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 | |
|---|---|---|---|---|---|---|
|
BRY
5551
PUT
DELISTED
Berry Corp
BRY
| $72K | ﹤0.01% |
+26,200
| New | +$70K |
|
5552
Vanguard World Funds Extended Duration ETF
EDV
$3.21B
| $72K | ﹤0.01% |
1,082
-4,314
| -80% | -$285K |
|
5553
WisdomTree India Earnings Fund ETF
EPI
$2.06B
| $72K | ﹤0.01% |
1,524
-11,762
| -89% | -$534K |
|
5554
CALL
Essent Group
ESNT
$6.08B
| $72K | ﹤0.01% |
+1,200
| New | +$69.2K |
|
5555
PUT
Immunovant
IMVT
$7.86B
| $72K | ﹤0.01% |
4,500
-154,800
| -97% | -$2.34M |
|
5556
CALL
Manitowoc
MTW
$491M
| $72K | ﹤0.01% |
6,000
+5,800
| +2,900% | +$56.9K |
|
5557
CALL
Mueller Water Products
MWA
$3.95B
| $72K | ﹤0.01% |
3,000
-16,000
| -84% | -$396K |
|
|
PBPB
5558
PUT
DELISTED
Potbelly
PBPB
| $72K | ﹤0.01% |
5,900
-2,300
| -28% | -$22.6K |
|
5559
Red Robin
RRGB
$144M
| $72K | ﹤0.01% |
+12,572
| New | +$48.7K |
|
5560
PUT
Schrodinger
SDGR
$1.12B
| $72K | ﹤0.01% |
3,600
-800
| -18% | -$18.3K |
|
5561
CALL
Timken Company
TKR
$9.5B
| $72K | ﹤0.01% |
1,000
+400
| +67% | +$27.2K |
|
|
ONC
5562
CALL
BeOne Medicines Ltd
ONC
$32.5B
| $72K | ﹤0.01% |
+300
| New | +$73.6K |
|
5563
Andersons Inc
ANDE
$2.41B
| $71K | ﹤0.01% |
+1,947
| New | +$71.3K |
|
5564
Amplify Blockchain Technology ETF
BLOK
$1.07B
| $71K | ﹤0.01% |
+1,259
| New | +$57K |
|
5565
PUT
Compañía de Cervecerías Unidas
CCU
$2.12B
| $71K | ﹤0.01% |
+5,500
| New | +$78.3K |
|
5566
CALL
Cardlytics
CDLX
$21.8M
| $71K | ﹤0.01% |
4,360
+130
| +3% | +$2.25K |
|
5567
iShares MSCI Australia ETF
EWA
$1.39B
| $71K | ﹤0.01% |
+2,723
| New | +$67.9K |
|
|
FOLD
5568
PUT
DELISTED
Amicus Therapeutics
FOLD
| $71K | ﹤0.01% |
12,400
-14,300
| -54% | -$92.3K |
|
5569
PUT
Hamilton Insurance Group
HG
$3.54B
| $71K | ﹤0.01% |
3,300
+1,200
| +57% | +$24.2K |
|
5570
CALL
St. Joe Company
JOE
$3.52B
| $71K | ﹤0.01% |
1,500
-6,600
| -81% | -$295K |
|
5571
Lakeland Industries
LAKE
$112M
| $71K | ﹤0.01% |
5,231
+5,212
| +27,432% | +$87.3K |
|
5572
Reliance Steel & Aluminium
RS
$20.7B
| $71K | ﹤0.01% |
227
+165
| +266% | +$48.7K |
|
5573
SoundThinking
SSTI
$99.2M
| $71K | ﹤0.01% |
5,510
+3,952
| +254% | +$61.6K |
|
5574
CALL
Titan International
TWI
$471M
| $71K | ﹤0.01% |
7,000
-3,500
| -33% | -$27K |
|
5575
Vanguard US Momentum Factor ETF
VFMO
$1.77B
| $71K | ﹤0.01% |
412
+339
| +464% | +$53.5K |
|
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.