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 | |
|---|---|---|---|---|---|---|
1776
CALL
C.H. Robinson
CHRW
$22B
| $2.94M | ﹤0.01% |
30,600
-33,800
| -52% | -$3.17M |
|
1777
CALL
First Citizens BancShares
FCNCA
$24.6B
| $2.93M | ﹤0.01% |
1,500
+1,200
| +400% | +$2.18M |
|
1778
CALL
Lattice Semiconductor
LSCC
$17.6B
| $2.93M | ﹤0.01% |
59,800
-10,700
| -15% | -$512K |
|
1779
PUT
Carrier Global
CARR
$57.2B
| $2.92M | ﹤0.01% |
39,900
-3,100
| -7% | -$210K |
|
1780
CALL
Cal-Maine
CALM
$4.28B
| $2.92M | ﹤0.01% |
29,300
+4,700
| +19% | +$449K |
|
1781
CALL
Energy Fuels
UUUU
$2.82B
| $2.92M | ﹤0.01% |
507,700
+35,500
| +8% | +$170K |
|
1782
Norwegian Cruise Line
NCLH
$8.89B
| $2.92M | ﹤0.01% |
+143,802
| New | +$2.57M |
|
1783
CALL
FIVE9
FIVN
$1.77B
| $2.91M | ﹤0.01% |
109,800
-60,800
| -36% | -$1.58M |
|
1784
CALL
Host Hotels & Resorts
HST
$16.8B
| $2.91M | ﹤0.01% |
189,200
-75,200
| -28% | -$1.11M |
|
1785
monday.com
MNDY
$3.27B
| $2.9M | ﹤0.01% |
9,234
+7,112
| +335% | +$1.98M |
|
1786
CALL
BellRing Brands
BRBR
$1.51B
| $2.9M | ﹤0.01% |
+50,000
| New | +$3.34M |
|
1787
PUT
Sarepta Therapeutics
SRPT
$1.66B
| $2.9M | ﹤0.01% |
169,400
+143,200
| +547% | +$6.11M |
|
|
SERV
1788
CALL
Serve Robotics
SERV
$409M
| $2.9M | ﹤0.01% |
253,200
-83,900
| -25% | -$737K |
|
1789
CALL
ScottsMiracle-Gro
SMG
$4.03B
| $2.9M | ﹤0.01% |
43,900
-54,400
| -55% | -$3.15M |
|
1790
CALL
Warner Music
WMG
$13.8B
| $2.9M | ﹤0.01% |
106,300
-50,000
| -32% | -$1.4M |
|
1791
CALL
American Superconductor
AMSC
$1.48B
| $2.89M | ﹤0.01% |
78,900
+10,300
| +15% | +$253K |
|
1792
PUT
Baker Hughes
BKR
$56.8B
| $2.89M | ﹤0.01% |
75,400
-46,200
| -38% | -$1.74M |
|
1793
CALL
FuelCell Energy
FCEL
$1.7B
| $2.88M | ﹤0.01% |
514,000
-20,100
| -4% | -$97.5K |
|
1794
PUT
H&R Block
HRB
$5.18B
| $2.88M | ﹤0.01% |
52,500
+25,700
| +96% | +$1.48M |
|
1795
EQT Corp
EQT
$33.2B
| $2.87M | ﹤0.01% |
+49,291
| New | +$2.66M |
|
1796
Planet Fitness
PLNT
$4.23B
| $2.87M | ﹤0.01% |
26,363
+13,314
| +102% | +$1.33M |
|
1797
CALL
Acadia Healthcare
ACHC
$3.17B
| $2.87M | ﹤0.01% |
126,600
+55,200
| +77% | +$1.31M |
|
1798
Novartis
NVS
$295B
| $2.87M | ﹤0.01% |
+23,703
| New | +$2.67M |
|
|
KC
1799
CALL
Kingsoft Cloud Holdings
KC
$2.84B
| $2.87M | ﹤0.01% |
229,000
+112,800
| +97% | +$1.46M |
|
1800
CALL
WillScot Mobile Mini Holdings
WSC
$4.8B
| $2.85M | ﹤0.01% |
104,200
-263,500
| -72% | -$7.02M |
|
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.