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 | |
|---|---|---|---|---|---|---|
5701
PUT
Stock Yards Bancorp
SYBT
$2.64B
| $104K | ﹤0.01% |
1,500
| – | – |
|
5702
PUT
Arcosa
ACA
$7.13B
| $103K | ﹤0.01% |
1,100
+200
| +22% | +$18.6K |
|
5703
PUT
Aldeyra Therapeutics
ALDX
$92.9M
| $103K | ﹤0.01% |
19,900
+16,000
| +410% | +$83.4K |
|
|
API
5704
CALL
Agora
API
$337M
| $103K | ﹤0.01% |
27,000
+25,400
| +1,588% | +$95.8K |
|
5705
CALL
Aveanna Healthcare
AVAH
$2.04B
| $103K | ﹤0.01% |
+11,700
| New | +$74K |
|
5706
CALL
A2Z Smart Technologies
AZ
$274M
| $103K | ﹤0.01% |
12,900
+6,300
| +95% | +$59.7K |
|
5707
CALL
Clearwater Paper
CLW
$339M
| $103K | ﹤0.01% |
5,000
+1,700
| +52% | +$41.1K |
|
5708
Caledonia Mining Corp
CMCL
$355M
| $103K | ﹤0.01% |
2,858
+2,856
| +142,800% | +$72.6K |
|
5709
PUT
Descartes Systems
DSGX
$6.44B
| $103K | ﹤0.01% |
1,100
-900
| -45% | -$92K |
|
5710
CALL
Gaotu Techedu
GOTU
$434M
| $103K | ﹤0.01% |
31,700
-5,700
| -15% | -$20.7K |
|
5711
PUT
Kopin
KOPN
$652M
| $103K | ﹤0.01% |
42,700
+600
| +1% | +$1.22K |
|
5712
PUT
Leggett & Platt
LEG
$1.34B
| $103K | ﹤0.01% |
11,700
-8,700
| -43% | -$82.9K |
|
5713
PUT
National Health Investors
NHI
$3.72B
| $103K | ﹤0.01% |
1,300
-2,900
| -69% | -$217K |
|
5714
CALL
POSCO
PKX
$16.1B
| $103K | ﹤0.01% |
2,100
-200
| -9% | -$10.8K |
|
5715
CALL
Pinnacle Financial Partners Inc
PNFP
$15.9B
| $103K | ﹤0.01% |
1,100
-2,800
| -72% | -$280K |
|
|
RC
5716
Ready Capital
RC
$258M
| $103K | ﹤0.01% |
26,786
+21,815
| +439% | +$92.1K |
|
5717
PUT
Snap-on
SNA
$21.2B
| $103K | ﹤0.01% |
+300
| New | +$98.2K |
|
5718
CALL
Sensient Technologies
SXT
$5.26B
| $103K | ﹤0.01% |
+1,100
| New | +$120K |
|
5719
CALL
Willis Towers Watson
WTW
$31.2B
| $103K | ﹤0.01% |
300
| – | – |
|
|
TSSI
5720
TSS Inc
TSSI
$278M
| $103K | ﹤0.01% |
+5,714
| New | +$114K |
|
5721
CALL
Advanced Energy
AEIS
$11.6B
| $102K | ﹤0.01% |
600
-2,600
| -81% | -$391K |
|
5722
State Street SPDR Bloomberg 1-3 Month T-Bill ETF
BIL
$47.1B
| $102K | ﹤0.01% |
1,112
-496
| -31% | -$45.4K |
|
5723
PUT
Brookfield Infrastructure
BIPC
$5.2B
| $102K | ﹤0.01% |
2,500
-2,300
| -48% | -$93.2K |
|
5724
CALL
Coherus Oncology
CHRS
$217M
| $102K | ﹤0.01% |
62,700
+17,100
| +38% | +$19K |
|
5725
PUT
Fortive
FTV
$17.9B
| $102K | ﹤0.01% |
2,100
+1,700
| +425% | +$83.8K |
|
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.