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 | |
|---|---|---|---|---|---|---|
|
DFTX
6026
PUT
Definium Therapeutics
DFTX
$5.78B
| $39K | ﹤0.01% |
12,500
-500
| -4% | -$2.06K |
|
6027
PUT
Microvast
MVST
$269M
| $39K | ﹤0.01% |
21,000
+3,500
| +20% | +$7.49K |
|
6028
CALL
OGE Energy
OGE
$9.78B
| $39K | ﹤0.01% |
1,200
-13,600
| -92% | -$476K |
|
6029
PUT
Paysign
PAYS
$501M
| $39K | ﹤0.01% |
20,000
+18,700
| +1,438% | +$38.6K |
|
6030
CALL
Praxis Precision Medicines
PRAX
$8.58B
| $39K | ﹤0.01% |
1,533
+580
| +61% | +$11K |
|
6031
CALL
Protolabs
PRLB
$1.79B
| $39K | ﹤0.01% |
1,500
-7,200
| -83% | -$217K |
|
6032
VanEck Rare Earth/Strategic Metals ETF
REMX
$1.95B
| $39K | ﹤0.01% |
+594
| New | +$45.2K |
|
6033
Sturm, Ruger & Co
RGR
$594M
| $39K | ﹤0.01% |
766
-41
| -5% | -$2.15K |
|
6034
PUT
Rogers Corp
ROG
$2.21B
| $39K | ﹤0.01% |
300
-1,700
| -85% | -$254K |
|
6035
PUT
Verrica Pharmaceuticals
VRCA
$89.7M
| $39K | ﹤0.01% |
1,010
+350
| +53% | +$17.8K |
|
6036
Alto Ingredients
ALTO
$369M
| $38K | ﹤0.01% |
8,640
-92,670
| -91% | -$358K |
|
|
GOLD
6037
CALL
Gold.com Inc
GOLD
$1.2B
| $38K | ﹤0.01% |
1,300
-4,000
| -75% | -$144K |
|
|
AVDX
6038
PUT
DELISTED
AvidXchange
AVDX
| $38K | ﹤0.01% |
4,100
+3,700
| +925% | +$38.8K |
|
|
BELFB
6039
CALL
Bel Fuse Inc Class B
BELFB
$3.87B
| $38K | ﹤0.01% |
800
-200
| -20% | -$10.3K |
|
6040
PUT
Vanguard Total International Bond ETF
BNDX
$81.9B
| $38K | ﹤0.01% |
+800
| New | +$38.7K |
|
6041
CALL
CEVA Inc
CEVA
$910M
| $38K | ﹤0.01% |
2,000
-900
| -31% | -$20.9K |
|
|
DEA
6042
PUT
Easterly Government Properties
DEA
$1.13B
| $38K | ﹤0.01% |
1,360
-5,000
| -79% | -$171K |
|
6043
PUT
Equity Lifestyle Properties
ELS
$12.6B
| $38K | ﹤0.01% |
600
+400
| +200% | +$27K |
|
6044
CALL
Evolution Petroleum
EPM
$132M
| $38K | ﹤0.01% |
5,700
-32,900
| -85% | -$278K |
|
6045
PUT
Genius Sports
GENI
$1.85B
| $38K | ﹤0.01% |
7,300
-11,300
| -61% | -$74.8K |
|
6046
CALL
Integra LifeSciences
IART
$1.29B
| $38K | ﹤0.01% |
+1,000
| New | +$42.1K |
|
6047
PUT
ICL Group
ICL
$6.53B
| $38K | ﹤0.01% |
6,900
-8,400
| -55% | -$50.7K |
|
6048
CALL
IGC Pharma
IGC
$26M
| $38K | ﹤0.01% |
107,900
-1,800
| -2% | -$644 |
|
6049
iShares Global Tech ETF
IXN
$8.32B
| $38K | ﹤0.01% |
666
+660
| +11,000% | +$40.1K |
|
6050
CALL
NexGen Energy
NXE
$6.06B
| $38K | ﹤0.01% |
6,400
-38,100
| -86% | -$197K |
|
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.