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 | |
|---|---|---|---|---|---|---|
2401
Texas Roadhouse
TXRH
$12.7B
| $1.35M | ﹤0.01% |
14,029
-3,223
| -19% | -$343K |
|
2402
Agilon Health
AGL
$1.64B
| $1.35M | ﹤0.01% |
+3,036
| New | +$1.37M |
|
2403
Papa John's
PZZA
$999M
| $1.35M | ﹤0.01% |
19,747
+15,693
| +387% | +$1.21M |
|
2404
PUT
HDFC Bank
HDB
$119B
| $1.34M | ﹤0.01% |
45,600
+38,800
| +571% | +$1.26M |
|
2405
CALL
Algoma Steel
ASTL
$455M
| $1.34M | ﹤0.01% |
197,700
-70,100
| -26% | -$503K |
|
2406
PUT
Champion Homes
SKY
$4.48B
| $1.34M | ﹤0.01% |
21,100
+18,700
| +779% | +$1.26M |
|
2407
CALL
Western Midstream Partners
WES
$19.6B
| $1.34M | ﹤0.01% |
49,300
-700
| -1% | -$19K |
|
2408
CALL
Pinnacle West Capital
PNW
$12.9B
| $1.34M | ﹤0.01% |
18,200
+4,900
| +37% | +$389K |
|
2409
PUT
TG Therapeutics
TGTX
$8.58B
| $1.34M | ﹤0.01% |
160,400
+59,200
| +58% | +$825K |
|
2410
PUT
dLocal
DLO
$4.26B
| $1.34M | ﹤0.01% |
69,700
+900
| +1% | +$15.3K |
|
2411
CALL
Eastman Chemical
EMN
$7.8B
| $1.33M | ﹤0.01% |
17,400
+13,800
| +383% | +$1.15M |
|
2412
PUT
MicroSectors FANG+ ETNs due Jan 8 2038
FNGS
$542M
| $1.33M | ﹤0.01% |
41,700
-106,500
| -72% | -$3.56M |
|
|
JMIA
2413
PUT
Jumia Technologies
JMIA
$726M
| $1.33M | ﹤0.01% |
504,700
+10,500
| +2% | +$36.3K |
|
2414
PUT
Opendoor
OPEN
$3.69B
| $1.33M | ﹤0.01% |
521,627
+297,187
| +132% | +$1.07M |
|
2415
CALL
Xponential Fitness
XPOF
$265M
| $1.33M | ﹤0.01% |
85,900
-33,800
| -28% | -$663K |
|
2416
PUT
Bumble
BMBL
$367M
| $1.33M | ﹤0.01% |
89,100
-13,800
| -13% | -$233K |
|
2417
PUT
Iovance Biotherapeutics
IOVA
$2.23B
| $1.33M | ﹤0.01% |
292,000
+239,500
| +456% | +$1.56M |
|
|
WRK
2418
DELISTED
WestRock Company
WRK
| $1.33M | ﹤0.01% |
37,092
-1,321
| -3% | -$43.3K |
|
2419
Bilibili
BILI
$7.18B
| $1.33M | ﹤0.01% |
+96,312
| New | +$1.49M |
|
|
MAXN
2420
CALL
DELISTED
Maxeon Solar Technologies
MAXN
| $1.32M | ﹤0.01% |
1,144
+406
| +55% | +$771K |
|
2421
CALL
Owens Corning
OC
$11.5B
| $1.32M | ﹤0.01% |
9,700
+4,000
| +70% | +$550K |
|
2422
PUT
Arthur J. Gallagher & Co
AJG
$63.7B
| $1.32M | ﹤0.01% |
5,800
+4,200
| +263% | +$940K |
|
2423
CALL
Huntington Bancshares
HBAN
$35.1B
| $1.32M | ﹤0.01% |
127,100
+3,800
| +3% | +$42.6K |
|
2424
Applied Digital
APLD
$7.77B
| $1.32M | ﹤0.01% |
+211,440
| New | +$1.48M |
|
|
RWT
2425
CALL
Redwood Trust
RWT
$616M
| $1.32M | ﹤0.01% |
185,000
-19,300
| -9% | -$142K |
|
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.