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 | |
|---|---|---|---|---|---|---|
5576
CALL
ESS Tech
GWH
$22M
| $63K | ﹤0.01% |
2,260
-320
| -12% | -$7.78K |
|
5577
CALL
Kopin
KOPN
$652M
| $63K | ﹤0.01% |
52,000
-37,500
| -42% | -$60.8K |
|
5578
CALL
Mine Safety
MSA
$7.35B
| $63K | ﹤0.01% |
400
+200
| +100% | +$34.4K |
|
|
PMT
5579
PUT
PennyMac Mortgage Investment
PMT
$822M
| $63K | ﹤0.01% |
5,100
-11,000
| -68% | -$144K |
|
|
QIPT
5580
DELISTED
Quipt Home Medical
QIPT
| $63K | ﹤0.01% |
12,454
+36
| +0.3% | +$193 |
|
5581
VanEck Semiconductor ETF
SMH
$65.2B
| $63K | ﹤0.01% |
+436
| New | +$66K |
|
|
UBX
5582
CALL
DELISTED
Unity Biotechnology
UBX
| $63K | ﹤0.01% |
26,400
-11,300
| -30% | -$29.9K |
|
|
JBTM
5583
CALL
JBT Marel
JBTM
$7.21B
| $63K | ﹤0.01% |
600
+100
| +20% | +$11.2K |
|
|
PRFT
5584
CALL
DELISTED
Perficient Inc
PRFT
| $63K | ﹤0.01% |
1,100
+1,000
| +1,000% | +$68.5K |
|
|
MRNS
5585
DELISTED
Marinus Pharmaceuticals, Inc
MRNS
| $63K | ﹤0.01% |
7,895
-83,840
| -91% | -$697K |
|
|
CCV
5586
CALL
DELISTED
Churchill Capital Corp V
CCV
| $63K | ﹤0.01% |
+6,100
| New | +$62.9K |
|
|
EGLE
5587
CALL
DELISTED
Eagle Bulk Shipping Inc.
EGLE
| $63K | ﹤0.01% |
1,500
+100
| +7% | +$4.38K |
|
|
BBT
5588
CALL
Beacon Financial Corp
BBT
$2.66B
| $62K | ﹤0.01% |
3,100
+100
| +3% | +$2.14K |
|
5589
CALL
BioXcel Therapeutics
BTAI
$24.9M
| $62K | ﹤0.01% |
1,556
-10,019
| -87% | -$1.01M |
|
|
BBBY
5590
Bed Bath & Beyond
BBBY
$481M
| $62K | ﹤0.01% |
4,369
-218,779
| -98% | -$5.36M |
|
5591
Driven Brands
DRVN
$2.35B
| $62K | ﹤0.01% |
4,994
+1,784
| +56% | +$32.6K |
|
|
EXK
5592
PUT
Endeavour Silver
EXK
$2.23B
| $62K | ﹤0.01% |
25,600
-300
| -1% | -$885 |
|
5593
CALL
Cedar Fair
FUN
$1.77B
| $62K | ﹤0.01% |
1,700
-100
| -6% | -$3.9K |
|
5594
PUT
Goldman Sachs BDC
GSBD
$969M
| $62K | ﹤0.01% |
4,300
+900
| +26% | +$13K |
|
5595
Harmony Biosciences
HRMY
$2.04B
| $62K | ﹤0.01% |
1,914
+1,736
| +975% | +$60.3K |
|
5596
CALL
Installed Building Products
IBP
$6.01B
| $62K | ﹤0.01% |
500
| – | – |
|
5597
Ichor Holdings
ICHR
$2.62B
| $62K | ﹤0.01% |
2,010
+439
| +28% | +$15K |
|
5598
PUT
Intrepid Potash
IPI
$456M
| $62K | ﹤0.01% |
2,500
-16,400
| -87% | -$420K |
|
5599
Lincoln National
LNC
$8.73B
| $62K | ﹤0.01% |
2,542
-20,313
| -89% | -$531K |
|
5600
PUT
Mitek Systems
MITK
$754M
| $62K | ﹤0.01% |
5,800
+5,400
| +1,350% | +$60.4K |
|
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.