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 | |
|---|---|---|---|---|---|---|
4726
EyePoint Inc
EYPT
$999M
| $238K | ﹤0.01% |
16,741
+14,597
| +681% | +$168K |
|
4727
PUT
Vicor
VICR
$8.33B
| $238K | ﹤0.01% |
4,800
-9,700
| -67% | -$472K |
|
|
HTGCR
4728
CALL
DELISTED
HERCULES TECHNOLOGY GROWTH CAP INC TRANS RGTS TO PUR COM STK
HTGCR
| $238K | ﹤0.01% |
12,600
-13,000
| -51% | -$246K |
|
|
CNTA
4729
CALL
DELISTED
Centessa Pharmaceuticals
CNTA
| $237K | ﹤0.01% |
9,800
+4,600
| +88% | +$81.8K |
|
4730
PUT
Otis Worldwide
OTIS
$27.9B
| $237K | ﹤0.01% |
2,600
-28,800
| -92% | -$2.61M |
|
|
PPL
4731
PPL Corp
PPL
$26.9B
| $237K | ﹤0.01% |
+6,385
| New | +$229K |
|
|
TE
4732
CALL
T1 Energy
TE
$1.04B
| $237K | ﹤0.01% |
109,000
+34,000
| +45% | +$54.2K |
|
|
BLDP
4733
CALL
Ballard Power Systems
BLDP
$754M
| $236K | ﹤0.01% |
+86,800
| New | +$178K |
|
4734
PUT
Green Brick Partners
GRBK
$3.09B
| $236K | ﹤0.01% |
3,200
+900
| +39% | +$61.5K |
|
4735
CALL
Kiniksa Pharmaceuticals
KNSA
$6.31B
| $236K | ﹤0.01% |
6,100
+3,800
| +165% | +$123K |
|
4736
PUT
POET Technologies
POET
$1.1B
| $236K | ﹤0.01% |
42,700
-48,400
| -53% | -$273K |
|
4737
PUT
Rimini Street
RMNI
$457M
| $236K | ﹤0.01% |
+50,500
| New | +$224K |
|
4738
PUT
Aegon
AEG
$13.3B
| $235K | ﹤0.01% |
29,500
-2,600
| -8% | -$19.4K |
|
|
GOLD
4739
CALL
Gold.com Inc
GOLD
$1.16B
| $235K | ﹤0.01% |
9,100
-3,700
| -29% | -$87.5K |
|
4740
Diageo
DEO
$49.6B
| $235K | ﹤0.01% |
2,465
+1,972
| +400% | +$207K |
|
|
FINV
4741
PUT
FinVolution Group
FINV
$1.17B
| $235K | ﹤0.01% |
32,000
-45,200
| -59% | -$396K |
|
|
MOMO
4742
CALL
Hello Group
MOMO
$867M
| $235K | ﹤0.01% |
31,700
-81,500
| -72% | -$666K |
|
4743
PUT
Absci
ABSI
$1.17B
| $234K | ﹤0.01% |
77,300
-20,100
| -21% | -$55.6K |
|
|
CMPS
4744
CALL
Compass Pathways
CMPS
$1.47B
| $234K | ﹤0.01% |
41,000
-84,800
| -67% | -$381K |
|
4745
CALL
Kenon Holdings
KEN
$3.33B
| $234K | ﹤0.01% |
5,200
+2,400
| +86% | +$108K |
|
4746
Phathom Pharmaceuticals
PHAT
$928M
| $234K | ﹤0.01% |
+19,960
| New | +$206K |
|
4747
PUT
CVR Partners
UAN
$1.3B
| $234K | ﹤0.01% |
2,600
+1,900
| +271% | +$171K |
|
4748
W.R. Berkley
WRB
$28.1B
| $234K | ﹤0.01% |
+3,060
| New | +$218K |
|
4749
CALL
Designer Brands
DBI
$315M
| $233K | ﹤0.01% |
65,900
+17,400
| +36% | +$60K |
|
4750
CALL
Energizer
ENR
$1.47B
| $233K | ﹤0.01% |
9,400
+3,900
| +71% | +$102K |
|
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.