Simplex Trading Portfolio holdings
Simplex Trading, founded in 2004 and headquartered in Chicago, Illinois, is a technology-driven proprietary trading firm specializing in market-making and liquidity provision, primarily in U.S. equity options and futures options. Leveraging advanced proprietary software and data-driven analysis, the firm optimizes trading strategies and develops innovative solutions to capitalize on financial market opportunities, maintaining a competitive edge through automation and a collaborative team of technologists and traders. With a workforce exceeding 300 and led by CEO Erik Swanson since 2014, Simplex operates with a low-ego, high-intelligence culture, focusing on minimal bureaucracy and rapid execution, while also making strategic venture capital investments in fintech startups. Recognized as a top workplace in Chicago by Built In’s 2025 awards, Simplex continues to evolve, blending cutting-edge technology with a commitment to market efficiency and growth.
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$113M |
| 2 |
SPDR Gold Trust
GLD
|
+$68.6M |
| 3 |
NVIDIA
NVDA
|
+$63.4M |
| 4 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$55.2M |
| 5 |
Apple
AAPL
|
+$54.9M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Netflix
NFLX
|
+$27.1M |
| 2 |
Qualcomm
QCOM
|
+$24.6M |
| 3 |
Walt Disney
DIS
|
+$21.2M |
| 4 |
Advanced Micro Devices
AMD
|
+$18.2M |
| 5 |
Snowflake
SNOW
|
+$16.1M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.44% |
| 2 | Consumer Discretionary | 0.32% |
| 3 | Healthcare | 0.22% |
| 4 | Financials | 0.17% |
| 5 | Communication Services | 0.15% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
|
SHCO
6176
PUT
DELISTED
Soho House & Co
SHCO
| $33K | ﹤0.01% |
4,800
+3,900
| +433% | +$25K |
|
6177
PUT
SkinHealth Systems
SKIN
$88.8M
| $33K | ﹤0.01% |
5,500
-1,800
| -25% | -$12.6K |
|
6178
PUT
Stem
STEM
$48.4M
| $33K | ﹤0.01% |
390
-6,510
| -94% | -$743K |
|
6179
CALL
Alaunos Therapeutics
TCRT
$4.59M
| $33K | ﹤0.01% |
1,715
+760
| +80% | +$32.7K |
|
|
VERV
6180
CALL
DELISTED
Verve Therapeutics
VERV
| $33K | ﹤0.01% |
2,500
+2,000
| +400% | +$32.2K |
|
|
DM
6181
CALL
DELISTED
Desktop Metal, Inc.
DM
| $33K | ﹤0.01% |
2,280
-2,340
| -51% | -$38.9K |
|
6182
CALL
Adecoagro
AGRO
$1.44B
| $32K | ﹤0.01% |
2,800
-6,100
| -69% | -$65.9K |
|
6183
PUT
Braze
BRZE
$2.81B
| $32K | ﹤0.01% |
700
-13,800
| -95% | -$606K |
|
6184
CALL
Crescent Capital BDC
CCAP
$403M
| $32K | ﹤0.01% |
1,900
+1,500
| +375% | +$24.8K |
|
6185
PUT
CION Investment
CION
$297M
| $32K | ﹤0.01% |
3,100
+1,300
| +72% | +$14.1K |
|
6186
CALL
ClearPoint Neuro
CLPT
$448M
| $32K | ﹤0.01% |
6,500
-800
| -11% | -$4.76K |
|
6187
PUT
Dana Inc
DAN
$2.9B
| $32K | ﹤0.01% |
2,200
+1,800
| +450% | +$30K |
|
6188
PUT
Dimensional US Core Equity Market ETF
DFAU
$12.4B
| $32K | ﹤0.01% |
+1,300
| New | +$40.5K |
|
6189
First Financial Bankshares
FFIN
$5.04B
| $32K | ﹤0.01% |
1,285
+758
| +144% | +$22K |
|
|
FFWM
6190
CALL
DELISTED
First Foundation Inc
FFWM
| $32K | ﹤0.01% |
5,300
+2,600
| +96% | +$17.1K |
|
6191
Flux Power
FLUX
$11.2M
| $32K | ﹤0.01% |
9,520
+5,795
| +156% | +$26.5K |
|
6192
PUT
Gentex
GNTX
$4.97B
| $32K | ﹤0.01% |
1,000
| – | – |
|
6193
Gran Tierra Energy
GTE
$265M
| $32K | ﹤0.01% |
+4,700
| New | +$30.1K |
|
6194
PUT
InflaRx
IFRX
$250M
| $32K | ﹤0.01% |
10,900
-1,300
| -11% | -$4.95K |
|
6195
CALL
InfuSystem Holdings
INFU
$184M
| $32K | ﹤0.01% |
3,400
-2,200
| -39% | -$22.5K |
|
6196
Lantronix
LTRX
$240M
| $32K | ﹤0.01% |
7,343
+3,440
| +88% | +$15.1K |
|
6197
Merit Medical Systems
MMSI
$5.07B
| $32K | ﹤0.01% |
467
+336
| +256% | +$24.2K |
|
|
NGD
6198
PUT
DELISTED
New Gold Inc
NGD
| $32K | ﹤0.01% |
36,000
-900
| -2% | -$958 |
|
6199
Envista
NVST
$4.44B
| $32K | ﹤0.01% |
1,162
+402
| +53% | +$13K |
|
6200
PUT
Portland General Electric
POR
$5.71B
| $32K | ﹤0.01% |
+800
| New | +$36.3K |
|
Similar funds
Simplex Trading's Q3 2023 Portfolio in Review
As of Q3 2023, Simplex Trading held 10,417 positions worth $127B, up 4.5% from $122B the previous quarter. Its ten largest holdings account for 44% of the portfolio.
Simplex Trading deployed $11.9B of net new capital in Q3 2023, opening 1,399 new positions and adding to 3,690 existing holdings. Its largest new stake was Amazon: 841,102 shares worth $107M.
By sector, the portfolio is most concentrated in Technology at 0.44% of assets, up from 0.41% a quarter earlier, followed by Consumer Discretionary and Healthcare.
On the sell side, the largest reduction was Netflix, an estimated $27.1M trimmed.
- Simplex Trading's largest Q3 2023 buy was Amazon: 841,102 shares worth $107M.
- Simplex Trading added most to SPDR Gold Trust in Q3 2023, an estimated $68.6M increase.
- Simplex Trading's biggest Q3 2023 reduction was Netflix, cutting an estimated $27.1M.
- Simplex Trading fully exited Qualcomm in Q3 2023, selling an estimated $24.6M.
- Simplex Trading's ten largest holdings make up 44% of its $127B portfolio in Q3 2023.
- Simplex Trading opened 1,399 new positions and closed 1,719 in Q3 2023.
- Simplex Trading's portfolio value rose 4.5% quarter-over-quarter to $127B.
Based on Simplex Trading's 13F filing for Q3 2023, filed 1 Nov 2023.