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 | |
|---|---|---|---|---|---|---|
6751
PUT
Perdoceo Education
PRDO
$2.17B
| $37K | ﹤0.01% |
1,000
-700
| -41% | -$22.4K |
|
6752
CALL
Personalis
PSNL
$1.25B
| $37K | ﹤0.01% |
5,800
-15,100
| -72% | -$85.9K |
|
6753
PUT
Sprott Junior Gold Miners ETF
SGDJ
$268M
| $37K | ﹤0.01% |
600
+100
| +20% | +$5.63K |
|
6754
CALL
Tenable Holdings
TENB
$3.47B
| $37K | ﹤0.01% |
1,300
-3,500
| -73% | -$109K |
|
6755
CALL
Veracyte
VCYT
$4.45B
| $37K | ﹤0.01% |
1,100
-100
| -8% | -$2.87K |
|
6756
Veru
VERU
$35.5M
| $37K | ﹤0.01% |
+9,924
| New | +$42.9K |
|
6757
CALL
BBB Foods
TBBB
$4.76B
| $37K | ﹤0.01% |
1,400
+300
| +27% | +$7.8K |
|
|
CTEV
6758
PUT
Claritev Corp
CTEV
$399M
| $37K | ﹤0.01% |
700
-2,600
| -79% | -$143K |
|
|
CRCG
6759
Leverage Shares 2X Long CRCL Daily ETF
CRCG
$78.9M
| $37K | ﹤0.01% |
+403
| New | +$39.8K |
|
6760
ArcBest
ARCB
$3.15B
| $36K | ﹤0.01% |
+521
| New | +$39.2K |
|
6761
CALL
Arrow Electronics
ARW
$10.5B
| $36K | ﹤0.01% |
+300
| New | +$37.7K |
|
6762
PUT
Clarus
CLAR
$125M
| $36K | ﹤0.01% |
10,300
+7,800
| +312% | +$28.2K |
|
|
CVGW
6763
CALL
DELISTED
Calavo Growers
CVGW
| $36K | ﹤0.01% |
+1,400
| New | +$37.8K |
|
6764
VanEck Digital Transformation ETF
DAPP
$217M
| $36K | ﹤0.01% |
1,677
+317
| +23% | +$5.81K |
|
|
FPI
6765
CALL
Farmland Partners
FPI
$415M
| $36K | ﹤0.01% |
3,400
-13,600
| -80% | -$149K |
|
6766
CALL
Helios Technologies
HLIO
$2.47B
| $36K | ﹤0.01% |
+700
| New | +$32.7K |
|
|
6767
PUT
Helios Technologies
HLIO
$2.47B
| $36K | ﹤0.01% |
+700
| New | +$32.7K |
|
|
HPP
6768
CALL
Hudson Pacific Properties
HPP
$758M
| $36K | ﹤0.01% |
1,900
-5,000
| -72% | -$94.3K |
|
6769
CALL
IBEX
IBEX
$489M
| $36K | ﹤0.01% |
+900
| New | +$28.6K |
|
6770
PUT
INmune Bio
INMB
$44.9M
| $36K | ﹤0.01% |
17,800
-249,100
| -93% | -$570K |
|
6771
KBR
KBR
$4.56B
| $36K | ﹤0.01% |
+765
| New | +$37.1K |
|
|
KW
6772
DELISTED
Kennedy-Wilson Holdings
KW
| $36K | ﹤0.01% |
4,410
-1,581
| -26% | -$12.7K |
|
|
LTC
6773
PUT
LTC Properties
LTC
$2.13B
| $36K | ﹤0.01% |
1,000
-14,200
| -93% | -$507K |
|
6774
CALL
Miller Industries
MLR
$577M
| $36K | ﹤0.01% |
900
+800
| +800% | +$33.7K |
|
6775
PUT
Envista
NVST
$4.62B
| $36K | ﹤0.01% |
1,800
-200
| -10% | -$4.11K |
|
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.