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 | |
|---|---|---|---|---|---|---|
|
NBIS
476
PUT
Nebius Group N.V.
NBIS
$55.4B
| $25.8M | 0.01% |
467,000
+21,100
| +5% | +$726K |
|
|
AXON
477
PUT
Axon Enterprise
AXON
$39.6B
| $25.8M | 0.01% |
31,200
+200
| +0.6% | +$136K |
|
478
CALL
Lowe's Companies
LOW
$115B
| $25.6M | 0.01% |
115,500
-4,900
| -4% | -$1.09M |
|
479
Cigna
CI
$75.4B
| $25.4M | 0.01% |
76,861
-1,441
| -2% | -$465K |
|
480
PUT
Dollar Tree
DLTR
$23.5B
| $25.3M | 0.01% |
255,300
-165,400
| -39% | -$14.3M |
|
481
PUT
Comcast
CMCSA
$84B
| $25.2M | 0.01% |
705,500
+213,900
| +44% | +$7.4M |
|
482
PUT
Core Scientific
CORZ
$7.51B
| $25.2M | 0.01% |
1,474,700
+712,300
| +93% | +$7.13M |
|
483
SoFi Technologies
SOFI
$21.9B
| $25.1M | 0.01% |
1,380,363
+305,953
| +28% | +$4.03M |
|
484
CALL
Okta
OKTA
$23.8B
| $25.1M | 0.01% |
251,200
-31,300
| -11% | -$3.34M |
|
485
CALL
RH
RH
$3.31B
| $25.1M | 0.01% |
132,800
+70,300
| +112% | +$13.1M |
|
486
PUT
TJX Companies
TJX
$172B
| $24.9M | 0.01% |
201,700
+96,100
| +91% | +$12.2M |
|
487
CALL
Waste Management
WM
$94.9B
| $24.8M | 0.01% |
108,300
-44,500
| -29% | -$10.3M |
|
488
PUT
Nucor
NUE
$53.7B
| $24.8M | 0.01% |
191,200
-57,600
| -23% | -$6.73M |
|
489
CALL
XPeng
XPEV
$12.3B
| $24.8M | 0.01% |
1,384,500
-216,200
| -14% | -$4.22M |
|
490
PUT
CleanSpark
CLSK
$3.93B
| $24.7M | 0.01% |
2,241,000
+279,400
| +14% | +$2.49M |
|
491
PUT
Futu Holdings
FUTU
$14.9B
| $24.5M | 0.01% |
198,400
-30,200
| -13% | -$3.09M |
|
492
CALL
NIO
NIO
$11.7B
| $24.5M | 0.01% |
7,148,700
-4,339,700
| -38% | -$16.2M |
|
493
PUT
Hilton Worldwide
HLT
$73.8B
| $24.4M | 0.01% |
91,700
+40,600
| +79% | +$9.66M |
|
494
CALL
Devon Energy
DVN
$51.8B
| $24.4M | 0.01% |
766,900
-41,500
| -5% | -$1.32M |
|
495
CALL
Corning
GLW
$133B
| $24.3M | 0.01% |
462,900
-341,900
| -42% | -$16M |
|
496
PUT
Rio Tinto
RIO
$150B
| $24.1M | 0.01% |
413,900
+29,200
| +8% | +$1.72M |
|
497
PUT
Upstart Holdings
UPST
$2.74B
| $24.1M | 0.01% |
373,200
-233,500
| -38% | -$11.4M |
|
498
CALL
SAP
SAP
$174B
| $23.9M | 0.01% |
78,600
+36,700
| +88% | +$10.5M |
|
499
CALL
KKR & Co
KKR
$85.8B
| $23.9M | 0.01% |
179,500
-33,800
| -16% | -$3.96M |
|
500
PUT
Atlassian
TEAM
$21.7B
| $23.8M | 0.01% |
117,000
+32,700
| +39% | +$6.81M |
|
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.