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 | |
|---|---|---|---|---|---|---|
|
EFC
4351
PUT
Ellington Financial
EFC
$1.69B
| $327K | ﹤0.01% |
25,200
-100
| -0.4% | -$1.33K |
|
4352
Akamai
AKAM
$15.6B
| $326K | ﹤0.01% |
4,315
-19,653
| -82% | -$1.51M |
|
4353
CALL
Arhaus
ARHS
$1.07B
| $326K | ﹤0.01% |
30,700
+23,900
| +351% | +$252K |
|
4354
CALL
ARKO Corp
ARKO
$868M
| $326K | ﹤0.01% |
+71,400
| New | +$337K |
|
4355
PUT
Peoples Bancorp
PEBO
$1.51B
| $326K | ﹤0.01% |
10,900
+4,300
| +65% | +$130K |
|
4356
CALL
Packaging Corp of America
PKG
$22.2B
| $326K | ﹤0.01% |
1,500
+900
| +150% | +$186K |
|
4357
PUT
WisdomTree US Total Dividend Fund
DTD
$1.64B
| $325K | ﹤0.01% |
3,400
+700
| +26% | +$57.4K |
|
|
LAZR
4358
PUT
DELISTED
Luminar Technologies
LAZR
| $325K | ﹤0.01% |
170,500
+46,600
| +38% | +$114K |
|
4359
PUT
Polestar Automotive Holding UK
PSNY
$1.97B
| $325K | ﹤0.01% |
11,537
-6,050
| -34% | -$194K |
|
4360
Ameriprise Financial
AMP
$47.8B
| $324K | ﹤0.01% |
660
-547
| -45% | -$280K |
|
4361
CALL
Pampa Energía
PAM
$4.57B
| $324K | ﹤0.01% |
5,400
+5,200
| +2,600% | +$359K |
|
4362
Alpha Metallurgical Resources
AMR
$1.77B
| $323K | ﹤0.01% |
1,970
-5,076
| -72% | -$704K |
|
4363
CALL
Astronics
ATRO
$3.21B
| $323K | ﹤0.01% |
8,520
+4,800
| +129% | +$146K |
|
4364
CALL
BlackLine
BL
$1.9B
| $323K | ﹤0.01% |
6,100
+2,800
| +85% | +$151K |
|
4365
CALL
Dole
DOLE
$1.38B
| $323K | ﹤0.01% |
24,100
+22,500
| +1,406% | +$316K |
|
4366
Entegris
ENTG
$16.3B
| $323K | ﹤0.01% |
3,501
-21,689
| -86% | -$1.85M |
|
4367
CALL
FB Financial Corp
FBK
$2.98B
| $323K | ﹤0.01% |
5,800
+5,300
| +1,060% | +$269K |
|
4368
PUT
Visteon
VC
$2.85B
| $323K | ﹤0.01% |
2,700
| – | – |
|
|
HI
4369
DELISTED
Hillenbrand
HI
| $322K | ﹤0.01% |
+11,945
| New | +$280K |
|
4370
CALL
Kulicke & Soffa
KLIC
$4.34B
| $321K | ﹤0.01% |
7,900
+5,000
| +172% | +$185K |
|
4371
CALL
Tradeweb Markets
TW
$23B
| $321K | ﹤0.01% |
2,900
-22,700
| -89% | -$2.92M |
|
|
PRO
4372
CALL
DELISTED
PROS Holdings
PRO
| $320K | ﹤0.01% |
14,000
+2,200
| +19% | +$35.8K |
|
|
FLNA
4373
PUT
Filana Therapeutics
FLNA
$42M
| $320K | ﹤0.01% |
110,200
+29,000
| +36% | +$66.7K |
|
|
AIV
4374
PUT
Aimco
AIV
$377M
| $319K | ﹤0.01% |
40,300
+38,500
| +2,139% | +$313K |
|
4375
CALL
GCM Grosvenor
GCMG
$737M
| $319K | ﹤0.01% |
26,500
-42,700
| -62% | -$529K |
|
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.