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 | |
|---|---|---|---|---|---|---|
|
ETOR
2376
CALL
eToro Group
ETOR
$2.93B
| $1.5M | ﹤0.01% |
+22,500
| New | +$1.45M |
|
2377
PUT
Aflac
AFL
$63.9B
| $1.5M | ﹤0.01% |
14,200
-78,000
| -85% | -$8.2M |
|
2378
CALL
TFI International
TFII
$12.4B
| $1.5M | ﹤0.01% |
16,700
+15,900
| +1,988% | +$1.34M |
|
2379
UGI
UGI
$8B
| $1.5M | ﹤0.01% |
41,114
-4,928
| -11% | -$170K |
|
2380
PUT
Beam Therapeutics
BEAM
$2.58B
| $1.5M | ﹤0.01% |
88,000
+60,300
| +218% | +$1.05M |
|
2381
PUT
Vista Energy
VIST
$7.75B
| $1.5M | ﹤0.01% |
31,300
-17,800
| -36% | -$842K |
|
|
HBI
2382
CALL
DELISTED
Hanesbrands
HBI
| $1.5M | ﹤0.01% |
326,600
-38,500
| -11% | -$186K |
|
2383
PUT
Zions Bancorporation
ZION
$10.1B
| $1.5M | ﹤0.01% |
28,800
-48,300
| -63% | -$2.27M |
|
2384
PUT
InMode
INMD
$872M
| $1.49M | ﹤0.01% |
103,500
+5,900
| +6% | +$86.5K |
|
2385
First Horizon
FHN
$12.1B
| $1.49M | ﹤0.01% |
+70,462
| New | +$1.34M |
|
2386
CALL
Porch Group
PRCH
$1.3B
| $1.49M | ﹤0.01% |
126,500
+69,800
| +123% | +$600K |
|
2387
CALL
Mistras Group
MG
$492M
| $1.49M | ﹤0.01% |
185,800
-98,700
| -35% | -$830K |
|
|
TPC
2388
PUT
Tutor Perini Cor
TPC
$4.57B
| $1.49M | ﹤0.01% |
31,800
+1,800
| +6% | +$57.3K |
|
2389
Martin Marietta Materials
MLM
$33.6B
| $1.48M | ﹤0.01% |
2,703
-872
| -24% | -$461K |
|
2390
CALL
Innovative Industrial Properties
IIPR
$1.78B
| $1.47M | ﹤0.01% |
26,700
-19,000
| -42% | -$1.04M |
|
2391
Lowe's Companies
LOW
$116B
| $1.47M | ﹤0.01% |
+6,647
| New | +$1.48M |
|
2392
CALL
Planet Labs
PL
$7.3B
| $1.47M | ﹤0.01% |
241,700
+22,000
| +10% | +$89.8K |
|
|
PPL
2393
CALL
PPL Corp
PPL
$27.3B
| $1.47M | ﹤0.01% |
43,400
-76,400
| -64% | -$2.66M |
|
|
HSAI
2394
PUT
Hesai Group
HSAI
$2.29B
| $1.47M | ﹤0.01% |
66,800
-40,000
| -37% | -$704K |
|
2395
Birkenstock
BIRK
$7.47B
| $1.47M | ﹤0.01% |
29,807
+7,277
| +32% | +$374K |
|
2396
Banco Macro
BMA
$5.7B
| $1.46M | ﹤0.01% |
20,843
+18,863
| +953% | +$1.56M |
|
|
K
2397
PUT
DELISTED
Kellanova
K
| $1.46M | ﹤0.01% |
18,800
+8,400
| +81% | +$686K |
|
2398
Direxion Daily FTSE China Bear 3X ETF
YANG
$86.8M
| $1.46M | ﹤0.01% |
47,780
-116,859
| -71% | -$4.49M |
|
2399
CALL
Allegro MicroSystems
ALGM
$8.58B
| $1.46M | ﹤0.01% |
42,700
+27,200
| +175% | +$678K |
|
2400
PUT
Century Aluminum
CENX
$4.57B
| $1.46M | ﹤0.01% |
81,000
+50,400
| +165% | +$856K |
|
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.