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 | |
|---|---|---|---|---|---|---|
5576
CALL
Voya Financial
VOYA
$9.11B
| $71K | ﹤0.01% |
1,000
+300
| +43% | +$19.3K |
|
|
MTSR
5577
CALL
DELISTED
Metsera Inc
MTSR
| $71K | ﹤0.01% |
+2,500
| New | +$62.1K |
|
5578
PUT
Brookfield Infrastructure Partners
BIP
$19.1B
| $70K | ﹤0.01% |
2,100
-20,300
| -91% | -$637K |
|
5579
PUT
Certara
CERT
$1.22B
| $70K | ﹤0.01% |
6,000
+800
| +15% | +$9.46K |
|
5580
PUT
La-Z-Boy
LZB
$1.59B
| $70K | ﹤0.01% |
1,900
-1,300
| -41% | -$52K |
|
5581
CALL
NBT Bancorp
NBTB
$2.76B
| $70K | ﹤0.01% |
+1,700
| New | +$70.8K |
|
5582
CALL
Resideo Technologies
REZI
$5.26B
| $70K | ﹤0.01% |
3,200
-300
| -9% | -$5.72K |
|
5583
PUT
Worthington Enterprises
WOR
$2.76B
| $70K | ﹤0.01% |
1,100
-900
| -45% | -$49.9K |
|
|
QBTX
5584
Tradr 2X Long QBTS Daily ETF
QBTX
$75.8M
| $70K | ﹤0.01% |
+3,054
| New | +$71.2K |
|
5585
PUT
A10 Networks
ATEN
$2.21B
| $69K | ﹤0.01% |
3,600
+1,800
| +100% | +$30.8K |
|
5586
CALL
A2Z Smart Technologies
AZ
$257M
| $69K | ﹤0.01% |
6,600
+5,600
| +560% | +$47.9K |
|
5587
CALL
Belden
BDC
$4.63B
| $69K | ﹤0.01% |
600
+100
| +20% | +$10.5K |
|
5588
PUT
BGC Group
BGC
$5.56B
| $69K | ﹤0.01% |
6,800
-200
| -3% | -$1.84K |
|
5589
Carriage Services
CSV
$642M
| $69K | ﹤0.01% |
1,526
+1,226
| +409% | +$51.2K |
|
|
DNB
5590
CALL
DELISTED
Dun & Bradstreet
DNB
| $69K | ﹤0.01% |
7,600
-190,600
| -96% | -$1.71M |
|
5591
Gentex
GNTX
$4.99B
| $69K | ﹤0.01% |
3,158
-14,134
| -82% | -$309K |
|
|
HOUS
5592
PUT
DELISTED
Anywhere Real Estate
HOUS
| $69K | ﹤0.01% |
19,300
-35,300
| -65% | -$123K |
|
5593
CALL
Ingles Markets
IMKTA
$1.69B
| $69K | ﹤0.01% |
1,100
-500
| -31% | -$31.1K |
|
5594
Odyssey Marine Exploration
OMEX
$37.8M
| $69K | ﹤0.01% |
+58,477
| New | +$53.3K |
|
5595
PUT
PAR Technology
PAR
$717M
| $69K | ﹤0.01% |
1,000
-3,500
| -78% | -$219K |
|
5596
CALL
Bristow Group
VTOL
$1.32B
| $69K | ﹤0.01% |
2,100
+2,000
| +2,000% | +$60.3K |
|
|
YALA
5597
PUT
Yalla Group
YALA
$815M
| $69K | ﹤0.01% |
10,300
-25,200
| -71% | -$171K |
|
|
TSMU
5598
GraniteShares 2x Long TSM Daily ETF
TSMU
$61.7M
| $69K | ﹤0.01% |
2,511
+2,346
| +1,422% | +$45K |
|
|
VFLQ
5599
PUT
DELISTED
Vanguard U.S. Liquidity Factor ETF
VFLQ
| $69K | ﹤0.01% |
400
-200
| -33% | -$34.5K |
|
|
ABX
5600
PUT
Abacus Global Management
ABX
$1.01B
| $68K | ﹤0.01% |
13,300
-1,100
| -8% | -$8.13K |
|
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.