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 | |
|---|---|---|---|---|---|---|
6026
GraniteShares 2x Short NVDA Daily ETF
NVD
$66.1M
| $45K | ﹤0.01% |
3,564
-1,194
| -25% | -$27.1K |
|
6027
Invesco Semiconductors ETF
PSI
$2.03B
| $45K | ﹤0.01% |
753
+671
| +818% | +$33.8K |
|
6028
PUT
Prudential
PUK
$36.4B
| $45K | ﹤0.01% |
1,800
+1,100
| +157% | +$24.6K |
|
|
RNAM
6029
PUT
DELISTED
Avidity Biosciences
RNAM
| $45K | ﹤0.01% |
1,600
+800
| +100% | +$23.8K |
|
6030
CALL
Sally Beauty Holdings
SBH
$1.47B
| $45K | ﹤0.01% |
4,900
+3,600
| +277% | +$31K |
|
6031
CALL
Sylvamo
SLVM
$1.52B
| $45K | ﹤0.01% |
900
+800
| +800% | +$45K |
|
6032
CALL
Cambria Tail Risk ETF
TAIL
$150M
| $45K | ﹤0.01% |
700
+400
| +133% | +$4.97K |
|
6033
CALL
Viavi Solutions
VIAV
$7.95B
| $45K | ﹤0.01% |
4,500
-4,800
| -52% | -$46.4K |
|
6034
CALL
Vicor
VICR
$8.33B
| $45K | ﹤0.01% |
1,000
-5,700
| -85% | -$255K |
|
6035
VistaGen Therapeutics
VTGN
$9.98M
| $45K | ﹤0.01% |
22,536
+20,134
| +838% | +$45.7K |
|
6036
CALL
WD-40
WDFC
$2.98B
| $45K | ﹤0.01% |
200
-1,900
| -90% | -$447K |
|
6037
CALL
Xperi
XPER
$364M
| $45K | ﹤0.01% |
+5,700
| New | +$43K |
|
|
LLYX
6038
Defiance Daily Target 2x Long LLY ETF
LLYX
$60.6M
| $45K | ﹤0.01% |
+2,895
| New | +$47.4K |
|
6039
CALL
Arena Group
AREN
$55.2M
| $44K | ﹤0.01% |
+7,200
| New | +$35.4K |
|
6040
CALL
Aterian
ATER
$4.07M
| $44K | ﹤0.01% |
27,100
+10,400
| +62% | +$17.7K |
|
6041
PUT
Chefs' Warehouse
CHEF
$4.31B
| $44K | ﹤0.01% |
700
-100
| -13% | -$5.94K |
|
6042
CALL
Flowers Foods
FLO
$1.58B
| $44K | ﹤0.01% |
2,800
-13,200
| -83% | -$228K |
|
6043
CALL
Huazhu Hotels Group
HTHT
$13.3B
| $44K | ﹤0.01% |
1,300
-2,700
| -68% | -$94.6K |
|
6044
PUT
Intellicheck
IDN
$75.1M
| $44K | ﹤0.01% |
+8,200
| New | +$31.4K |
|
6045
CALL
Lufax Holding
LU
$1.33B
| $44K | ﹤0.01% |
16,000
-30,500
| -66% | -$86.1K |
|
6046
PUT
Nurix Therapeutics
NRIX
$2.45B
| $44K | ﹤0.01% |
3,900
+3,700
| +1,850% | +$40K |
|
6047
Penske Automotive Group
PAG
$14.7B
| $44K | ﹤0.01% |
260
-107
| -29% | -$17.2K |
|
|
PKST
6048
PUT
DELISTED
Peakstone Realty Trust
PKST
| $44K | ﹤0.01% |
3,400
+1,000
| +42% | +$12.3K |
|
6049
PUT
Pilgrim's Pride
PPC
$7.13B
| $44K | ﹤0.01% |
1,000
-9,300
| -90% | -$456K |
|
6050
Shenandoah Telecom
SHEN
$678M
| $44K | ﹤0.01% |
3,235
+2,498
| +339% | +$31.7K |
|
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.