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 |
NVIDIA
NVDA
|
+$93M |
| 2 |
Citigroup
C
|
+$74.8M |
| 3 |
Pinduoduo
PDD
|
+$50.7M |
| 4 |
Intel
INTC
|
+$47.1M |
| 5 |
Broadcom
AVGO
|
+$46.2M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
State Street Energy Select Sector SPDR ETF
XLE
|
+$94.5M |
| 2 |
Pfizer
PFE
|
+$66.4M |
| 3 |
Boeing
BA
|
+$61.6M |
| 4 |
PayPal
PYPL
|
+$42.2M |
| 5 |
GE Aerospace
GE
|
+$42M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.53% |
| 2 | Consumer Discretionary | 0.29% |
| 3 | Healthcare | 0.21% |
| 4 | Financials | 0.2% |
| 5 | Materials | 0.12% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
1176
PUT
Logitech
LOGI
$15.2B
| $7.74M | ﹤0.01% |
79,900
-31,600
| -28% | -$2.84M |
|
1177
Mobileye
MBLY
$7.06B
| $7.74M | ﹤0.01% |
+275,448
| New | +$7.98M |
|
1178
CALL
GigaCloud Technology
GCT
$1.36B
| $7.71M | ﹤0.01% |
253,600
+126,500
| +100% | +$4.22M |
|
1179
PUT
Coherent
COHR
$56.6B
| $7.69M | ﹤0.01% |
106,100
-88,600
| -46% | -$5.33M |
|
1180
PUT
AerCap
AER
$23.9B
| $7.68M | ﹤0.01% |
82,400
+12,400
| +18% | +$1.1M |
|
1181
Humana
HUM
$47B
| $7.66M | ﹤0.01% |
20,501
-7,861
| -28% | -$2.65M |
|
1182
CALL
Harley-Davidson
HOG
$2.74B
| $7.64M | ﹤0.01% |
227,800
-45,700
| -17% | -$1.66M |
|
1183
CALL
CSX Corp
CSX
$98.5B
| $7.63M | ﹤0.01% |
228,200
+15,500
| +7% | +$526K |
|
1184
PUT
Casey's General Stores
CASY
$31.7B
| $7.63M | ﹤0.01% |
20,000
+8,300
| +71% | +$2.77M |
|
|
LSXMA
1185
PUT
DELISTED
Liberty Media Corporation Series A Liberty SiriusXM Common Stock
LSXMA
| $7.62M | ﹤0.01% |
252,900
-47,700
| -16% | -$1.14M |
|
1186
Gold Fields
GFI
$29.4B
| $7.62M | ﹤0.01% |
+511,477
| New | +$8.31M |
|
1187
PUT
ProShares UltraShort Health Care
RXD
$3.3M
| $7.55M | ﹤0.01% |
110,450
-124,700
| -53% | -$2.73M |
|
1188
PUT
Trane Technologies
TT
$107B
| $7.53M | ﹤0.01% |
22,900
-1,400
| -6% | -$445K |
|
1189
PUT
NetEase
NTES
$76.8B
| $7.53M | ﹤0.01% |
78,800
+14,900
| +23% | +$1.42M |
|
1190
CALL
Innovative Industrial Properties
IIPR
$1.79B
| $7.53M | ﹤0.01% |
68,900
+47,100
| +216% | +$4.94M |
|
1191
CALL
Emcor
EME
$33.7B
| $7.52M | ﹤0.01% |
20,600
+7,400
| +56% | +$2.73M |
|
1192
ProShares Short QQQ
PSQ
$689M
| $7.52M | ﹤0.01% |
185,701
+171,007
| +1,164% | +$7.46M |
|
1193
PUT
Papa John's
PZZA
$1.02B
| $7.5M | ﹤0.01% |
159,600
+84,400
| +112% | +$4.62M |
|
1194
CALL
Welltower
WELL
$176B
| $7.5M | ﹤0.01% |
71,900
-28,100
| -28% | -$2.75M |
|
1195
CALL
Stanley Black & Decker
SWK
$14.2B
| $7.49M | ﹤0.01% |
93,700
+46,900
| +100% | +$4.13M |
|
1196
PUT
BJs Wholesale Club
BJ
$11.8B
| $7.47M | ﹤0.01% |
85,100
+36,300
| +74% | +$2.94M |
|
1197
Trump Media & Technology Group
DJT
$2.46B
| $7.46M | ﹤0.01% |
+227,803
| New | +$9.57M |
|
1198
CALL
Vanguard FTSE Europe ETF
VGK
$30B
| $7.46M | ﹤0.01% |
133,100
+15,900
| +14% | +$1.08M |
|
1199
PUT
Ecolab
ECL
$75.7B
| $7.45M | ﹤0.01% |
31,300
+11,800
| +61% | +$2.73M |
|
1200
Constellation Energy
CEG
$98.8B
| $7.43M | ﹤0.01% |
+37,126
| New | +$7.57M |
|
Similar funds
Simplex Trading's Q2 2024 Portfolio in Review
As of Q2 2024, Simplex Trading held 10,213 positions worth $162B, down 6.5% from $173B the previous quarter. Its ten largest holdings account for 50% of the portfolio.
Simplex Trading withdrew a net $19.2B in Q2 2024, closing 1,431 positions and reducing 4,061 holdings. Its most notable exit was Boeing, an estimated $61.6M position sold in full.
By sector, the portfolio is most concentrated in Technology at 0.53% of assets, up from 0.38% a quarter earlier, followed by Consumer Discretionary and Healthcare.
Against the trend, Simplex Trading opened a new position in Citigroup worth $77M.
- Simplex Trading's largest Q2 2024 buy was Citigroup: 1,213,247 shares worth $77M.
- Simplex Trading added most to NVIDIA in Q2 2024, an estimated $93M increase.
- Simplex Trading's biggest Q2 2024 reduction was State Street Energy Select Sector SPDR ETF, cutting an estimated $94.5M.
- Simplex Trading fully exited Boeing in Q2 2024, selling an estimated $61.6M.
- Simplex Trading's ten largest holdings make up 50% of its $162B portfolio in Q2 2024.
- Simplex Trading opened 1,358 new positions and closed 1,431 in Q2 2024.
- Simplex Trading's portfolio value fell 6.5% quarter-over-quarter to $162B.
Based on Simplex Trading's 13F filing for Q2 2024, filed 25 Jul 2024.