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 | |
|---|---|---|---|---|---|---|
|
PRO
6351
PUT
DELISTED
PROS Holdings
PRO
| $27K | ﹤0.01% |
+800
| New | +$27.6K |
|
6352
PUT
Parsons
PSN
$4.6B
| $27K | ﹤0.01% |
+500
| New | +$26.5K |
|
|
PVBC
6353
CALL
DELISTED
Provident Bancorp
PVBC
| $27K | ﹤0.01% |
2,800
-100
| -3% | -$949 |
|
|
RPC
6354
Ridgepost Capital
RPC
$937M
| $27K | ﹤0.01% |
2,353
+214
| +10% | +$2.5K |
|
6355
PUT
RLI Corp
RLI
$5.6B
| $27K | ﹤0.01% |
400
| – | – |
|
6356
PUT
RxSight
RXST
$246M
| $27K | ﹤0.01% |
+1,000
| New | +$29.8K |
|
6357
Sana Biotechnology
SANA
$893M
| $27K | ﹤0.01% |
+7,167
| New | +$38.5K |
|
6358
Sweetgreen
SG
$784M
| $27K | ﹤0.01% |
+2,377
| New | +$33.1K |
|
|
SOHU
6359
CALL
Sohu.com
SOHU
$357M
| $27K | ﹤0.01% |
2,900
-13,700
| -83% | -$148K |
|
|
TIXT
6360
DELISTED
TELUS International
TIXT
| $27K | ﹤0.01% |
3,623
+3,467
| +2,222% | +$33.1K |
|
6361
PUT
TPG
TPG
$6.86B
| $27K | ﹤0.01% |
900
+600
| +200% | +$17.5K |
|
|
TRUE
6362
PUT
DELISTED
TrueCar
TRUE
| $27K | ﹤0.01% |
13,500
-158,900
| -92% | -$365K |
|
6363
Tyra Biosciences
TYRA
$1.9B
| $27K | ﹤0.01% |
2,009
+1,335
| +198% | +$19.8K |
|
6364
CALL
Vera Therapeutics
VERA
$2.32B
| $27K | ﹤0.01% |
2,000
-1,400
| -41% | -$24K |
|
6365
CALL
VirTra
VTSI
$35.1M
| $27K | ﹤0.01% |
5,000
-10,200
| -67% | -$69.3K |
|
|
PETQ
6366
PUT
DELISTED
PetIQ, Inc. Class A Common Stock
PETQ
| $27K | ﹤0.01% |
1,400
-8,600
| -86% | -$154K |
|
|
MODN
6367
DELISTED
MODEL N, INC.
MODN
| $27K | ﹤0.01% |
1,145
+884
| +339% | +$26.2K |
|
|
NETI
6368
PUT
DELISTED
Eneti Inc.
NETI
| $27K | ﹤0.01% |
2,700
-13,300
| -83% | -$153K |
|
|
RBT
6369
PUT
DELISTED
Rubicon Technologies, Inc.
RBT
| $27K | ﹤0.01% |
13,100
+11,700
| +836% | +$54.9K |
|
6370
ABM Industries
ABM
$2.79B
| $26K | ﹤0.01% |
651
-586
| -47% | -$25.4K |
|
6371
CALL
ADMA Biologics
ADMA
$1.95B
| $26K | ﹤0.01% |
7,500
-114,200
| -94% | -$440K |
|
6372
CALL
Alpha and Omega Semiconductor
AOSL
$958M
| $26K | ﹤0.01% |
900
+600
| +200% | +$18.7K |
|
6373
CALL
American Resources Corp
AREC
$187M
| $26K | ﹤0.01% |
16,100
-1,500
| -9% | -$2.4K |
|
6374
PUT
BARK
BARK
$81.9M
| $26K | ﹤0.01% |
1,085
-20
| -2% | -$556 |
|
|
CLSD
6375
CALL
DELISTED
Clearside Biomedical
CLSD
| $26K | ﹤0.01% |
2,000
-60
| -3% | -$909 |
|
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.