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 | |
|---|---|---|---|---|---|---|
7076
PUT
Solid Biosciences
SLDB
$777M
| $14K | ﹤0.01% |
2,900
-51,300
| -95% | -$181K |
|
7077
CALL
Spok Holdings
SPOK
$226M
| $14K | ﹤0.01% |
800
-1,200
| -60% | -$19.4K |
|
|
STR
7078
PUT
DELISTED
Sitio Royalties
STR
| $14K | ﹤0.01% |
800
+700
| +700% | +$12.6K |
|
7079
CALL
Gentherm
THRM
$1.29B
| $14K | ﹤0.01% |
500
-1,900
| -79% | -$50.4K |
|
7080
CALL
Tango Therapeutics
TNGX
$4.35B
| $14K | ﹤0.01% |
+2,800
| New | +$6.92K |
|
7081
CALL
Vertex
VERX
$2.05B
| $14K | ﹤0.01% |
400
-2,600
| -87% | -$98.9K |
|
7082
iShares Global Timber & Forestry ETF
WOOD
$261M
| $14K | ﹤0.01% |
197
-472
| -71% | -$34.4K |
|
7083
WidePoint Corp
WYY
$106M
| $14K | ﹤0.01% |
+4,376
| New | +$15.7K |
|
|
APPX
7084
Tradr 2X Long APP Daily ETF
APPX
$64.6M
| $14K | ﹤0.01% |
+380
| New | +$15.8K |
|
|
SBDS
7085
DELISTED
Solo Brands Inc
SBDS
| $14K | ﹤0.01% |
1,208
-20
| -2% | -$113 |
|
7086
PUT
Advanced Energy
AEIS
$11.7B
| $13K | ﹤0.01% |
100
-4,500
| -98% | -$496K |
|
|
GOLD
7087
PUT
Gold.com Inc
GOLD
$1.19B
| $13K | ﹤0.01% |
600
-1,100
| -65% | -$24.4K |
|
7088
CALL
BJ's Restaurants
BJRI
$1.45B
| $13K | ﹤0.01% |
300
-2,200
| -88% | -$86.8K |
|
|
BLRX
7089
CALL
BioLineRX
BLRX
$12.3M
| $13K | ﹤0.01% |
+3,000
| New | +$11.1K |
|
|
BRFS
7090
DELISTED
BRF SA
BRFS
| $13K | ﹤0.01% |
3,818
+2,448
| +179% | +$8.86K |
|
7091
Direxion Daily MSCI Brazil Bull 2X ETF
BRZU
$101M
| $13K | ﹤0.01% |
207
-8
| -4% | -$457 |
|
7092
PUT
Byline Bancorp
BY
$1.76B
| $13K | ﹤0.01% |
+500
| New | +$12.8K |
|
|
CAN
7093
PUT
Canaan Creative
CAN
$192M
| $13K | ﹤0.01% |
21,700
-108,600
| -83% | -$76.4K |
|
7094
CALL
Core Laboratories
CLB
$518M
| $13K | ﹤0.01% |
1,200
+800
| +200% | +$9.49K |
|
|
CLPR
7095
Clipper Realty
CLPR
$46.4M
| $13K | ﹤0.01% |
3,784
-7,316
| -66% | -$28K |
|
7096
Claros Mortgage Trust
CMTG
$307M
| $13K | ﹤0.01% |
4,780
-15,985
| -77% | -$42.9K |
|
7097
PUT
Cumberland Pharmaceuticals
CPIX
$105M
| $13K | ﹤0.01% |
4,000
+3,400
| +567% | +$16.1K |
|
7098
Camden Property Trust
CPT
$11.2B
| $13K | ﹤0.01% |
122
-245
| -67% | -$28.3K |
|
7099
CALL
Viant Technology
DSP
$226M
| $13K | ﹤0.01% |
1,000
+200
| +25% | +$2.74K |
|
7100
CALL
Forum Energy Technologies
FET
$640M
| $13K | ﹤0.01% |
700
-1,300
| -65% | -$21K |
|
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.