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 | |
|---|---|---|---|---|---|---|
3301
JPMorgan Nasdaq Equity Premium Income ETF
JEPQ
$39B
| $785K | ﹤0.01% |
+13,648
| New | +$758K |
|
|
ETOR
3302
eToro Group
ETOR
$3.01B
| $785K | ﹤0.01% |
19,042
-3,982
| -17% | -$205K |
|
3303
CALL
Argan
AGX
$7.61B
| $783K | ﹤0.01% |
2,900
-4,100
| -59% | -$940K |
|
|
NXDR
3304
CALL
Nextdoor Holdings
NXDR
$870M
| $783K | ﹤0.01% |
+374,700
| New | +$726K |
|
|
LX
3305
CALL
LexinFintech Holdings
LX
$241M
| $783K | ﹤0.01% |
147,000
-119,900
| -45% | -$766K |
|
3306
Oaktree Specialty Lending
OCSL
$1.04B
| $782K | ﹤0.01% |
+59,929
| New | +$825K |
|
3307
ProShares Ultra S&P500
SSO
$7.72B
| $780K | ﹤0.01% |
+13,928
| New | +$727K |
|
3308
Arthur J. Gallagher & Co
AJG
$65.1B
| $779K | ﹤0.01% |
+2,518
| New | +$759K |
|
3309
CALL
Compañía de Minas Buenaventura
BVN
$8.06B
| $778K | ﹤0.01% |
32,000
+31,700
| +10,567% | +$594K |
|
3310
PUT
Ero Copper
ERO
$2.73B
| $778K | ﹤0.01% |
38,500
+20,500
| +114% | +$312K |
|
3311
PUT
10x Genomics
TXG
$5.83B
| $777K | ﹤0.01% |
66,500
+100
| +0.2% | +$1.3K |
|
3312
ADMA Biologics
ADMA
$1.97B
| $774K | ﹤0.01% |
+52,851
| New | +$906K |
|
3313
PUT
Oxford Industries
OXM
$602M
| $774K | ﹤0.01% |
19,100
+10,000
| +110% | +$433K |
|
3314
CALL
Blue Owl Capital
OBDC
$5.42B
| $773K | ﹤0.01% |
60,600
+14,500
| +31% | +$206K |
|
3315
CALL
The Honest Company
HNST
$423M
| $772K | ﹤0.01% |
210,000
+190,300
| +966% | +$807K |
|
3316
CALL
Keros Therapeutics
KROS
$202M
| $772K | ﹤0.01% |
48,800
-98,300
| -67% | -$1.45M |
|
3317
Alliant Energy
LNT
$19.1B
| $772K | ﹤0.01% |
11,456
+10,325
| +913% | +$666K |
|
3318
PUT
Viper Energy
VNOM
$8.4B
| $772K | ﹤0.01% |
20,200
+10,500
| +108% | +$400K |
|
3319
CALL
MACOM Technology Solutions
MTSI
$20.1B
| $771K | ﹤0.01% |
6,200
-8,200
| -57% | -$1.08M |
|
3320
CALL
Main Street Capital
MAIN
$5B
| $769K | ﹤0.01% |
12,100
-2,800
| -19% | -$181K |
|
3321
Dine Brands
DIN
$448M
| $768K | ﹤0.01% |
31,094
+29,363
| +1,696% | +$688K |
|
3322
CALL
Ingersoll Rand
IR
$33.1B
| $768K | ﹤0.01% |
9,300
+2,300
| +33% | +$189K |
|
3323
PUT
Apple Hospitality REIT
APLE
$3.98B
| $765K | ﹤0.01% |
63,700
-12,400
| -16% | -$153K |
|
3324
Carpenter Technology
CRS
$28.8B
| $765K | ﹤0.01% |
3,116
+2,064
| +196% | +$528K |
|
|
UROY
3325
Uranium Royalty Corp
UROY
$402M
| $765K | ﹤0.01% |
177,969
+56,237
| +46% | +$170K |
|
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.