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 | |
|---|---|---|---|---|---|---|
651
CALL
Peloton Interactive
PTON
$2.71B
| $15.6M | 0.01% |
2,244,100
+1,431,100
| +176% | +$9.3M |
|
652
PUT
Suncor Energy
SU
$76.4B
| $15.6M | 0.01% |
415,300
+66,700
| +19% | +$2.41M |
|
653
PUT
EOG Resources
EOG
$76.7B
| $15.5M | 0.01% |
130,000
-8,000
| -6% | -$914K |
|
654
CALL
Cleveland-Cliffs
CLF
$5.39B
| $15.5M | 0.01% |
2,035,400
+399,800
| +24% | +$2.97M |
|
655
CALL
Stryker
SYK
$119B
| $15.5M | 0.01% |
39,100
-200
| -0.5% | -$74.8K |
|
656
CALL
Albemarle
ALB
$13.9B
| $15.4M | 0.01% |
246,400
+188,700
| +327% | +$11.2M |
|
657
PUT
American International
AIG
$41.5B
| $15.4M | 0.01% |
180,400
-162,900
| -47% | -$13.6M |
|
658
PUT
Okta
OKTA
$23.8B
| $15.4M | 0.01% |
154,200
-68,200
| -31% | -$7.28M |
|
659
PUT
Kenvue
KVUE
$36.7B
| $15.4M | 0.01% |
736,000
+90,000
| +14% | +$2.05M |
|
660
PUT
General Mills
GIS
$19.7B
| $15.4M | 0.01% |
296,600
+56,900
| +24% | +$3.14M |
|
661
CALL
HCA Healthcare
HCA
$82.5B
| $15.4M | 0.01% |
40,100
+3,700
| +10% | +$1.33M |
|
662
CALL
BigBear.ai
BBAI
$1.38B
| $15.3M | 0.01% |
2,258,900
+149,900
| +7% | +$542K |
|
663
CALL
Synopsys
SNPS
$72.3B
| $15.3M | 0.01% |
29,900
+4,100
| +16% | +$1.91M |
|
664
PUT
Eaton
ETN
$158B
| $15.3M | 0.01% |
42,900
-24,800
| -37% | -$7.64M |
|
665
CALL
Canadian Natural Resources
CNQ
$95.5B
| $15.3M | 0.01% |
485,900
+98,200
| +25% | +$2.98M |
|
666
PUT
MetLife
MET
$60B
| $15.2M | 0.01% |
189,300
-57,500
| -23% | -$4.44M |
|
667
CALL
Cigna
CI
$75.4B
| $15.2M | 0.01% |
45,900
-4,200
| -8% | -$1.35M |
|
668
CALL
Dow Inc
DOW
$22.5B
| $15.1M | 0.01% |
567,400
-249,600
| -31% | -$7.26M |
|
669
CALL
Insmed
INSM
$23.1B
| $14.9M | 0.01% |
148,500
+115,500
| +350% | +$8.83M |
|
|
ETHA
670
CALL
iShares Ethereum Trust ETF
ETHA
$5.43B
| $14.9M | 0.01% |
+782,600
| New | +$13M |
|
671
CALL
Toronto Dominion Bank
TD
$200B
| $14.8M | 0.01% |
201,800
-31,700
| -14% | -$2.07M |
|
672
iShares MSCI Emerging Markets ETF
EEM
$28.8B
| $14.8M | 0.01% |
306,415
+142,501
| +87% | +$6.41M |
|
673
CALL
Automatic Data Processing
ADP
$97.2B
| $14.7M | 0.01% |
47,800
-6,200
| -11% | -$1.9M |
|
674
PUT
Progressive
PGR
$119B
| $14.7M | 0.01% |
55,100
+12,500
| +29% | +$3.43M |
|
675
CALL
AstraZeneca
AZN
$263B
| $14.7M | 0.01% |
105,200
-193,800
| -65% | -$27.2M |
|
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.