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 | |
|---|---|---|---|---|---|---|
7651
PUT
Pulmonx
LUNG
$49.4M
| $6K | ﹤0.01% |
2,700
-12,100
| -82% | -$47.7K |
|
7652
LiveWire
LVWR
$299M
| $6K | ﹤0.01% |
1,355
+1,258
| +1,297% | +$3.77K |
|
7653
PUT
Mativ Holdings
MATV
$448M
| $6K | ﹤0.01% |
900
-7,400
| -89% | -$42.6K |
|
7654
MacroGenics
MGNX
$235M
| $6K | ﹤0.01% |
+5,010
| New | +$7.27K |
|
|
7655
PUT
MacroGenics
MGNX
$235M
| $6K | ﹤0.01% |
5,100
-1,100
| -18% | -$1.6K |
|
7656
Movado Group
MOV
$812M
| $6K | ﹤0.01% |
+412
| New | +$6.3K |
|
|
MRC
7657
PUT
DELISTED
MRC Global
MRC
| $6K | ﹤0.01% |
500
-100
| -17% | -$1.21K |
|
7658
CALL
Myomo
MYO
$37.5M
| $6K | ﹤0.01% |
2,900
-300
| -9% | -$1.09K |
|
7659
PUT
Northeast Community Bancorp
NECB
$368M
| $6K | ﹤0.01% |
+300
| New | +$6.79K |
|
7660
CALL
Insperity
NSP
$1.85B
| $6K | ﹤0.01% |
+100
| New | +$6.99K |
|
|
7661
PUT
Insperity
NSP
$1.85B
| $6K | ﹤0.01% |
+100
| New | +$6.99K |
|
|
NTST
7662
PUT
NETSTREIT Corp
NTST
$2.16B
| $6K | ﹤0.01% |
400
+200
| +100% | +$3.2K |
|
7663
Orthofix Medical
OFIX
$455M
| $6K | ﹤0.01% |
+620
| New | +$7.68K |
|
7664
PUT
One Stop Systems
OSS
$309M
| $6K | ﹤0.01% |
1,800
+100
| +6% | +$279 |
|
7665
VanEck Merk Gold Trust
OUNZ
$2.51B
| $6K | ﹤0.01% |
+199
| New | +$6.3K |
|
7666
Prosperity Bancshares
PB
$8.77B
| $6K | ﹤0.01% |
+86
| New | +$5.92K |
|
|
PLYM
7667
PUT
DELISTED
Plymouth Industrial REIT
PLYM
| $6K | ﹤0.01% |
400
+200
| +100% | +$3.12K |
|
7668
CarParts.com
PRTS
$42.8M
| $6K | ﹤0.01% |
922
-3,242
| -78% | -$27.7K |
|
|
PVL
7669
Permianville Royalty Trust
PVL
$56.1M
| $6K | ﹤0.01% |
3,667
-18,803
| -84% | -$30.1K |
|
|
REE
7670
CALL
DELISTED
REE Automotive
REE
| $6K | ﹤0.01% |
+11,100
| New | +$19.5K |
|
7671
CALL
RXO
RXO
$4.23B
| $6K | ﹤0.01% |
400
-300
| -43% | -$4.55K |
|
7672
CALL
SIGA Technologies
SIGA
$223M
| $6K | ﹤0.01% |
1,000
-3,100
| -76% | -$18.6K |
|
7673
CALL
SEACOR Marine Holdings
SMHI
$216M
| $6K | ﹤0.01% |
+1,300
| New | +$6.58K |
|
7674
CALL
Standard Motor Products
SMP
$861M
| $6K | ﹤0.01% |
+200
| New | +$5.53K |
|
|
SNBR
7675
PUT
DELISTED
Sleep Number
SNBR
| $6K | ﹤0.01% |
900
-1,300
| -59% | -$9.92K |
|
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.