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 | |
|---|---|---|---|---|---|---|
1526
CALL
Campbell Soup
CPB
$6.51B
| $4.64M | ﹤0.01% |
147,100
+66,900
| +83% | +$2.16M |
|
1527
Lyft
LYFT
$5.39B
| $4.64M | ﹤0.01% |
211,048
-89,840
| -30% | -$1.5M |
|
1528
CALL
Box
BOX
$4.02B
| $4.64M | ﹤0.01% |
143,800
+65,600
| +84% | +$2.12M |
|
1529
CALL
Powell Industries
POWL
$8.46B
| $4.63M | ﹤0.01% |
45,600
-15,000
| -25% | -$1.27M |
|
1530
CALL
SkyWater Technology
SKYT
$1.51B
| $4.63M | ﹤0.01% |
248,300
+207,500
| +509% | +$2.4M |
|
1531
CALL
Alignment Healthcare
ALHC
$4.02B
| $4.63M | ﹤0.01% |
265,100
+213,100
| +410% | +$3.16M |
|
1532
PUT
Ambarella
AMBA
$2.99B
| $4.62M | ﹤0.01% |
56,000
+35,700
| +176% | +$2.59M |
|
1533
CALL
Genuine Parts
GPC
$17.1B
| $4.62M | ﹤0.01% |
33,300
-37,400
| -53% | -$5.02M |
|
1534
CALL
Diageo
DEO
$46.2B
| $4.61M | ﹤0.01% |
48,300
+33,100
| +218% | +$3.47M |
|
1535
PUT
Intuitive Machines
LUNR
$2.07B
| $4.61M | ﹤0.01% |
438,200
+205,700
| +88% | +$2.09M |
|
1536
DraftKings
DKNG
$11.4B
| $4.6M | ﹤0.01% |
123,107
-9,941
| -7% | -$441K |
|
1537
iPath Series B S&P 500 VIX Short-Term Futures ETN
VXX
$162M
| $4.6M | ﹤0.01% |
138,761
+117,520
| +553% | +$4.65M |
|
1538
ProShares UltraPro Short QQQ
SQQQ
$2.21B
| $4.59M | ﹤0.01% |
+60,298
| New | +$5.34M |
|
1539
CALL
Intellia Therapeutics
NTLA
$1.5B
| $4.59M | ﹤0.01% |
265,800
+137,200
| +107% | +$1.69M |
|
1540
CALL
Teladoc Health
TDOC
$1.58B
| $4.59M | ﹤0.01% |
593,500
+341,700
| +136% | +$2.67M |
|
1541
PUT
Universal Health Services
UHS
$9.43B
| $4.58M | ﹤0.01% |
22,400
-1,300
| -5% | -$234K |
|
1542
Snowflake
SNOW
$92.9B
| $4.58M | ﹤0.01% |
+20,298
| New | +$4.36M |
|
1543
Global X Defense Tech ETF
SHLD
$7.07B
| $4.58M | ﹤0.01% |
65,169
+39,936
| +158% | +$2.51M |
|
1544
PUT
Lemonade
LMND
$4.62B
| $4.58M | ﹤0.01% |
85,500
+33,300
| +64% | +$1.62M |
|
1545
PUT
argenx
ARGX
$57.4B
| $4.57M | ﹤0.01% |
6,200
+1,400
| +29% | +$923K |
|
1546
PUT
TripAdvisor
TRIP
$1.59B
| $4.57M | ﹤0.01% |
280,900
+235,100
| +513% | +$4.1M |
|
1547
AstraZeneca
AZN
$263B
| $4.56M | ﹤0.01% |
29,742
-20,905
| -41% | -$3.16M |
|
1548
CALL
Shoals Technologies Group
SHLS
$1.58B
| $4.56M | ﹤0.01% |
615,800
+577,100
| +1,491% | +$3.55M |
|
1549
PUT
Main Street Capital
MAIN
$4.97B
| $4.56M | ﹤0.01% |
71,700
+29,900
| +72% | +$1.93M |
|
1550
PUT
Roivant Sciences
ROIV
$25.2B
| $4.55M | ﹤0.01% |
301,000
+171,800
| +133% | +$2.13M |
|
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.