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 |
Pfizer
PFE
|
+$89.5M |
| 2 |
State Street Energy Select Sector SPDR ETF
XLE
|
+$85.5M |
| 3 |
Boeing
BA
|
+$71M |
| 4 |
Intel
INTC
|
+$60.7M |
| 5 |
Meta Platforms (Facebook)
META
|
+$48.3M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
NVIDIA
NVDA
|
+$117M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$104M |
| 3 |
Alibaba
BABA
|
+$82.8M |
| 4 |
Walt Disney
DIS
|
+$68.5M |
| 5 |
Citigroup
C
|
+$59.8M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.38% |
| 2 | Healthcare | 0.27% |
| 3 | Consumer Discretionary | 0.25% |
| 4 | Industrials | 0.17% |
| 5 | Communication Services | 0.16% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
1176
CALL
Restaurant Brands International
QSR
$25.1B
| $9.22M | 0.01% |
116,100
-29,200
| -20% | -$2.28M |
|
1177
PUT
Illumina
ILMN
$29.4B
| $9.2M | 0.01% |
68,876
-95,193
| -58% | -$12.8M |
|
|
MRSH
1178
CALL
Marsh
MRSH
$86.3B
| $9.19M | 0.01% |
44,600
-22,800
| -34% | -$4.54M |
|
1179
CALL
Samsara
IOT
$19.3B
| $9.18M | 0.01% |
242,900
-37,100
| -13% | -$1.26M |
|
1180
PUT
PPG Industries
PPG
$25.9B
| $9.17M | 0.01% |
63,300
-11,500
| -15% | -$1.63M |
|
1181
PUT
Parker-Hannifin
PH
$125B
| $9.17M | 0.01% |
16,500
-3,000
| -15% | -$1.52M |
|
1182
CALL
Plug Power
PLUG
$2.92B
| $9.17M | 0.01% |
2,665,400
-290,800
| -10% | -$1.08M |
|
1183
PUT
L3Harris
LHX
$55.9B
| $9.16M | 0.01% |
43,000
-50,300
| -54% | -$10.6M |
|
1184
PUT
Elbit Systems
ESLT
$38.4B
| $9.14M | 0.01% |
43,500
+23,700
| +120% | +$4.93M |
|
1185
CALL
MasTec
MTZ
$26.7B
| $9.13M | 0.01% |
97,900
-19,500
| -17% | -$1.48M |
|
1186
CALL
Centene
CNC
$31.3B
| $9.12M | 0.01% |
116,200
-17,600
| -13% | -$1.36M |
|
1187
CALL
Comfort Systems
FIX
$61B
| $9.12M | 0.01% |
28,700
+22,600
| +370% | +$5.77M |
|
1188
Fortinet
FTNT
$112B
| $9.1M | 0.01% |
+133,256
| New | +$8.87M |
|
1189
PUT
Rapid7
RPD
$634M
| $9.1M | 0.01% |
185,500
+12,400
| +7% | +$680K |
|
1190
PUT
Deutsche Bank
DB
$66.3B
| $9.09M | 0.01% |
576,400
+7,000
| +1% | +$95.7K |
|
1191
Las Vegas Sands
LVS
$30.5B
| $9.09M | 0.01% |
175,765
+113,329
| +182% | +$5.83M |
|
1192
PUT
Baxter International
BAX
$11.6B
| $9.08M | 0.01% |
212,400
+71,100
| +50% | +$2.89M |
|
1193
PUT
Corning
GLW
$126B
| $9.04M | 0.01% |
274,300
+82,200
| +43% | +$2.62M |
|
1194
PUT
Synchrony
SYF
$23.7B
| $9.03M | 0.01% |
209,400
-209,800
| -50% | -$8.36M |
|
1195
PUT
Vodafone
VOD
$34.9B
| $8.99M | 0.01% |
1,010,700
+262,100
| +35% | +$2.28M |
|
|
FLG
1196
PUT
Flagstar Bank National Association
FLG
$5.77B
| $8.98M | 0.01% |
929,500
+895,967
| +2,672% | +$16.6M |
|
1197
PUT
Noble Corp
NE
$6.9B
| $8.95M | 0.01% |
184,500
+111,400
| +152% | +$5.01M |
|
1198
CALL
Alamos Gold
AGI
$12.4B
| $8.94M | 0.01% |
606,000
-113,500
| -16% | -$1.43M |
|
1199
PUT
Clean Harbors
CLH
$16.1B
| $8.92M | 0.01% |
44,300
+22,700
| +105% | +$4.08M |
|
1200
CALL
DigitalBridge
DBRG
$2.94B
| $8.92M | 0.01% |
462,700
+150,600
| +48% | +$2.83M |
|
Similar funds
Simplex Trading's Q1 2024 Portfolio in Review
As of Q1 2024, Simplex Trading held 10,366 positions worth $173B, up 11% from $156B the previous quarter. Its ten largest holdings account for 47% of the portfolio.
Simplex Trading's Q1 2024 filing shows 1,549 new, 3,675 increased, 3,484 reduced and 1,506 closed positions. Its largest new stake was Boeing: 345,653 shares worth $66.7M. The largest sale was NVIDIA, an estimated $117M.
By sector, the portfolio is most concentrated in Technology at 0.38% of assets, up from 0.33% a quarter earlier, followed by Healthcare and Consumer Discretionary.
- Simplex Trading's largest Q1 2024 buy was Boeing: 345,653 shares worth $66.7M.
- Simplex Trading added most to Pfizer in Q1 2024, an estimated $89.5M increase.
- Simplex Trading's biggest Q1 2024 reduction was NVIDIA, cutting an estimated $117M.
- Simplex Trading fully exited Citigroup in Q1 2024, selling an estimated $59.8M.
- Simplex Trading's ten largest holdings make up 47% of its $173B portfolio in Q1 2024.
- Simplex Trading opened 1,549 new positions and closed 1,506 in Q1 2024.
- Simplex Trading's portfolio value rose 11% quarter-over-quarter to $173B.
Based on Simplex Trading's 13F filing for Q1 2024, filed 25 Apr 2024.