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 | |
|---|---|---|---|---|---|---|
5751
CALL
Artivion
AORT
$1.34B
| $59K | ﹤0.01% |
1,900
+300
| +19% | +$8.12K |
|
5752
PUT
Aspen Aerogels
ASPN
$374M
| $59K | ﹤0.01% |
10,100
-5,000
| -33% | -$28.8K |
|
|
DNB
5753
PUT
DELISTED
Dun & Bradstreet
DNB
| $59K | ﹤0.01% |
6,600
+5,700
| +633% | +$51K |
|
5754
CALL
Garrett Motion
GTX
$5.78B
| $59K | ﹤0.01% |
5,700
+4,100
| +256% | +$41.3K |
|
5755
CALL
Hayward Holdings
HAYW
$3.26B
| $59K | ﹤0.01% |
4,300
+4,100
| +2,050% | +$55.3K |
|
|
BRSL
5756
PUT
Brightstar Lottery PLC
BRSL
$1.87B
| $59K | ﹤0.01% |
33,600
+15,400
| +85% | +$242K |
|
5757
PUT
Inter&Co
INTR
$2.49B
| $59K | ﹤0.01% |
8,000
-2,500
| -24% | -$16.6K |
|
5758
CALL
National Fuel Gas
NFG
$7.84B
| $59K | ﹤0.01% |
700
-500
| -42% | -$40.4K |
|
5759
CALL
Nurix Therapeutics
NRIX
$2.45B
| $59K | ﹤0.01% |
5,200
-2,100
| -29% | -$22.7K |
|
5760
PUT
Opko Health
OPK
$993M
| $59K | ﹤0.01% |
44,900
-100
| -0.2% | -$137 |
|
5761
PUT
Repay Holdings
RPAY
$328M
| $59K | ﹤0.01% |
12,300
-200
| -2% | -$913 |
|
5762
CALL
Essential Utilities
WTRG
$11.4B
| $59K | ﹤0.01% |
1,600
| – | – |
|
|
LOGC
5763
DELISTED
ContextLogic
LOGC
| $59K | ﹤0.01% |
8,802
-12,885
| -59% | -$93K |
|
5764
Amprius Technologies
AMPX
$1.34B
| $58K | ﹤0.01% |
13,916
-32,187
| -70% | -$90.5K |
|
5765
CALL
Arhaus
ARHS
$1.04B
| $58K | ﹤0.01% |
6,800
+2,900
| +74% | +$24.2K |
|
5766
Beyond Meat
BYND
$286M
| $58K | ﹤0.01% |
16,666
-62,695
| -79% | -$182K |
|
5767
PUT
Calix
CALX
$2.22B
| $58K | ﹤0.01% |
1,100
+400
| +57% | +$17.1K |
|
|
HELP
5768
CALL
Cybin Inc
HELP
$505M
| $58K | ﹤0.01% |
7,000
-25,000
| -78% | -$182K |
|
5769
CALL
Endava
DAVA
$153M
| $58K | ﹤0.01% |
3,800
+1,800
| +90% | +$30.3K |
|
5770
CALL
GoodRx Holdings
GDRX
$1.07B
| $58K | ﹤0.01% |
11,800
-19,800
| -63% | -$86K |
|
5771
CALL
Gilat Satellite Networks
GILT
$830M
| $58K | ﹤0.01% |
8,200
+500
| +6% | +$3.11K |
|
5772
Health Catalyst
HCAT
$154M
| $58K | ﹤0.01% |
+15,513
| New | +$61K |
|
5773
CALL
Healthcare Realty
HR
$7.46B
| $58K | ﹤0.01% |
3,700
-5,100
| -58% | -$77.6K |
|
5774
CALL
Korn Ferry
KFY
$4.18B
| $58K | ﹤0.01% |
800
+500
| +167% | +$33.3K |
|
5775
CALL
CS Disco
LAW
$254M
| $58K | ﹤0.01% |
13,300
| – | – |
|
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.