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 | |
|---|---|---|---|---|---|---|
6401
PUT
Payoneer
PAYO
$2.41B
| $30K | ﹤0.01% |
4,500
-2,000
| -31% | -$13.6K |
|
|
PINC
6402
CALL
DELISTED
Premier
PINC
| $30K | ﹤0.01% |
1,400
+900
| +180% | +$19.4K |
|
6403
CALL
Playboy Inc
PLBY
$136M
| $30K | ﹤0.01% |
18,800
+14,800
| +370% | +$19K |
|
6404
CALL
Rani Therapeutics
RANI
$94.8M
| $30K | ﹤0.01% |
58,900
-100
| -0.2% | -$82 |
|
6405
Real Brokerage
REAX
$360M
| $30K | ﹤0.01% |
6,807
-5,958
| -47% | -$25.6K |
|
6406
CALL
Rackspace Technology
RXT
$960M
| $30K | ﹤0.01% |
23,700
+18,200
| +331% | +$23.7K |
|
6407
PUT
ProShares UltraShort Industrials
SIJ
$6.11M
| $30K | ﹤0.01% |
150
+125
| +500% | +$3.8K |
|
6408
PUT
Star Holdings Shares of Beneficial Interest
STHO
$112M
| $30K | ﹤0.01% |
+3,900
| New | +$27K |
|
6409
CALL
Tredegar Corp
TG
$260M
| $30K | ﹤0.01% |
3,500
+3,200
| +1,067% | +$25.8K |
|
6410
United Microelectronic
UMC
$42.9B
| $30K | ﹤0.01% |
4,038
-8,702
| -68% | -$64.6K |
|
6411
PUT
Valvoline
VVV
$5.06B
| $30K | ﹤0.01% |
+800
| New | +$28K |
|
6412
W&T Offshore
WTI
$525M
| $30K | ﹤0.01% |
18,637
-56,542
| -75% | -$83.4K |
|
6413
PUT
Xometry
XMTR
$4.47B
| $30K | ﹤0.01% |
900
-1,000
| -53% | -$29.3K |
|
6414
CALL
BBB Foods
TBBB
$4.76B
| $30K | ﹤0.01% |
1,100
+200
| +22% | +$5.63K |
|
|
RDTL
6415
GraniteShares 2x Long RDDT Daily ETF
RDTL
$44.7M
| $30K | ﹤0.01% |
+1,065
| New | +$18.8K |
|
6416
PUT
Aaon
AAON
$6.95B
| $29K | ﹤0.01% |
400
-17,400
| -98% | -$1.53M |
|
|
AVDX
6417
DELISTED
AvidXchange
AVDX
| $29K | ﹤0.01% |
3,000
-89,530
| -97% | -$807K |
|
6418
PUT
Acuity Brands
AYI
$9.99B
| $29K | ﹤0.01% |
100
| – | – |
|
|
BANX
6419
CALL
ArrowMark Financial
BANX
$195M
| $29K | ﹤0.01% |
+1,400
| New | +$28.2K |
|
6420
CoinShares ETF Trust CoinShares Bitcoin and Ether ETF
BTF
$13.8M
| $29K | ﹤0.01% |
452
+350
| +343% | +$20.7K |
|
6421
PUT
BrightView Holdings
BV
$1.24B
| $29K | ﹤0.01% |
1,800
+1,400
| +350% | +$20.9K |
|
6422
Crescent Capital BDC
CCAP
$405M
| $29K | ﹤0.01% |
2,122
+2,071
| +4,061% | +$31.8K |
|
6423
PUT
Compugen
CGEN
$212M
| $29K | ﹤0.01% |
16,500
-59,800
| -78% | -$88.7K |
|
6424
CALL
Element Solutions
ESI
$8.48B
| $29K | ﹤0.01% |
1,300
-8,600
| -87% | -$180K |
|
6425
CALL
Funko
FNKO
$346M
| $29K | ﹤0.01% |
6,200
+1,500
| +32% | +$6.84K |
|
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.