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 | |
|---|---|---|---|---|---|---|
6576
PUT
Lakeland Industries
LAKE
$104M
| $25K | ﹤0.01% |
+1,900
| New | +$31.8K |
|
6577
Lightwave Logic
LWLG
$849M
| $25K | ﹤0.01% |
20,836
-4,427
| -18% | -$4.65K |
|
6578
PUT
Lloyds Banking Group
LYG
$85.6B
| $25K | ﹤0.01% |
6,000
-46,100
| -88% | -$183K |
|
6579
Neurogene
NGNE
$648M
| $25K | ﹤0.01% |
1,711
+866
| +102% | +$13.6K |
|
|
NOTE
6580
DELISTED
FiscalNote
NOTE
| $25K | ﹤0.01% |
3,989
+2,299
| +136% | +$17.2K |
|
6581
OraSure Technologies
OSUR
$271M
| $25K | ﹤0.01% |
8,610
-8,012
| -48% | -$23.1K |
|
|
PDM
6582
Piedmont Realty Trust
PDM
$1.25B
| $25K | ﹤0.01% |
3,481
+2,961
| +569% | +$20.5K |
|
6583
Perion Network
PERI
$378M
| $25K | ﹤0.01% |
2,529
-78,374
| -97% | -$749K |
|
6584
Direxion NASDAQ-100 Equal Weighted Index ETF
QQQE
$1.33B
| $25K | ﹤0.01% |
+256
| New | +$23.2K |
|
6585
PUT
Riskified
RSKD
$725M
| $25K | ﹤0.01% |
5,200
+2,100
| +68% | +$10K |
|
6586
iShares MSCI Japan Small-Cap ETF
SCJ
$248M
| $25K | ﹤0.01% |
297
+190
| +178% | +$15.2K |
|
|
SCS
6587
CALL
DELISTED
Steelcase
SCS
| $25K | ﹤0.01% |
2,400
-5,100
| -68% | -$52.5K |
|
6588
CALL
Sutro Biopharma
STRO
$384M
| $25K | ﹤0.01% |
3,620
+300
| +9% | +$2.45K |
|
|
TEF
6589
CALL
DELISTED
Telefonica
TEF
| $25K | ﹤0.01% |
+4,900
| New | +$24.6K |
|
6590
UNIFI
UFI
$114M
| $25K | ﹤0.01% |
4,969
+4,836
| +3,636% | +$23.8K |
|
6591
PUT
Village Farms International
VFF
$242M
| $25K | ﹤0.01% |
+23,600
| New | +$20.9K |
|
|
VLRS
6592
Controladora Vuela Compania de Aviacion
VLRS
$882M
| $25K | ﹤0.01% |
5,282
-1,804
| -25% | -$8.08K |
|
|
YSG
6593
PUT
Yatsen Holding
YSG
$318M
| $25K | ﹤0.01% |
+2,600
| New | +$14.9K |
|
|
ABX
6594
CALL
Abacus Global Management
ABX
$1B
| $24K | ﹤0.01% |
4,700
+2,400
| +104% | +$17.7K |
|
6595
Adtran
ADTN
$684M
| $24K | ﹤0.01% |
+2,709
| New | +$21.6K |
|
6596
AXT Inc
AXTI
$2.56B
| $24K | ﹤0.01% |
11,929
-12,573
| -51% | -$19.5K |
|
|
BRY
6597
CALL
DELISTED
Berry Corp
BRY
| $24K | ﹤0.01% |
8,900
-1,800
| -17% | -$4.81K |
|
6598
Calix
CALX
$2.26B
| $24K | ﹤0.01% |
+455
| New | +$19.5K |
|
|
CHCT
6599
CALL
Community Healthcare Trust
CHCT
$541M
| $24K | ﹤0.01% |
1,500
-200
| -12% | -$3.3K |
|
6600
Ducommun
DCO
$2.58B
| $24K | ﹤0.01% |
291
-14
| -5% | -$930 |
|
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.