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 | |
|---|---|---|---|---|---|---|
3326
iShares MSCI Mexico ETF
EWW
$1.91B
| $537K | ﹤0.01% |
10,541
+5,814
| +123% | +$293K |
|
3327
CALL
Lightbridge
LTBR
$263M
| $536K | ﹤0.01% |
71,900
+59,500
| +480% | +$529K |
|
3328
PUT
Ericsson
ERIC
$31.8B
| $535K | ﹤0.01% |
69,000
-137,400
| -67% | -$1.11M |
|
3329
CALL
Kinsale Capital Group
KNSL
$8.24B
| $535K | ﹤0.01% |
1,100
-1,400
| -56% | -$628K |
|
3330
PUT
Manulife Financial
MFC
$73.2B
| $535K | ﹤0.01% |
17,200
-1,400
| -8% | -$42.3K |
|
3331
PUT
Replimune Group
REPL
$724M
| $535K | ﹤0.01% |
+54,900
| New | +$679K |
|
3332
PUT
Antero Midstream
AM
$10.4B
| $534K | ﹤0.01% |
29,700
+13,800
| +87% | +$228K |
|
3333
PUT
Blue Owl Capital
OBDC
$5.42B
| $533K | ﹤0.01% |
36,400
-51,100
| -58% | -$768K |
|
3334
CALL
Fluence Energy
FLNC
$1.79B
| $532K | ﹤0.01% |
109,800
+15,300
| +16% | +$146K |
|
3335
CALL
United States Brent Oil Fund
BNO
$755M
| $531K | ﹤0.01% |
17,100
+13,100
| +328% | +$401K |
|
3336
CALL
Green Plains
GPRE
$1.15B
| $531K | ﹤0.01% |
109,600
-80,200
| -42% | -$575K |
|
3337
PUT
Iovance Biotherapeutics
IOVA
$2.19B
| $531K | ﹤0.01% |
159,500
-291,300
| -65% | -$1.5M |
|
3338
Joby Aviation
JOBY
$7.25B
| $531K | ﹤0.01% |
+88,251
| New | +$661K |
|
|
KC
3339
PUT
Kingsoft Cloud Holdings
KC
$2.97B
| $531K | ﹤0.01% |
37,000
+12,500
| +51% | +$187K |
|
|
SA
3340
Seabridge Gold
SA
$2.82B
| $531K | ﹤0.01% |
45,565
+29,091
| +177% | +$345K |
|
3341
PUT
Scholar Rock
SRRK
$5.86B
| $530K | ﹤0.01% |
16,500
-34,100
| -67% | -$1.31M |
|
|
3342
Fluence Energy
FLNC
$1.79B
| $529K | ﹤0.01% |
+109,244
| New | +$1.05M |
|
3343
Cimpress
CMPR
$2.41B
| $528K | ﹤0.01% |
11,685
+11,635
| +23,270% | +$654K |
|
|
FOLD
3344
DELISTED
Amicus Therapeutics
FOLD
| $527K | ﹤0.01% |
64,614
+53,957
| +506% | +$499K |
|
|
ETHU
3345
2x Ether ETF
ETHU
$784M
| $527K | ﹤0.01% |
14,386
+4,066
| +39% | +$373K |
|
3346
PUT
Acadia Pharmaceuticals
ACAD
$4.35B
| $526K | ﹤0.01% |
31,700
+8,800
| +38% | +$160K |
|
3347
CALL
Liberty Global Class C
LBTYK
$3.27B
| $526K | ﹤0.01% |
45,700
+15,600
| +52% | +$188K |
|
3348
CALL
Impinj
PI
$3.97B
| $526K | ﹤0.01% |
5,800
-2,100
| -27% | -$235K |
|
|
JKS
3349
PUT
JinkoSolar
JKS
$799M
| $525K | ﹤0.01% |
28,200
-23,100
| -45% | -$514K |
|
3350
ProShares Trust UltraShort Lehman 20+ Year Treasury
TBT
$294M
| $525K | ﹤0.01% |
15,609
-78,062
| -83% | -$2.76M |
|
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.