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 | |
|---|---|---|---|---|---|---|
2076
ODDITY Tech
ODD
$708M
| $1.91M | ﹤0.01% |
+44,058
| New | +$1.96M |
|
2077
CALL
Allegion
ALLE
$13B
| $1.9M | ﹤0.01% |
14,600
+13,500
| +1,227% | +$1.75M |
|
2078
PUT
Rithm Capital
RITM
$5.09B
| $1.9M | ﹤0.01% |
166,200
+42,600
| +34% | +$493K |
|
2079
CALL
Bank of Montreal
BMO
$125B
| $1.9M | ﹤0.01% |
19,900
-5,800
| -23% | -$574K |
|
2080
Direxion Daily S&P 500 Bear 3x ETF
SPXS
$332M
| $1.9M | ﹤0.01% |
+26,653
| New | +$1.68M |
|
2081
CALL
Modine Manufacturing
MOD
$12.8B
| $1.9M | ﹤0.01% |
24,700
+2,200
| +10% | +$217K |
|
2082
CALL
Aehr Test Systems
AEHR
$2.48B
| $1.89M | ﹤0.01% |
259,800
+157,800
| +155% | +$1.75M |
|
2083
CALL
DHT Holdings
DHT
$2.97B
| $1.89M | ﹤0.01% |
180,000
+34,700
| +24% | +$374K |
|
2084
CALL
HF Sinclair
DINO
$15.9B
| $1.89M | ﹤0.01% |
57,500
-46,500
| -45% | -$1.63M |
|
|
ARI
2085
Apollo Commercial Real Estate
ARI
$887M
| $1.89M | ﹤0.01% |
196,997
+168,776
| +598% | +$1.6M |
|
2086
CALL
Emcor
EME
$33.1B
| $1.89M | ﹤0.01% |
5,100
-2,600
| -34% | -$1.12M |
|
2087
CALL
Century Aluminum
CENX
$4.57B
| $1.88M | ﹤0.01% |
101,500
+18,000
| +22% | +$346K |
|
2088
PUT
Zeta Global
ZETA
$4.77B
| $1.88M | ﹤0.01% |
138,900
-276,500
| -67% | -$4.94M |
|
|
FLG
2089
Flagstar Bank National Association
FLG
$5.77B
| $1.88M | ﹤0.01% |
161,887
-229,799
| -59% | -$2.58M |
|
|
SKX
2090
CALL
DELISTED
Skechers
SKX
| $1.88M | ﹤0.01% |
33,100
+6,700
| +25% | +$436K |
|
2091
CALL
Elanco Animal Health
ELAN
$12.4B
| $1.87M | ﹤0.01% |
178,400
-99,900
| -36% | -$1.13M |
|
2092
PUT
Papa John's
PZZA
$999M
| $1.87M | ﹤0.01% |
45,600
-28,400
| -38% | -$1.21M |
|
2093
PUT
Casey's General Stores
CASY
$31.9B
| $1.87M | ﹤0.01% |
4,300
+700
| +19% | +$287K |
|
2094
CALL
Amkor Technology
AMKR
$16.1B
| $1.86M | ﹤0.01% |
103,000
+69,400
| +207% | +$1.57M |
|
2095
Magna International
MGA
$17.9B
| $1.86M | ﹤0.01% |
+54,618
| New | +$2.1M |
|
2096
CALL
Molson Coors Class B
TAP
$7.68B
| $1.86M | ﹤0.01% |
30,500
-32,500
| -52% | -$1.87M |
|
2097
PUT
First Citizens BancShares
FCNCA
$24.6B
| $1.85M | ﹤0.01% |
1,000
-5,800
| -85% | -$11.8M |
|
2098
CALL
Guidewire Software
GWRE
$11.5B
| $1.85M | ﹤0.01% |
9,900
-500
| -5% | -$97.2K |
|
2099
Simon Property Group
SPG
$74.5B
| $1.85M | ﹤0.01% |
11,162
+110
| +1% | +$19.2K |
|
|
VSXY
2100
PUT
Victoria's Secret
VSXY
$6.64B
| $1.85M | ﹤0.01% |
99,700
+16,700
| +20% | +$491K |
|
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.