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 | |
|---|---|---|---|---|---|---|
6476
PUT
Fomento Económico Mexicano
FMX
$41.2B
| $49K | ﹤0.01% |
500
-8,000
| -94% | -$743K |
|
6477
CALL
Graham Corp
GHM
$1.03B
| $49K | ﹤0.01% |
900
+800
| +800% | +$40.9K |
|
|
HTBK
6478
PUT
DELISTED
Heritage Commerce
HTBK
| $49K | ﹤0.01% |
5,000
+4,400
| +733% | +$44.2K |
|
6479
PUT
Lincoln Educational Services
LINC
$1.38B
| $49K | ﹤0.01% |
2,100
+2,000
| +2,000% | +$42.9K |
|
6480
PUT
Lexicon Pharmaceuticals
LXRX
$1.03B
| $49K | ﹤0.01% |
+37,000
| New | +$42K |
|
6481
PUT
Lloyds Banking Group
LYG
$85.2B
| $49K | ﹤0.01% |
10,900
+4,900
| +82% | +$21.4K |
|
|
SEE
6482
PUT
DELISTED
Sealed Air
SEE
| $49K | ﹤0.01% |
1,400
-200
| -13% | -$6.38K |
|
|
SVC
6483
PUT
Service Properties Trust
SVC
$1.05B
| $49K | ﹤0.01% |
3,680
-60
| -2% | -$813 |
|
|
KQQQ
6484
CALL
Kurv Technology Titans Select ETF
KQQQ
$117M
| $49K | ﹤0.01% |
1,800
+400
| +29% | +$11.3K |
|
|
ALE
6485
DELISTED
Allete
ALE
| $48K | ﹤0.01% |
+733
| New | +$47.6K |
|
6486
PUT
Allegiant Air
ALGT
$2.57B
| $48K | ﹤0.01% |
800
-100
| -11% | -$5.74K |
|
6487
CALL
ArcBest
ARCB
$3.16B
| $48K | ﹤0.01% |
700
+300
| +75% | +$22.6K |
|
6488
CALL
Columbia Banking Systems
COLB
$8.71B
| $48K | ﹤0.01% |
1,900
-10,400
| -85% | -$264K |
|
6489
GraniteShares 2x Long COIN Daily ETF
CONL
$485M
| $48K | ﹤0.01% |
+1,303
| New | +$53.3K |
|
|
HELP
6490
Cybin Inc
HELP
$490M
| $48K | ﹤0.01% |
+8,236
| New | +$58.4K |
|
6491
Digimarc Corp
DMRC
$143M
| $48K | ﹤0.01% |
4,993
+4,822
| +2,820% | +$52K |
|
6492
Five Point Holdings
FPH
$387M
| $48K | ﹤0.01% |
7,916
-2,264
| -22% | -$13.1K |
|
6493
PUT
HighPeak Energy
HPK
$838M
| $48K | ﹤0.01% |
6,900
+5,600
| +431% | +$46.1K |
|
6494
PUT
Horizon Technology Finance
HRZN
$294M
| $48K | ﹤0.01% |
7,900
+1,500
| +23% | +$10.9K |
|
6495
CALL
Materion
MTRN
$3.94B
| $48K | ﹤0.01% |
+400
| New | +$42K |
|
6496
Mitsubishi UFJ Financial
MUFG
$247B
| $48K | ﹤0.01% |
+3,060
| New | +$45.3K |
|
6497
Oportun Financial
OPRT
$262M
| $48K | ﹤0.01% |
7,924
-64,634
| -89% | -$416K |
|
6498
Outdoor Holding Co
POWW
$249M
| $48K | ﹤0.01% |
32,790
+32,044
| +4,295% | +$42.7K |
|
6499
Radware
RDWR
$983M
| $48K | ﹤0.01% |
1,820
-1,742
| -49% | -$46.5K |
|
6500
PUT
Ryanair
RYAAY
$30B
| $48K | ﹤0.01% |
800
-5,700
| -88% | -$347K |
|
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.