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 | |
|---|---|---|---|---|---|---|
5126
Xylem
XYL
$27.3B
| $93K | ﹤0.01% |
785
-1,476
| -65% | -$183K |
|
|
LB
5127
CALL
LandBridge Co
LB
$2.16B
| $93K | ﹤0.01% |
1,300
-5,300
| -80% | -$375K |
|
5128
PUT
Aldeyra Therapeutics
ALDX
$92.9M
| $92K | ﹤0.01% |
16,000
-6,100
| -28% | -$36.1K |
|
5129
Aurora
AUR
$12.6B
| $92K | ﹤0.01% |
+13,788
| New | +$98.7K |
|
5130
CALL
Invesco DB Commodity Index Tracking Fund
DBC
$1.69B
| $92K | ﹤0.01% |
4,100
-9,900
| -71% | -$219K |
|
|
ESPR
5131
PUT
DELISTED
Esperion Therapeutics
ESPR
| $92K | ﹤0.01% |
64,400
-151,600
| -70% | -$279K |
|
5132
PUT
Fulton Financial
FULT
$4.66B
| $92K | ﹤0.01% |
+5,100
| New | +$99.4K |
|
5133
Gladstone Investment Corp
GAIN
$643M
| $92K | ﹤0.01% |
6,907
+148
| +2% | +$1.99K |
|
5134
PUT
Genworth Financial
GNW
$3.76B
| $92K | ﹤0.01% |
13,000
+12,500
| +2,500% | +$86.9K |
|
|
HIVE
5135
PUT
HIVE Digital Technologies
HIVE
$774M
| $92K | ﹤0.01% |
63,500
-2,700
| -4% | -$6.64K |
|
5136
Linde
LIN
$221B
| $92K | ﹤0.01% |
+198
| New | +$89.1K |
|
5137
CALL
ManpowerGroup
MAN
$2.44B
| $92K | ﹤0.01% |
1,600
+100
| +7% | +$5.81K |
|
5138
MillerKnoll
MLKN
$1.53B
| $92K | ﹤0.01% |
4,810
+3,739
| +349% | +$79.5K |
|
5139
CALL
Marqeta
MQ
$1.83B
| $92K | ﹤0.01% |
5,625
-39,800
| -88% | -$627K |
|
|
NOTE
5140
CALL
DELISTED
FiscalNote
NOTE
| $92K | ﹤0.01% |
9,492
+9,175
| +2,894% | +$138K |
|
5141
PUT
SunCoke Energy
SXC
$720M
| $92K | ﹤0.01% |
10,100
+3,500
| +53% | +$33.6K |
|
5142
PUT
Transportadora de Gas del Sur
TGS
$4.79B
| $92K | ﹤0.01% |
3,500
+2,500
| +250% | +$69.4K |
|
5143
Direxion Daily Utilities Bull 3X ETF
UTSL
$40M
| $92K | ﹤0.01% |
2,658
+2,161
| +435% | +$74.1K |
|
5144
PUT
Global X S&P 500 Tail Risk ETF
XTR
$4.8M
| $92K | ﹤0.01% |
4,000
+600
| +18% | +$16.4K |
|
|
CTLP
5145
DELISTED
Cantaloupe
CTLP
| $91K | ﹤0.01% |
11,673
-55,003
| -82% | -$488K |
|
5146
PUT
CuriosityStream
CURI
$145M
| $91K | ﹤0.01% |
34,000
+33,200
| +4,150% | +$80.7K |
|
5147
Dyne Therapeutics
DYN
$4.7B
| $91K | ﹤0.01% |
+8,795
| New | +$126K |
|
5148
iShares S&P GSCI Commodity-Indexed Trust
GSG
$998M
| $91K | ﹤0.01% |
4,027
-1,707
| -30% | -$38.4K |
|
5149
Disc Medicine
IRON
$2.94B
| $91K | ﹤0.01% |
+1,840
| New | +$102K |
|
5150
T-REX 2X Long Tesla Daily Target ETF
TSLT
$124M
| $91K | ﹤0.01% |
7,043
+6,424
| +1,038% | +$163K |
|
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.