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 | |
|---|---|---|---|---|---|---|
1026
PUT
Ralph Lauren
RL
$22.1B
| $8.06M | ﹤0.01% |
29,400
+17,600
| +149% | +$4.36M |
|
1027
PUT
Cognizant
CTSH
$20.3B
| $8.05M | ﹤0.01% |
103,200
-181,700
| -64% | -$13.9M |
|
1028
CALL
Lucid Motors
LCID
$2.52B
| $8.03M | ﹤0.01% |
380,630
+141,340
| +59% | +$3.38M |
|
1029
CALL
GoDaddy
GDDY
$11.6B
| $8.03M | ﹤0.01% |
44,600
-15,300
| -26% | -$2.75M |
|
1030
CALL
Sarepta Therapeutics
SRPT
$1.68B
| $8.03M | ﹤0.01% |
469,500
+416,300
| +783% | +$17.8M |
|
1031
Qualcomm
QCOM
$180B
| $8.03M | ﹤0.01% |
+50,398
| New | +$7.42M |
|
1032
PUT
GitLab
GTLB
$5.1B
| $8.03M | ﹤0.01% |
177,900
+25,600
| +17% | +$1.17M |
|
1033
CALL
Brookfield
BN
$101B
| $7.98M | ﹤0.01% |
193,500
+85,950
| +80% | +$3.19M |
|
1034
PUT
iShares Core MSCI Emerging Markets ETF
IEMG
$152B
| $7.97M | ﹤0.01% |
118,800
-61,700
| -34% | -$3.44M |
|
1035
PUT
Crocs
CROX
$6.58B
| $7.97M | ﹤0.01% |
78,700
-15,600
| -17% | -$1.59M |
|
1036
CALL
Vanguard Consumer Discretionary ETF
VCR
$5.81B
| $7.97M | ﹤0.01% |
33,100
+18,100
| +121% | +$6.14M |
|
1037
PUT
Whirlpool
WHR
$2.31B
| $7.96M | ﹤0.01% |
78,500
-11,800
| -13% | -$982K |
|
1038
PUT
Northrop Grumman
NOC
$75.8B
| $7.95M | ﹤0.01% |
15,900
-19,600
| -55% | -$9.63M |
|
1039
CALL
TripAdvisor
TRIP
$1.57B
| $7.93M | ﹤0.01% |
607,900
+21,900
| +4% | +$293K |
|
1040
Dell
DELL
$284B
| $7.9M | ﹤0.01% |
64,474
-189,459
| -75% | -$19.4M |
|
1041
PUT
MP Materials
MP
$7.95B
| $7.89M | ﹤0.01% |
237,200
+150,300
| +173% | +$3.84M |
|
|
QXO
1042
CALL
QXO Inc
QXO
$14.4B
| $7.89M | ﹤0.01% |
366,300
+275,500
| +303% | +$4.52M |
|
1043
CALL
Enovix
ENVX
$947M
| $7.89M | ﹤0.01% |
871,657
+295,200
| +51% | +$1.93M |
|
1044
CALL
Dutch Bros
BROS
$8.78B
| $7.88M | ﹤0.01% |
115,200
-118,800
| -51% | -$7.75M |
|
1045
PUT
American Conservative Values ETF
ACVF
$149M
| $7.87M | ﹤0.01% |
506,500
-246,900
| -33% | -$10.8M |
|
1046
CALL
Nice
NICE
$5.09B
| $7.8M | ﹤0.01% |
46,200
-125,800
| -73% | -$20.3M |
|
1047
PUT
AES
AES
$10.6B
| $7.79M | ﹤0.01% |
740,300
+306,500
| +71% | +$3.28M |
|
1048
CALL
Ball Corp
BALL
$16.6B
| $7.78M | ﹤0.01% |
138,700
+13,700
| +11% | +$716K |
|
1049
CALL
Hilton Worldwide
HLT
$72.9B
| $7.72M | ﹤0.01% |
29,000
+14,200
| +96% | +$3.38M |
|
1050
Centene
CNC
$31.5B
| $7.7M | ﹤0.01% |
141,894
+136,020
| +2,316% | +$7.98M |
|
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.