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 | |
|---|---|---|---|---|---|---|
1251
CALL
Xtrackers MSCI Emerging Markets Hedged Equity ETF
DBEM
$106M
| $5.7M | ﹤0.01% |
219,300
-87,600
| -29% | -$1.98M |
|
1252
PUT
Trane Technologies
TT
$107B
| $5.7M | ﹤0.01% |
28,100
+11,400
| +68% | +$2.28M |
|
1253
PUT
Ralph Lauren
RL
$22.4B
| $5.7M | ﹤0.01% |
49,100
-10,600
| -18% | -$1.28M |
|
1254
CALL
Equifax
EFX
$20.2B
| $5.7M | ﹤0.01% |
31,100
+17,800
| +134% | +$3.63M |
|
1255
CALL
FIVE9
FIVN
$1.77B
| $5.68M | ﹤0.01% |
88,400
+23,700
| +37% | +$1.77M |
|
1256
CALL
Sigma Lithium
SGML
$1.1B
| $5.65M | ﹤0.01% |
174,200
+148,900
| +589% | +$5.33M |
|
1257
PUT
JB Hunt Transport Services
JBHT
$27.3B
| $5.64M | ﹤0.01% |
29,900
-19,600
| -40% | -$3.76M |
|
1258
CALL
monday.com
MNDY
$3.22B
| $5.64M | ﹤0.01% |
35,400
-34,800
| -50% | -$5.84M |
|
1259
PUT
Fidelity National Information Services
FIS
$21.3B
| $5.63M | ﹤0.01% |
101,900
-67,900
| -40% | -$3.91M |
|
1260
PUT
Academy Sports + Outdoors
ASO
$2.93B
| $5.63M | ﹤0.01% |
119,000
-24,200
| -17% | -$1.3M |
|
1261
CALL
Viking Therapeutics
VKTX
$4.08B
| $5.62M | ﹤0.01% |
508,000
-101,500
| -17% | -$1.45M |
|
1262
Invesco CurrencyShares Japanese Yen Trust
FXY
$423M
| $5.61M | ﹤0.01% |
90,241
+31,183
| +53% | +$2.01M |
|
1263
PUT
Post Holdings
POST
$4.14B
| $5.58M | ﹤0.01% |
65,100
+9,600
| +17% | +$838K |
|
|
MRSH
1264
PUT
Marsh
MRSH
$85.1B
| $5.58M | ﹤0.01% |
29,300
+21,300
| +266% | +$4.08M |
|
1265
CALL
Helen of Troy
HELE
$652M
| $5.57M | ﹤0.01% |
47,800
+16,500
| +53% | +$2.05M |
|
1266
CALL
AES
AES
$10.6B
| $5.57M | ﹤0.01% |
366,300
+245,400
| +203% | +$4.67M |
|
1267
PUT
UiPath
PATH
$5.55B
| $5.57M | ﹤0.01% |
325,400
+17,400
| +6% | +$290K |
|
1268
CALL
Cooper Companies
COO
$13.7B
| $5.57M | ﹤0.01% |
70,000
+69,200
| +8,650% | +$6.38M |
|
1269
CALL
Monster Beverage
MNST
$91.5B
| $5.57M | ﹤0.01% |
105,100
-88,800
| -46% | -$5.05M |
|
1270
iShares MSCI EAFE ETF
EFA
$76.7B
| $5.55M | ﹤0.01% |
+80,528
| New | +$5.77M |
|
1271
CALL
NNN REIT
NNN
$9.33B
| $5.55M | ﹤0.01% |
157,000
+109,200
| +228% | +$4.38M |
|
1272
PUT
BWX Technologies
BWXT
$16.1B
| $5.54M | ﹤0.01% |
73,900
+70,500
| +2,074% | +$5.1M |
|
1273
CALL
TechnipFMC
FTI
$30.6B
| $5.54M | ﹤0.01% |
272,300
+83,400
| +44% | +$1.57M |
|
1274
CALL
East-West Bancorp
EWBC
$18B
| $5.53M | ﹤0.01% |
105,000
+51,400
| +96% | +$2.89M |
|
1275
PUT
Ameren
AEE
$31.4B
| $5.52M | ﹤0.01% |
73,800
+73,000
| +9,125% | +$5.95M |
|
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.