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 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$272M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$99M |
| 3 |
NVIDIA
NVDA
|
+$89.9M |
| 4 |
TSMC
TSM
|
+$87.7M |
| 5 |
Amazon
AMZN
|
+$61M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Apple
AAPL
|
+$518M |
| 2 |
Strategy Inc
MSTR
|
+$81.2M |
| 3 |
Alibaba
BABA
|
+$66.7M |
| 4 |
Advanced Micro Devices
AMD
|
+$44.3M |
| 5 |
Uber
UBER
|
+$41.3M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.41% |
| 2 | Consumer Discretionary | 0.22% |
| 3 | Healthcare | 0.17% |
| 4 | Communication Services | 0.15% |
| 5 | Financials | 0.13% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
2551
CALL
Fastly Inc
FSLY
$3.17B
| $1.17M | ﹤0.01% |
184,400
-124,200
| -40% | -$1.04M |
|
|
NVEE
2552
DELISTED
NV5 Global
NVEE
| $1.17M | ﹤0.01% |
60,604
+58,796
| +3,252% | +$1.08M |
|
2553
PUT
BBVA Argentina
BBAR
$3.85B
| $1.17M | ﹤0.01% |
64,300
+30,700
| +91% | +$625K |
|
2554
Liquidia Corp
LQDA
$7.67B
| $1.17M | ﹤0.01% |
79,027
+38,793
| +96% | +$566K |
|
2555
CALL
Cheesecake Factory
CAKE
$4.21B
| $1.16M | ﹤0.01% |
23,900
-25,300
| -51% | -$1.3M |
|
2556
PUT
Ionis Pharmaceuticals
IONS
$9.35B
| $1.16M | ﹤0.01% |
38,500
-11,500
| -23% | -$377K |
|
2557
NETGEAR
NTGR
$669M
| $1.16M | ﹤0.01% |
47,455
+16,778
| +55% | +$441K |
|
2558
PUT
Intellia Therapeutics
NTLA
$1.5B
| $1.16M | ﹤0.01% |
163,200
+56,100
| +52% | +$567K |
|
2559
iShares MSCI South Korea ETF
EWY
$21.7B
| $1.16M | ﹤0.01% |
21,441
-24,255
| -53% | -$1.34M |
|
2560
PUT
Hubbell
HUBB
$25.7B
| $1.16M | ﹤0.01% |
+3,500
| New | +$1.36M |
|
|
CIM
2561
PUT
Chimera Investment
CIM
$1.05B
| $1.16M | ﹤0.01% |
90,200
+58,700
| +186% | +$825K |
|
2562
CALL
MannKind Corp
MNKD
$1.28B
| $1.16M | ﹤0.01% |
229,900
-35,400
| -13% | -$198K |
|
2563
PUT
Molson Coors Class B
TAP
$7.68B
| $1.16M | ﹤0.01% |
19,000
+500
| +3% | +$28.8K |
|
2564
PUT
ING
ING
$93.8B
| $1.16M | ﹤0.01% |
59,000
+14,200
| +32% | +$252K |
|
2565
Lemonade
LMND
$4.62B
| $1.16M | ﹤0.01% |
36,769
+28,952
| +370% | +$996K |
|
|
KLC
2566
PUT
KinderCare Learning Companies
KLC
$584M
| $1.15M | ﹤0.01% |
+99,600
| New | +$1.85M |
|
2567
PUT
US Foods
USFD
$21.4B
| $1.15M | ﹤0.01% |
17,600
-12,500
| -42% | -$854K |
|
|
QXO
2568
PUT
QXO Inc
QXO
$14.2B
| $1.15M | ﹤0.01% |
85,100
+69,800
| +456% | +$949K |
|
2569
PUT
Insmed
INSM
$23.2B
| $1.15M | ﹤0.01% |
15,100
-40,000
| -73% | -$3.06M |
|
2570
PUT
Lantheus
LNTH
$6.82B
| $1.15M | ﹤0.01% |
11,800
-12,400
| -51% | -$1.16M |
|
2571
Direxion Daily Energy Bull 2X ETF
ERX
$249M
| $1.15M | ﹤0.01% |
+17,603
| New | +$1.07M |
|
2572
CALL
Ouster
OUST
$2.29B
| $1.15M | ﹤0.01% |
128,000
+56,300
| +79% | +$556K |
|
2573
PUT
Vanguard FTSE Developed Markets ETF
VEA
$226B
| $1.15M | ﹤0.01% |
22,600
+22,300
| +7,433% | +$1.13M |
|
2574
CALL
AeroVironment
AVAV
$7.57B
| $1.14M | ﹤0.01% |
9,600
-16,700
| -63% | -$2.56M |
|
|
OSG
2575
Octave Specialty Group
OSG
$252M
| $1.14M | ﹤0.01% |
+130,671
| New | +$1.38M |
|
Similar funds
Simplex Trading's Q1 2025 Portfolio in Review
As of Q1 2025, Simplex Trading held 10,070 positions worth $156B, down 13% from $179B the previous quarter. Its ten largest holdings account for 51% of the portfolio.
Simplex Trading withdrew a net $7.93B in Q1 2025, closing 1,547 positions and reducing 3,654 holdings. Its most notable exit was Alibaba, an estimated $66.7M position sold in full.
By sector, the portfolio is most concentrated in Technology at 0.41% of assets, down from 0.68% a quarter earlier, followed by Consumer Discretionary and Healthcare.
Against the trend, Simplex Trading opened a new position in iShares 20+ Year Treasury Bond ETF worth $278M.
- Simplex Trading's largest Q1 2025 buy was iShares 20+ Year Treasury Bond ETF: 3,057,978 shares worth $278M.
- Simplex Trading added most to NVIDIA in Q1 2025, an estimated $89.9M increase.
- Simplex Trading's biggest Q1 2025 reduction was Apple, cutting an estimated $518M.
- Simplex Trading fully exited Alibaba in Q1 2025, selling an estimated $66.7M.
- Simplex Trading's ten largest holdings make up 51% of its $156B portfolio in Q1 2025.
- Simplex Trading opened 1,566 new positions and closed 1,547 in Q1 2025.
- Simplex Trading's portfolio value fell 13% quarter-over-quarter to $156B.
Based on Simplex Trading's 13F filing for Q1 2025, filed 12 May 2025.