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 | |
|---|---|---|---|---|---|---|
|
XXRP
4201
Teucrium 2x Long Daily XRP ETF
XXRP
$88.4M
| $269K | ﹤0.01% |
+924
| New | +$289K |
|
4202
PUT
Global X S&P 500 Tail Risk ETF
XTR
$4.78M
| $268K | ﹤0.01% |
5,100
+1,100
| +28% | +$29.3K |
|
4203
CALL
Lifestance Health
LFST
$4.29B
| $267K | ﹤0.01% |
51,700
-153,200
| -75% | -$918K |
|
4204
CALL
NETGEAR
NTGR
$663M
| $267K | ﹤0.01% |
9,200
+7,300
| +384% | +$196K |
|
|
PNNT
4205
CALL
Pennant Park Investment Corp
PNNT
$221M
| $267K | ﹤0.01% |
39,100
+28,600
| +272% | +$189K |
|
4206
PUT
VEON
VEON
$3.57B
| $267K | ﹤0.01% |
5,800
-4,100
| -41% | -$189K |
|
4207
CALL
Delcath Systems
DCTH
$399M
| $266K | ﹤0.01% |
19,600
-9,600
| -33% | -$134K |
|
4208
PUT
Personalis
PSNL
$1.27B
| $266K | ﹤0.01% |
40,600
+32,600
| +408% | +$151K |
|
4209
CALL
Trex
TREX
$4.57B
| $266K | ﹤0.01% |
4,900
+1,300
| +36% | +$73.7K |
|
4210
Fastly Inc
FSLY
$3.26B
| $265K | ﹤0.01% |
37,557
-53,869
| -59% | -$361K |
|
4211
CALL
Viridian Therapeutics
VRDN
$2.15B
| $265K | ﹤0.01% |
19,000
-5,400
| -22% | -$73.3K |
|
4212
Global X Cybersecurity ETF
BUG
$1.26B
| $264K | ﹤0.01% |
7,131
+1,326
| +23% | +$45.5K |
|
4213
HUB Group
HUBG
$2.92B
| $264K | ﹤0.01% |
+7,921
| New | +$266K |
|
4214
PUT
Marten Transport
MRTN
$1.25B
| $264K | ﹤0.01% |
20,400
+7,600
| +59% | +$100K |
|
4215
CALL
Blue Bird Corp
BLBD
$2.34B
| $263K | ﹤0.01% |
6,100
-24,100
| -80% | -$918K |
|
4216
Expedia Group
EXPE
$35.5B
| $263K | ﹤0.01% |
+1,564
| New | +$254K |
|
|
LB
4217
PUT
LandBridge Co
LB
$2.09B
| $263K | ﹤0.01% |
3,900
+100
| +3% | +$7.21K |
|
4218
CALL
Coty
COTY
$2.45B
| $262K | ﹤0.01% |
56,500
+44,300
| +363% | +$219K |
|
4219
PUT
Lufax Holding
LU
$1.33B
| $262K | ﹤0.01% |
94,000
-7,500
| -7% | -$21.2K |
|
4220
Prothena Corp
PRTA
$448M
| $262K | ﹤0.01% |
+43,264
| New | +$325K |
|
4221
CALL
Tandem Diabetes Care
TNDM
$1.22B
| $262K | ﹤0.01% |
14,100
-50,800
| -78% | -$1.01M |
|
4222
CALL
American Coastal Insurance
ACIC
$526M
| $260K | ﹤0.01% |
23,400
-91,000
| -80% | -$1M |
|
4223
Brunswick
BC
$5.33B
| $260K | ﹤0.01% |
4,711
+2,025
| +75% | +$102K |
|
4224
CALL
Biomea Fusion
BMEA
$90.4M
| $260K | ﹤0.01% |
144,900
+117,900
| +437% | +$227K |
|
4225
CALL
Real Brokerage
REAX
$375M
| $260K | ﹤0.01% |
57,800
-8,500
| -13% | -$36.6K |
|
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.