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 | |
|---|---|---|---|---|---|---|
426
PUT
Apollo Global Management
APO
$68.6B
| $37.9M | 0.02% |
284,500
+2,100
| +0.7% | +$297K |
|
427
CALL
Humana
HUM
$47.7B
| $37.8M | 0.02% |
145,100
+60,900
| +72% | +$16M |
|
428
CALL
iShares Gold Trust
IAU
$64.2B
| $37.7M | 0.02% |
517,700
+326,100
| +170% | +$21.3M |
|
429
PUT
Southwest Airlines
LUV
$23.3B
| $37.7M | 0.02% |
1,180,600
+96,300
| +9% | +$3.15M |
|
430
CALL
Union Pacific
UNP
$174B
| $37.5M | 0.02% |
158,500
+21,100
| +15% | +$4.76M |
|
431
Nike
NKE
$62.6B
| $37.4M | 0.02% |
536,292
+13,500
| +3% | +$1.01M |
|
432
PUT
Thermo Fisher Scientific
TMO
$196B
| $37.3M | 0.02% |
76,900
+7,800
| +11% | +$3.63M |
|
433
CALL
Trump Media & Technology Group
DJT
$2.56B
| $36.9M | 0.02% |
2,249,700
+958,800
| +74% | +$17M |
|
434
CALL
QuantumScape Corp
QS
$3.61B
| $36.9M | 0.02% |
2,996,800
+1,684,900
| +128% | +$16.4M |
|
435
CALL
Applied Digital
APLD
$8.6B
| $36.9M | 0.02% |
1,829,300
+391,900
| +27% | +$5.8M |
|
436
PUT
Verizon
VZ
$185B
| $36.5M | 0.02% |
830,900
-1,689,700
| -67% | -$73.1M |
|
437
PUT
Rocket Companies
RKT
$38B
| $36.5M | 0.02% |
1,881,900
+1,369,400
| +267% | +$23.9M |
|
438
CALL
Wynn Resorts
WYNN
$9.79B
| $36.4M | 0.02% |
284,100
+138,600
| +95% | +$16M |
|
439
CALL
Cloudflare
NET
$95.5B
| $36.4M | 0.02% |
169,500
-29,100
| -15% | -$5.94M |
|
440
PUT
Invesco S&P SmallCap Low Volatility ETF
XSLV
$247M
| $36.1M | 0.02% |
462,000
+28,400
| +7% | +$1.32M |
|
441
PUT
Cameco
CCJ
$39.4B
| $36M | 0.02% |
428,800
-72,200
| -14% | -$5.6M |
|
442
CALL
Zoom
ZM
$25.2B
| $35.7M | 0.02% |
432,600
+184,300
| +74% | +$14.4M |
|
443
CALL
Avis
CAR
$5.81B
| $35.7M | 0.02% |
222,100
-9,300
| -4% | -$1.57M |
|
444
PUT
PG&E
PCG
$39.9B
| $35.6M | 0.02% |
2,360,500
-133,200
| -5% | -$1.94M |
|
445
CALL
Analog Devices
ADI
$188B
| $35.4M | 0.02% |
144,200
-17,600
| -11% | -$4.23M |
|
446
CALL
Globalstar
GSAT
$10.3B
| $35.4M | 0.02% |
972,900
-304,600
| -24% | -$8.73M |
|
447
PUT
Lyft
LYFT
$5.57B
| $34.9M | 0.02% |
1,587,000
-102,300
| -6% | -$1.71M |
|
448
PUT
Intuitive Surgical
ISRG
$121B
| $34.7M | 0.02% |
77,700
+15,200
| +24% | +$7.29M |
|
449
PUT
ConocoPhillips
COP
$145B
| $34.7M | 0.02% |
367,300
-67,000
| -15% | -$6.33M |
|
|
CFLT
450
CALL
DELISTED
Confluent
CFLT
| $34.7M | 0.02% |
1,753,600
+1,266,700
| +260% | +$26.5M |
|
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.