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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 | |
|---|---|---|---|---|---|---|---|
4176
PUT
Ameren
AEE
$31.7B
| $298K | ﹤0.01% |
+3,000
| New | +$324K |
2026 Q3
0 quarters
|
|
4177
PUT
PTC Therapeutics
PTCT
$5.25B
| $298K | ﹤0.01% |
4,600
+1,200
| +35% | +$87.4K |
2024 Q3
8 quarters
|
|
4178
CALL
Ventas
VTR
$47B
| $298K | ﹤0.01% |
3,500
+1,000
| +40% | +$91.7K |
2014 Q4
47 quarters
|
|
4179
iShares Select Dividend ETF
DVY
$23.8B
| $297K | ﹤0.01% |
+1,956
| New | +$315K |
2026 Q3
0 quarters
|
|
4180
Alta Equipment Group
ALTG
$174M
| $297K | ﹤0.01% |
48,873
+10,253
| +27% | +$65.5K |
2025 Q2
5 quarters
|
|
4181
CALL
Immunome
IMNM
$2.2B
| $297K | ﹤0.01% |
13,800
-11,300
| -45% | -$280K |
2023 Q2
13 quarters
|
|
4182
Advanced Drainage Systems
WMS
$9.26B
| $297K | ﹤0.01% |
2,340
-939
| -29% | -$131K |
2026 Q2
1 quarter
|
|
4183
PUT
Kanzhun
BZ
$5.7B
| $296K | ﹤0.01% |
20,000
+2,800
| +16% | +$43.7K |
2021 Q4
19 quarters
|
|
4184
PUT
Sidus Space
SIDU
$94.3M
| $295K | ﹤0.01% |
163,200
-44,500
| -21% | -$95K |
2026 Q1
2 quarters
|
|
4185
PUT
Rezolute
RZLT
$372M
| $295K | ﹤0.01% |
71,300
+2,400
| +3% | +$11K |
2024 Q4
7 quarters
|
|
4186
CALL
Gemini Space Station
GEMI
$335M
| $295K | ﹤0.01% |
57,200
-28,600
| -33% | -$128K |
2025 Q3
4 quarters
|
|
4187
PUT
Strategic Education
STRA
$1.19B
| $295K | ﹤0.01% |
3,800
+300
| +9% | +$24.3K |
2026 Q2
1 quarter
|
|
4188
CALL
MarketAxess Holdings
MKTX
$5.82B
| $295K | ﹤0.01% |
1,800
-2,800
| -61% | -$415K |
2019 Q1
30 quarters
|
|
4189
CALL
Chord Energy
CHRD
$7.92B
| $295K | ﹤0.01% |
2,200
-1,000
| -31% | -$137K |
2021 Q1
22 quarters
|
|
4190
CALL
Allison Transmission
ALSN
$10.3B
| $294K | ﹤0.01% |
2,600
+2,300
| +767% | +$278K |
2026 Q1
2 quarters
|
|
4191
CALL
Mid-America Apartment Communities
MAA
$13.7B
| $294K | ﹤0.01% |
2,500
-3,900
| -61% | -$508K |
2018 Q2
33 quarters
|
|
4192
Tradr 2X Short IREN Daily ETF
IREZ
$21M
| $294K | ﹤0.01% |
+30,011
| New | +$485K |
2026 Q3
0 quarters
|
|
4193
PUT
Coursera
COUR
$897M
| $294K | ﹤0.01% |
59,200
-115,500
| -66% | -$649K |
2021 Q2
21 quarters
|
|
4194
CALL
Cemex
CX
$15.1B
| $293K | ﹤0.01% |
30,800
-33,200
| -52% | -$374K |
2021 Q1
22 quarters
|
|
4195
2x Long VIX Futures ETF
UVIX
$149M
| $293K | ﹤0.01% |
+7,944
| New | +$384K |
2026 Q3
0 quarters
|
|
4196
Plexus
PLXS
$5.51B
| $293K | ﹤0.01% |
1,122
+662
| +144% | +$169K |
2025 Q4
3 quarters
|
|
4197
PUT
Contango Silver & Gold Inc
CTGO
$398M
| $293K | ﹤0.01% |
18,300
-75,500
| -80% | -$1.37M |
2025 Q3
4 quarters
|
|
4198
PUT
Option Care Health
OPCH
$4.74B
| $292K | ﹤0.01% |
13,000
+12,200
| +1,525% | +$281K |
2023 Q2
13 quarters
|
|
4199
PUT
DELISTED
Arcosa
ACA
| $292K | ﹤0.01% |
2,000
+400
| +25% | +$58.1K |
2024 Q1
10 quarters
|
|
4200
PUT
Coca-Cola Femsa
KOF
$25.4B
| $292K | ﹤0.01% |
2,700
+1,100
| +69% | +$120K |
2026 Q2
1 quarter
|
|
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.