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 | |
|---|---|---|---|---|---|---|
|
CAN
4151
CALL
Canaan Creative
CAN
$172M
| $387K | ﹤0.01% |
438,900
+135,100
| +44% | +$103K |
|
4152
Verra Mobility
VRRM
$775M
| $387K | ﹤0.01% |
15,675
+7,418
| +90% | +$183K |
|
|
QVCGA
4153
PUT
DELISTED
QVC Group Inc Series A
QVCGA
| $387K | ﹤0.01% |
+28,700
| New | +$187K |
|
4154
PUT
Arrowhead Research
ARWR
$12.1B
| $386K | ﹤0.01% |
11,200
-54,300
| -83% | -$1.19M |
|
|
CIM
4155
CALL
Chimera Investment
CIM
$1.06B
| $386K | ﹤0.01% |
29,200
-280,200
| -91% | -$3.9M |
|
|
ACLX
4156
CALL
DELISTED
Arcellx
ACLX
| $385K | ﹤0.01% |
4,700
+2,500
| +114% | +$180K |
|
4157
PUT
Eledon Pharmaceuticals
ELDN
$255M
| $385K | ﹤0.01% |
148,700
+127,400
| +598% | +$372K |
|
4158
FTAI Infrastructure
FIP
$447M
| $385K | ﹤0.01% |
88,449
-56,470
| -39% | -$306K |
|
4159
CALL
Prospect Capital
PSEC
$1.08B
| $384K | ﹤0.01% |
139,800
+43,600
| +45% | +$130K |
|
4160
CALL
Lightwave Logic
LWLG
$823M
| $383K | ﹤0.01% |
103,400
+92,200
| +823% | +$238K |
|
4161
ConocoPhillips
COP
$144B
| $382K | ﹤0.01% |
+4,039
| New | +$382K |
|
4162
CALL
Rezolute
RZLT
$453M
| $382K | ﹤0.01% |
40,700
+11,100
| +38% | +$73.9K |
|
4163
PUT
Bumble
BMBL
$387M
| $381K | ﹤0.01% |
62,600
-142,500
| -69% | -$973K |
|
4164
PUT
Imperial Oil
IMO
$62.3B
| $381K | ﹤0.01% |
4,200
-35,200
| -89% | -$3.04M |
|
4165
CALL
Arbutus Biopharma
ABUS
$847M
| $380K | ﹤0.01% |
83,900
+70,300
| +517% | +$258K |
|
4166
St. Joe Company
JOE
$3.55B
| $380K | ﹤0.01% |
+7,692
| New | +$388K |
|
4167
CALL
Atlanta Braves Holdings Series B
BATRK
$3.28B
| $379K | ﹤0.01% |
9,000
+3,200
| +55% | +$141K |
|
4168
CALL
3D Systems Corp
DDD
$405M
| $379K | ﹤0.01% |
130,700
+116,200
| +801% | +$239K |
|
4169
CALL
Invesco CurrencyShares Euro Currency Trust
FXE
$344M
| $379K | ﹤0.01% |
3,500
-26,100
| -88% | -$2.81M |
|
4170
PUT
Willis Towers Watson
WTW
$29.8B
| $379K | ﹤0.01% |
1,100
-500
| -31% | -$162K |
|
4171
CALL
Woodward
WWD
$23B
| $379K | ﹤0.01% |
1,500
-900
| -38% | -$224K |
|
4172
CALL
Structure Therapeutics
GPCR
$3.37B
| $378K | ﹤0.01% |
13,500
+7,200
| +114% | +$143K |
|
4173
Nano X Imaging
NNOX
$61.1M
| $378K | ﹤0.01% |
102,220
+95,253
| +1,367% | +$424K |
|
4174
Procter & Gamble
PG
$340B
| $378K | ﹤0.01% |
+2,464
| New | +$385K |
|
|
BZAI
4175
CALL
Blaize Holdings
BZAI
$108M
| $378K | ﹤0.01% |
109,800
+90,600
| +472% | +$322K |
|
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.