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 | |
|---|---|---|---|---|---|---|
4476
CALL
SelectQuote
SLQT
$122M
| $205K | ﹤0.01% |
86,500
-49,100
| -36% | -$129K |
|
4477
Invesco S&P SmallCap Momentum ETF
XSMO
$2.94B
| $205K | ﹤0.01% |
+3,022
| New | +$193K |
|
4478
BBB Foods
TBBB
$4.76B
| $205K | ﹤0.01% |
7,390
-1,386
| -16% | -$39K |
|
4479
Casey's General Stores
CASY
$32.1B
| $204K | ﹤0.01% |
400
-11
| -3% | -$5.07K |
|
4480
EVgo
EVGO
$219M
| $204K | ﹤0.01% |
55,948
-28,162
| -33% | -$96.4K |
|
4481
CALL
Ivanhoe Electric
IE
$1.38B
| $204K | ﹤0.01% |
22,500
+22,300
| +11,150% | +$155K |
|
|
4482
PUT
Ivanhoe Electric
IE
$1.38B
| $204K | ﹤0.01% |
22,600
-2,100
| -9% | -$14.6K |
|
4483
CALL
Protolabs
PRLB
$1.7B
| $204K | ﹤0.01% |
5,100
-3,400
| -40% | -$127K |
|
|
SNCY
4484
CALL
DELISTED
Sun Country Airlines
SNCY
| $204K | ﹤0.01% |
17,400
+16,900
| +3,380% | +$186K |
|
4485
CALL
Turning Point Brands
TPB
$1.48B
| $204K | ﹤0.01% |
2,700
+1,500
| +125% | +$102K |
|
|
SAIL
4486
SailPoint Inc
SAIL
$9.01B
| $204K | ﹤0.01% |
8,928
+1,302
| +17% | +$24.6K |
|
4487
Cardiff Oncology
CRDF
$63M
| $203K | ﹤0.01% |
64,520
-58,913
| -48% | -$180K |
|
4488
PUT
CuriosityStream
CURI
$148M
| $203K | ﹤0.01% |
36,100
+2,100
| +6% | +$9.64K |
|
4489
PUT
Descartes Systems
DSGX
$6.68B
| $203K | ﹤0.01% |
+2,000
| New | +$211K |
|
4490
PUT
STAG Industrial
STAG
$7.44B
| $203K | ﹤0.01% |
5,600
+1,300
| +30% | +$45K |
|
4491
PUT
ADT
ADT
$5.43B
| $202K | ﹤0.01% |
23,900
-79,200
| -77% | -$648K |
|
4492
CALL
Evolent Health
EVH
$371M
| $202K | ﹤0.01% |
18,000
-17,000
| -49% | -$156K |
|
4493
CALL
Gladstone Capital
GLAD
$427M
| $202K | ﹤0.01% |
7,500
+7,100
| +1,775% | +$184K |
|
4494
CALL
Olema Pharmaceuticals
OLMA
$977M
| $202K | ﹤0.01% |
47,600
+46,600
| +4,660% | +$208K |
|
4495
Trex
TREX
$4.4B
| $202K | ﹤0.01% |
+3,724
| New | +$211K |
|
4496
CALL
Utz Brands
UTZ
$1.24B
| $202K | ﹤0.01% |
16,100
-15,500
| -49% | -$203K |
|
4497
PUT
Abeona Therapeutics
ABEO
$355M
| $201K | ﹤0.01% |
35,500
+32,800
| +1,215% | +$187K |
|
|
CVGW
4498
DELISTED
Calavo Growers
CVGW
| $201K | ﹤0.01% |
7,579
+3,792
| +100% | +$99.1K |
|
4499
PUT
Equitable Holdings
EQH
$13.2B
| $201K | ﹤0.01% |
3,600
+3,300
| +1,100% | +$170K |
|
4500
CALL
Hippo Holdings
HIPO
$777M
| $201K | ﹤0.01% |
7,200
+1,500
| +26% | +$37K |
|
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.