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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 | |
|---|---|---|---|---|---|---|---|
2801
PUT
T1 Energy
TE
$638M
| $936K | ﹤0.01% |
242,500
-157,300
| -39% | -$810K |
2021 Q4
19 quarters
|
|
2802
PUT
Vanguard Total International Stock ETF
VXUS
$163B
| $935K | ﹤0.01% |
11,000
+2,100
| +24% | +$181K |
2021 Q1
22 quarters
|
|
2803
PUT
Cingulate
CING
$67.5M
| $934K | ﹤0.01% |
188,600
+119,300
| +172% | +$602K |
2026 Q2
1 quarter
|
|
2804
PUT
Pebblebrook Hotel Trust
PEB
$2.46B
| $932K | ﹤0.01% |
49,700
-300
| -0.6% | -$5.54K |
2026 Q2
1 quarter
|
|
2805
Nutrien
NTR
$34B
| $932K | ﹤0.01% |
13,265
-9,002
| -40% | -$641K |
2026 Q2
1 quarter
|
|
2806
CALL
10x Genomics
TXG
$8.16B
| $931K | ﹤0.01% |
10,300
+100
| +1% | +$5.85K |
2019 Q4
27 quarters
|
|
2807
PUT
WEC Energy
WEC
$38.6B
| $927K | ﹤0.01% |
9,200
+8,200
| +820% | +$893K |
2018 Q1
34 quarters
|
|
2808
UGI
UGI
$8.05B
| $927K | ﹤0.01% |
25,989
+6,186
| +31% | +$227K |
2025 Q4
3 quarters
|
|
2809
T-Rex 2X Long NVIDIA Daily Target ETF
NVDX
$234M
| $927K | ﹤0.01% |
44,844
+17,106
| +62% | +$322K |
2025 Q4
3 quarters
|
|
2810
Compass Diversified
CODI
$918M
| $927K | ﹤0.01% |
84,943
+39,142
| +85% | +$430K |
2026 Q1
2 quarters
|
|
2811
CALL
Xometry
XMTR
$7.06B
| $926K | ﹤0.01% |
9,000
-31,300
| -78% | -$2.9M |
2021 Q4
19 quarters
|
|
2812
ING
ING
$94.9B
| $925K | ﹤0.01% |
26,065
+23,813
| +1,057% | +$830K |
2026 Q1
2 quarters
|
|
2813
CALL
Core & Main
CNM
$8.48B
| $925K | ﹤0.01% |
22,300
+21,800
| +4,360% | +$960K |
2023 Q4
11 quarters
|
|
2814
PUT
American Exceptionalism Acquisition Corp
AEXA
$526M
| $925K | ﹤0.01% |
+83,000
| New | +$954K |
2026 Q3
0 quarters
|
|
2815
PUT
Ziff Davis
ZD
$1.7B
| $924K | ﹤0.01% |
16,300
-4,800
| -23% | -$263K |
2023 Q3
12 quarters
|
|
2816
PUT
Silicon Motion
SIMO
$6.23B
| $924K | ﹤0.01% |
3,300
-800
| -20% | -$212K |
2026 Q1
2 quarters
|
|
2817
CALL
Allegro MicroSystems
ALGM
$5.99B
| $923K | ﹤0.01% |
25,400
-16,800
| -40% | -$704K |
2021 Q1
22 quarters
|
|
2818
Rogers Corp
ROG
$2.33B
| $923K | ﹤0.01% |
6,034
-1,382
| -19% | -$183K |
2022 Q4
15 quarters
|
|
2819
CALL
Allegion
ALLE
$16.2B
| $923K | ﹤0.01% |
6,000
+5,700
| +1,900% | +$875K |
2026 Q2
1 quarter
|
|
2820
CALL
Vaalco Energy
EGY
$571M
| $923K | ﹤0.01% |
163,000
+50,800
| +45% | +$288K |
2019 Q4
27 quarters
|
|
2821
CALL
Aquestive Therapeutics
AQST
$450M
| $920K | ﹤0.01% |
198,800
-31,400
| -14% | -$140K |
2023 Q2
13 quarters
|
|
2822
PUT
The GEO Group
GEO
$4.31B
| $920K | ﹤0.01% |
30,200
+20,900
| +225% | +$647K |
2017 Q4
35 quarters
|
|
2823
Patterson-UTI
PTEN
$3.95B
| $919K | ﹤0.01% |
84,203
+77,104
| +1,086% | +$846K |
2026 Q2
1 quarter
|
|
2824
Dynex Capital
DX
$2.71B
| $919K | ﹤0.01% |
+82,533
| New | +$1.05M |
2026 Q3
0 quarters
|
|
2825
PUT
Targa Resources
TRGP
$62.6B
| $919K | ﹤0.01% |
3,400
-4,400
| -56% | -$1.23M |
2014 Q4
47 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.