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 | |
|---|---|---|---|---|---|---|
3001
CALL
Birkenstock
BIRK
$7.64B
| $1.04M | ﹤0.01% |
23,000
+21,300
| +1,253% | +$1.04M |
|
|
IRBT
3002
CALL
DELISTED
iRobot
IRBT
| $1.04M | ﹤0.01% |
289,800
+80,100
| +38% | +$310K |
|
3003
CALL
Pinnacle West Capital
PNW
$12.8B
| $1.04M | ﹤0.01% |
11,600
+10,300
| +792% | +$927K |
|
3004
CALL
Rapid7
RPD
$643M
| $1.04M | ﹤0.01% |
55,500
+16,400
| +42% | +$346K |
|
3005
PUT
Fiverr
FVRR
$398M
| $1.04M | ﹤0.01% |
42,600
+25,400
| +148% | +$622K |
|
3006
PUT
International Paper
IP
$22.5B
| $1.04M | ﹤0.01% |
22,400
-61,500
| -73% | -$3M |
|
|
SGI
3007
Somnigroup International
SGI
$15.3B
| $1.04M | ﹤0.01% |
+12,314
| New | +$970K |
|
3008
CALL
Charles River Laboratories
CRL
$10.8B
| $1.03M | ﹤0.01% |
6,600
-900
| -12% | -$143K |
|
3009
CALL
Fortune Brands Innovations
FBIN
$6.14B
| $1.03M | ﹤0.01% |
19,300
+19,200
| +19,200% | +$1.08M |
|
3010
CALL
Banco Bilbao Vizcaya Argentaria
BBVA
$147B
| $1.03M | ﹤0.01% |
53,500
+11,800
| +28% | +$206K |
|
3011
CALL
New Oriental
EDU
$7.94B
| $1.03M | ﹤0.01% |
19,400
-400
| -2% | -$19.7K |
|
3012
CALL
Microvision
MVIS
$88.8M
| $1.03M | ﹤0.01% |
830,300
+187,500
| +29% | +$223K |
|
|
CNH
3013
CALL
CNH Industrial
CNH
$13.7B
| $1.03M | ﹤0.01% |
94,900
-1,000
| -1% | -$12.2K |
|
3014
Church & Dwight Co
CHD
$23.4B
| $1.03M | ﹤0.01% |
11,737
+2,129
| +22% | +$200K |
|
3015
CALL
Medpace
MEDP
$16.5B
| $1.03M | ﹤0.01% |
2,000
+1,800
| +900% | +$786K |
|
3016
CALL
Dorchester Minerals
DMLP
$1.31B
| $1.03M | ﹤0.01% |
39,700
+15,100
| +61% | +$394K |
|
3017
Ramaco Resources Class A
METC
$664M
| $1.03M | ﹤0.01% |
30,951
-117,680
| -79% | -$2.74M |
|
3018
PUT
New York Times
NYT
$11.7B
| $1.03M | ﹤0.01% |
17,900
-19,200
| -52% | -$1.1M |
|
3019
Direxion Daily GOOGL Bull 2X ETF
GGLL
$836M
| $1.02M | ﹤0.01% |
+16,240
| New | +$790K |
|
3020
CALL
FIGS
FIGS
$1.66B
| $1.02M | ﹤0.01% |
153,000
-297,400
| -66% | -$1.96M |
|
|
SAND
3021
CALL
DELISTED
Sandstorm Gold
SAND
| $1.02M | ﹤0.01% |
200,900
-182,200
| -48% | -$1.94M |
|
|
PEW
3022
CALL
GrabAGun Digital Holdings
PEW
$75M
| $1.02M | ﹤0.01% |
+219,400
| New | +$1.37M |
|
3023
PUT
Harrow
HROW
$1.4B
| $1.02M | ﹤0.01% |
21,200
+1,100
| +5% | +$41.4K |
|
3024
PUT
Valley National Bancorp
VLY
$7.94B
| $1.02M | ﹤0.01% |
96,400
+59,100
| +158% | +$590K |
|
|
SGI
3025
CALL
Somnigroup International
SGI
$15.3B
| $1.02M | ﹤0.01% |
12,100
-17,100
| -59% | -$1.35M |
|
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.