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 | |
|---|---|---|---|---|---|---|
1301
CALL
Tower Semiconductor
TSEM
$26.4B
| $5.33M | ﹤0.01% |
217,000
+207,900
| +2,285% | +$6.67M |
|
1302
PUT
MPLX
MPLX
$59.5B
| $5.32M | ﹤0.01% |
149,700
+10,800
| +8% | +$377K |
|
1303
PUT
C.H. Robinson
CHRW
$22B
| $5.32M | ﹤0.01% |
61,800
+39,500
| +177% | +$3.69M |
|
1304
Snap
SNAP
$7.32B
| $5.32M | ﹤0.01% |
596,803
-138,938
| -19% | -$1.45M |
|
1305
QuantumScape Corp
QS
$3B
| $5.31M | ﹤0.01% |
794,236
+458,120
| +136% | +$3.73M |
|
1306
CALL
Freshpet
FRPT
$2.83B
| $5.31M | ﹤0.01% |
80,600
-4,100
| -5% | -$294K |
|
1307
CALL
Ralph Lauren
RL
$22.2B
| $5.29M | ﹤0.01% |
45,600
+1,500
| +3% | +$182K |
|
1308
CALL
Idexx Laboratories
IDXX
$42.9B
| $5.29M | ﹤0.01% |
12,100
-1,200
| -9% | -$598K |
|
1309
CALL
BHP
BHP
$213B
| $5.29M | ﹤0.01% |
93,400
-81,300
| -47% | -$4.75M |
|
|
DISH
1310
PUT
DELISTED
DISH Network Corp.
DISH
| $5.28M | ﹤0.01% |
901,000
+37,000
| +4% | +$252K |
|
1311
Valero Energy
VLO
$89.8B
| $5.26M | ﹤0.01% |
+37,156
| New | +$4.87M |
|
1312
CALL
Penske Automotive Group
PAG
$14.3B
| $5.26M | ﹤0.01% |
31,500
+27,200
| +633% | +$4.55M |
|
|
BRSL
1313
CALL
Brightstar Lottery PLC
BRSL
$1.91B
| $5.26M | ﹤0.01% |
173,500
-26,400
| -13% | -$841K |
|
1314
PUT
Texas Roadhouse
TXRH
$12.7B
| $5.26M | ﹤0.01% |
54,700
+30,900
| +130% | +$3.29M |
|
1315
PUT
Sherwin-Williams
SHW
$78.3B
| $5.25M | ﹤0.01% |
20,600
-28,000
| -58% | -$7.5M |
|
1316
CALL
Dynatrace
DT
$12.1B
| $5.25M | ﹤0.01% |
112,400
-33,800
| -23% | -$1.66M |
|
1317
CALL
Axcelis
ACLS
$4.12B
| $5.25M | ﹤0.01% |
32,200
+18,800
| +140% | +$3.31M |
|
1318
CALL
Manchester United
MANU
$3.91B
| $5.24M | ﹤0.01% |
264,900
-15,300
| -5% | -$333K |
|
1319
CALL
Mattel
MAT
$4.17B
| $5.24M | ﹤0.01% |
237,900
+209,000
| +723% | +$4.46M |
|
1320
PUT
Corpay
CPAY
$24.2B
| $5.23M | ﹤0.01% |
20,500
-4,600
| -18% | -$1.2M |
|
1321
iShares Silver Trust
SLV
$28.1B
| $5.22M | ﹤0.01% |
+256,610
| New | +$5.55M |
|
1322
Colgate-Palmolive
CL
$72.6B
| $5.21M | ﹤0.01% |
73,208
-58,157
| -44% | -$4.35M |
|
1323
PUT
Archer Daniels Midland
ADM
$41.4B
| $5.2M | ﹤0.01% |
68,900
-40,400
| -37% | -$3.27M |
|
1324
CALL
Cintas
CTAS
$82.4B
| $5.19M | ﹤0.01% |
43,200
+6,800
| +19% | +$847K |
|
1325
CALL
BioMarin Pharmaceuticals
BMRN
$11.5B
| $5.18M | ﹤0.01% |
58,600
-36,300
| -38% | -$3.23M |
|
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.