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 | |
|---|---|---|---|---|---|---|
|
SY
5651
So-Young International
SY
$185M
| $108K | ﹤0.01% |
28,138
-5,092
| -15% | -$21.6K |
|
|
TPH
5652
CALL
DELISTED
Tri Pointe Homes
TPH
| $108K | ﹤0.01% |
3,200
+1,800
| +129% | +$61.3K |
|
5653
CALL
TriMas Corp
TRS
$1.43B
| $108K | ﹤0.01% |
2,800
-2,400
| -46% | -$85.2K |
|
5654
Sixth Street Specialty
TSLX
$1.63B
| $108K | ﹤0.01% |
+4,764
| New | +$115K |
|
5655
PUT
Andersons Inc
ANDE
$2.41B
| $107K | ﹤0.01% |
2,700
+1,000
| +59% | +$38.5K |
|
5656
PUT
Driven Brands
DRVN
$2.35B
| $107K | ﹤0.01% |
6,700
+5,900
| +738% | +$103K |
|
5657
PUT
Essex Property Trust
ESS
$18.3B
| $107K | ﹤0.01% |
400
+200
| +100% | +$54.1K |
|
5658
PUT
GeoPark
GPRK
$633M
| $107K | ﹤0.01% |
16,800
+6,600
| +65% | +$43.5K |
|
5659
Laser Photonics
LASE
$49.2M
| $107K | ﹤0.01% |
+25,037
| New | +$80.9K |
|
|
PPIH
5660
PUT
Perma-Pipe International
PPIH
$196M
| $107K | ﹤0.01% |
+4,600
| New | +$119K |
|
5661
CALL
Reynolds Consumer Products
REYN
$5.26B
| $107K | ﹤0.01% |
+4,400
| New | +$99.6K |
|
|
5662
CALL
Sixth Street Specialty
TSLX
$1.63B
| $107K | ﹤0.01% |
4,700
-4,600
| -49% | -$111K |
|
5663
PUT
C4 Therapeutics
CCCC
$385M
| $106K | ﹤0.01% |
+47,800
| New | +$115K |
|
5664
CALL
Cardiff Oncology
CRDF
$66.5M
| $106K | ﹤0.01% |
51,900
-79,800
| -61% | -$221K |
|
5665
CALL
BlackRock US Equity Factor Rotation ETF
DYNF
$38.4B
| $106K | ﹤0.01% |
3,100
+2,400
| +343% | +$136K |
|
5666
H&R Block
HRB
$5.58B
| $106K | ﹤0.01% |
+2,108
| New | +$111K |
|
5667
PUT
OptimizeRx
OPRX
$114M
| $106K | ﹤0.01% |
+5,200
| New | +$82.5K |
|
5668
Relmada Therapeutics
RLMD
$557M
| $106K | ﹤0.01% |
53,082
+50,655
| +2,087% | +$48.6K |
|
|
ETU
5669
T-Rex 2X Long Ether Daily Target ETF
ETU
$10.8M
| $106K | ﹤0.01% |
3,126
+2,458
| +368% | +$81.3K |
|
5670
PUT
Arcutis Biotherapeutics
ARQT
$3.36B
| $105K | ﹤0.01% |
5,600
-2,400
| -30% | -$37.9K |
|
|
BRY
5671
PUT
DELISTED
Berry Corp
BRY
| $105K | ﹤0.01% |
27,800
+1,600
| +6% | +$5.18K |
|
5672
PUT
Columbia Banking Systems
COLB
$8.84B
| $105K | ﹤0.01% |
4,100
| – | – |
|
5673
Descartes Systems
DSGX
$6.44B
| $105K | ﹤0.01% |
+1,121
| New | +$115K |
|
5674
PUT
Global Partners
GLP
$1.68B
| $105K | ﹤0.01% |
+2,200
| New | +$113K |
|
5675
Garrett Motion
GTX
$5.81B
| $105K | ﹤0.01% |
7,770
+6,000
| +339% | +$76K |
|
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.