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 | |
|---|---|---|---|---|---|---|
5051
PUT
Ascendis Pharma A/S
ASND
$16.5B
| $120K | ﹤0.01% |
700
-10,800
| -94% | -$1.76M |
|
5052
PUT
AudioCodes
AUDC
$235M
| $120K | ﹤0.01% |
12,300
+5,700
| +86% | +$52.2K |
|
5053
Bread Financial
BFH
$4.47B
| $120K | ﹤0.01% |
2,107
+2,061
| +4,480% | +$104K |
|
|
PRA
5054
PUT
DELISTED
ProAssurance
PRA
| $120K | ﹤0.01% |
5,300
+1,300
| +33% | +$30K |
|
5055
PUT
Sagimet Biosciences
SGMT
$451M
| $120K | ﹤0.01% |
15,800
+7,500
| +90% | +$31.7K |
|
5056
Teekay Tankers
TNK
$2.68B
| $120K | ﹤0.01% |
2,892
+1,222
| +73% | +$52.3K |
|
5057
iShares MSCI Turkey ETF
TUR
$198M
| $120K | ﹤0.01% |
3,726
-9,303
| -71% | -$292K |
|
5058
CALL
Blend Labs
BLND
$424M
| $119K | ﹤0.01% |
36,200
-18,800
| -34% | -$63.7K |
|
5059
Cardlytics
CDLX
$22.1M
| $119K | ﹤0.01% |
7,255
+3,018
| +71% | +$52.1K |
|
5060
CALL
Cincinnati Financial
CINF
$26.8B
| $119K | ﹤0.01% |
800
-900
| -53% | -$129K |
|
|
MAXN
5061
CALL
DELISTED
Maxeon Solar Technologies
MAXN
| $119K | ﹤0.01% |
38,900
-2,700
| -6% | -$8.4K |
|
5062
CALL
Patrick Industries
PATK
$2.79B
| $119K | ﹤0.01% |
+1,300
| New | +$111K |
|
5063
The RealReal
REAL
$1.44B
| $119K | ﹤0.01% |
25,035
+6,149
| +33% | +$33.8K |
|
5064
CALL
Upexi
UPXI
$59.5M
| $119K | ﹤0.01% |
+40,000
| New | +$346K |
|
5065
CALL
Caribou Biosciences
CRBU
$150M
| $118K | ﹤0.01% |
93,800
-20,600
| -18% | -$20.3K |
|
5066
CALL
California Resources
CRC
$4.53B
| $118K | ﹤0.01% |
2,600
-8,600
| -77% | -$352K |
|
5067
PUT
California Water Service
CWT
$3.02B
| $118K | ﹤0.01% |
2,600
+2,100
| +420% | +$100K |
|
5068
FingerMotion
FNGR
$14.5M
| $118K | ﹤0.01% |
+58,549
| New | +$144K |
|
5069
PUT
Genpact
G
$5.99B
| $118K | ﹤0.01% |
2,700
+500
| +23% | +$22.6K |
|
5070
CALL
Moelis & Co
MC
$5.08B
| $118K | ﹤0.01% |
1,900
+700
| +58% | +$39.3K |
|
5071
CALL
Oceaneering
OII
$4.74B
| $118K | ﹤0.01% |
5,700
| – | – |
|
5072
Paysafe
PSFE
$434M
| $118K | ﹤0.01% |
9,418
+1,888
| +25% | +$25.8K |
|
5073
PUT
Rogers Communications
RCI
$18.4B
| $118K | ﹤0.01% |
4,000
+2,000
| +100% | +$52.4K |
|
|
TERN
5074
CALL
DELISTED
Terns Pharmaceuticals
TERN
| $118K | ﹤0.01% |
31,700
-19,700
| -38% | -$61.5K |
|
5075
Biomea Fusion
BMEA
$88.2M
| $117K | ﹤0.01% |
+65,333
| New | +$126K |
|
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.