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 |
Microsoft
MSFT
|
+$234M |
| 2 |
iShares Russell 2000 ETF
IWM
|
+$97.5M |
| 3 |
Amazon
AMZN
|
+$96.8M |
| 4 |
iShares Bitcoin Trust
IBIT
|
+$80.6M |
| 5 |
Pinduoduo
PDD
|
+$54.9M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$129M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$92.9M |
| 3 |
Broadcom
AVGO
|
+$82.9M |
| 4 |
Alphabet (Google) Class C
GOOG
|
+$68.4M |
| 5 |
Meta Platforms (Facebook)
META
|
+$59.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.79% |
| 2 | Consumer Discretionary | 0.3% |
| 3 | Healthcare | 0.25% |
| 4 | Financials | 0.17% |
| 5 | Industrials | 0.09% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
4226
Direxion Daily MSFT Bull 2X ETF
MSFU
$819M
| $363K | ﹤0.01% |
6,978
+3,472
| +99% | +$179K |
|
4227
Alaska Air
ALK
$5.11B
| $362K | ﹤0.01% |
7,272
-2,557
| -26% | -$142K |
|
4228
CALL
Crescent Energy
CRGY
$3.65B
| $362K | ﹤0.01% |
40,600
+7,900
| +24% | +$71.8K |
|
4229
PUT
Getty Images
GETY
$159M
| $362K | ﹤0.01% |
183,100
| – | – |
|
4230
PUT
Omeros
OMER
$845M
| $362K | ﹤0.01% |
88,500
+85,200
| +2,582% | +$338K |
|
|
SARO
4231
CALL
StandardAero Inc
SARO
$9.55B
| $362K | ﹤0.01% |
13,300
+8,000
| +151% | +$224K |
|
4232
PUT
Howard Hughes
HHH
$3.94B
| $361K | ﹤0.01% |
4,400
-30,200
| -87% | -$2.24M |
|
4233
CALL
Equitable Holdings
EQH
$13.2B
| $360K | ﹤0.01% |
7,100
-95,900
| -93% | -$5.08M |
|
4234
Gold Royalty Corp
GROY
$602M
| $360K | ﹤0.01% |
+93,456
| New | +$289K |
|
4235
PUT
Photronics
PLAB
$1.65B
| $360K | ﹤0.01% |
15,700
-102,000
| -87% | -$2.18M |
|
4236
CALL
Tetra Tech
TTEK
$8.77B
| $360K | ﹤0.01% |
10,800
-43,700
| -80% | -$1.59M |
|
4237
Ashland
ASH
$3.34B
| $359K | ﹤0.01% |
7,505
+1,579
| +27% | +$83K |
|
4238
CALL
Brixmor Property Group
BRX
$9.72B
| $359K | ﹤0.01% |
13,000
+300
| +2% | +$8.03K |
|
|
TDAY
4239
USA Today Co
TDAY
$1.29B
| $359K | ﹤0.01% |
+86,999
| New | +$350K |
|
|
PBT
4240
CALL
Permian Basin Royalty Trust
PBT
$1.36B
| $359K | ﹤0.01% |
19,700
+15,800
| +405% | +$246K |
|
4241
CALL
Essential Utilities
WTRG
$11.5B
| $359K | ﹤0.01% |
9,000
+7,400
| +463% | +$282K |
|
4242
BHP
BHP
$211B
| $358K | ﹤0.01% |
6,423
-22,268
| -78% | -$1.18M |
|
4243
CALL
BlueLinx
BXC
$430M
| $358K | ﹤0.01% |
4,900
+4,800
| +4,800% | +$378K |
|
4244
CALL
Dorman Products
DORM
$4.22B
| $358K | ﹤0.01% |
2,300
+500
| +28% | +$71.7K |
|
4245
Playtika
PLTK
$1.53B
| $358K | ﹤0.01% |
92,240
+56,075
| +155% | +$229K |
|
|
ASA
4246
CALL
ASA Gold and Precious Metals
ASA
$924M
| $357K | ﹤0.01% |
7,800
+5,000
| +179% | +$181K |
|
4247
CALL
AerSale
ASLE
$291M
| $357K | ﹤0.01% |
43,700
+2,500
| +6% | +$18.8K |
|
|
CMPS
4248
PUT
Compass Pathways
CMPS
$1.47B
| $357K | ﹤0.01% |
62,400
-86,100
| -58% | -$387K |
|
4249
CALL
LiveWire
LVWR
$530M
| $357K | ﹤0.01% |
75,300
-5,700
| -7% | -$23.2K |
|
4250
Mistras Group
MG
$477M
| $357K | ﹤0.01% |
36,339
+33,226
| +1,067% | +$296K |
|
Similar funds
Simplex Trading's Q3 2025 Portfolio in Review
As of Q3 2025, Simplex Trading held 10,358 positions worth $195B, up 12% from $175B the previous quarter. Its ten largest holdings account for 46% of the portfolio.
Simplex Trading's Q3 2025 filing shows 1,743 new, 3,828 increased, 3,250 reduced and 1,308 closed positions. Its largest new stake was Microsoft: 458,309 shares worth $237M. The largest sale was iShares 20+ Year Treasury Bond ETF, an estimated $129M.
By sector, the portfolio is most concentrated in Technology at 0.79% of assets, up from 0.74% a quarter earlier, followed by Consumer Discretionary and Healthcare.
- Simplex Trading's largest Q3 2025 buy was Microsoft: 458,309 shares worth $237M.
- Simplex Trading added most to iShares Russell 2000 ETF in Q3 2025, an estimated $97.5M increase.
- Simplex Trading's biggest Q3 2025 reduction was Alphabet (Google) Class A, cutting an estimated $92.9M.
- Simplex Trading fully exited iShares 20+ Year Treasury Bond ETF in Q3 2025, selling an estimated $129M.
- Simplex Trading's ten largest holdings make up 46% of its $195B portfolio in Q3 2025.
- Simplex Trading opened 1,743 new positions and closed 1,308 in Q3 2025.
- Simplex Trading's portfolio value rose 12% quarter-over-quarter to $195B.
Based on Simplex Trading's 13F filing for Q3 2025, filed 12 Nov 2025.