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 | |
|---|---|---|---|---|---|---|
|
SLVR
4501
Sprott Silver Miners & Physical Silver ETF
SLVR
$600M
| $291K | ﹤0.01% |
6,586
+5,757
| +694% | +$199K |
|
4502
PUT
Village Farms International
VFF
$240M
| $290K | ﹤0.01% |
92,900
+69,300
| +294% | +$150K |
|
4503
Vestis
VSTS
$1.97B
| $290K | ﹤0.01% |
64,227
+40,799
| +174% | +$209K |
|
|
DEFT
4504
PUT
Defi Technologies
DEFT
$151M
| $290K | ﹤0.01% |
+137,900
| New | +$357K |
|
4505
PUT
American Battery Technology Co
ABAT
$280M
| $288K | ﹤0.01% |
59,400
+56,900
| +2,276% | +$149K |
|
|
ACB
4506
Aurora Cannabis
ACB
$169M
| $288K | ﹤0.01% |
48,448
+26,383
| +120% | +$129K |
|
4507
CALL
Arlo Technologies
ARLO
$1.58B
| $288K | ﹤0.01% |
17,000
+5,800
| +52% | +$98.6K |
|
4508
PUT
Cabot Corp
CBT
$4.72B
| $288K | ﹤0.01% |
3,800
+3,000
| +375% | +$234K |
|
4509
CALL
Evergy
EVRG
$19.4B
| $288K | ﹤0.01% |
3,800
-2,600
| -41% | -$185K |
|
4510
PUT
Liberty Media Series A
FWONA
$23.4B
| $288K | ﹤0.01% |
2,800
+1,600
| +133% | +$146K |
|
4511
PUT
Babcock & Wilcox
BW
$1.18B
| $287K | ﹤0.01% |
99,000
-7,800
| -7% | -$13.8K |
|
4512
CALL
BeyondSpring
BYSI
$47.3M
| $287K | ﹤0.01% |
158,600
+6,600
| +4% | +$12.9K |
|
4513
CALL
Vaalco Energy
EGY
$562M
| $287K | ﹤0.01% |
71,500
+69,200
| +3,009% | +$267K |
|
4514
Magnolia Oil & Gas
MGY
$5.93B
| $287K | ﹤0.01% |
12,053
-3,048
| -20% | -$72.7K |
|
4515
CALL
Matrix Service
MTRX
$312M
| $287K | ﹤0.01% |
22,000
+17,400
| +378% | +$247K |
|
|
ABK
4516
PUT
DELISTED
Ambac Financial Group
ABK
| $287K | ﹤0.01% |
34,500
+16,900
| +96% | +$141K |
|
4517
Aquestive Therapeutics
AQST
$452M
| $286K | ﹤0.01% |
51,177
-369
| -0.7% | -$1.59K |
|
4518
Liberty Media Series C
FWONK
$25.5B
| $286K | ﹤0.01% |
+2,740
| New | +$278K |
|
4519
CALL
Ocugen
OCGN
$403M
| $286K | ﹤0.01% |
175,900
+46,400
| +36% | +$51.4K |
|
4520
CALL
Portland General Electric
POR
$5.82B
| $286K | ﹤0.01% |
6,500
+2,900
| +81% | +$122K |
|
4521
Invesco S&P 500 Top 50 ETF
XLG
$10.2B
| $286K | ﹤0.01% |
+4,979
| New | +$272K |
|
4522
Banco Bilbao Vizcaya Argentaria
BBVA
$142B
| $285K | ﹤0.01% |
14,840
+11,265
| +315% | +$197K |
|
4523
Galectin Therapeutics
GALT
$230M
| $285K | ﹤0.01% |
67,340
+22,646
| +51% | +$85.2K |
|
|
MTA
4524
Metalla Royalty & Streaming
MTA
$689M
| $285K | ﹤0.01% |
44,936
+12,112
| +37% | +$57.4K |
|
4525
CALL
Rentokil
RTO
$14.8B
| $285K | ﹤0.01% |
11,300
-4,300
| -28% | -$105K |
|
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.