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 | |
|---|---|---|---|---|---|---|
7901
PUT
Novanta
NOVT
$5.04B
| $10K | ﹤0.01% |
+100
| New | +$11.9K |
|
7902
CALL
LiveRamp
RAMP
$2.29B
| $10K | ﹤0.01% |
400
+100
| +33% | +$2.95K |
|
7903
CALL
Red Violet
RDVT
$859M
| $10K | ﹤0.01% |
+200
| New | +$9.48K |
|
7904
PUT
Satellogic
SATL
$532M
| $10K | ﹤0.01% |
3,100
+900
| +41% | +$3.17K |
|
|
SEM
7905
DELISTED
Select Medical
SEM
| $10K | ﹤0.01% |
+849
| New | +$11.3K |
|
|
SEMR
7906
PUT
DELISTED
Semrush
SEMR
| $10K | ﹤0.01% |
+1,500
| New | +$12.2K |
|
7907
CALL
Superior Group of Companies
SGC
$193M
| $10K | ﹤0.01% |
1,000
+900
| +900% | +$10.3K |
|
7908
PUT
Surgery Partners
SGRY
$2.06B
| $10K | ﹤0.01% |
500
-10,600
| -95% | -$236K |
|
7909
SiriusPoint
SPNT
$2.98B
| $10K | ﹤0.01% |
+600
| New | +$11.2K |
|
7910
CALL
SPS Commerce
SPSC
$2.25B
| $10K | ﹤0.01% |
100
-900
| -90% | -$107K |
|
|
7911
PUT
SPS Commerce
SPSC
$2.25B
| $10K | ﹤0.01% |
+100
| New | +$11.9K |
|
7912
Sensus Healthcare
SRTS
$49.9M
| $10K | ﹤0.01% |
3,226
+1,316
| +69% | +$5.17K |
|
7913
PUT
Taboola.com
TBLA
$1.32B
| $10K | ﹤0.01% |
3,100
| – | – |
|
7914
Texas Capital Bancshares
TCBI
$4.31B
| $10K | ﹤0.01% |
+123
| New | +$10.5K |
|
|
TSE
7915
CALL
DELISTED
Trinseo
TSE
| $10K | ﹤0.01% |
4,400
-2,100
| -32% | -$5.46K |
|
7916
PUT
TTEC Holdings
TTEC
$103M
| $10K | ﹤0.01% |
3,200
+1,300
| +68% | +$5.33K |
|
7917
Ultrapar
UGP
$6.87B
| $10K | ﹤0.01% |
2,678
+2,257
| +536% | +$7.67K |
|
7918
Veeco
VECO
$3.15B
| $10K | ﹤0.01% |
+338
| New | +$8.05K |
|
7919
CALL
Veralto
VLTO
$22.6B
| $10K | ﹤0.01% |
100
-400
| -80% | -$42.2K |
|
|
7920
PUT
Veralto
VLTO
$22.6B
| $10K | ﹤0.01% |
100
-500
| -83% | -$52.8K |
|
|
VZLA
7921
CALL
Vizsla Silver
VZLA
$1.16B
| $10K | ﹤0.01% |
+2,500
| New | +$8.67K |
|
7922
West Fraser Timber
WFG
$5.18B
| $10K | ﹤0.01% |
+150
| New | +$10.9K |
|
|
CTNM
7923
Contineum Therapeutics
CTNM
$526M
| $10K | ﹤0.01% |
+895
| New | +$7.21K |
|
7924
Lionsgate Studios
LION
$3.88B
| $10K | ﹤0.01% |
1,480
+797
| +117% | +$5.13K |
|
|
INVX
7925
Innovex International
INVX
$1.87B
| $10K | ﹤0.01% |
554
-1,552
| -74% | -$25.8K |
|
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.