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 | |
|---|---|---|---|---|---|---|
|
LOGC
2476
PUT
DELISTED
ContextLogic
LOGC
| $1.35M | ﹤0.01% |
197,900
+80,500
| +69% | +$581K |
|
2477
Antero Resources
AR
$10.9B
| $1.35M | ﹤0.01% |
+33,426
| New | +$1.27M |
|
2478
CALL
ImmunityBio
IBRX
$7.44B
| $1.35M | ﹤0.01% |
510,200
+109,100
| +27% | +$293K |
|
2479
LifeMD
LFMD
$179M
| $1.35M | ﹤0.01% |
+98,884
| New | +$934K |
|
2480
PUT
Taylor Morrison
TMHC
| $1.34M | ﹤0.01% |
21,900
+21,200
| +3,029% | +$1.23M |
|
2481
PUT
Ambarella
AMBA
$2.99B
| $1.34M | ﹤0.01% |
20,300
-5,300
| -21% | -$281K |
|
2482
CALL
Factset
FDS
$9.05B
| $1.34M | ﹤0.01% |
+3,000
| New | +$1.31M |
|
2483
Ferrari
RACE
$63.3B
| $1.34M | ﹤0.01% |
+2,733
| New | +$1.27M |
|
2484
CALL
Bumble
BMBL
$367M
| $1.34M | ﹤0.01% |
203,400
+23,900
| +13% | +$121K |
|
2485
CALL
Children's Place
PLCE
$53.6M
| $1.34M | ﹤0.01% |
302,600
+145,900
| +93% | +$822K |
|
2486
PUT
Western Midstream Partners
WES
$19.6B
| $1.34M | ﹤0.01% |
34,600
-6,200
| -15% | -$236K |
|
2487
OneMain Financial
OMF
$6.9B
| $1.33M | ﹤0.01% |
23,408
-21,722
| -48% | -$1.08M |
|
2488
CALL
Varonis Systems
VRNS
$5.25B
| $1.33M | ﹤0.01% |
26,300
-8,300
| -24% | -$377K |
|
2489
Symbotic
SYM
$5.11B
| $1.33M | ﹤0.01% |
34,245
+9,617
| +39% | +$252K |
|
2490
PUT
Ouster
OUST
$2.29B
| $1.33M | ﹤0.01% |
54,800
+31,600
| +136% | +$384K |
|
2491
CALL
Corpay
CPAY
$24.2B
| $1.33M | ﹤0.01% |
4,000
+3,400
| +567% | +$1.11M |
|
2492
PUT
WillScot Mobile Mini Holdings
WSC
$4.8B
| $1.33M | ﹤0.01% |
48,400
-56,300
| -54% | -$1.5M |
|
2493
CALL
Ericsson
ERIC
$30.7B
| $1.32M | ﹤0.01% |
156,300
-139,600
| -47% | -$1.15M |
|
2494
Genius Sports
GENI
$1.73B
| $1.32M | ﹤0.01% |
127,438
+59,177
| +87% | +$591K |
|
|
GTM
2495
ZoomInfo Technologies
GTM
$861M
| $1.32M | ﹤0.01% |
130,993
-73,629
| -36% | -$681K |
|
2496
PUT
Altimmune
ALT
$539M
| $1.32M | ﹤0.01% |
341,800
+229,600
| +205% | +$1.24M |
|
2497
CALL
MannKind Corp
MNKD
$1.28B
| $1.32M | ﹤0.01% |
353,600
+123,700
| +54% | +$545K |
|
2498
Warby Parker
WRBY
$3.01B
| $1.32M | ﹤0.01% |
+60,289
| New | +$1.11M |
|
2499
CALL
Aon
AON
$77.3B
| $1.32M | ﹤0.01% |
3,700
-32,300
| -90% | -$11.7M |
|
2500
CALL
United States Brent Oil Fund
BNO
$815M
| $1.32M | ﹤0.01% |
45,100
+28,000
| +164% | +$789K |
|
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.