$1,000	0.00%	—
74	Root Financial Partners, LLC	6565	$492	0.00%	NEW
75	FMR LLC	5656	$421	0.00%	NEW
76	SBI Securities Co., Ltd.	1414	$106	0.00%	ADD 1300%

† 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

VANGUARD CAPITAL MANAGEMENT LLC

—

960K

$7M

JANE STREET GROUP, LLC

13K

16K

268K

326K

604K

875K

$7M

BlackRock, Inc.

94K

95K

92K

94K

137K

597K

$5M

BARD ASSOCIATES INC

1.0M

948K

917K

851K

541K

$4M

MORGAN STANLEY

19K

32K

73K

56K

62K

432K

$3M

MARSHALL WACE, LLP

—

39K

476K

501K

274K

419K

$3M

UBS Group AG

26K

21K

407K

$3M

MILLENNIUM MANAGEMENT LLC

42K

—

21K

42K

401K

$3M

CITADEL ADVISORS LLC

97K

30K

154K

865K

146K

357K

$3M

RENAISSANCE TECHNOLOGIES LLC

70K

93K

102K

393K

376K

260K

$2M

DNB Asset Management AS

—

16K

153K

253K

$2M

GEODE CAPITAL MANAGEMENT, LLC

190K

198K

200K

211K

238K

252K

$2M

SUSQUEHANNA INTERNATIONAL GROUP, LLP

12K

56K

180K

259K

236K

$2M

Trexquant Investment LP

—

93K

257K

218K

$2M

SEI INVESTMENTS CO

—

100K

167K

$1M

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	76	8,330,071	33.6%	$63M
2025-Q4	69	9,298,038	37.5%	$67M
2025-Q3	59	9,713,093	39.2%	$52M
2025-Q2	39	6,432,455	26.0%	$23M
2025-Q1	33	5,322,190	21.5%	$12M
2024-Q4	37	5,275,157	21.3%	$18M
2024-Q3	27	5,064,262	20.4%	$12M

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 · OSS

Large holders — 13G, passive (top 1 by % of class)

Holder

% of class

Type

As of

Galkin Vladimir

Passive

2026-07-24

SEC →

Source: SEC Schedule 13D/13G structured XML. 13D = active intent; 13G filers report passively (Rule 13d-1(b) QII / 13d-1(c) Passive / 13d-1(d) Exempt) and are not activists. Percent and delta are the group aggregate the filing reports. Structured 13D/G coverage begins December 2024 (SEC XML mandate).

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

76 holders

% of shares outstanding held

33.6%

Shares held (13F)

8,330,071

Reporting holders

Top holders

largest 76 of 76 · Δ vs 2025-Q4

#	Holder	Shares	Value	% of shares out	Δ QoQ
1	VANGUARD CAPITAL MANAGEMENT LLC	959,588959,588	$7M	3.87%	NEW†
2	JANE STREET GROUP, LLC	874,558874,558	$7M	3.53%	ADD 45%
3	BlackRock, Inc.	597,303597,303	$5M	2.41%	ADD 335%
4	BARD ASSOCIATES INC	540,666540,666	$4M	2.18%	TRIM -36%
5	MORGAN STANLEY	431,919431,919	$3M	1.74%	ADD 594%
6	MARSHALL WACE, LLP	418,978418,978	$3M	1.69%	ADD 53%
7	UBS Group AG	407,014407,014	$3M	1.64%	ADD 5705%
8	MILLENNIUM MANAGEMENT LLC	400,729400,729	$3M	1.62%	ADD 865%
9	CITADEL ADVISORS LLC	356,676356,676	$3M	1.44%	ADD 145%
10	RENAISSANCE TECHNOLOGIES LLC	259,960259,960	$2M	1.05%	TRIM -31%
11	DNB Asset Management AS	252,733252,733	$2M	1.02%	ADD 65%
12	GEODE CAPITAL MANAGEMENT, LLC	252,453252,453	$2M	1.02%	ADD 6%
13	SUSQUEHANNA INTERNATIONAL GROUP, LLP	236,299236,299	$2M	0.95%	TRIM -9%
14	Trexquant Investment LP	217,829217,829	$2M	0.88%	TRIM -15%
15	SEI INVESTMENTS CO	166,632166,632	$1M	0.67%	ADD 67%
16	Cambridge Investment Research Advisors, Inc.	145,624145,624	$1M	0.59%	ADD 29%
17	Informed Momentum Co LLC	135,989135,989	$1M	0.55%	TRIM -17%
18	VANGUARD FIDUCIARY TRUST CO	128,759128,759	$974,706	0.52%	NEW
19	STATE STREET CORP	101,676101,676	$769,687	0.41%	ADD 20%
20	THOMPSON SIEGEL & WALMSLEY LLC	96,96396,963	$734,000	0.39%	TRIM -37%
21	HRT FINANCIAL LP	79,00579,005	$598,000	0.32%	NEW
22	GOLDMAN SACHS GROUP INC	77,03677,036	$583,163	0.31%	TRIM -40%
23	CITIGROUP INC	75,68875,688	$572,958	0.31%	ADD 1572%
24	MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.	73,86573,865	$559,158	0.30%	NEW
25	Eddie Patel Inc	67,05967,059	$507,638	0.27%	NEW
26	OXFORD ASSET MANAGEMENT LLP	64,40364,403	$487,531	0.26%	NEW
27	Virtu Financial LLC	61,45861,458	$465,000	0.25%	NEW
28	683 Capital Management, LLC	60,00060,000	$454,200	0.24%	TRIM -34%
29	Squarepoint Ops LLC	58,47658,476	$442,663	0.24%	TRIM -60%
30	XTX Topco Ltd	50,86250,862	$385,025	0.21%	TRIM -7%
31	NORTHERN TRUST CORP	46,97446,974	$355,593	0.19%	ADD 12%
32	Penbrook Management LLC	46,74046,740	$353,821	0.19%	—
33	Brevan Howard Capital Management LP	43,17143,171	$326,804	0.17%	ADD 53%
34	STIFEL FINANCIAL CORP	37,91337,913	$287,001	0.15%	NEW
35	Hudson Bay Capital Management LP	37,37637,376	$282,936	0.15%	ADD 14%
36	ESSEX INVESTMENT MANAGEMENT CO LLC	35,53435,534	$268,992	0.14%	TRIM -49%
37	Centiva Capital, LP	33,62733,627	$254,556	0.14%	ADD 193%
38	Schonfeld Strategic Advisors LLC	29,48029,480	$223,163	0.12%	TRIM -9%
39	Engineers Gate Manager LP	29,00029,000	$219,530	0.12%	TRIM -14%
40	Hillsdale Investment Management Inc.	28,84428,844	$218,349	0.12%	TRIM -6%
41	SG Americas Securities, LLC	28,02228,022	$212,000	0.11%	NEW
42	MANGROVE PARTNERS IM, LLC	23,88923,889	$180,840	0.10%	NEW
43	BANK OF AMERICA CORP /DE/	23,23923,239	$175,919	0.09%	ADD 129006%
44	Apollon Wealth Management, LLC	21,04021,040	$159,273	0.08%	NEW
45	BARCLAYS PLC	20,50320,503	$155,208	0.08%	TRIM -11%
46	BAKER TILLY WEALTH MANAGEMENT, LLC	20,00020,000	$151,400	0.08%	—
47	LANDSCAPE CAPITAL MANAGEMENT, L.L.C.	17,26917,269	$130,726	0.07%	NEW
48	OCCUDO QUANTITATIVE STRATEGIES LP	13,73813,738	$130,374	0.06%	TRIM -61%
49	Anfield Capital Management, LLC	17,00017,000	$128,690	0.07%	NEW
50	OMERS ADMINISTRATION Corp	15,20015,200	$115,064	0.06%	TRIM -68%
51	CHARLES SCHWAB INVESTMENT MANAGEMENT INC	12,91112,911	$97,736	0.05%	—
52	McAdam, LLC	12,74612,746	$96,487	0.05%	—
53	CHOREO, LLC	11,30611,306	$85,589	0.05%	NEW
54	IMC-Chicago, LLC	11,18711,187	$84,686	0.05%	NEW
55	Strait & Sound Wealth Management LLC	11,04411,044	$83,603	0.04%	NEW
56	Vanguard Global Advisers, LLC	10,81910,819	$81,900	0.04%	NEW
57	NKCFO LLC	10,00010,000	$76,000	0.04%	TRIM -23%
58	Lodestone Wealth Management LLC	6,8036,803	$51,499	0.03%	NEW
59	Tower Research Capital LLC (TRC)	4,7544,754	$35,988	0.02%	TRIM -75%
60	Smartleaf Asset Management LLC	4,0004,000	$28,840	0.02%	—
61	Caitong International Asset Management Co., Ltd	3,6323,632	$27,494	0.01%	NEW
62	Arax Advisory Partners	2,4712,471	$22,046	0.01%	ADD 409%
63	Advisory Services Network, LLC	2,3412,341	$17,723	0.01%	NEW
64	BNP PARIBAS FINANCIAL MARKETS	1,9961,996	$15,110	0.01%	TRIM -99%
65	OSAIC HOLDINGS, INC.	1,6271,627	$12,315	0.01%	ADD 81%
66	WELLS FARGO & COMPANY/MN	1,0001,000	$7,570	0.00%	—
67	Lynrock Lake LP	666666	$5,042	0.00%	TRIM -100%
68	Hurley Capital, LLC	622622	$4,709	0.00%	NEW
69	ROYAL BANK OF CANADA	552552	$4,000	0.00%	ADD 144%
70	MAI Capital Management	226226	$1,711	0.00%	NEW
71	Steward Partners Investment Advisory, LLC	200200	$1,514	0.00%	NEW
72	JONES FINANCIAL COMPANIES LLLP	174174	$1,334	0.00%	NEW
73	Strive Financial Group ,LLC	100100	$1,000	0.00%	—
74	Root Financial Partners, LLC	6565	$492	0.00%	NEW
75	FMR LLC	5656	$421	0.00%	NEW
76	SBI Securities Co., Ltd.	1414	$106	0.00%	ADD 1300%

† 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

VANGUARD CAPITAL MANAGEMENT LLC

—

960K

$7M

JANE STREET GROUP, LLC

13K

16K

268K

326K

604K

875K

$7M

BlackRock, Inc.

94K

95K

92K

94K

137K

597K

$5M

BARD ASSOCIATES INC

1.0M

948K

917K

851K

541K

$4M

MORGAN STANLEY

19K

32K

73K

56K

62K

432K

$3M

MARSHALL WACE, LLP

—

39K

476K

501K

274K

419K

$3M

UBS Group AG

26K

21K

407K

$3M

MILLENNIUM MANAGEMENT LLC

42K

—

21K

42K

401K

$3M

CITADEL ADVISORS LLC

97K

30K

154K

865K

146K

357K

$3M

RENAISSANCE TECHNOLOGIES LLC

70K

93K

102K

393K

376K

260K

$2M

DNB Asset Management AS

—

16K

153K

253K

$2M

GEODE CAPITAL MANAGEMENT, LLC

190K

198K

200K

211K

238K

252K

$2M

SUSQUEHANNA INTERNATIONAL GROUP, LLP

12K

56K

180K

259K

236K

$2M

Trexquant Investment LP

—

93K

257K

218K

$2M

SEI INVESTMENTS CO

—

100K

167K

$1M

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	76	8,330,071	33.6%	$63M
2025-Q4	69	9,298,038	37.5%	$67M
2025-Q3	59	9,713,093	39.2%	$52M
2025-Q2	39	6,432,455	26.0%	$23M
2025-Q1	33	5,322,190	21.5%	$12M
2024-Q4	37	5,275,157	21.3%	$18M
2024-Q3	27	5,064,262	20.4%	$12M

Short interest has its own tab now — open SI →

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

Large holders — 13G, passive (top 1 by % of class)

Holder

% of class

Type

As of

Galkin Vladimir

Passive

2026-07-24

SEC →

OSS US Equity☆

Institutional ownership· 13F filers holding OSS · 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 · OSS

Institutional ownership· 13F filers holding OSS · 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 · OSS

OSS US Equity