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 | |
|---|---|---|---|---|---|---|
1626
iShares 3-7 Year Treasury Bond ETF
IEI
$18.1B
| $3.59M | ﹤0.01% |
30,142
+17,184
| +133% | +$2.03M |
|
1627
GraniteShares 2x Long AMD Daily ETF
AMDL
$1.12B
| $3.59M | ﹤0.01% |
421,723
+283,100
| +204% | +$1.5M |
|
1628
CALL
Abercrombie & Fitch
ANF
$4.17B
| $3.59M | ﹤0.01% |
43,300
-49,100
| -53% | -$3.72M |
|
1629
PUT
GoDaddy
GDDY
$12.3B
| $3.58M | ﹤0.01% |
19,900
+6,700
| +51% | +$1.2M |
|
1630
FedEx
FDX
$74.5B
| $3.58M | ﹤0.01% |
15,752
+7,884
| +100% | +$1.73M |
|
1631
CALL
Boyd Gaming
BYD
$6.47B
| $3.58M | ﹤0.01% |
45,700
+12,600
| +38% | +$900K |
|
1632
Bloom Energy
BE
$52.6B
| $3.56M | ﹤0.01% |
148,869
+35,689
| +32% | +$691K |
|
1633
PUT
Toronto Dominion Bank
TD
$198B
| $3.55M | ﹤0.01% |
48,300
+7,100
| +17% | +$463K |
|
1634
CALL
Trane Technologies
TT
$106B
| $3.54M | ﹤0.01% |
8,100
+3,600
| +80% | +$1.42M |
|
1635
PUT
Bank of Montreal
BMO
$125B
| $3.54M | ﹤0.01% |
32,000
+23,800
| +290% | +$2.4M |
|
1636
PUT
ARK 21Shares Bitcoin ETF
ARKB
$2.45B
| $3.54M | ﹤0.01% |
98,900
+82,400
| +499% | +$2.7M |
|
1637
PUT
J.M. Smucker
SJM
$12.6B
| $3.52M | ﹤0.01% |
35,900
+10,500
| +41% | +$1.15M |
|
1638
CALL
dLocal
DLO
$4.26B
| $3.52M | ﹤0.01% |
310,600
-56,700
| -15% | -$558K |
|
1639
PUT
Old Dominion Freight Line
ODFL
$48.5B
| $3.52M | ﹤0.01% |
21,700
+12,900
| +147% | +$2.06M |
|
1640
CALL
Floor & Decor
FND
$5.81B
| $3.52M | ﹤0.01% |
46,300
+22,200
| +92% | +$1.65M |
|
1641
PUT
Manchester United
MANU
$3.91B
| $3.52M | ﹤0.01% |
197,400
-27,000
| -12% | -$400K |
|
1642
CALL
Shake Shack
SHAK
$2.3B
| $3.52M | ﹤0.01% |
25,000
+7,400
| +42% | +$806K |
|
|
EXAS
1643
CALL
DELISTED
Exact Sciences
EXAS
| $3.51M | ﹤0.01% |
66,100
-62,400
| -49% | -$3.17M |
|
1644
FirstEnergy
FE
$28.9B
| $3.5M | ﹤0.01% |
86,990
-78,489
| -47% | -$3.24M |
|
1645
PUT
Vanguard Short-Term Treasury ETF
VGSH
$29.3B
| $3.5M | ﹤0.01% |
42,900
+33,300
| +347% | +$1.95M |
|
1646
CALL
Agilent Technologies
A
$39.1B
| $3.49M | ﹤0.01% |
29,600
-7,700
| -21% | -$853K |
|
1647
CALL
Bank OZK
OZK
$5.49B
| $3.48M | ﹤0.01% |
74,000
+1,700
| +2% | +$74.4K |
|
1648
PUT
Dropbox
DBX
$6.81B
| $3.48M | ﹤0.01% |
121,700
-99,100
| -45% | -$2.81M |
|
|
PR
1649
PUT
Permian Resources
PR
$17.9B
| $3.48M | ﹤0.01% |
255,200
+77,000
| +43% | +$990K |
|
1650
PUT
PPG Industries
PPG
$25.9B
| $3.47M | ﹤0.01% |
30,500
-10,800
| -26% | -$1.17M |
|
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.