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 | |
|---|---|---|---|---|---|---|
801
PUT
Monolithic Power Systems
MPWR
$68.6B
| $13.8M | 0.01% |
16,800
-12,200
| -42% | -$8.8M |
|
802
PUT
Hilton Worldwide
HLT
$72.9B
| $13.8M | 0.01% |
63,200
-72,000
| -53% | -$14.8M |
|
803
PUT
Fidelity National Information Services
FIS
$20.7B
| $13.8M | 0.01% |
182,900
-72,500
| -28% | -$5.37M |
|
804
CALL
MGM Resorts International
MGM
$11.5B
| $13.8M | 0.01% |
310,100
-3,600
| -1% | -$150K |
|
805
PUT
Wolfspeed
WOLF
$1.35B
| $13.7M | 0.01% |
603,400
-33,500
| -5% | -$866K |
|
806
Twilio
TWLO
$28.1B
| $13.7M | 0.01% |
241,571
+160,657
| +199% | +$9.48M |
|
807
PUT
Peabody Energy
BTU
$2.9B
| $13.7M | 0.01% |
619,200
-666,500
| -52% | -$15.4M |
|
808
PUT
OneMain Financial
OMF
$6.79B
| $13.7M | 0.01% |
282,300
-34,500
| -11% | -$1.7M |
|
809
PUT
Enovix
ENVX
$947M
| $13.7M | 0.01% |
1,010,171
+223,085
| +28% | +$1.87M |
|
810
PUT
McCormick & Company Non-Voting
MKC
$13.5B
| $13.7M | 0.01% |
192,500
+86,000
| +81% | +$6.26M |
|
811
CALL
ResMed
RMD
$27.8B
| $13.6M | 0.01% |
71,300
+42,600
| +148% | +$8.64M |
|
812
PUT
HubSpot
HUBS
$9.73B
| $13.6M | 0.01% |
23,100
+4,000
| +21% | +$2.45M |
|
813
CALL
Shift4
FOUR
$3.68B
| $13.6M | 0.01% |
185,600
+18,700
| +11% | +$1.24M |
|
814
PUT
HP
HPQ
$22.4B
| $13.6M | 0.01% |
388,600
-385,500
| -50% | -$12.2M |
|
815
CALL
Antero Resources
AR
$10.9B
| $13.6M | 0.01% |
416,600
-66,200
| -14% | -$2.17M |
|
816
CALL
Automatic Data Processing
ADP
$97.1B
| $13.6M | 0.01% |
56,900
-13,800
| -20% | -$3.39M |
|
817
CALL
Constellation Brands
STZ
$22.1B
| $13.5M | 0.01% |
52,600
-22,200
| -30% | -$5.71M |
|
818
CALL
Five Below
FIVE
$11.1B
| $13.5M | 0.01% |
124,100
+16,700
| +16% | +$2.31M |
|
819
CALL
Seagate
STX
$207B
| $13.5M | 0.01% |
130,700
-246,600
| -65% | -$23M |
|
820
CALL
Trump Media & Technology Group
DJT
$2.46B
| $13.5M | 0.01% |
411,300
+124,800
| +44% | +$5.24M |
|
821
PUT
Boyd Gaming
BYD
$6.43B
| $13.5M | 0.01% |
244,300
+193,700
| +383% | +$11.1M |
|
822
CALL
Cardinal Health
CAH
$52.9B
| $13.5M | 0.01% |
136,900
-17,400
| -11% | -$1.77M |
|
823
CALL
Johnson Controls International
JCI
$87.4B
| $13.4M | 0.01% |
201,900
-238,500
| -54% | -$16.1M |
|
824
PUT
Kroger
KR
$34.2B
| $13.4M | 0.01% |
268,200
-88,200
| -25% | -$4.75M |
|
825
PUT
Allstate
ALL
$65.5B
| $13.4M | 0.01% |
83,800
-16,200
| -16% | -$2.7M |
|
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.