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 | |
|---|---|---|---|---|---|---|
|
PR
1401
CALL
Permian Resources
PR
$17.9B
| $5.36M | ﹤0.01% |
418,500
+100,200
| +31% | +$1.37M |
|
1402
PUT
Steel Dynamics
STLD
$35.6B
| $5.35M | ﹤0.01% |
38,400
-13,700
| -26% | -$1.8M |
|
1403
CALL
YPF
YPF
$20.2B
| $5.35M | ﹤0.01% |
220,300
+84,000
| +62% | +$2.58M |
|
|
GEMI
1404
CALL
Gemini Space Station
GEMI
$542M
| $5.35M | ﹤0.01% |
+223,300
| New | +$5.76M |
|
1405
CALL
State Street
STT
$50.9B
| $5.35M | ﹤0.01% |
46,100
-15,900
| -26% | -$1.77M |
|
1406
CALL
Tencent Music
TME
$14.5B
| $5.34M | ﹤0.01% |
228,700
-114,600
| -33% | -$2.66M |
|
1407
CALL
Signet Jewelers
SIG
$3.55B
| $5.32M | ﹤0.01% |
55,500
+26,300
| +90% | +$2.25M |
|
1408
First Majestic Silver
AG
$8.05B
| $5.32M | ﹤0.01% |
433,038
+398,931
| +1,170% | +$3.7M |
|
1409
CALL
Norfolk Southern
NSC
$78.8B
| $5.32M | ﹤0.01% |
17,700
-3,700
| -17% | -$1.03M |
|
1410
PUT
CoStar Group
CSGP
$11.3B
| $5.32M | ﹤0.01% |
63,000
-25,100
| -28% | -$2.22M |
|
1411
PUT
Monster Beverage
MNST
$91.4B
| $5.31M | ﹤0.01% |
78,900
-51,700
| -40% | -$3.23M |
|
1412
PUT
Cenovus Energy
CVE
$54.6B
| $5.3M | ﹤0.01% |
312,300
-10,800
| -3% | -$169K |
|
|
EXK
1413
CALL
Endeavour Silver
EXK
$2.32B
| $5.3M | ﹤0.01% |
676,700
+392,600
| +138% | +$2.32M |
|
1414
PUT
UGI
UGI
$8B
| $5.29M | ﹤0.01% |
158,900
+2,200
| +1% | +$76.9K |
|
1415
PUT
Transmedics
TMDX
$2.5B
| $5.28M | ﹤0.01% |
47,100
-1,600
| -3% | -$187K |
|
1416
CALL
ClearShares Piton Intermediate Fixed Income ETF
PIFI
$97.5M
| $5.28M | ﹤0.01% |
128,000
-118,500
| -48% | -$11.3M |
|
1417
PUT
Cboe Global Markets
CBOE
$29.8B
| $5.27M | ﹤0.01% |
21,500
+11,400
| +113% | +$2.74M |
|
1418
XPeng
XPEV
$11.8B
| $5.27M | ﹤0.01% |
224,967
-21,154
| -9% | -$425K |
|
1419
CALL
Guardant Health
GH
$19.5B
| $5.25M | ﹤0.01% |
84,100
-2,600
| -3% | -$141K |
|
1420
PUT
Celanese
CE
$5.09B
| $5.24M | ﹤0.01% |
124,600
+39,600
| +47% | +$1.97M |
|
1421
CSX Corp
CSX
$98.6B
| $5.24M | ﹤0.01% |
+147,475
| New | +$5.04M |
|
1422
CALL
Groupon
GRPN
$980M
| $5.22M | ﹤0.01% |
223,800
-78,500
| -26% | -$2.26M |
|
1423
PUT
Vipshop
VIPS
$6.84B
| $5.22M | ﹤0.01% |
265,900
+87,400
| +49% | +$1.45M |
|
1424
CALL
Tower Semiconductor
TSEM
$26.4B
| $5.21M | ﹤0.01% |
72,100
+51,800
| +255% | +$2.83M |
|
1425
Cloudflare
NET
$93B
| $5.21M | ﹤0.01% |
24,256
-13,979
| -37% | -$2.85M |
|
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.