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 | |
|---|---|---|---|---|---|---|
6251
PUT
Sumitomo Mitsui Financial
SMFG
$159B
| $30K | ﹤0.01% |
2,000
-200
| -9% | -$3.04K |
|
6252
PUT
Teekay
TK
$996M
| $30K | ﹤0.01% |
4,700
-9,400
| -67% | -$65K |
|
|
TMHC
6253
CALL
DELISTED
Taylor Morrison
TMHC
| $30K | ﹤0.01% |
500
-4,000
| -89% | -$249K |
|
6254
Tennant Co
TNC
$1.44B
| $30K | ﹤0.01% |
386
-3,137
| -89% | -$265K |
|
|
TESL
6255
Simplify Volt TSLA Revolution ETF
TESL
$13M
| $30K | ﹤0.01% |
+1,901
| New | +$37K |
|
6256
PUT
A10 Networks
ATEN
$2.07B
| $29K | ﹤0.01% |
1,800
+1,700
| +1,700% | +$32.6K |
|
|
AZEK
6257
PUT
DELISTED
The AZEK Co
AZEK
| $29K | ﹤0.01% |
600
-4,200
| -88% | -$199K |
|
|
BELFB
6258
CALL
Bel Fuse Inc Class B
BELFB
$3.45B
| $29K | ﹤0.01% |
400
| – | – |
|
6259
CALL
Cadre Holdings
CDRE
$1.31B
| $29K | ﹤0.01% |
+1,000
| New | +$34.4K |
|
6260
PUT
Cullinan Oncology
CGEM
$1.06B
| $29K | ﹤0.01% |
3,900
+100
| +3% | +$960 |
|
6261
Casella Waste Systems
CWST
$5.76B
| $29K | ﹤0.01% |
+266
| New | +$29.1K |
|
6262
PUT
Krispy Kreme
DNUT
$562M
| $29K | ﹤0.01% |
6,000
-28,600
| -83% | -$218K |
|
6263
CALL
Emergent Biosolutions
EBS
$379M
| $29K | ﹤0.01% |
6,100
-78,600
| -93% | -$651K |
|
|
EU
6264
enCore Energy
EU
$206M
| $29K | ﹤0.01% |
21,423
-19,883
| -48% | -$51.1K |
|
6265
CALL
Fomento Económico Mexicano
FMX
$41.2B
| $29K | ﹤0.01% |
300
| – | – |
|
6266
CALL
FingerMotion
FNGR
$14.8M
| $29K | ﹤0.01% |
21,500
+13,900
| +183% | +$17.9K |
|
6267
PUT
CGI
GIB
$15.4B
| $29K | ﹤0.01% |
+300
| New | +$32.9K |
|
6268
CALL
Janus Henderson Small Cap Growth Alpha ETF
JSML
$355M
| $29K | ﹤0.01% |
600
+500
| +500% | +$32.5K |
|
6269
PUT
Kingstone Companies
KINS
$295M
| $29K | ﹤0.01% |
+1,800
| New | +$28.7K |
|
6270
PUT
MediWound
MDWD
$184M
| $29K | ﹤0.01% |
1,900
-300
| -14% | -$5.37K |
|
6271
Madison Square Garden
MSGE
$3.59B
| $29K | ﹤0.01% |
+897
| New | +$31.3K |
|
6272
Passage Bio
PASG
$14.5M
| $29K | ﹤0.01% |
4,117
+4,088
| +14,097% | +$44.2K |
|
|
RPC
6273
CALL
Ridgepost Capital
RPC
$926M
| $29K | ﹤0.01% |
2,500
-6,900
| -73% | -$87.7K |
|
6274
PUT
Gibraltar Industries
ROCK
$1.28B
| $29K | ﹤0.01% |
+500
| New | +$31.1K |
|
6275
SITE Centers
SITC
$236M
| $29K | ﹤0.01% |
2,270
+526
| +30% | +$7.49K |
|
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.