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
|
+$172M |
| 2 |
Apple
AAPL
|
+$156M |
| 3 |
Broadcom
AVGO
|
+$101M |
| 4 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$57.2M |
| 5 |
UnitedHealth
UNH
|
+$55.1M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$140M |
| 2 |
Amazon
AMZN
|
+$47.9M |
| 3 |
Netflix
NFLX
|
+$38.3M |
| 4 |
TSMC
TSM
|
+$37.3M |
| 5 |
Pfizer
PFE
|
+$36.9M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.74% |
| 2 | Communication Services | 0.19% |
| 3 | Consumer Discretionary | 0.18% |
| 4 | Healthcare | 0.17% |
| 5 | Financials | 0.14% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
926
Delta Air Lines
DAL
$53.9B
| $9.35M | 0.01% |
+190,017
| New | +$8.72M |
|
927
CALL
NetApp
NTAP
$32.3B
| $9.34M | 0.01% |
87,700
-48,200
| -35% | -$4.57M |
|
|
P
928
CALL
Everpure Inc
P
$25B
| $9.34M | 0.01% |
162,200
-20,700
| -11% | -$1.03M |
|
929
CALL
Zeta Global
ZETA
$4.83B
| $9.32M | 0.01% |
601,700
+286,500
| +91% | +$3.81M |
|
930
CALL
GitLab
GTLB
$5.1B
| $9.32M | 0.01% |
206,600
-25,400
| -11% | -$1.16M |
|
931
CALL
Global E Online
GLBE
$5.79B
| $9.31M | 0.01% |
277,700
+35,100
| +14% | +$1.18M |
|
932
Crown Castle
CCI
$32.5B
| $9.31M | 0.01% |
90,620
+28,088
| +45% | +$2.84M |
|
933
NRG Energy
NRG
$30.2B
| $9.31M | 0.01% |
57,955
+15,575
| +37% | +$2.05M |
|
934
CALL
Kenvue
KVUE
$36.3B
| $9.3M | 0.01% |
444,600
-271,600
| -38% | -$6.18M |
|
935
PUT
VeriSign
VRSN
$23.8B
| $9.3M | 0.01% |
32,200
-10,400
| -24% | -$2.82M |
|
936
CALL
MetLife
MET
$59.5B
| $9.28M | 0.01% |
115,400
-26,700
| -19% | -$2.06M |
|
937
CALL
Illumina
ILMN
$29.8B
| $9.28M | 0.01% |
103,200
+53,600
| +108% | +$4.35M |
|
938
CALL
Marathon Petroleum
MPC
$91.2B
| $9.27M | 0.01% |
55,800
-3,000
| -5% | -$450K |
|
939
CALL
Zillow
Z
$6.77B
| $9.26M | 0.01% |
132,300
-118,200
| -47% | -$7.96M |
|
940
PUT
Truist Financial
TFC
$62.5B
| $9.25M | 0.01% |
215,100
-222,500
| -51% | -$8.71M |
|
941
PUT
PureCycle Technologies
PCT
$1.21B
| $9.24M | 0.01% |
674,400
+503,600
| +295% | +$4.46M |
|
942
PUT
Analog Devices
ADI
$185B
| $9.23M | 0.01% |
38,800
-27,500
| -41% | -$5.73M |
|
943
CALL
Ginkgo Bioworks
DNA
$518M
| $9.2M | 0.01% |
817,800
+242,300
| +42% | +$1.88M |
|
944
CALL
PENN Entertainment
PENN
$2.71B
| $9.2M | 0.01% |
514,800
-134,000
| -21% | -$2.1M |
|
945
PUT
Eos Energy Enterprises
EOSE
$1.32B
| $9.2M | 0.01% |
1,796,400
+801,200
| +81% | +$3.93M |
|
946
PUT
AstraZeneca
AZN
$261B
| $9.2M | 0.01% |
65,800
-200
| -0.3% | -$28K |
|
947
PUT
Nextpower Inc
NXT
$15.8B
| $9.17M | 0.01% |
168,700
+58,300
| +53% | +$2.92M |
|
948
PUT
Stanley Black & Decker
SWK
$13.6B
| $9.15M | 0.01% |
135,000
+58,000
| +75% | +$3.74M |
|
949
CALL
American Tower
AMT
$76.7B
| $9.13M | 0.01% |
41,300
-5,300
| -11% | -$1.14M |
|
950
PUT
Ally Financial
ALLY
$13.4B
| $9.1M | 0.01% |
233,600
-58,200
| -20% | -$2.02M |
|
Similar funds
Simplex Trading's Q2 2025 Portfolio in Review
As of Q2 2025, Simplex Trading held 10,048 positions worth $175B, up 12% from $156B the previous quarter. Its ten largest holdings account for 47% of the portfolio.
Simplex Trading withdrew a net $10.5B in Q2 2025, closing 1,431 positions and reducing 3,590 holdings. Its most notable exit was Constellation Energy, an estimated $35.8M position sold in full.
By sector, the portfolio is most concentrated in Technology at 0.74% of assets, up from 0.41% a quarter earlier, followed by Communication Services and Consumer Discretionary.
Against the trend, Simplex Trading opened a new position in State Street SPDR S&P 500 ETF Trust worth $61.9M.
- Simplex Trading's largest Q2 2025 buy was State Street SPDR S&P 500 ETF Trust: 100,129 shares worth $61.9M.
- Simplex Trading added most to NVIDIA in Q2 2025, an estimated $172M increase.
- Simplex Trading's biggest Q2 2025 reduction was iShares 20+ Year Treasury Bond ETF, cutting an estimated $140M.
- Simplex Trading fully exited Constellation Energy in Q2 2025, selling an estimated $35.8M.
- Simplex Trading's ten largest holdings make up 47% of its $175B portfolio in Q2 2025.
- Simplex Trading opened 1,525 new positions and closed 1,431 in Q2 2025.
- Simplex Trading's portfolio value rose 12% quarter-over-quarter to $175B.
Based on Simplex Trading's 13F filing for Q2 2025, filed 5 Aug 2025.