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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 | |
|---|---|---|---|---|---|---|---|
3776
CALL
Dakota Gold
DC
$710M
| $421K | ﹤0.01% |
69,100
+65,000
| +1,585% | +$358K |
2025 Q4
3 quarters
|
|
3777
PUT
Richtech Robotics
RR
$167M
| $421K | ﹤0.01% |
266,300
+6,700
| +3% | +$11.3K |
2025 Q3
4 quarters
|
|
3778
Dolby
DLB
$5.86B
| $421K | ﹤0.01% |
+7,158
| New | +$412K |
2026 Q3
0 quarters
|
|
|
AWTM
3779
CALL
DELISTED
AWTM Ultra-Short Duration Enhanced Income ETF
AWTM
| $420K | ﹤0.01% |
15,000
+2,300
| +18% | +$64.4K |
2024 Q4
7 quarters
|
|
3780
PUT
Yalla Group
YALA
$831M
| $419K | ﹤0.01% |
78,100
+71,300
| +1,049% | +$389K |
2021 Q1
22 quarters
|
|
3781
PUT
Agios Pharmaceuticals
AGIO
$1.86B
| $419K | ﹤0.01% |
12,600
+2,400
| +24% | +$84K |
2025 Q2
5 quarters
|
|
3782
Lennar Class A
LEN
$19.9B
| $419K | ﹤0.01% |
5,134
-6,217
| -55% | -$522K |
2026 Q1
2 quarters
|
|
3783
Designer Brands
DBI
$325M
| $419K | ﹤0.01% |
69,227
-15,406
| -18% | -$90.6K |
2024 Q4
7 quarters
|
|
3784
Altimmune
ALT
$313M
| $419K | ﹤0.01% |
+146,416
| New | +$449K |
2026 Q3
0 quarters
|
|
3785
PUT
Sixth Street Specialty
TSLX
$1.68B
| $418K | ﹤0.01% |
23,200
+17,500
| +307% | +$315K |
2026 Q1
2 quarters
|
|
3786
CALL
TOYO Co
TOYO
$188M
| $418K | ﹤0.01% |
96,100
-46,500
| -33% | -$234K |
2026 Q2
1 quarter
|
|
3787
PUT
Douglas Emmett
DEI
$1.65B
| $418K | ﹤0.01% |
43,600
+23,800
| +120% | +$273K |
2022 Q2
17 quarters
|
|
3788
CALL
Regency Centers
REG
$13.9B
| $417K | ﹤0.01% |
5,800
+3,300
| +132% | +$255K |
2025 Q3
4 quarters
|
|
3789
CALL
Empery Digital
EMPD
$58.7M
| $416K | ﹤0.01% |
138,300
+89,700
| +185% | +$283K |
2026 Q2
1 quarter
|
|
3790
CALL
US Foods
USFD
$23.1B
| $415K | ﹤0.01% |
4,500
+1,800
| +67% | +$182K |
2017 Q4
35 quarters
|
|
3791
Flagstar Bank National Association
FLG
$4.16B
| $414K | ﹤0.01% |
35,511
-84,303
| -70% | -$1.16M |
2026 Q1
2 quarters
|
|
3792
Tema Space Innovators ETF
NASA
$4.31B
| $414K | ﹤0.01% |
17,280
-168,330
| -91% | -$4.09M |
2026 Q2
1 quarter
|
|
3793
PUT
Dyne Therapeutics
DYN
$3.19B
| $414K | ﹤0.01% |
25,700
+19,200
| +295% | +$441K |
2025 Q2
5 quarters
|
|
3794
BWX Technologies
BWXT
$11.1B
| $414K | ﹤0.01% |
3,022
+2,951
| +4,156% | +$482K |
2026 Q2
1 quarter
|
|
3795
FIGS
FIGS
$3.64B
| $414K | ﹤0.01% |
+29,840
| New | +$373K |
2026 Q3
0 quarters
|
|
3796
PUT
Patterson-UTI
PTEN
$4.07B
| $411K | ﹤0.01% |
37,600
-5,100
| -12% | -$56K |
2018 Q1
34 quarters
|
|
3797
PUT
Geron
GERN
$617M
| $410K | ﹤0.01% |
333,700
-3,000
| -0.9% | -$4.3K |
2021 Q2
21 quarters
|
|
3798
Chemours
CC
$1.98B
| $410K | ﹤0.01% |
30,244
+27,450
| +982% | +$442K |
2026 Q2
1 quarter
|
|
3799
Acadian Asset Management
AAMI
$3.27B
| $410K | ﹤0.01% |
4,472
+2,340
| +110% | +$206K |
2026 Q2
1 quarter
|
|
3800
PUT
Absci
ABSI
$1.46B
| $409K | ﹤0.01% |
38,000
-11,000
| -22% | -$101K |
2024 Q1
10 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.