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 | |
|---|---|---|---|---|---|---|
1751
PUT
Immunovant
IMVT
$8.09B
| $2.72M | ﹤0.01% |
159,300
+78,300
| +97% | +$1.64M |
|
1752
PUT
Dynatrace
DT
$12.1B
| $2.71M | ﹤0.01% |
57,600
-42,300
| -42% | -$2.31M |
|
1753
CALL
Diageo
DEO
$46.2B
| $2.71M | ﹤0.01% |
25,900
-14,300
| -36% | -$1.62M |
|
1754
PUT
Intuitive Machines
LUNR
$2.07B
| $2.71M | ﹤0.01% |
364,400
-199,700
| -35% | -$3.14M |
|
1755
Marathon Petroleum
MPC
$90.3B
| $2.71M | ﹤0.01% |
+18,626
| New | +$2.76M |
|
1756
PUT
CoreCivic
CXW
$3.1B
| $2.71M | ﹤0.01% |
133,500
-81,000
| -38% | -$1.63M |
|
1757
CALL
Signet Jewelers
SIG
$3.55B
| $2.71M | ﹤0.01% |
46,600
+9,300
| +25% | +$532K |
|
1758
iShares China Large-Cap ETF
FXI
$4.31B
| $2.7M | ﹤0.01% |
+75,398
| New | +$2.55M |
|
1759
Grab
GRAB
$13.5B
| $2.7M | ﹤0.01% |
+596,018
| New | +$2.78M |
|
1760
PUT
QuantumScape Corp
QS
$3B
| $2.7M | ﹤0.01% |
648,500
-345,100
| -35% | -$1.71M |
|
1761
PUT
Xcel Energy
XEL
$51B
| $2.7M | ﹤0.01% |
38,100
+31,500
| +477% | +$2.14M |
|
1762
PUT
Northern Trust
NTRS
$22.2B
| $2.69M | ﹤0.01% |
27,300
+14,700
| +117% | +$1.56M |
|
|
AMTM
1763
PUT
Amentum Holdings
AMTM
$5.51B
| $2.69M | ﹤0.01% |
148,000
-220,700
| -60% | -$4.5M |
|
1764
PUT
Lemonade
LMND
$4.62B
| $2.69M | ﹤0.01% |
85,600
-279,500
| -77% | -$9.62M |
|
1765
CALL
Applied Optoelectronics
AAOI
$8.04B
| $2.68M | ﹤0.01% |
174,900
-152,600
| -47% | -$3.84M |
|
1766
CALL
SBA Communications
SBAC
$18.4B
| $2.68M | ﹤0.01% |
12,200
-1,700
| -12% | -$356K |
|
|
WBA
1767
DELISTED
Walgreens Boots Alliance
WBA
| $2.68M | ﹤0.01% |
240,150
-770,749
| -76% | -$8.37M |
|
1768
PUT
Martin Marietta Materials
MLM
$33.6B
| $2.68M | ﹤0.01% |
5,600
-100
| -2% | -$50.8K |
|
1769
CALL
Entergy
ETR
$54.1B
| $2.67M | ﹤0.01% |
31,300
+13,000
| +71% | +$1.07M |
|
1770
Lincoln National
LNC
$7.91B
| $2.67M | ﹤0.01% |
74,477
+47,401
| +175% | +$1.68M |
|
1771
CALL
Builders FirstSource
BLDR
$7.84B
| $2.67M | ﹤0.01% |
21,400
-47,900
| -69% | -$6.97M |
|
1772
PUT
Invesco CurrencyShares Japanese Yen Trust
FXY
$423M
| $2.67M | ﹤0.01% |
43,400
-31,700
| -42% | -$1.92M |
|
1773
Kyndryl
KD
$2.66B
| $2.67M | ﹤0.01% |
+85,013
| New | +$3.19M |
|
1774
PUT
Church & Dwight Co
CHD
$23.1B
| $2.66M | ﹤0.01% |
24,200
+23,700
| +4,740% | +$2.54M |
|
1775
CALL
Idaho Strategic Resources
IDR
$449M
| $2.66M | ﹤0.01% |
185,700
+115,200
| +163% | +$1.42M |
|
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.