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 | |
|---|---|---|---|---|---|---|
3226
CALL
Mid-America Apartment Communities
MAA
$15.5B
| $586K | ﹤0.01% |
3,500
+2,200
| +169% | +$348K |
|
3227
Regency Centers
REG
$15.1B
| $586K | ﹤0.01% |
+7,946
| New | +$578K |
|
3228
CALL
Advanced Drainage Systems
WMS
$11B
| $586K | ﹤0.01% |
5,400
+400
| +8% | +$46.6K |
|
3229
Axalta
AXTA
$7.22B
| $585K | ﹤0.01% |
17,647
+10,757
| +156% | +$382K |
|
3230
PUT
Commercial Metals
CMC
$7.53B
| $584K | ﹤0.01% |
12,700
+2,000
| +19% | +$97.3K |
|
3231
CALL
NNN REIT
NNN
$9.36B
| $584K | ﹤0.01% |
13,700
-11,700
| -46% | -$477K |
|
3232
CALL
Olin
OLN
$2.49B
| $584K | ﹤0.01% |
24,100
-60,000
| -71% | -$1.69M |
|
|
FBRT
3233
CALL
Franklin BSP Realty Trust
FBRT
$603M
| $583K | ﹤0.01% |
45,800
+18,800
| +70% | +$243K |
|
3234
Papa John's
PZZA
$997M
| $583K | ﹤0.01% |
14,208
-4,800
| -25% | -$205K |
|
3235
JetBlue
JBLU
$2.02B
| $582K | ﹤0.01% |
+120,947
| New | +$795K |
|
|
ACB
3236
PUT
Aurora Cannabis
ACB
$170M
| $581K | ﹤0.01% |
132,500
-675,700
| -84% | -$3.19M |
|
3237
Union Pacific
UNP
$178B
| $581K | ﹤0.01% |
2,463
-7,979
| -76% | -$1.92M |
|
3238
CALL
Agios Pharmaceuticals
AGIO
$2.2B
| $580K | ﹤0.01% |
19,800
+19,100
| +2,729% | +$634K |
|
3239
WisdomTree India Earnings Fund ETF
EPI
$2.03B
| $580K | ﹤0.01% |
+13,286
| New | +$570K |
|
3240
PUT
Cheesecake Factory
CAKE
$4.32B
| $579K | ﹤0.01% |
11,900
-6,500
| -35% | -$333K |
|
3241
CALL
Evercore
EVR
$13.2B
| $579K | ﹤0.01% |
2,900
-700
| -19% | -$174K |
|
3242
Fastly Inc
FSLY
$3.14B
| $578K | ﹤0.01% |
91,426
+46,070
| +102% | +$385K |
|
3243
CALL
Option Care Health
OPCH
$3.42B
| $576K | ﹤0.01% |
16,500
+5,800
| +54% | +$182K |
|
3244
PAR Technology
PAR
$682M
| $576K | ﹤0.01% |
+9,395
| New | +$630K |
|
3245
CALL
Thor Industries
THO
$3.98B
| $576K | ﹤0.01% |
7,600
-6,300
| -45% | -$592K |
|
3246
PUT
Western Union
WU
$2.55B
| $576K | ﹤0.01% |
54,500
+23,200
| +74% | +$246K |
|
3247
Sempra
SRE
$59.7B
| $575K | ﹤0.01% |
8,068
-16,485
| -67% | -$1.28M |
|
3248
Amneal Pharmaceuticals
AMRX
$5.78B
| $574K | ﹤0.01% |
68,549
+68,278
| +25,195% | +$570K |
|
3249
CALL
Getty Images
GETY
$173M
| $574K | ﹤0.01% |
332,300
+324,600
| +4,216% | +$772K |
|
3250
CALL
InMode
INMD
$884M
| $574K | ﹤0.01% |
32,400
-64,500
| -67% | -$1.16M |
|
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.