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 | |
|---|---|---|---|---|---|---|
|
EVRI
4276
DELISTED
Everi Holdings
EVRI
| $247K | ﹤0.01% |
17,394
-3,127
| -15% | -$43.7K |
|
4277
CALL
Medifast
MED
$108M
| $247K | ﹤0.01% |
17,600
+1,600
| +10% | +$21K |
|
4278
CALL
Sundial Growers
SNDL
$315M
| $247K | ﹤0.01% |
204,800
+104,100
| +103% | +$139K |
|
4279
CALL
United States Copper Index Fund
CPER
$741M
| $246K | ﹤0.01% |
7,800
-19,400
| -71% | -$575K |
|
|
GTLS
4280
CALL
DELISTED
Chart Industries
GTLS
| $246K | ﹤0.01% |
1,500
-3,300
| -69% | -$485K |
|
4281
PUT
Inspire Medical Systems
INSP
$1.49B
| $246K | ﹤0.01% |
1,900
+700
| +58% | +$102K |
|
4282
PUT
Surgery Partners
SGRY
$2.06B
| $246K | ﹤0.01% |
11,100
+10,100
| +1,010% | +$225K |
|
4283
CALL
Xometry
XMTR
$4.62B
| $246K | ﹤0.01% |
7,300
+1,000
| +16% | +$29.3K |
|
4284
PUT
Zebra Technologies
ZBRA
$13.6B
| $246K | ﹤0.01% |
+800
| New | +$217K |
|
4285
Aemetis
AMTX
$107M
| $245K | ﹤0.01% |
99,077
+9,247
| +10% | +$15.6K |
|
4286
CALL
Milestone Pharmaceuticals
MIST
$133M
| $245K | ﹤0.01% |
126,800
+79,000
| +165% | +$105K |
|
4287
PUT
Vanguard Dividend Appreciation ETF
VIG
$112B
| $245K | ﹤0.01% |
1,200
+400
| +50% | +$77.5K |
|
|
VRNT
4288
CALL
DELISTED
Verint Systems
VRNT
| $245K | ﹤0.01% |
12,500
-11,800
| -49% | -$206K |
|
4289
PUT
Vitesse Energy
VTS
$644M
| $245K | ﹤0.01% |
11,100
-13,200
| -54% | -$289K |
|
4290
PUT
Warby Parker
WRBY
$3.15B
| $245K | ﹤0.01% |
11,200
+6,200
| +124% | +$115K |
|
4291
PUT
Kymera Therapeutics
KYMR
$8.81B
| $244K | ﹤0.01% |
+5,600
| New | +$193K |
|
4292
PUT
Children's Place
PLCE
$56.9M
| $244K | ﹤0.01% |
55,100
+7,400
| +16% | +$41.7K |
|
4293
PUT
RB Global
RBA
$21.5B
| $244K | ﹤0.01% |
2,300
-500
| -18% | -$51.3K |
|
|
RNAM
4294
CALL
DELISTED
Avidity Biosciences
RNAM
| $244K | ﹤0.01% |
8,600
-1,800
| -17% | -$53.7K |
|
4295
CALL
Construction Partners
ROAD
$5.95B
| $244K | ﹤0.01% |
2,300
+1,800
| +360% | +$168K |
|
4296
CALL
Takeda Pharmaceutical
TAK
$56.3B
| $244K | ﹤0.01% |
15,800
+11,100
| +236% | +$164K |
|
4297
ARK Space & Defense Innovation ETF
ARKX
$793M
| $243K | ﹤0.01% |
10,078
+3,392
| +51% | +$67.7K |
|
|
BASE
4298
CALL
DELISTED
Couchbase
BASE
| $243K | ﹤0.01% |
10,000
-900
| -8% | -$16.4K |
|
4299
PUT
Covenant Logistics
CVLG
$1.09B
| $243K | ﹤0.01% |
10,100
+8,900
| +742% | +$193K |
|
4300
CALL
Gold Royalty Corp
GROY
$591M
| $243K | ﹤0.01% |
110,400
+97,000
| +724% | +$170K |
|
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.