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 | |
|---|---|---|---|---|---|---|
4501
PUT
MillerKnoll
MLKN
$1.56B
| $201K | ﹤0.01% |
10,400
-9,000
| -46% | -$153K |
|
4502
CALL
nCino
NCNO
$2.06B
| $201K | ﹤0.01% |
7,200
-45,800
| -86% | -$1.14M |
|
4503
CALL
Ormat Technologies
ORA
$5.8B
| $201K | ﹤0.01% |
2,400
-200
| -8% | -$15K |
|
4504
PUT
Peoples Bancorp
PEBO
$1.51B
| $201K | ﹤0.01% |
6,600
+500
| +8% | +$14.6K |
|
4505
Baytex Energy
BTE
$2.96B
| $200K | ﹤0.01% |
112,003
+28,277
| +34% | +$49.5K |
|
|
NVEE
4506
DELISTED
NV5 Global
NVEE
| $200K | ﹤0.01% |
8,703
-51,901
| -86% | -$1.04M |
|
4507
PUT
Grupo Aeroportuario Centro Norte
OMAB
$5.14B
| $200K | ﹤0.01% |
1,900
+700
| +58% | +$65.7K |
|
4508
RenaissanceRe
RNR
$13.8B
| $200K | ﹤0.01% |
+824
| New | +$200K |
|
4509
Televisa
TV
$1.49B
| $200K | ﹤0.01% |
91,661
-41,557
| -31% | -$81.4K |
|
|
UCTT
4510
Ultra Clean Holdings
UCTT
$3.12B
| $200K | ﹤0.01% |
8,889
-1,372
| -13% | -$28.2K |
|
4511
PUT
Vanguard Total International Stock ETF
VXUS
$151B
| $200K | ﹤0.01% |
2,900
+1,200
| +71% | +$77.9K |
|
4512
PUT
Brookfield Infrastructure
BIPC
$5.32B
| $199K | ﹤0.01% |
4,800
+800
| +20% | +$30.8K |
|
4513
CALL
Cooper-Standard Automotive
CPS
$517M
| $199K | ﹤0.01% |
9,300
+900
| +11% | +$17.3K |
|
4514
Solid Power
SLDP
$450M
| $199K | ﹤0.01% |
91,130
+62,853
| +222% | +$88.3K |
|
|
AL
4515
CALL
DELISTED
Air Lease Corp
AL
| $198K | ﹤0.01% |
3,400
-1,600
| -32% | -$83.3K |
|
4516
CALL
Ardelyx
ARDX
$1.24B
| $198K | ﹤0.01% |
50,600
-38,100
| -43% | -$157K |
|
4517
BuzzFeed
BZFD
$99M
| $198K | ﹤0.01% |
99,000
+45,238
| +84% | +$89.3K |
|
4518
International Paper
IP
$22.6B
| $198K | ﹤0.01% |
+4,232
| New | +$200K |
|
4519
TXO Partners LP
TXO
$724M
| $198K | ﹤0.01% |
+13,192
| New | +$213K |
|
|
AHRT
4520
PUT
AH Realty Trust
AHRT
$536M
| $197K | ﹤0.01% |
28,700
-26,700
| -48% | -$185K |
|
4521
CALL
InfraCap MLP ETF
AMZA
$466M
| $197K | ﹤0.01% |
9,200
+5,100
| +124% | +$217K |
|
4522
Gevo
GEVO
$353M
| $197K | ﹤0.01% |
149,533
+143,897
| +2,553% | +$169K |
|
4523
PUT
Playtika
PLTK
$1.53B
| $197K | ﹤0.01% |
41,800
+10,900
| +35% | +$53.6K |
|
4524
Sun Communities
SUI
$15.8B
| $197K | ﹤0.01% |
1,560
+1,050
| +206% | +$130K |
|
|
CRESY
4525
Cresud
CRESY
$806M
| $196K | ﹤0.01% |
18,458
-631
| -3% | -$7.04K |
|
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.