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 | |
|---|---|---|---|---|---|---|
1726
CALL
Vermilion Energy
VET
$1.73B
| $2.79M | ﹤0.01% |
343,900
+126,100
| +58% | +$1.13M |
|
1727
PUT
Insulet
PODD
$11.3B
| $2.78M | ﹤0.01% |
10,600
-11,500
| -52% | -$3.11M |
|
|
GRRR
1728
CALL
Gorilla Technology Group
GRRR
$333M
| $2.78M | ﹤0.01% |
93,800
+43,400
| +86% | +$984K |
|
1729
SoundHound AI
SOUN
$2.68B
| $2.78M | ﹤0.01% |
341,988
+267,257
| +358% | +$3.33M |
|
1730
CALL
POET Technologies
POET
$1.19B
| $2.77M | ﹤0.01% |
734,000
-30,200
| -4% | -$137K |
|
1731
CALL
Rithm Capital
RITM
$5.09B
| $2.77M | ﹤0.01% |
242,300
+124,500
| +106% | +$1.44M |
|
1732
Under Armour
UAA
$3B
| $2.77M | ﹤0.01% |
443,647
+262,106
| +144% | +$1.95M |
|
1733
CALL
First Trust Consumer Discretionary AlphaDEX Fund
FXD
$263M
| $2.77M | ﹤0.01% |
28,500
+25,100
| +738% | +$1.59M |
|
1734
PUT
Invesco CurrencyShares Euro Currency Trust
FXE
$331M
| $2.77M | ﹤0.01% |
27,700
+7,300
| +36% | +$710K |
|
1735
CALL
Alexandria Real Estate Equities
ARE
$8.88B
| $2.77M | ﹤0.01% |
29,900
-14,700
| -33% | -$1.44M |
|
1736
Trip.com Group
TCOM
$27.5B
| $2.77M | ﹤0.01% |
43,503
+11,668
| +37% | +$764K |
|
1737
CALL
ProShares UltraShort Health Care
RXD
$3.25M
| $2.76M | ﹤0.01% |
42,350
-73,650
| -63% | -$1.59M |
|
1738
CALL
GXO Logistics
GXO
$6.06B
| $2.75M | ﹤0.01% |
70,500
-18,400
| -21% | -$768K |
|
1739
CALL
New York Times
NYT
$11.6B
| $2.75M | ﹤0.01% |
55,500
+51,700
| +1,361% | +$2.6M |
|
|
BLUE
1740
CALL
DELISTED
bluebird bio
BLUE
| $2.75M | ﹤0.01% |
563,500
-19,200
| -3% | -$115K |
|
1741
PUT
Viper Energy
VNOM
$8.81B
| $2.75M | ﹤0.01% |
60,900
+43,500
| +250% | +$2.05M |
|
1742
CALL
ADMA Biologics
ADMA
$1.92B
| $2.75M | ﹤0.01% |
138,500
-8,200
| -6% | -$142K |
|
1743
CALL
LPL Financial
LPLA
$26.3B
| $2.75M | ﹤0.01% |
8,400
+3,700
| +79% | +$1.29M |
|
1744
CALL
Old Dominion Freight Line
ODFL
$48.5B
| $2.75M | ﹤0.01% |
16,600
+3,400
| +26% | +$618K |
|
1745
PUT
Air Products & Chemicals
APD
$66.3B
| $2.74M | ﹤0.01% |
9,300
-12,900
| -58% | -$3.98M |
|
1746
CALL
Calumet Specialty Products
CLMT
$3.63B
| $2.74M | ﹤0.01% |
216,300
-134,100
| -38% | -$2.11M |
|
1747
PUT
New Fortress Energy
NFE
$101M
| $2.74M | ﹤0.01% |
329,300
-280,900
| -46% | -$3.46M |
|
1748
CALL
ResMed
RMD
$28.3B
| $2.73M | ﹤0.01% |
12,200
-4,100
| -25% | -$957K |
|
1749
PUT
Carrier Global
CARR
$57.2B
| $2.73M | ﹤0.01% |
43,000
-114,000
| -73% | -$7.57M |
|
|
EMBJ
1750
CALL
Embraer S.A. ADS
EMBJ
$11.6B
| $2.73M | ﹤0.01% |
59,000
-2,700
| -4% | -$120K |
|
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.