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 | |
|---|---|---|---|---|---|---|
2301
PUT
Manitowoc
MTW
$516M
| $1.61M | ﹤0.01% |
+134,000
| New | +$1.31M |
|
2302
PUT
New Fortress Energy
NFE
$101M
| $1.61M | ﹤0.01% |
485,200
+155,900
| +47% | +$677K |
|
2303
CALL
Nabors Industries
NBR
$1.23B
| $1.61M | ﹤0.01% |
57,400
+39,300
| +217% | +$1.17M |
|
2304
CALL
Teradata
TDC
$2.68B
| $1.61M | ﹤0.01% |
72,100
+3,400
| +5% | +$74K |
|
2305
CALL
Antero Midstream
AM
$10.8B
| $1.61M | ﹤0.01% |
84,800
-26,900
| -24% | -$481K |
|
2306
Schneider National
SNDR
$6.59B
| $1.6M | ﹤0.01% |
66,491
+46,939
| +240% | +$1.09M |
|
2307
CALL
Incyte
INCY
$23.5B
| $1.6M | ﹤0.01% |
23,500
-74,300
| -76% | -$4.71M |
|
2308
PUT
Velocity Financial
VEL
$683M
| $1.6M | ﹤0.01% |
86,100
-10,000
| -10% | -$175K |
|
|
CNH
2309
PUT
CNH Industrial
CNH
$13.8B
| $1.59M | ﹤0.01% |
122,600
-33,400
| -21% | -$413K |
|
2310
CALL
Globus Medical
GMED
$10.4B
| $1.59M | ﹤0.01% |
26,900
+22,900
| +573% | +$1.48M |
|
2311
PUT
Sprott Uranium Miners ETF
URNM
$1.78B
| $1.59M | ﹤0.01% |
+33,600
| New | +$1.27M |
|
|
ROBN
2312
T-Rex 2X Long HOOD Daily Target ETF
ROBN
$91.2M
| $1.59M | ﹤0.01% |
30,331
+15,548
| +105% | +$364K |
|
2313
PUT
Invesco CurrencyShares Japanese Yen Trust
FXY
$423M
| $1.58M | ﹤0.01% |
24,800
-18,600
| -43% | -$1.19M |
|
2314
CALL
MarketAxess Holdings
MKTX
$4.15B
| $1.58M | ﹤0.01% |
7,100
-16,500
| -70% | -$3.63M |
|
2315
PUT
Navient
NAVI
$774M
| $1.58M | ﹤0.01% |
112,300
+83,900
| +295% | +$1.08M |
|
2316
CALL
B2Gold
BTG
$5.16B
| $1.58M | ﹤0.01% |
438,500
-142,900
| -25% | -$469K |
|
2317
PUT
Terex
TEX
$7.98B
| $1.58M | ﹤0.01% |
33,900
+29,000
| +592% | +$1.21M |
|
2318
PUT
Elanco Animal Health
ELAN
$12.4B
| $1.58M | ﹤0.01% |
110,600
-83,200
| -43% | -$972K |
|
2319
CALL
Entergy
ETR
$54.1B
| $1.58M | ﹤0.01% |
19,000
-12,300
| -39% | -$1.02M |
|
2320
Brown & Brown
BRO
$22.9B
| $1.57M | ﹤0.01% |
14,209
+13,876
| +4,167% | +$1.56M |
|
2321
ZIM Integrated Shipping Services
ZIM
$3B
| $1.57M | ﹤0.01% |
97,939
-248,841
| -72% | -$3.92M |
|
|
FFAI
2322
PUT
Faraday Future Intelligent Electric
FFAI
$15.8M
| $1.57M | ﹤0.01% |
6,252
+2,451
| +64% | +$450K |
|
|
2323
PUT
Brown & Brown
BRO
$22.9B
| $1.57M | ﹤0.01% |
14,200
+7,300
| +106% | +$820K |
|
2324
Bumble
BMBL
$367M
| $1.57M | ﹤0.01% |
238,846
+41,268
| +21% | +$208K |
|
2325
PUT
Franco-Nevada
FNV
$41.4B
| $1.57M | ﹤0.01% |
9,600
-24,800
| -72% | -$4.11M |
|
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.