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 | |
|---|---|---|---|---|---|---|
3026
CALL
Sonos
SONO
$1.87B
| $1.02M | ﹤0.01% |
64,500
+39,400
| +157% | +$506K |
|
3027
CALL
Avantor
AVTR
$8.03B
| $1.01M | ﹤0.01% |
81,400
-105,000
| -56% | -$1.35M |
|
3028
PUT
Star Bulk Carriers
SBLK
$3.02B
| $1.01M | ﹤0.01% |
54,600
-79,700
| -59% | -$1.5M |
|
3029
PUT
First Interstate BancSystem
FIBK
$3.67B
| $1.01M | ﹤0.01% |
31,800
+100
| +0.3% | +$3.11K |
|
3030
PUT
Global Ship Lease
GSL
$1.55B
| $1.01M | ﹤0.01% |
33,000
+18,100
| +121% | +$539K |
|
3031
CALL
Masco
MAS
$16.4B
| $1.01M | ﹤0.01% |
14,400
-22,600
| -61% | -$1.59M |
|
3032
PUT
Louisiana-Pacific
LPX
$5.19B
| $1.01M | ﹤0.01% |
11,400
-2,600
| -19% | -$240K |
|
|
CHYM
3033
CALL
Chime Financial
CHYM
$8.33B
| $1.01M | ﹤0.01% |
50,100
-9,400
| -16% | -$267K |
|
3034
Clorox
CLX
$11.8B
| $1.01M | ﹤0.01% |
8,188
+6,166
| +305% | +$765K |
|
3035
PUT
J.M. Smucker
SJM
$12.9B
| $1.01M | ﹤0.01% |
9,300
-26,600
| -74% | -$2.89M |
|
3036
Nordic American Tanker
NAT
$1.37B
| $1.01M | ﹤0.01% |
321,093
+148,595
| +86% | +$439K |
|
3037
CALL
Crinetics Pharmaceuticals
CRNX
$8.87B
| $1.01M | ﹤0.01% |
24,200
+23,400
| +2,925% | +$748K |
|
|
HBI
3038
CALL
DELISTED
Hanesbrands
HBI
| $1.01M | ﹤0.01% |
152,900
-173,700
| -53% | -$960K |
|
3039
CALL
Precigen
PGEN
$1.93B
| $1.01M | ﹤0.01% |
306,300
+192,300
| +169% | +$543K |
|
3040
Grand Canyon Education
LOPE
$3.84B
| $1.01M | ﹤0.01% |
+4,584
| New | +$881K |
|
3041
PUT
Warrior Met Coal
HCC
$4.26B
| $1M | ﹤0.01% |
15,800
-21,100
| -57% | -$1.21M |
|
|
APLS
3042
PUT
DELISTED
Apellis Pharmaceuticals
APLS
| $1M | ﹤0.01% |
44,400
+5,700
| +15% | +$133K |
|
3043
NextNav
NN
$1.73B
| $1M | ﹤0.01% |
70,278
+40,466
| +136% | +$639K |
|
3044
Albemarle
ALB
$13.7B
| $1M | ﹤0.01% |
+12,365
| New | +$954K |
|
|
FISV
3045
Fiserv Inc
FISV
$27.9B
| $1M | ﹤0.01% |
7,759
-10,440
| -57% | -$1.5M |
|
|
SEPN
3046
PUT
Septerna Inc
SEPN
$1.51B
| $998K | ﹤0.01% |
53,100
-45,500
| -46% | -$597K |
|
3047
Funko
FNKO
$342M
| $997K | ﹤0.01% |
289,870
+162,817
| +128% | +$604K |
|
|
MESO
3048
CALL
Mesoblast
MESO
$1.89B
| $997K | ﹤0.01% |
61,900
+29,200
| +89% | +$427K |
|
3049
ProShares Bitcoin Strategy ETF
BITO
$1.42B
| $996K | ﹤0.01% |
+50,620
| New | +$1.06M |
|
3050
CALL
DoubleVerify
DV
$1.68B
| $996K | ﹤0.01% |
83,200
+54,700
| +192% | +$811K |
|
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.