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 | |
|---|---|---|---|---|---|---|
4301
CALL
BRC Group Holdings
RILY
$263M
| $243K | ﹤0.01% |
81,900
-30,300
| -27% | -$93.1K |
|
4302
CALL
Similarweb
SMWB
$625M
| $243K | ﹤0.01% |
31,100
-23,300
| -43% | -$174K |
|
4303
PUT
TriMas Corp
TRS
$1.4B
| $243K | ﹤0.01% |
8,500
| – | – |
|
4304
PUT
Aemetis
AMTX
$101M
| $242K | ﹤0.01% |
97,600
-14,100
| -13% | -$23.8K |
|
4305
CALL
Build-A-Bear
BBW
$444M
| $242K | ﹤0.01% |
4,700
+2,800
| +147% | +$119K |
|
4306
CALL
Kanzhun
BZ
$7.22B
| $242K | ﹤0.01% |
13,600
-69,000
| -84% | -$1.16M |
|
4307
CALL
Commerce Bancshares
CBSH
$8.72B
| $242K | ﹤0.01% |
+4,095
| New | +$240K |
|
4308
Clorox
CLX
$12.1B
| $242K | ﹤0.01% |
+2,022
| New | +$270K |
|
4309
CALL
Capital Southwest
CSWC
$1.48B
| $242K | ﹤0.01% |
11,000
+5,000
| +83% | +$103K |
|
|
DX
4310
Dynex Capital
DX
$3.19B
| $242K | ﹤0.01% |
19,811
+11,442
| +137% | +$139K |
|
4311
Omnicom Group
OMC
$23.6B
| $242K | ﹤0.01% |
+3,365
| New | +$249K |
|
4312
CALL
Woodside Energy
WDS
$44B
| $242K | ﹤0.01% |
15,700
+10,300
| +191% | +$144K |
|
4313
PUT
Kinsale Capital Group
KNSL
$8.59B
| $241K | ﹤0.01% |
500
-1,600
| -76% | -$746K |
|
4314
CALL
SiteOne Landscape Supply
SITE
$4.04B
| $241K | ﹤0.01% |
2,000
+100
| +5% | +$11.8K |
|
4315
CALL
EnerSys
ENS
$6.43B
| $240K | ﹤0.01% |
2,800
-10,900
| -80% | -$950K |
|
4316
CALL
Finance of America Companies
FOA
$214M
| $240K | ﹤0.01% |
10,300
-65,800
| -86% | -$1.38M |
|
4317
CALL
Lexicon Pharmaceuticals
LXRX
$1.03B
| $240K | ﹤0.01% |
254,100
+2,500
| +1% | +$1.62K |
|
4318
Morgan Stanley Direct Lending Fund
MSDL
$1.27B
| $240K | ﹤0.01% |
12,822
-5,082
| -28% | -$98.3K |
|
4319
CALL
Spire Global
SPIR
$408M
| $240K | ﹤0.01% |
20,200
-68,400
| -77% | -$690K |
|
4320
Telesat
TSAT
$522M
| $240K | ﹤0.01% |
9,857
-24,321
| -71% | -$427K |
|
|
CADE
4321
CALL
DELISTED
Cadence Bank
CADE
| $239K | ﹤0.01% |
7,500
+7,400
| +7,400% | +$222K |
|
4322
Main Street Capital
MAIN
$5.11B
| $239K | ﹤0.01% |
4,047
-16,067
| -80% | -$888K |
|
4323
Mobileye
MBLY
$2.04B
| $239K | ﹤0.01% |
13,328
-110,319
| -89% | -$1.69M |
|
4324
PUT
DTE Energy
DTE
$30.1B
| $238K | ﹤0.01% |
1,800
-14,300
| -89% | -$1.92M |
|
|
ELME
4325
PUT
Elme Communities
ELME
$142M
| $238K | ﹤0.01% |
+15,000
| New | +$238K |
|
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.