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 | |
|---|---|---|---|---|---|---|
651
PUT
Dell
DELL
$286B
| $17.5M | 0.01% |
254,700
+77,400
| +44% | +$4.61M |
|
652
CALL
KLA
KLAC
$283B
| $17.5M | 0.01% |
381,000
+20,000
| +6% | +$959K |
|
653
Rivian
RIVN
$24.1B
| $17.5M | 0.01% |
719,240
+568,355
| +377% | +$13.3M |
|
654
PUT
Nucor
NUE
$54.9B
| $17.4M | 0.01% |
111,600
+7,100
| +7% | +$1.18M |
|
655
PUT
HCA Healthcare
HCA
$83B
| $17.4M | 0.01% |
70,800
+8,500
| +14% | +$2.33M |
|
656
PUT
Cheniere Energy
LNG
$57.1B
| $17.4M | 0.01% |
104,900
+21,000
| +25% | +$3.39M |
|
|
SPLK
657
DELISTED
Splunk Inc
SPLK
| $17.4M | 0.01% |
118,662
+67,124
| +130% | +$7.6M |
|
658
PUT
Warner Bros
WBD
$65.2B
| $17.3M | 0.01% |
1,594,900
-671,700
| -30% | -$8.38M |
|
659
PUT
SAP
SAP
$171B
| $17.3M | 0.01% |
133,700
+2,200
| +2% | +$299K |
|
660
CALL
Plug Power
PLUG
$3.07B
| $17.3M | 0.01% |
2,271,000
+470,400
| +26% | +$4.6M |
|
661
CALL
C.H. Robinson
CHRW
$24.4B
| $17.1M | 0.01% |
198,800
-32,300
| -14% | -$3.02M |
|
662
CALL
Alpha Metallurgical Resources
AMR
$1.82B
| $17.1M | 0.01% |
65,900
+31,000
| +89% | +$6.06M |
|
663
CALL
Toyota
TM
$209B
| $17.1M | 0.01% |
95,200
+45,500
| +92% | +$7.77M |
|
664
CALL
Trip.com Group
TCOM
$27B
| $17.1M | 0.01% |
487,800
+263,900
| +118% | +$9.93M |
|
665
PUT
AMC Entertainment Holdings
AMC
$1.94B
| $17M | 0.01% |
2,132,200
+1,389,980
| +187% | +$41.2M |
|
666
PUT
BioNTech
BNTX
$23.3B
| $17M | 0.01% |
156,800
-13,400
| -8% | -$1.48M |
|
667
PUT
Agnico Eagle Mines
AEM
$72B
| $17M | 0.01% |
373,600
-99,500
| -21% | -$4.88M |
|
668
CALL
Prudential Financial
PRU
$40.7B
| $16.9M | 0.01% |
177,700
-45,000
| -20% | -$4.26M |
|
669
PUT
Digital Realty Trust
DLR
$66.7B
| $16.8M | 0.01% |
139,000
-157,500
| -53% | -$19.3M |
|
670
CALL
CarMax
KMX
$8.19B
| $16.8M | 0.01% |
237,400
-83,400
| -26% | -$6.83M |
|
671
PUT
Zillow
Z
$6.79B
| $16.7M | 0.01% |
362,900
-182,800
| -33% | -$9.4M |
|
672
CALL
Microchip Technology
MCHP
$43.9B
| $16.7M | 0.01% |
214,200
-10,500
| -5% | -$879K |
|
|
AYX
673
PUT
DELISTED
Alteryx Inc
AYX
| $16.7M | 0.01% |
443,200
+295,800
| +201% | +$10.6M |
|
674
CALL
Enovix
ENVX
$964M
| $16.7M | 0.01% |
1,518,743
+19,772
| +1% | +$283K |
|
675
CALL
iShares Gold Trust
IAU
$62.9B
| $16.6M | 0.01% |
474,900
-203,900
| -30% | -$7.44M |
|
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.