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Simplex Trading Portfolio holdings
AUM
$184B
Turnover
28.44%
1-Year Est. Return
51.71%
Simplex Trading is a market maker that trades for its own account, mainly in US stock options and options on futures, using software it builds itself. Its work pairs software developers with data-driven traders. It was founded in Chicago in 2004, and Erik Swanson, who joined straight out of college as a trader, has been its chief executive since 2014. It also invests in early-stage financial and technology start-ups.
This Fund
S&P 500
This Quarter Est. Return
-0.22%
1 Year Est. Return
+51.71%
3 Year Est. Return
+194.66%
5 Year Est. Return
+164.83%
10 Year Est. Return
+968.67%
AUM
$184B
AUM Growth
+$13.3B
(+7.8%)
Cap. Flow
-$519M
Cap. Flow % of AUM
Cap. Flow %
-0.28%
Top 10 Holdings %
Top 10 Hldgs %
50.68%
Holding
10,644
New
1,493
Increased
3,697
Reduced
3,633
Closed
1,534
Avg Time Held
Equity + Options
3
years
Top 10 Avg Time Held
Equity + Options
3.9
years
Top 20 Avg Time Held
Equity + Options
4.3
years
Avg Time Held Equity only
0.5
years
Top 10 Avg Time Held Equity only
0.5
years
Top 20 Avg Time Held Equity only
0.4
years
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$92.6M |
| 2 |
iShares iBoxx $ High Yield Corporate Bond ETF
HYG
|
+$80.6M |
| 3 |
Amazon
AMZN
|
+$26.3M |
| 4 |
State Street Industrial Select Sector SPDR ETF
XLI
|
+$25.7M |
| 5 |
SPDR Gold Trust
GLD
|
+$20.7M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Alphabet (Google) Class A
GOOGL
|
+$128M |
| 2 |
NVIDIA
NVDA
|
+$97.8M |
| 3 |
Tesla
TSLA
|
+$53.9M |
| 4 |
Micron Technology
MU
|
+$50M |
| 5 |
United States Oil Fund
USO
|
+$49.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Miscellaneous | 98.84% |
| 2 | Technology | 0.45% |
| 3 | Consumer Discretionary | 0.14% |
| 4 | Healthcare | 0.14% |
| 5 | Financials | 0.1% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | Held Since | |
|---|---|---|---|---|---|---|---|
4576
PUT
Fresenius Medical Care
FMS
$11.4B
| $210K | ﹤0.01% |
9,400
-11,100
| -54% | -$261K |
2025 Q4
3 quarters
|
|
4577
Hafnia
HAFN
$5.13B
| $210K | ﹤0.01% |
21,148
+14,114
| +201% | +$115K |
2025 Q4
3 quarters
|
|
4578
CALL
DELISTED
LiveRamp
RAMP
| $210K | ﹤0.01% |
5,600
-2,200
| -28% | -$83K |
2017 Q4
35 quarters
|
|
4579
OR Royalties Inc
OR
$6.5B
| $210K | ﹤0.01% |
6,109
+3,197
| +110% | +$107K |
2026 Q2
1 quarter
|
|
4580
PUT
EXL Service
EXLS
$6.52B
| $210K | ﹤0.01% |
6,100
+2,000
| +49% | +$66.7K |
2025 Q2
5 quarters
|
|
4581
PUT
Babcock & Wilcox
BW
$663M
| $210K | ﹤0.01% |
35,900
+9,300
| +35% | +$81.6K |
2026 Q1
2 quarters
|
|
4582
CALL
SES AI
SES
$197M
| $210K | ﹤0.01% |
349,300
+13,600
| +4% | +$8.03K |
2024 Q4
7 quarters
|
|
4583
PUT
Roundhill Neocloud ETF
NCLD
| $210K | ﹤0.01% |
+8,900
| New | +$212K |
2026 Q3
0 quarters
|
|
|
MBGL
4584
CALL
Mobility Global Inc
MBGL
$7.45B
| $209K | ﹤0.01% |
+12,200
| New | +$245K |
2026 Q3
0 quarters
|
|
4585
PUT
Pacific Biosciences
PACB
$612M
| $209K | ﹤0.01% |
88,200
+200
| +0.2% | +$282 |
2026 Q1
2 quarters
|
|
4586
PUT
Americas Gold and Silver
USAS
$845M
| $209K | ﹤0.01% |
47,900
+6,700
| +16% | +$31.8K |
2026 Q1
2 quarters
|
|
4587
PUT
Resideo Technologies
REZI
$3.24B
| $209K | ﹤0.01% |
11,500
+11,400
| +11,400% | +$290K |
2026 Q2
1 quarter
|
|
4588
CALL
Finance of America Companies
FOA
$100M
| $209K | ﹤0.01% |
16,500
-9,700
| -37% | -$197K |
2024 Q4
7 quarters
|
|
4589
PUT
Honda
HMC
$44.5B
| $209K | ﹤0.01% |
6,600
-2,800
| -30% | -$86.2K |
2018 Q2
33 quarters
|
|
4590
Chegg
CHGG
$63.9M
| $208K | ﹤0.01% |
287,237
+78,670
| +38% | +$66.6K |
2025 Q4
3 quarters
|
|
4591
CALL
Powerus Corporation Common Stock
PUSA
$222M
| $208K | ﹤0.01% |
53,700
-8,400
| -14% | -$29.8K |
2026 Q1
2 quarters
|
|
4592
Clearwater Paper
CLW
$235M
| $208K | ﹤0.01% |
10,856
-24,256
| -69% | -$477K |
2024 Q2
9 quarters
|
|
4593
Energizer
ENR
$1.65B
| $208K | ﹤0.01% |
9,723
+9,593
| +7,379% | +$205K |
2026 Q2
1 quarter
|
|
4594
CALL
Abeona Therapeutics
ABEO
$149M
| $208K | ﹤0.01% |
39,600
+10,700
| +37% | +$66.4K |
2023 Q4
11 quarters
|
|
4595
Kinsale Capital Group
KNSL
$8.91B
| $208K | ﹤0.01% |
644
+520
| +419% | +$187K |
2026 Q1
2 quarters
|
|
4596
Ecopetrol
EC
$31.7B
| $207K | ﹤0.01% |
12,578
-5,080
| -29% | -$84.8K |
2026 Q1
2 quarters
|
|
4597
PUT
JBG SMITH
JBGS
$725M
| $207K | ﹤0.01% |
+20,600
| New | +$260K |
2026 Q3
0 quarters
|
|
4598
PUT
Louisiana-Pacific
LPX
$5.3B
| $207K | ﹤0.01% |
3,200
+1,800
| +129% | +$129K |
2026 Q2
1 quarter
|
|
4599
CALL
First Citizens BancShares
FCNCA
$25.7B
| $206K | ﹤0.01% |
100
-1,000
| -91% | -$2.15M |
2026 Q1
2 quarters
|
|
4600
CALL
AGCO
AGCO
$7.72B
| $206K | ﹤0.01% |
1,800
-1,800
| -50% | -$205K |
2016 Q2
41 quarters
|
|
Similar funds
Simplex Trading's Q3 2026 Portfolio in Review
As of Q3 2026, Simplex Trading held 10,644 positions worth $184B, up 7.8% from $171B the previous quarter. Its ten largest holdings account for 51% of the portfolio.
Simplex Trading's Q3 2026 filing shows 1,493 new, 3,697 increased, 3,633 reduced and 1,534 closed positions. Its largest new stake was iShares iBoxx $ High Yield Corporate Bond ETF: 1,017,542 shares worth $78.6M. The largest sale was Alphabet (Google) Class A, an estimated $128M.
By sector, the portfolio is most concentrated in Miscellaneous at 99% of assets, up from 98% a quarter earlier, followed by Technology and Consumer Discretionary.
- Simplex Trading's largest Q3 2026 buy was iShares iBoxx $ High Yield Corporate Bond ETF: 1,017,542 shares worth $78.6M.
- Simplex Trading added most to iShares 20+ Year Treasury Bond ETF in Q3 2026, an estimated $92.6M increase.
- Simplex Trading's biggest Q3 2026 reduction was NVIDIA, cutting an estimated $97.8M.
- Simplex Trading fully exited Alphabet (Google) Class A in Q3 2026, selling an estimated $128M.
- Simplex Trading's ten largest holdings make up 51% of its $184B portfolio in Q3 2026.
- Simplex Trading opened 1,493 new positions and closed 1,534 in Q3 2026.
- Simplex Trading's portfolio value rose 7.8% quarter-over-quarter to $184B.
Based on Simplex Trading's 13F filing for Q3 2026, filed 4 Nov 2026.