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 | |
|---|---|---|---|---|---|---|
2276
PUT
Boyd Gaming
BYD
$6.47B
| $1.66M | ﹤0.01% |
21,200
| – | – |
|
2277
PUT
Mid-America Apartment Communities
MAA
$15.6B
| $1.66M | ﹤0.01% |
11,200
+3,300
| +42% | +$515K |
|
2278
CALL
Organon & Co
OGN
$3.55B
| $1.66M | ﹤0.01% |
171,100
+51,000
| +42% | +$526K |
|
2279
CALL
Travere Therapeutics
TVTX
$5.33B
| $1.66M | ﹤0.01% |
111,900
+30,500
| +37% | +$506K |
|
2280
Eastman Chemical
EMN
$7.8B
| $1.65M | ﹤0.01% |
22,108
-43,770
| -66% | -$3.44M |
|
2281
PUT
Restaurant Brands International
QSR
$25.1B
| $1.65M | ﹤0.01% |
24,900
-32,700
| -57% | -$2.18M |
|
2282
Polaris
PII
$4.15B
| $1.65M | ﹤0.01% |
+40,574
| New | +$1.53M |
|
|
LOGC
2283
CALL
DELISTED
ContextLogic
LOGC
| $1.65M | ﹤0.01% |
242,000
+106,700
| +79% | +$771K |
|
2284
PUT
Eversource Energy
ES
$28.2B
| $1.65M | ﹤0.01% |
25,900
+22,000
| +564% | +$1.36M |
|
2285
Domo
DOMO
$166M
| $1.64M | ﹤0.01% |
+117,638
| New | +$1.18M |
|
2286
CALL
Jack Henry & Associates
JKHY
$10.7B
| $1.64M | ﹤0.01% |
9,100
| – | – |
|
2287
PUT
abrdn Physical Palladium Shares ETF
PALL
$603M
| $1.64M | ﹤0.01% |
81,500
+71,000
| +676% | +$1.28M |
|
|
FL
2288
CALL
DELISTED
Foot Locker
FL
| $1.63M | ﹤0.01% |
66,700
-104,700
| -61% | -$1.9M |
|
2289
CALL
Aurinia Pharmaceuticals
AUPH
$1.97B
| $1.63M | ﹤0.01% |
192,900
-31,100
| -14% | -$249K |
|
2290
CALL
JFrog
FROG
$9.71B
| $1.63M | ﹤0.01% |
37,200
-4,000
| -10% | -$152K |
|
2291
PUT
Calumet Specialty Products
CLMT
$3.63B
| $1.63M | ﹤0.01% |
103,500
+51,400
| +99% | +$654K |
|
2292
Range Resources
RRC
$9.11B
| $1.63M | ﹤0.01% |
40,003
-81,612
| -67% | -$3.08M |
|
2293
CALL
Aecom
ACM
$9.07B
| $1.63M | ﹤0.01% |
14,400
-8,200
| -36% | -$851K |
|
2294
PUT
EPR Properties
EPR
$4.86B
| $1.63M | ﹤0.01% |
27,900
-21,200
| -43% | -$1.12M |
|
2295
CALL
Urban Outfitters
URBN
$5.99B
| $1.62M | ﹤0.01% |
22,400
+4,500
| +25% | +$270K |
|
|
KNGS
2296
CALL
DELISTED
Roundhill S&P Dividend Monarchs ETF
KNGS
| $1.62M | ﹤0.01% |
41,600
+10,900
| +36% | +$425K |
|
2297
Burford Capital
BUR
$907M
| $1.62M | ﹤0.01% |
113,807
+83,746
| +279% | +$1.09M |
|
2298
PUT
American Eagle Outfitters
AEO
$2.85B
| $1.62M | ﹤0.01% |
168,400
-176,000
| -51% | -$1.89M |
|
|
CHGX
2299
CALL
DELISTED
AXS Change Finance ESG ETF
CHGX
| $1.62M | ﹤0.01% |
86,700
+54,500
| +169% | +$1.95M |
|
2300
CALL
Halozyme
HALO
$9.72B
| $1.61M | ﹤0.01% |
31,000
+8,900
| +40% | +$506K |
|
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.