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 | |
|---|---|---|---|---|---|---|
2701
CALL
CorMedix
CRMD
$617M
| $1.39M | ﹤0.01% |
119,900
+6,200
| +5% | +$75K |
|
2702
National Vision
EYE
$1.6B
| $1.39M | ﹤0.01% |
47,774
+18,338
| +62% | +$450K |
|
2703
CALL
NovoCure
NVCR
$2.04B
| $1.39M | ﹤0.01% |
107,900
+27,600
| +34% | +$369K |
|
2704
CALL
Honda
HMC
$36.5B
| $1.39M | ﹤0.01% |
45,200
-182,200
| -80% | -$5.94M |
|
|
CIM
2705
PUT
Chimera Investment
CIM
$1.05B
| $1.39M | ﹤0.01% |
105,200
+3,800
| +4% | +$52.9K |
|
2706
CALL
ALPS REIT Dividend Dogs ETF
RDOG
$11.6M
| $1.38M | ﹤0.01% |
29,500
-65,600
| -69% | -$2.4M |
|
|
NB
2707
CALL
NioCorp Developments
NB
$603M
| $1.38M | ﹤0.01% |
207,000
+134,900
| +187% | +$569K |
|
2708
CALL
Chord Energy
CHRD
$7.79B
| $1.38M | ﹤0.01% |
13,900
+9,300
| +202% | +$978K |
|
2709
PUT
Elbit Systems
ESLT
$38.4B
| $1.38M | ﹤0.01% |
2,700
+2,200
| +440% | +$1.03M |
|
|
VSXY
2710
CALL
Victoria's Secret
VSXY
$6.64B
| $1.38M | ﹤0.01% |
50,700
-93,800
| -65% | -$2.11M |
|
2711
CALL
HealthEquity
HQY
$7.91B
| $1.37M | ﹤0.01% |
14,500
+5,100
| +54% | +$480K |
|
|
VSXY
2712
Victoria's Secret
VSXY
$6.64B
| $1.37M | ﹤0.01% |
50,625
-25,400
| -33% | -$571K |
|
2713
CALL
Equity Residential
EQR
$25.4B
| $1.37M | ﹤0.01% |
21,200
| – | – |
|
2714
Full Truck Alliance
YMM
$9.56B
| $1.37M | ﹤0.01% |
105,850
+45,063
| +74% | +$558K |
|
|
RZLV
2715
PUT
Rezolve AI
RZLV
$893M
| $1.37M | ﹤0.01% |
275,700
+251,200
| +1,025% | +$989K |
|
2716
PUT
Cheesecake Factory
CAKE
$4.21B
| $1.37M | ﹤0.01% |
25,100
+14,500
| +137% | +$888K |
|
2717
CALL
Goodyear
GT
$2.07B
| $1.37M | ﹤0.01% |
183,400
-19,200
| -9% | -$180K |
|
2718
CALL
Ventas
VTR
$48.9B
| $1.37M | ﹤0.01% |
19,600
+8,500
| +77% | +$571K |
|
2719
iShares MSCI United Kingdom ETF
EWU
$4.04B
| $1.37M | ﹤0.01% |
32,658
-2,611
| -7% | -$107K |
|
2720
CALL
Zimmer Biomet
ZBH
$17.7B
| $1.37M | ﹤0.01% |
13,900
-3,100
| -18% | -$307K |
|
2721
PUT
Alamos Gold
AGI
$12.4B
| $1.37M | ﹤0.01% |
39,200
-7,400
| -16% | -$212K |
|
2722
CALL
Ericsson
ERIC
$30.7B
| $1.36M | ﹤0.01% |
165,100
+8,800
| +6% | +$68.8K |
|
2723
Zoetis
ZTS
$31.6B
| $1.36M | ﹤0.01% |
+9,329
| New | +$1.41M |
|
2724
CALL
Yext
YEXT
$501M
| $1.36M | ﹤0.01% |
160,100
+120,900
| +308% | +$1.03M |
|
2725
CALL
Wendy's
WEN
$1.33B
| $1.36M | ﹤0.01% |
148,900
-109,800
| -42% | -$1.13M |
|
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.