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 | |
|---|---|---|---|---|---|---|
7001
PUT
ProFrac Holding
ACDC
$653M
| $29K | ﹤0.01% |
8,000
+5,700
| +248% | +$31.4K |
|
7002
CALL
Beam Global
BEEM
$21.4M
| $29K | ﹤0.01% |
10,100
+8,100
| +405% | +$19.6K |
|
|
BLDP
7003
PUT
Ballard Power Systems
BLDP
$790M
| $29K | ﹤0.01% |
+10,900
| New | +$22.3K |
|
7004
PUT
Chefs' Warehouse
CHEF
$4.55B
| $29K | ﹤0.01% |
500
-200
| -29% | -$12.7K |
|
7005
Celldex Therapeutics
CLDX
$2.85B
| $29K | ﹤0.01% |
1,136
-27,135
| -96% | -$629K |
|
7006
PUT
Dycom Industries
DY
$11.3B
| $29K | ﹤0.01% |
100
-2,900
| -97% | -$761K |
|
7007
CALL
Glacier Bancorp
GBCI
$6.39B
| $29K | ﹤0.01% |
600
+200
| +50% | +$9.38K |
|
|
TDAY
7008
CALL
USA Today Co
TDAY
$1.3B
| $29K | ﹤0.01% |
7,100
-31,300
| -82% | -$126K |
|
7009
CALL
Information Services Group
III
$205M
| $29K | ﹤0.01% |
5,200
+1,900
| +58% | +$9.45K |
|
7010
PUT
MediaAlpha
MAX
$753M
| $29K | ﹤0.01% |
2,600
| – | – |
|
7011
CALL
Mercer International
MERC
$42.2M
| $29K | ﹤0.01% |
10,200
+3,200
| +46% | +$10.6K |
|
7012
Otter Tail
OTTR
$3.86B
| $29K | ﹤0.01% |
+356
| New | +$28.9K |
|
7013
PUT
Payoneer
PAYO
$2.42B
| $29K | ﹤0.01% |
4,900
+400
| +9% | +$2.68K |
|
|
IFLN
7014
Invesco Bloomberg Enhanced Fallen Angels ETF
IFLN
$308M
| $29K | ﹤0.01% |
1,580
-1,928
| -55% | -$35.6K |
|
7015
PMV Pharmaceuticals
PMVP
$58.1M
| $29K | ﹤0.01% |
20,741
+20,670
| +29,113% | +$28.6K |
|
7016
CALL
Spero Therapeutics
SPRO
$68.3M
| $29K | ﹤0.01% |
15,900
-26,900
| -63% | -$59.1K |
|
7017
Shutterstock
SSTK
$210M
| $29K | ﹤0.01% |
+1,412
| New | +$28.8K |
|
7018
PUT
STAAR Surgical
STAA
$1.2B
| $29K | ﹤0.01% |
1,100
-1,500
| -58% | -$35.8K |
|
7019
CALL
Virco
VIRC
$94.1M
| $29K | ﹤0.01% |
+3,800
| New | +$30.9K |
|
7020
PUT
Willdan Group
WLDN
$1.03B
| $29K | ﹤0.01% |
300
+200
| +200% | +$18.9K |
|
|
TECX
7021
CALL
Tectonic Therapeutic
TECX
$531M
| $29K | ﹤0.01% |
1,900
+400
| +27% | +$8.26K |
|
|
MVLL
7022
GraniteShares 2x Long MRVL Daily ETF
MVLL
$177M
| $29K | ﹤0.01% |
+3,780
| New | +$24.9K |
|
|
AHRT
7023
PUT
AH Realty Trust
AHRT
$540M
| $28K | ﹤0.01% |
4,100
-24,600
| -86% | -$174K |
|
7024
Allison Transmission
ALSN
$9.55B
| $28K | ﹤0.01% |
+338
| New | +$30.1K |
|
7025
CALL
Ashland
ASH
$3.42B
| $28K | ﹤0.01% |
600
-1,100
| -65% | -$57.8K |
|
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.