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 | |
|---|---|---|---|---|---|---|
3826
PUT
Roper Technologies
ROP
$38.7B
| $498K | ﹤0.01% |
1,000
-400
| -29% | -$213K |
|
|
CEP
3827
DELISTED
Cantor Equity Partners
CEP
| $498K | ﹤0.01% |
22,272
-13,542
| -38% | -$352K |
|
3828
PUT
TechnipFMC
FTI
$28.9B
| $497K | ﹤0.01% |
12,600
+4,200
| +50% | +$154K |
|
3829
CALL
Target Hospitality
TH
$1.47B
| $497K | ﹤0.01% |
58,700
-60,500
| -51% | -$499K |
|
|
TBCH
3830
CALL
Turtle Beach Corp
TBCH
$258M
| $497K | ﹤0.01% |
31,300
+22,300
| +248% | +$331K |
|
|
RAPP
3831
Rapport Therapeutics
RAPP
$2.01B
| $496K | ﹤0.01% |
+16,730
| New | +$298K |
|
3832
CALL
Manulife Financial
MFC
$74.2B
| $495K | ﹤0.01% |
15,900
-24,300
| -60% | -$749K |
|
3833
PUT
Cardlytics
CDLX
$22.3M
| $494K | ﹤0.01% |
20,340
+17,550
| +629% | +$292K |
|
3834
CALL
Costamare
CMRE
$1.86B
| $494K | ﹤0.01% |
63,000
+38,700
| +159% | +$423K |
|
3835
Canadian Natural Resources
CNQ
$92.2B
| $494K | ﹤0.01% |
+15,478
| New | +$485K |
|
3836
PUT
Cerence
CRNC
$368M
| $494K | ﹤0.01% |
39,700
-44,400
| -53% | -$455K |
|
3837
PUT
Itaú Unibanco
ITUB
$91.6B
| $494K | ﹤0.01% |
69,422
-24,514
| -26% | -$162K |
|
3838
CALL
NNN REIT
NNN
$9.37B
| $493K | ﹤0.01% |
11,600
-5,500
| -32% | -$234K |
|
3839
Saia
SAIA
$10.9B
| $492K | ﹤0.01% |
1,645
-1,465
| -47% | -$442K |
|
3840
Under Armour Class C
UA
$2.97B
| $492K | ﹤0.01% |
101,872
+86,684
| +571% | +$485K |
|
|
OS
3841
CALL
DELISTED
OneStream Inc
OS
| $492K | ﹤0.01% |
26,700
-130,400
| -83% | -$2.86M |
|
3842
PUT
Donaldson
DCI
$11.1B
| $491K | ﹤0.01% |
6,000
-14,200
| -70% | -$1.07M |
|
3843
PUT
Mettler-Toledo International
MTD
$28.1B
| $491K | ﹤0.01% |
400
| – | – |
|
3844
PUT
Vermilion Energy
VET
$1.59B
| $491K | ﹤0.01% |
62,800
+21,800
| +53% | +$168K |
|
3845
Zymeworks
ZYME
$1.66B
| $491K | ﹤0.01% |
28,761
+22,316
| +346% | +$319K |
|
3846
CALL
Caleres
CAL
$447M
| $490K | ﹤0.01% |
37,600
+20,400
| +119% | +$295K |
|
3847
PUT
Everest Group
EG
$15.8B
| $490K | ﹤0.01% |
1,400
-5,900
| -81% | -$1.99M |
|
3848
PUT
TORM
TRMD
$3.05B
| $490K | ﹤0.01% |
23,800
-9,900
| -29% | -$199K |
|
|
OCFT
3849
CALL
DELISTED
OneConnect Financial Technology
OCFT
| $489K | ﹤0.01% |
64,600
+44,900
| +228% | +$330K |
|
3850
CALL
Reservoir Media
RSVR
$731M
| $489K | ﹤0.01% |
+60,100
| New | +$470K |
|
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.