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 | |
|---|---|---|---|---|---|---|
776
PUT
Chewy
CHWY
$8.55B
| $12.1M | 0.01% |
283,500
-123,700
| -30% | -$4.93M |
|
777
PUT
Commault Systems
CVLT
$5.8B
| $12.1M | 0.01% |
69,200
+14,800
| +27% | +$2.53M |
|
778
PUT
Sempra
SRE
$61.1B
| $12.1M | 0.01% |
159,200
-4,400
| -3% | -$327K |
|
779
CALL
Blue Owl Capital
OWL
$6.31B
| $12M | 0.01% |
626,800
+314,300
| +101% | +$5.81M |
|
780
PUT
CAVA Group
CAVA
$7.25B
| $12M | 0.01% |
142,500
+33,400
| +31% | +$2.85M |
|
|
BNY
781
CALL
Bank of New York Mellon
BNY
$108B
| $12M | 0.01% |
131,600
-107,400
| -45% | -$9.12M |
|
782
CALL
iShares Gold Trust
IAU
$62.9B
| $11.9M | 0.01% |
191,600
-79,400
| -29% | -$4.92M |
|
783
PUT
Amphenol
APH
$195B
| $11.9M | 0.01% |
289,100
+126,700
| +78% | +$10.4M |
|
784
PUT
Generac Holdings
GNRC
$12.6B
| $11.9M | 0.01% |
82,900
+14,400
| +21% | +$1.76M |
|
785
CALL
Oneok
OKE
$58.9B
| $11.9M | 0.01% |
145,400
-58,600
| -29% | -$4.89M |
|
786
Global X Uranium ETF
URA
$5.7B
| $11.8M | 0.01% |
304,577
+125,506
| +70% | +$3.64M |
|
787
CALL
Live Nation Entertainment
LYV
$41.3B
| $11.8M | 0.01% |
77,800
-21,300
| -21% | -$2.93M |
|
788
PUT
PENN Entertainment
PENN
$2.76B
| $11.8M | 0.01% |
658,200
-128,700
| -16% | -$2.02M |
|
789
CALL
Invesco DB US Dollar Index Bullish Fund
UUP
$434M
| $11.7M | 0.01% |
554,200
+139,800
| +34% | +$3.85M |
|
790
CALL
Credo Technology Group
CRDO
$43.7B
| $11.7M | 0.01% |
126,700
-39,700
| -24% | -$2.32M |
|
791
CALL
CoStar Group
CSGP
$11.3B
| $11.7M | 0.01% |
145,900
-26,000
| -15% | -$2.03M |
|
792
CALL
Mobileye
MBLY
$6.46B
| $11.7M | 0.01% |
652,400
-12,800
| -2% | -$196K |
|
793
PUT
Archer Daniels Midland
ADM
$42.3B
| $11.7M | 0.01% |
222,100
-12,100
| -5% | -$589K |
|
794
PUT
AB InBev
BUD
$155B
| $11.7M | 0.01% |
170,500
+5,800
| +4% | +$390K |
|
795
PUT
TeraWulf
WULF
$9.95B
| $11.7M | 0.01% |
2,673,300
+1,239,200
| +86% | +$4.23M |
|
796
CALL
Northern Trust
NTRS
$21.7B
| $11.7M | 0.01% |
92,300
+79,600
| +627% | +$8.14M |
|
797
CALL
American Conservative Values ETF
ACVF
$149M
| $11.7M | 0.01% |
1,100,300
-1,041,700
| -49% | -$45.7M |
|
798
PUT
BJs Wholesale Club
BJ
$11.6B
| $11.7M | 0.01% |
108,300
+67,700
| +167% | +$7.71M |
|
799
PUT
Waste Management
WM
$95.9B
| $11.6M | 0.01% |
50,900
+13,600
| +36% | +$3.15M |
|
800
PUT
Petrobras
PBR
$124B
| $11.6M | 0.01% |
931,900
-607,700
| -39% | -$7.28M |
|
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.