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 | |
|---|---|---|---|---|---|---|
5776
PUT
AudioEye
AEYE
$72.3M
| $49K | ﹤0.01% |
4,500
-9,100
| -67% | -$137K |
|
5777
Invesco Senior Loan ETF
BKLN
$6.97B
| $49K | ﹤0.01% |
2,396
-10,132
| -81% | -$212K |
|
5778
CALL
Boston Omaha
BOC
$428M
| $49K | ﹤0.01% |
3,400
+3,000
| +750% | +$43.1K |
|
5779
Collegium Pharmaceutical
COLL
$1.15B
| $49K | ﹤0.01% |
1,659
+894
| +117% | +$27.3K |
|
|
EFC
5780
PUT
Ellington Financial
EFC
$1.67B
| $49K | ﹤0.01% |
3,700
-1,700
| -31% | -$22K |
|
5781
PUT
Ero Copper
ERO
$2.81B
| $49K | ﹤0.01% |
4,100
-24,000
| -85% | -$320K |
|
|
GAMB
5782
DELISTED
Gambling.com
GAMB
| $49K | ﹤0.01% |
3,899
+3,459
| +786% | +$48.6K |
|
5783
Globant
GLOB
$1.58B
| $49K | ﹤0.01% |
+420
| New | +$75.3K |
|
5784
Global Partners
GLP
$1.68B
| $49K | ﹤0.01% |
+936
| New | +$50.6K |
|
5785
PUT
Immunome
IMNM
$2.58B
| $49K | ﹤0.01% |
7,300
-4,000
| -35% | -$38.4K |
|
5786
IPG Photonics
IPGP
$3.61B
| $49K | ﹤0.01% |
+778
| New | +$52.3K |
|
|
IRS
5787
CALL
IRSA Inversiones y Representaciones
IRS
$1.29B
| $49K | ﹤0.01% |
3,800
+2,800
| +280% | +$39.6K |
|
5788
PUT
Piper Sandler
PIPR
$5.12B
| $49K | ﹤0.01% |
+800
| New | +$57.3K |
|
5789
PUT
Radiant Logistics
RLGT
$386M
| $49K | ﹤0.01% |
8,000
+7,600
| +1,900% | +$51.5K |
|
5790
CALL
Stantec
STN
$8.04B
| $49K | ﹤0.01% |
+600
| New | +$48K |
|
5791
PUT
TransUnion
TRU
$15.1B
| $49K | ﹤0.01% |
600
+100
| +20% | +$9.13K |
|
5792
Zymeworks
ZYME
$1.61B
| $49K | ﹤0.01% |
4,168
+3,081
| +283% | +$42K |
|
5793
PUT
Amcor
AMCR
$20.8B
| $48K | ﹤0.01% |
1,000
-7,900
| -89% | -$389K |
|
5794
CALL
Donnelley Financial Solutions
DFIN
$1.18B
| $48K | ﹤0.01% |
+1,100
| New | +$60.9K |
|
5795
CALL
Digimarc Corp
DMRC
$147M
| $48K | ﹤0.01% |
3,800
-2,500
| -40% | -$71.5K |
|
5796
CALL
First Bancorp
FBNC
$2.6B
| $48K | ﹤0.01% |
1,200
+1,000
| +500% | +$42.2K |
|
5797
PUT
Glacier Bancorp
GBCI
$6.42B
| $48K | ﹤0.01% |
1,100
+1,000
| +1,000% | +$48.2K |
|
5798
CALL
Gilat Satellite Networks
GILT
$834M
| $48K | ﹤0.01% |
7,700
+7,500
| +3,750% | +$52.1K |
|
|
CBIO
5799
PUT
Crescent Biopharma
CBIO
$535M
| $48K | ﹤0.01% |
+2,287
| New | +$61.2K |
|
5800
iShares Latin America 40 ETF
ILF
$3.85B
| $48K | ﹤0.01% |
2,073
+1,638
| +377% | +$37.6K |
|
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.