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 | |
|---|---|---|---|---|---|---|
5051
PUT
Ameren
AEE
$30.5B
| $100K | ﹤0.01% |
1,000
-500
| -33% | -$48.1K |
|
5052
PUT
ChargePoint
CHPT
$142M
| $100K | ﹤0.01% |
8,290
-4,190
| -34% | -$69.8K |
|
5053
Genco Shipping & Trading
GNK
$1.12B
| $100K | ﹤0.01% |
+7,491
| New | +$106K |
|
5054
CALL
RELX
RELX
$61.9B
| $100K | ﹤0.01% |
+2,000
| New | +$97.9K |
|
5055
PUT
UFP Technologies
UFPT
$1.98B
| $100K | ﹤0.01% |
500
+400
| +400% | +$96.8K |
|
5056
PUT
Worthington Enterprises
WOR
$2.76B
| $100K | ﹤0.01% |
+2,000
| New | +$84.3K |
|
|
ZEPP
5057
Zepp Health
ZEPP
$69.5M
| $100K | ﹤0.01% |
+34,003
| New | +$101K |
|
|
LGF.B
5058
DELISTED
Lions Gate Entertainment Corp. Class B Non-Voting Shares
LGF.B
| $100K | ﹤0.01% |
12,695
-10,326
| -45% | -$82.7K |
|
|
BDN
5059
CALL
Brandywine Realty Trust
BDN
$522M
| $99K | ﹤0.01% |
22,200
-3,100
| -12% | -$15.3K |
|
5060
CALL
Bloomin' Brands
BLMN
$738M
| $99K | ﹤0.01% |
13,900
-8,400
| -38% | -$89K |
|
5061
PUT
Black Stone Minerals
BSM
$3.17B
| $99K | ﹤0.01% |
6,500
-42,900
| -87% | -$644K |
|
5062
CALL
Bioventus
BVS
$888M
| $99K | ﹤0.01% |
10,900
+5,600
| +106% | +$55.9K |
|
5063
PUT
National Beverage
FIZZ
$2.98B
| $99K | ﹤0.01% |
2,400
-8,000
| -77% | -$330K |
|
5064
PUT
Liberty Media Series A
FWONA
$22.5B
| $99K | ﹤0.01% |
1,100
-24,600
| -96% | -$2.09M |
|
5065
CALL
Golub Capital BDC
GBDC
$3.33B
| $99K | ﹤0.01% |
6,600
+1,900
| +40% | +$29.2K |
|
5066
PUT
Jones Lang LaSalle
JLL
$16.6B
| $99K | ﹤0.01% |
400
-400
| -50% | -$105K |
|
5067
PUT
Pulmonx
LUNG
$73.1M
| $99K | ﹤0.01% |
+14,800
| New | +$105K |
|
5068
CALL
Mativ Holdings
MATV
$484M
| $99K | ﹤0.01% |
15,900
-295,900
| -95% | -$2.42M |
|
5069
PUT
LHA Market State Tactical Beta ETF
MSTB
$193M
| $99K | ﹤0.01% |
8,800
+1,100
| +14% | +$37.3K |
|
5070
Pacira BioSciences
PCRX
$1.03B
| $99K | ﹤0.01% |
3,984
-12,608
| -76% | -$302K |
|
5071
PUT
Packaging Corp of America
PKG
$21.9B
| $99K | ﹤0.01% |
500
-1,600
| -76% | -$341K |
|
|
TSVT
5072
PUT
DELISTED
2seventy bio
TSVT
| $99K | ﹤0.01% |
20,100
+19,300
| +2,413% | +$61.3K |
|
|
BDN
5073
PUT
Brandywine Realty Trust
BDN
$522M
| $98K | ﹤0.01% |
22,000
-16,600
| -43% | -$82.1K |
|
5074
CALL
EyePoint Inc
EYPT
$1.02B
| $98K | ﹤0.01% |
18,100
-5,900
| -25% | -$41.3K |
|
5075
Kura Oncology
KURA
$795M
| $98K | ﹤0.01% |
+14,863
| New | +$116K |
|
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.