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 | |
|---|---|---|---|---|---|---|
5151
United Microelectronic
UMC
$47.7B
| $91K | ﹤0.01% |
12,740
-3,131
| -20% | -$19.9K |
|
5152
PUT
Warby Parker
WRBY
$3.28B
| $91K | ﹤0.01% |
5,000
-91,100
| -95% | -$2.17M |
|
|
LGF.B
5153
PUT
DELISTED
Lions Gate Entertainment Corp. Class B Non-Voting Shares
LGF.B
| $91K | ﹤0.01% |
10,300
+9,200
| +836% | +$73.7K |
|
|
NKLA
5154
PUT
DELISTED
Nikola Corporation Common Stock
NKLA
| $91K | ﹤0.01% |
723,200
-642,000
| -47% | -$563K |
|
|
VFLQ
5155
PUT
DELISTED
Vanguard U.S. Liquidity Factor ETF
VFLQ
| $91K | ﹤0.01% |
600
-200
| -25% | -$30.3K |
|
5156
CALL
Aemetis
AMTX
$106M
| $90K | ﹤0.01% |
52,200
-1,000
| -2% | -$2.14K |
|
5157
VanEck ChiNext Innovators ETF
CNXT
$105M
| $90K | ﹤0.01% |
3,271
-10,949
| -77% | -$306K |
|
|
CVGW
5158
DELISTED
Calavo Growers
CVGW
| $90K | ﹤0.01% |
3,787
+1,099
| +41% | +$25.8K |
|
|
DENN
5159
PUT
DELISTED
Denny's
DENN
| $90K | ﹤0.01% |
24,700
+24,400
| +8,133% | +$128K |
|
|
EFXT
5160
CALL
Enerflex
EFXT
$2.72B
| $90K | ﹤0.01% |
11,700
+10,800
| +1,200% | +$95.5K |
|
5161
PUT
Indivior Pharmaceuticals
INDV
$4.73B
| $90K | ﹤0.01% |
9,500
-100
| -1% | -$1.05K |
|
5162
PUT
Mercury Systems
MRCY
$5.83B
| $90K | ﹤0.01% |
2,100
+500
| +31% | +$21.9K |
|
5163
PUT
MYR Group
MYRG
$5.19B
| $90K | ﹤0.01% |
+800
| New | +$106K |
|
5164
PUT
ODDITY Tech
ODD
$654M
| $90K | ﹤0.01% |
2,100
+1,200
| +133% | +$53.3K |
|
|
SGMO
5165
CALL
DELISTED
SANGAMO THERAPEUTICS INC
SGMO
| $90K | ﹤0.01% |
137,200
+57,500
| +72% | +$60.9K |
|
5166
CALL
Teekay
TK
$1.01B
| $90K | ﹤0.01% |
13,800
+10,400
| +306% | +$71.9K |
|
5167
CALL
Abeona Therapeutics
ABEO
$366M
| $89K | ﹤0.01% |
18,900
+7,500
| +66% | +$40.8K |
|
5168
ProShares Ultra Silver
AGQ
$1.15B
| $89K | ﹤0.01% |
1,931
-26,224
| -93% | -$1.08M |
|
5169
Anavex Life Sciences
AVXL
$255M
| $89K | ﹤0.01% |
10,427
+1,429
| +16% | +$13.5K |
|
5170
CALL
Baytex Energy
BTE
$3.25B
| $89K | ﹤0.01% |
40,000
+37,400
| +1,438% | +$89.1K |
|
5171
PUT
Genco Shipping & Trading
GNK
$1.11B
| $89K | ﹤0.01% |
6,700
+3,300
| +97% | +$46.8K |
|
5172
PUT
HighPeak Energy
HPK
$903M
| $89K | ﹤0.01% |
7,100
-40,900
| -85% | -$550K |
|
5173
CALL
Novanta
NOVT
$5.08B
| $89K | ﹤0.01% |
700
| – | – |
|
5174
PUT
Saic
SAIC
$4.95B
| $89K | ﹤0.01% |
800
-8,300
| -91% | -$897K |
|
5175
CALL
Vir Biotechnology
VIR
$1.46B
| $89K | ﹤0.01% |
13,800
+4,900
| +55% | +$43.6K |
|
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.