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 | |
|---|---|---|---|---|---|---|
2051
CALL
Trex
TREX
$4.51B
| $2.05M | ﹤0.01% |
33,200
+13,600
| +69% | +$933K |
|
2052
Berkshire Hathaway Class B
BRK.B
$1.07T
| $2.04M | ﹤0.01% |
5,839
-27,254
| -82% | -$9.67M |
|
2053
First Majestic Silver
AG
$8.05B
| $2.04M | ﹤0.01% |
398,631
+61,873
| +18% | +$368K |
|
2054
PUT
Ameriprise Financial
AMP
$46.8B
| $2.04M | ﹤0.01% |
6,200
+5,100
| +464% | +$1.74M |
|
2055
CALL
Watsco Inc
WSO
$14.9B
| $2.04M | ﹤0.01% |
5,400
+4,000
| +286% | +$1.45M |
|
2056
PUT
RBC Bearings
RBC
$18.8B
| $2.04M | ﹤0.01% |
8,700
+2,400
| +38% | +$544K |
|
2057
Direxion Daily Small Cap Bull 3x ETF
TNA
$1.34B
| $2.03M | ﹤0.01% |
+70,643
| New | +$2.47M |
|
|
XIFR
2058
PUT
XPLR Infrastructure LP
XIFR
$1.18B
| $2.02M | ﹤0.01% |
68,200
+53,300
| +358% | +$2.7M |
|
2059
PUT
Credit Acceptance
CACC
$6B
| $2.02M | ﹤0.01% |
4,400
-100
| -2% | -$50.6K |
|
2060
Pacific Biosciences
PACB
$422M
| $2.02M | ﹤0.01% |
242,235
+71,792
| +42% | +$820K |
|
2061
CALL
Nexstar Media Group
NXST
$5.6B
| $2.02M | ﹤0.01% |
14,100
+12,000
| +571% | +$1.95M |
|
2062
PUT
Quanta Services
PWR
$93.9B
| $2.02M | ﹤0.01% |
10,800
-8,200
| -43% | -$1.64M |
|
2063
PUT
American Eagle Outfitters
AEO
$2.85B
| $2.01M | ﹤0.01% |
121,200
-30,500
| -20% | -$451K |
|
2064
CALL
Aurinia Pharmaceuticals
AUPH
$1.97B
| $2.01M | ﹤0.01% |
259,200
+34,200
| +15% | +$334K |
|
2065
CALL
Avantor
AVTR
$7.81B
| $2.01M | ﹤0.01% |
95,400
-60,000
| -39% | -$1.28M |
|
2066
PUT
Molson Coors Class B
TAP
$7.68B
| $2.01M | ﹤0.01% |
31,600
-72,200
| -70% | -$4.7M |
|
|
VRNT
2067
PUT
DELISTED
Verint Systems
VRNT
| $2.01M | ﹤0.01% |
87,400
+84,700
| +3,137% | +$2.73M |
|
2068
CALL
Alcon
ALC
$33.1B
| $2M | ﹤0.01% |
26,000
+7,700
| +42% | +$633K |
|
2069
Sigma Lithium
SGML
$1.08B
| $2M | ﹤0.01% |
61,714
+48,099
| +353% | +$1.72M |
|
2070
CALL
FT Vest Gold Strategy Target Income ETF
IGLD
$507M
| $2M | ﹤0.01% |
26,900
-19,400
| -42% | -$367K |
|
|
FLG
2071
PUT
Flagstar Bank National Association
FLG
$5.77B
| $2M | ﹤0.01% |
58,700
-23,333
| -28% | -$844K |
|
|
CBAY
2072
PUT
DELISTED
Cymabay Therapeutics
CBAY
| $2M | ﹤0.01% |
133,900
+133,800
| +133,800% | +$1.77M |
|
2073
PUT
Perion Network
PERI
$367M
| $1.99M | ﹤0.01% |
65,100
-13,800
| -17% | -$463K |
|
2074
CALL
American Superconductor
AMSC
$1.48B
| $1.99M | ﹤0.01% |
263,900
+225,200
| +582% | +$1.87M |
|
2075
CALL
Stem
STEM
$49.2M
| $1.99M | ﹤0.01% |
23,455
+4,780
| +26% | +$546K |
|
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.