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 | |
|---|---|---|---|---|---|---|
2426
CALL
AbCellera Biologics
ABCL
$1.62B
| $1.42M | ﹤0.01% |
414,800
+317,200
| +325% | +$790K |
|
2427
PUT
Sharplink Inc
SBET
$1.22B
| $1.42M | ﹤0.01% |
+142,900
| New | +$1.94M |
|
|
SFD
2428
CALL
Smithfield Foods
SFD
$10.3B
| $1.42M | ﹤0.01% |
+60,300
| New | +$1.33M |
|
2429
CALL
AvePoint
AVPT
$2.6B
| $1.42M | ﹤0.01% |
73,400
-30,900
| -30% | -$536K |
|
2430
Rapid7
RPD
$634M
| $1.42M | ﹤0.01% |
61,186
+7,468
| +14% | +$177K |
|
2431
PUT
Argan
AGX
$7.98B
| $1.41M | ﹤0.01% |
6,400
-9,900
| -61% | -$1.78M |
|
2432
CALL
Byrna Technologies
BYRN
$80.3M
| $1.41M | ﹤0.01% |
45,700
+9,800
| +27% | +$239K |
|
2433
State Street Consumer Staples Select Sector SPDR ETF
XLP
$14.2B
| $1.41M | ﹤0.01% |
17,435
-70,908
| -80% | -$5.75M |
|
|
VSXY
2434
Victoria's Secret
VSXY
$6.64B
| $1.41M | ﹤0.01% |
76,025
+65,450
| +619% | +$1.28M |
|
|
CIM
2435
PUT
Chimera Investment
CIM
$1.05B
| $1.41M | ﹤0.01% |
101,400
+11,200
| +12% | +$143K |
|
2436
CALL
Kodiak Gas Services
KGS
$5.96B
| $1.41M | ﹤0.01% |
41,000
+24,100
| +143% | +$834K |
|
2437
CALL
Texas Roadhouse
TXRH
$12.7B
| $1.41M | ﹤0.01% |
7,500
-12,000
| -62% | -$2.15M |
|
2438
PUT
ASP Isotopes
ASPI
$487M
| $1.4M | ﹤0.01% |
190,600
+109,700
| +136% | +$736K |
|
2439
CALL
CorMedix
CRMD
$617M
| $1.4M | ﹤0.01% |
113,700
-99,600
| -47% | -$1.1M |
|
2440
PUT
Donaldson
DCI
$10.8B
| $1.4M | ﹤0.01% |
20,200
+15,200
| +304% | +$1.02M |
|
2441
iShares MSCI United Kingdom ETF
EWU
$4.04B
| $1.4M | ﹤0.01% |
35,269
+31,913
| +951% | +$1.23M |
|
2442
T-Rex 2X Long NVIDIA Daily Target ETF
NVDX
$461M
| $1.4M | ﹤0.01% |
96,103
+72,962
| +315% | +$710K |
|
2443
CALL
iQIYI
IQ
$1.18B
| $1.4M | ﹤0.01% |
790,900
+140,600
| +22% | +$253K |
|
|
EXK
2444
CALL
Endeavour Silver
EXK
$2.32B
| $1.4M | ﹤0.01% |
284,100
-136,500
| -32% | -$538K |
|
2445
CALL
Clover Health Investments
CLOV
$2.28B
| $1.39M | ﹤0.01% |
499,600
-295,000
| -37% | -$970K |
|
2446
ThredUp
TDUP
$736M
| $1.39M | ﹤0.01% |
186,107
+179,715
| +2,812% | +$1.06M |
|
2447
Axsome Therapeutics
AXSM
$12.4B
| $1.39M | ﹤0.01% |
+13,319
| New | +$1.41M |
|
2448
VF Corp
VFC
$6.68B
| $1.39M | ﹤0.01% |
118,372
+109,470
| +1,230% | +$1.36M |
|
|
JOYY
2449
PUT
JOYY Inc
JOYY
$3.73B
| $1.38M | ﹤0.01% |
27,200
+19,900
| +273% | +$883K |
|
2450
BHP
BHP
$213B
| $1.38M | ﹤0.01% |
28,691
-3,937
| -12% | -$189K |
|
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.