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 | |
|---|---|---|---|---|---|---|
4951
PUT
Veru
VERU
$35.5M
| $133K | ﹤0.01% |
22,920
-84,300
| -79% | -$473K |
|
4952
Chord Energy
CHRD
$7.68B
| $132K | ﹤0.01% |
1,363
-1,550
| -53% | -$148K |
|
4953
CALL
Crane Co
CR
$11.9B
| $132K | ﹤0.01% |
700
-14,000
| -95% | -$2.32M |
|
4954
CALL
Descartes Systems
DSGX
$6.68B
| $132K | ﹤0.01% |
1,300
+1,200
| +1,200% | +$127K |
|
4955
PUT
Global Net Lease
GNL
$1.87B
| $132K | ﹤0.01% |
17,600
+6,700
| +61% | +$50.8K |
|
|
HPP
4956
CALL
Hudson Pacific Properties
HPP
$758M
| $132K | ﹤0.01% |
6,900
+4,157
| +152% | +$67.4K |
|
4957
CALL
Heritage Insurance Holdings
HRTG
$903M
| $132K | ﹤0.01% |
5,300
-2,100
| -28% | -$44.8K |
|
4958
RF Industries
RFIL
$116M
| $132K | ﹤0.01% |
+20,514
| New | +$87.5K |
|
4959
CALL
Rezolute
RZLT
$453M
| $132K | ﹤0.01% |
29,600
+28,600
| +2,860% | +$106K |
|
4960
CALL
Atmus Filtration Technologies
ATMU
$4.12B
| $131K | ﹤0.01% |
3,600
-12,900
| -78% | -$460K |
|
4961
PUT
Buckle
BKE
$2.32B
| $131K | ﹤0.01% |
2,900
-2,000
| -41% | -$79.1K |
|
4962
PUT
First Financial Bancorp
FFBC
$3.55B
| $131K | ﹤0.01% |
+5,400
| New | +$128K |
|
4963
PUT
Neurogene
NGNE
$672M
| $131K | ﹤0.01% |
8,800
+2,800
| +47% | +$43.9K |
|
4964
CALL
Arcosa
ACA
$7.11B
| $130K | ﹤0.01% |
+1,500
| New | +$125K |
|
4965
CALL
Accel Entertainment
ACEL
$1B
| $130K | ﹤0.01% |
11,100
-169,800
| -94% | -$1.89M |
|
4966
Atomera
ATOM
$173M
| $130K | ﹤0.01% |
25,941
-16,059
| -38% | -$85.7K |
|
4967
Krispy Kreme
DNUT
$562M
| $130K | ﹤0.01% |
44,981
+10,684
| +31% | +$37.3K |
|
4968
CALL
WisdomTree US Total Dividend Fund
DTD
$1.64B
| $130K | ﹤0.01% |
2,100
-1,700
| -45% | -$129K |
|
4969
First Trust Natural Gas ETF
FCG
$632M
| $130K | ﹤0.01% |
5,655
-16,896
| -75% | -$378K |
|
4970
CALL
Structure Therapeutics
GPCR
$3.37B
| $130K | ﹤0.01% |
6,300
-9,500
| -60% | -$209K |
|
4971
National Health Investors
NHI
$3.79B
| $130K | ﹤0.01% |
+1,854
| New | +$136K |
|
4972
CALL
Protalix BioTherapeutics
PLX
$183M
| $130K | ﹤0.01% |
88,400
-10,500
| -11% | -$21.5K |
|
4973
PUT
Red Rock Resorts
RRR
$3.84B
| $130K | ﹤0.01% |
2,500
+1,300
| +108% | +$59.4K |
|
4974
CALL
Alector
ALEC
$169M
| $129K | ﹤0.01% |
92,800
-105,300
| -53% | -$132K |
|
|
4975
PUT
WisdomTree US Total Dividend Fund
DTD
$1.64B
| $129K | ﹤0.01% |
2,700
-3,500
| -56% | -$265K |
|
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.