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 | |
|---|---|---|---|---|---|---|
2951
CALL
Kodak
KODK
$806M
| $774K | ﹤0.01% |
122,500
+7,800
| +7% | +$54.2K |
|
|
HOLX
2952
DELISTED
Hologic
HOLX
| $773K | ﹤0.01% |
12,524
-5,858
| -32% | -$388K |
|
|
ECHO
2953
EchoStar
ECHO
$25.5B
| $773K | ﹤0.01% |
+30,226
| New | +$822K |
|
2954
CALL
STAG Industrial
STAG
$7.86B
| $769K | ﹤0.01% |
21,300
+20,800
| +4,160% | +$725K |
|
|
CMRX
2955
DELISTED
Chimerix, Inc.
CMRX
| $768K | ﹤0.01% |
90,361
+45,675
| +102% | +$252K |
|
2956
CALL
Cirrus Logic
CRUS
$6.74B
| $767K | ﹤0.01% |
7,700
-1,400
| -15% | -$144K |
|
2957
CALL
Outset Medical
OM
$74.9M
| $766K | ﹤0.01% |
69,300
+64,573
| +1,366% | +$770K |
|
2958
CALL
Photronics
PLAB
$1.79B
| $766K | ﹤0.01% |
36,900
+28,300
| +329% | +$630K |
|
2959
PUT
Roper Technologies
ROP
$36.3B
| $766K | ﹤0.01% |
1,300
-3,200
| -71% | -$1.8M |
|
2960
PUT
Ocular Therapeutix
OCUL
$1.86B
| $765K | ﹤0.01% |
104,400
+13,900
| +15% | +$107K |
|
2961
CALL
Vanguard Total Bond Market
BND
$157B
| $764K | ﹤0.01% |
10,400
+600
| +6% | +$43.5K |
|
2962
CALL
Pegasystems
PEGA
$4.41B
| $764K | ﹤0.01% |
22,000
+11,200
| +104% | +$495K |
|
2963
CALL
Mueller Industries
MLI
$14.1B
| $761K | ﹤0.01% |
20,000
+4,000
| +25% | +$160K |
|
2964
PUT
West Pharmaceutical
WST
$23.1B
| $761K | ﹤0.01% |
3,400
+2,900
| +580% | +$799K |
|
|
HTGCR
2965
PUT
DELISTED
HERCULES TECHNOLOGY GROWTH CAP INC TRANS RGTS TO PUR COM STK
HTGCR
| $760K | ﹤0.01% |
39,600
-1,300
| -3% | -$24.9K |
|
|
AISP
2966
CALL
Airship AI Holdings
AISP
$69.2M
| $759K | ﹤0.01% |
196,800
+66,100
| +51% | +$307K |
|
2967
Fabrinet
FN
$17.1B
| $758K | ﹤0.01% |
3,842
-1,481
| -28% | -$323K |
|
2968
CALL
Kymera Therapeutics
KYMR
$9.1B
| $758K | ﹤0.01% |
27,700
+24,400
| +739% | +$889K |
|
|
DOO
2969
PUT
Bombardier Recreational Products
DOO
$4.43B
| $757K | ﹤0.01% |
22,400
+21,900
| +4,380% | +$963K |
|
2970
CALL
Satellogic
SATL
$532M
| $757K | ﹤0.01% |
212,200
-12,200
| -5% | -$41K |
|
2971
Lumentum
LITE
$59.4B
| $756K | ﹤0.01% |
+12,134
| New | +$934K |
|
|
NVRO
2972
DELISTED
NEVRO CORP.
NVRO
| $756K | ﹤0.01% |
129,605
+69,550
| +116% | +$366K |
|
|
CYBR
2973
DELISTED
CyberArk
CYBR
| $754K | ﹤0.01% |
2,232
+2,150
| +2,622% | +$773K |
|
2974
CALL
Nabors Industries
NBR
$1.23B
| $754K | ﹤0.01% |
18,100
+7,300
| +68% | +$372K |
|
|
SAFE
2975
CALL
Safehold
SAFE
$1.19B
| $754K | ﹤0.01% |
40,300
+37,600
| +1,393% | +$660K |
|
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.