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 | |
|---|---|---|---|---|---|---|
4251
Tilray
TLRY
$481M
| $254K | ﹤0.01% |
61,550
-49,309
| -44% | -$224K |
|
4252
CALL
AppFolio
APPF
$6.68B
| $253K | ﹤0.01% |
1,100
-900
| -45% | -$196K |
|
|
ETNB
4253
PUT
DELISTED
89bio
ETNB
| $253K | ﹤0.01% |
25,800
+11,700
| +83% | +$96.9K |
|
4254
PUT
GoPro
GPRO
$120M
| $253K | ﹤0.01% |
334,500
+107,500
| +47% | +$69.9K |
|
4255
Clean Energy Fuels
CLNE
$416M
| $252K | ﹤0.01% |
129,474
+94,479
| +270% | +$161K |
|
4256
PUT
LKQ Corp
LKQ
$6.76B
| $251K | ﹤0.01% |
6,800
-10,400
| -60% | -$415K |
|
4257
PUT
Methanex
MEOH
$4.08B
| $251K | ﹤0.01% |
7,600
+6,300
| +485% | +$203K |
|
|
MRSH
4258
Marsh
MRSH
$94.2B
| $251K | ﹤0.01% |
+1,152
| New | +$260K |
|
4259
ProShares UltraShort Real Estate
SRS
$14.9M
| $251K | ﹤0.01% |
5,267
+1,107
| +27% | +$54.9K |
|
|
TUYA
4260
Tuya Inc
TUYA
$1.05B
| $251K | ﹤0.01% |
109,035
-120,990
| -53% | -$294K |
|
4261
PUT
UWM Holdings
UWMC
$672M
| $251K | ﹤0.01% |
60,700
+13,100
| +28% | +$57.6K |
|
4262
PUT
Visteon
VC
$2.84B
| $251K | ﹤0.01% |
2,700
-1,400
| -34% | -$115K |
|
|
SOBO
4263
South Bow Corp
SOBO
$7.8B
| $251K | ﹤0.01% |
9,717
+6,407
| +194% | +$163K |
|
4264
PUT
Absci
ABSI
$1.15B
| $250K | ﹤0.01% |
97,400
-52,100
| -35% | -$147K |
|
4265
PUT
Infosys
INFY
$50.6B
| $250K | ﹤0.01% |
13,500
-85,400
| -86% | -$1.53M |
|
4266
CALL
Methode Electronics
MEI
$470M
| $250K | ﹤0.01% |
26,300
-40,200
| -60% | -$295K |
|
4267
CALL
Prudential
PUK
$36.4B
| $250K | ﹤0.01% |
10,000
+9,400
| +1,567% | +$210K |
|
4268
CALL
ESCO Technologies
ESE
$7.78B
| $249K | ﹤0.01% |
+1,300
| New | +$222K |
|
|
ASA
4269
ASA Gold and Precious Metals
ASA
$916M
| $248K | ﹤0.01% |
+7,868
| New | +$240K |
|
4270
Harrow
HROW
$1.45B
| $248K | ﹤0.01% |
8,121
-25,659
| -76% | -$689K |
|
4271
Monolithic Power Systems
MPWR
$61.7B
| $248K | ﹤0.01% |
340
-811
| -70% | -$517K |
|
|
SEPN
4272
Septerna Inc
SEPN
$1.51B
| $248K | ﹤0.01% |
23,525
+23,495
| +78,317% | +$193K |
|
4273
CALL
AerSale
ASLE
$295M
| $247K | ﹤0.01% |
41,200
-17,300
| -30% | -$111K |
|
4274
CALL
Bloomin' Brands
BLMN
$751M
| $247K | ﹤0.01% |
28,700
+14,800
| +106% | +$119K |
|
4275
PUT
Evolent Health
EVH
$385M
| $247K | ﹤0.01% |
22,000
+20,200
| +1,122% | +$186K |
|
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.