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 | |
|---|---|---|---|---|---|---|
26
PUT
Netflix
NFLX
$286B
| $1.08B | 0.55% |
9,175,000
-13,406,000
| -59% | -$1.64B |
|
27
CALL
UnitedHealth
UNH
$396B
| $1.03B | 0.53% |
2,977,800
-501,500
| -14% | -$152M |
|
|
28
PUT
Broadcom
AVGO
$1.84T
| $1,000M | 0.51% |
3,045,700
-350,700
| -10% | -$108M |
|
29
PUT
Palantir
PLTR
$318B
| $950M | 0.49% |
5,230,100
-192,600
| -4% | -$31.2M |
|
|
30
CALL
Palantir
PLTR
$318B
| $906M | 0.46% |
4,966,600
-182,600
| -4% | -$29.6M |
|
|
31
CALL
Broadcom
AVGO
$1.84T
| $898M | 0.46% |
2,720,700
+487,200
| +22% | +$149M |
|
32
CALL
Advanced Micro Devices
AMD
$888B
| $887M | 0.46% |
5,481,800
-1,091,300
| -17% | -$176M |
|
33
CALL
Strategy Inc
MSTR
$37B
| $876M | 0.45% |
2,726,900
+213,400
| +8% | +$79.2M |
|
34
PUT
VanEck Gold Miners ETF
GDX
$22.7B
| $853M | 0.44% |
5,615,000
+810,600
| +17% | +$48.8M |
|
35
CALL
iShares Silver Trust
SLV
$28.4B
| $852M | 0.44% |
20,099,700
+4,527,400
| +29% | +$163M |
|
36
CALL
State Street Materials Select Sector SPDR ETF
XLB
$8.31B
| $840M | 0.43% |
20,128,600
-2,327,600
| -10% | -$105M |
|
37
CALL
Alibaba
BABA
$283B
| $816M | 0.42% |
4,944,800
+104,500
| +2% | +$13.7M |
|
|
38
CALL
Netflix
NFLX
$286B
| $792M | 0.41% |
6,609,000
-5,804,000
| -47% | -$708M |
|
|
39
CALL
VanEck Gold Miners ETF
GDX
$22.7B
| $744M | 0.38% |
5,165,000
+174,200
| +3% | +$10.5M |
|
|
40
PUT
Advanced Micro Devices
AMD
$888B
| $676M | 0.35% |
4,359,100
-516,700
| -11% | -$83.4M |
|
41
PUT
TSMC
TSM
$2.2T
| $675M | 0.35% |
2,417,100
-565,300
| -19% | -$138M |
|
42
CALL
Oracle
ORCL
$366B
| $670M | 0.34% |
2,383,100
+1,133,100
| +91% | +$289M |
|
|
43
PUT
iShares Bitcoin Trust
IBIT
$48.9B
| $667M | 0.34% |
10,259,900
+2,657,000
| +35% | +$173M |
|
|
44
PUT
UnitedHealth
UNH
$396B
| $606M | 0.31% |
1,754,200
+806,700
| +85% | +$244M |
|
45
CALL
Robinhood
HOOD
$95.5B
| $601M | 0.31% |
4,354,500
+197,300
| +5% | +$21.5M |
|
|
46
PUT
Oracle
ORCL
$366B
| $557M | 0.29% |
2,027,600
+830,000
| +69% | +$211M |
|
|
47
PUT
Alibaba
BABA
$283B
| $535M | 0.27% |
2,993,300
+656,300
| +28% | +$86M |
|
|
48
PUT
Robinhood
HOOD
$95.5B
| $482M | 0.25% |
3,365,900
+774,600
| +30% | +$84.5M |
|
49
CALL
Micron Technology
MU
$1.1T
| $481M | 0.25% |
2,873,200
+157,000
| +6% | +$20.1M |
|
50
CALL
Intel
INTC
$530B
| $463M | 0.24% |
13,800,000
+3,518,800
| +34% | +$85.3M |
|
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.