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 | |
|---|---|---|---|---|---|---|
3276
PUT
Pilgrim's Pride
PPC
$6.94B
| $561K | ﹤0.01% |
10,300
-54,500
| -84% | -$2.73M |
|
3277
PUT
Arrowhead Research
ARWR
$12B
| $560K | ﹤0.01% |
44,000
+27,600
| +168% | +$502K |
|
3278
First Trust Natural Gas ETF
FCG
$617M
| $560K | ﹤0.01% |
22,551
+20,645
| +1,083% | +$516K |
|
3279
PUT
Patterson-UTI
PTEN
$3.57B
| $560K | ﹤0.01% |
68,200
-96,700
| -59% | -$811K |
|
3280
PUT
TAL Education Group
TAL
$5.86B
| $560K | ﹤0.01% |
42,400
-61,200
| -59% | -$763K |
|
3281
CALL
Virtu Financial
VIRT
$5.12B
| $560K | ﹤0.01% |
14,700
-83,100
| -85% | -$3.09M |
|
3282
Academy Sports + Outdoors
ASO
$3.09B
| $559K | ﹤0.01% |
12,261
+8,040
| +190% | +$413K |
|
3283
Celestica
CLS
$36.6B
| $559K | ﹤0.01% |
+7,105
| New | +$754K |
|
3284
Manchester United
MANU
$3.96B
| $559K | ﹤0.01% |
42,743
+15,629
| +58% | +$236K |
|
3285
PUT
Enviri
NVRI
$620M
| $559K | ﹤0.01% |
84,200
+57,000
| +210% | +$448K |
|
3286
CALL
Saia
SAIA
$11.2B
| $559K | ﹤0.01% |
1,600
-900
| -36% | -$391K |
|
|
CIM
3287
Chimera Investment
CIM
$1.05B
| $558K | ﹤0.01% |
+43,557
| New | +$612K |
|
3288
PUT
InterDigital
IDCC
$6.7B
| $558K | ﹤0.01% |
2,700
-4,900
| -64% | -$986K |
|
|
HTT
3289
PUT
High Templar Tech Ltd
HTT
$376M
| $558K | ﹤0.01% |
207,700
+187,100
| +908% | +$529K |
|
3290
ProShares Ultra Gold
UGL
$661M
| $558K | ﹤0.01% |
+17,340
| New | +$477K |
|
|
SW
3291
CALL
Smurfit Westrock
SW
$26.3B
| $558K | ﹤0.01% |
12,400
-100
| -0.8% | -$5.07K |
|
3292
Alaska Air
ALK
$5.3B
| $557K | ﹤0.01% |
+11,331
| New | +$744K |
|
3293
PUT
Canadian Imperial Bank of Commerce
CM
$108B
| $557K | ﹤0.01% |
9,900
+2,400
| +32% | +$145K |
|
3294
SL Green Realty
SLG
$3.83B
| $557K | ﹤0.01% |
9,664
+3,690
| +62% | +$233K |
|
|
TBCH
3295
PUT
Turtle Beach Corp
TBCH
$245M
| $557K | ﹤0.01% |
39,100
+2,600
| +7% | +$43.3K |
|
3296
CALL
First Citizens BancShares
FCNCA
$24.3B
| $556K | ﹤0.01% |
300
-1,800
| -86% | -$3.67M |
|
3297
PUT
Old Republic International
ORI
$10.5B
| $556K | ﹤0.01% |
14,200
+8,600
| +154% | +$315K |
|
3298
CALL
Polestar Automotive Holding UK
PSNY
$2.04B
| $556K | ﹤0.01% |
17,657
-2,856
| -14% | -$94.3K |
|
3299
Immersion
IMMR
$256M
| $555K | ﹤0.01% |
73,300
+64,016
| +690% | +$525K |
|
3300
CALL
Beam Therapeutics
BEAM
$2.58B
| $554K | ﹤0.01% |
28,400
+17,000
| +149% | +$445K |
|
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.