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 | |
|---|---|---|---|---|---|---|
6501
VanEck Preferred Securities ex Financials ETF
PFXF
$2.37B
| $27K | ﹤0.01% |
1,597
+787
| +97% | +$13.1K |
|
6502
CALL
Pulse Biosciences
PLSE
$2.37B
| $27K | ﹤0.01% |
1,800
-900
| -33% | -$14.9K |
|
6503
Primerica
PRI
$10.1B
| $27K | ﹤0.01% |
+99
| New | +$26.2K |
|
|
6504
PUT
Primerica
PRI
$10.1B
| $27K | ﹤0.01% |
100
| – | – |
|
|
RPC
6505
PUT
Ridgepost Capital
RPC
$926M
| $27K | ﹤0.01% |
2,700
+1,600
| +145% | +$17.1K |
|
6506
Ryman Hospitality Properties
RHP
$8.56B
| $27K | ﹤0.01% |
+283
| New | +$26.5K |
|
6507
Direxion Daily S&P 500 Bear 1X ETF
SPDN
$226M
| $27K | ﹤0.01% |
2,635
+1,535
| +140% | +$17.3K |
|
6508
CALL
Sprout Social
SPT
$530M
| $27K | ﹤0.01% |
1,300
-4,100
| -76% | -$86.9K |
|
|
SRG
6509
PUT
Seritage Growth Properties
SRG
$138M
| $27K | ﹤0.01% |
8,800
+100
| +1% | +$288 |
|
|
STR
6510
DELISTED
Sitio Royalties
STR
| $27K | ﹤0.01% |
+1,489
| New | +$26.7K |
|
6511
Trupanion
TRUP
$1.13B
| $27K | ﹤0.01% |
+498
| New | +$22.1K |
|
6512
CALL
VEON
VEON
$3.5B
| $27K | ﹤0.01% |
600
-900
| -60% | -$41.4K |
|
6513
VOC Energy
VOC
$56.4M
| $27K | ﹤0.01% |
9,724
+5,894
| +154% | +$17.4K |
|
6514
CALL
Workiva
WK
$3.45B
| $27K | ﹤0.01% |
400
-300
| -43% | -$20.6K |
|
|
XNET
6515
CALL
Xunlei
XNET
$333M
| $27K | ﹤0.01% |
6,700
-18,900
| -74% | -$87.5K |
|
6516
CALL
ZipRecruiter
ZIP
$339M
| $27K | ﹤0.01% |
5,400
+3,300
| +157% | +$18K |
|
6517
GraniteShares 2x Long AAPL Daily ETF
AAPB
$20.1M
| $26K | ﹤0.01% |
+1,298
| New | +$25.9K |
|
6518
CALL
Assured Guaranty
AGO
$3.73B
| $26K | ﹤0.01% |
300
-9,200
| -97% | -$784K |
|
6519
CALL
ALX Oncology
ALXO
$262M
| $26K | ﹤0.01% |
63,600
+59,900
| +1,619% | +$30.2K |
|
6520
CALL
ANI Pharmaceuticals
ANIP
$1.86B
| $26K | ﹤0.01% |
400
-200
| -33% | -$13K |
|
6521
CALL
Boise Cascade
BCC
$2.73B
| $26K | ﹤0.01% |
300
-1,000
| -77% | -$90.7K |
|
|
6522
PUT
Boise Cascade
BCC
$2.73B
| $26K | ﹤0.01% |
+300
| New | +$27.2K |
|
6523
Compañía de Cervecerías Unidas
CCU
$2.14B
| $26K | ﹤0.01% |
+2,022
| New | +$28.8K |
|
6524
Caesarstone
CSTE
$69.5M
| $26K | ﹤0.01% |
+13,634
| New | +$30.8K |
|
6525
PUT
Dimensional US Core Equity Market ETF
DFAU
$12.1B
| $26K | ﹤0.01% |
1,000
+700
| +233% | +$27.4K |
|
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.