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 | |
|---|---|---|---|---|---|---|
3376
PUT
Polestar Automotive Holding UK
PSNY
$2.04B
| $564K | ﹤0.01% |
17,587
+10,944
| +165% | +$348K |
|
3377
Vanguard Information Technology ETF
VGT
$138B
| $564K | ﹤0.01% |
+6,808
| New | +$495K |
|
|
BIOA
3378
PUT
BioAge Labs
BIOA
$928M
| $564K | ﹤0.01% |
136,700
+15,800
| +13% | +$63.7K |
|
|
EXK
3379
PUT
Endeavour Silver
EXK
$2.35B
| $563K | ﹤0.01% |
114,500
+85,800
| +299% | +$338K |
|
3380
CALL
Under Armour Class C
UA
$2.95B
| $563K | ﹤0.01% |
83,000
-26,400
| -24% | -$156K |
|
3381
MarketAxess Holdings
MKTX
$4.19B
| $562K | ﹤0.01% |
2,519
-4,424
| -64% | -$972K |
|
3382
Cenovus Energy
CVE
$52.3B
| $561K | ﹤0.01% |
41,322
-163,387
| -80% | -$2.12M |
|
3383
PUT
DHT Holdings
DHT
$2.95B
| $561K | ﹤0.01% |
51,900
-34,600
| -40% | -$381K |
|
3384
PUT
Genius Sports
GENI
$1.94B
| $561K | ﹤0.01% |
54,000
+10,800
| +25% | +$108K |
|
3385
PUT
Liberty Global Class C
LBTYK
$3.27B
| $561K | ﹤0.01% |
56,100
+54,600
| +3,640% | +$565K |
|
3386
CALL
Progress Software
PRGS
$1.59B
| $561K | ﹤0.01% |
8,800
+8,600
| +4,300% | +$523K |
|
3387
PUT
TORM
TRMD
$3.05B
| $561K | ﹤0.01% |
33,700
+2,100
| +7% | +$35.1K |
|
3388
CALL
Aaon
AAON
$8.27B
| $560K | ﹤0.01% |
7,600
+6,600
| +660% | +$579K |
|
3389
Direxion Daily Homebuilders & Supplies Bull 3X ETF
NAIL
$598M
| $560K | ﹤0.01% |
10,584
-6,793
| -39% | -$350K |
|
3390
CALL
TAL Education Group
TAL
$5.86B
| $560K | ﹤0.01% |
54,800
-49,000
| -47% | -$506K |
|
3391
Deutsche Bank
DB
$67.9B
| $559K | ﹤0.01% |
+19,114
| New | +$505K |
|
3392
PUT
F5
FFIV
$23B
| $559K | ﹤0.01% |
1,900
-3,100
| -62% | -$856K |
|
3393
CALL
Eton Pharmaceutcials
ETON
$1.16B
| $558K | ﹤0.01% |
39,200
+34,400
| +717% | +$544K |
|
|
GLXY
3394
Galaxy Digital Inc
GLXY
$4.35B
| $557K | ﹤0.01% |
+25,445
| New | +$517K |
|
3395
PUT
Post Holdings
POST
$4.14B
| $556K | ﹤0.01% |
5,100
+1,600
| +46% | +$179K |
|
3396
PUT
Columbia Sportswear
COLM
$3.25B
| $555K | ﹤0.01% |
9,100
+8,400
| +1,200% | +$540K |
|
3397
CALL
East-West Bancorp
EWBC
$17.8B
| $555K | ﹤0.01% |
5,500
+3,100
| +129% | +$275K |
|
3398
Trip.com Group
TCOM
$28.2B
| $555K | ﹤0.01% |
9,477
-34,026
| -78% | -$2.04M |
|
3399
CALL
FormFactor
FORM
$7.7B
| $554K | ﹤0.01% |
16,100
-5,800
| -26% | -$176K |
|
3400
CALL
FLEX LNG
FLNG
$1.65B
| $553K | ﹤0.01% |
25,200
-9,300
| -27% | -$218K |
|
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.